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1

System and method for characterizing, synthesizing, and/or canceling out acoustic signals from inanimate sound sources  

DOE Patents (OSTI)

A system and method for characterizing, synthesizing, and/or canceling out acoustic signals from inanimate sound sources is disclosed. Propagating wave electromagnetic sensors monitor excitation sources in sound producing systems, such as machines, musical instruments, and various other structures. Acoustical output from these sound producing systems is also monitored. From such information, a transfer function characterizing the sound producing system is generated. From the transfer function, acoustical output from the sound producing system may be synthesized or canceled. The methods disclosed enable accurate calculation of matched transfer functions relating specific excitations to specific acoustical outputs. Knowledge of such signals and functions can be used to effect various sound replication, sound source identification, and sound cancellation applications.

Holzrichter, John F. (Berkeley, CA); Burnett, Greg C. (Livermore, CA); Ng, Lawrence C. (Danville, CA)

2007-10-16T23:59:59.000Z

2

Visualization of the sound field generated by a plate?cavity coupled system using acoustic holography  

Science Journals Connector (OSTI)

In most cases of structural?acoustic problems it is reasonable to assume that structural vibration is not influenced by the surrounding fluid. In these cases the vibration of the structure is solved first then the radiation sound field is calculated by simply applying the Kirchhoff–Helmholtz integral equation. However this assumption is no longer satisfied when structural stiffness is small or fluid impedance is comparable to it. In this situation the vibration and acoustic fields are to be solved simultaneously. Although many researchers have studied this structural?acoustic coupling problem there are still difficulties in solving the problem analytically or even numerically. In this study visualization of sound field by a geometrically simple system (plate?cavity coupled system) is performed experimentally in order to figure out the coupling mechanism between fluid and structure. The system is excited by a speaker and both internal and external sound pressures are measured. The acoustic holographic method is used to estimate the sound field. The results exhibit that there are frequencies where both plate and cavity are strongly coupled as well as ones where the plate can be considered rigid. Visualization that shows acoustic power flow between the internal cavity and external field enables us to understand the fluid?structure coupling mechanism.

Sea?Moon Kim; Yang?Hann Kim

1998-01-01T23:59:59.000Z

3

Spring 2011 ME706 Acoustics and Aerodynamic Sound ME706 Acoustics and Aerodynamic Sound  

E-Print Network (OSTI)

Spring 2011 ME706 Acoustics and Aerodynamic Sound ME706 Acoustics and Aerodynamic Sound Instructor-surface interaction. Spring 2011 1 ME706 Acoustics and Aerodynamic Sound #12;Spring 2011 ME706 Acoustics and Aerodynamic Sound Students are expected to: · Exhibit a level of mathematical maturity roughly equivalent

4

Generation of Sound Bullets with a Nonlinear Acoustic Lens  

E-Print Network (OSTI)

Acoustic lenses are employed in a variety of applications, from biomedical imaging and surgery, to defense systems, but their performance is limited by their linear operational envelope and complexity. Here we show a dramatic focusing effect and the generation of large amplitude, compact acoustic pulses (sound bullets) in solid and fluid media, enabled by a tunable, highly nonlinear acoustic lens. The lens consists of ordered arrays of granular chains. The amplitude, size and location of the sound bullets can be controlled by varying static pre-compression on the chains. We support our findings with theory, numerical simulations, and corroborate the results experimentally with photoelasticity measurements. Our nonlinear lens makes possible a qualitatively new way of generating high-energy acoustic pulses, enabling, for example, surgical control of acoustic energy.

Alessandro Spadoni; Chiara Daraio

2009-08-31T23:59:59.000Z

5

Sound Science: Taking Action with Acoustics  

ScienceCinema (OSTI)

From tin whistles to sonic booms, sound waves interact with each other and with the medium through which they travel. By observing these interactions, we can identify substances that are hidden in sealed containers and obtain images of buried objects. By manipulating the ability of sound to push matter around, we can create novel structures and unique materials. Join the Lab's own sound hound, Dipen Sinha, as he describes how he uses fundamental research in acoustics for solving problems in industry, security and health.

Sinha, Dipen

2014-07-21T23:59:59.000Z

6

Product sound: Acoustically pleasant motor drives  

E-Print Network (OSTI)

the framework of the Danish PhD Research school EnergyLab DK. The project is entitled Project sound noise generated by electrical mo- tors driven by a pulse width modulated (PWM) power electronic inverter analytical solution is proposed. The proposed unified analytical solution can be used for most of the carrier

Mathe, Laszlo

7

Study of the Acoustic Effects of Hydrokinetic Tidal Turbines in Admiralty Inlet, Puget Sound  

SciTech Connect

Hydrokinetic turbines will be a source of noise in the marine environment - both during operation and during installation/removal. High intensity sound can cause injury or behavioral changes in marine mammals and may also affect fish and invertebrates. These noise effects are, however, highly dependent on the individual marine animals; the intensity, frequency, and duration of the sound; and context in which the sound is received. In other words, production of sound is a necessary, but not sufficient, condition for an environmental impact. At a workshop on the environmental effects of tidal energy development, experts identified sound produced by turbines as an area of potentially significant impact, but also high uncertainty. The overall objectives of this project are to improve our understanding of the potential acoustic effects of tidal turbines by: (1) Characterizing sources of existing underwater noise; (2) Assessing the effectiveness of monitoring technologies to characterize underwater noise and marine mammal responsiveness to noise; (3) Evaluating the sound profile of an operating tidal turbine; and (4) Studying the effect of turbine sound on surrogate species in a laboratory environment. This study focuses on a specific case study for tidal energy development in Admiralty Inlet, Puget Sound, Washington (USA), but the methodologies and results are applicable to other turbine technologies and geographic locations. The project succeeded in achieving the above objectives and, in doing so, substantially contributed to the body of knowledge around the acoustic effects of tidal energy development in several ways: (1) Through collection of data from Admiralty Inlet, established the sources of sound generated by strong currents (mobilizations of sediment and gravel) and determined that low-frequency sound recorded during periods of strong currents is non-propagating pseudo-sound. This helped to advance the debate within the marine and hydrokinetics acoustic community as to whether strong currents produce propagating sound. (2) Analyzed data collected from a tidal turbine operating at the European Marine Energy Center to develop a profile of turbine sound and developed a framework to evaluate the acoustic effects of deploying similar devices in other locations. This framework has been applied to Public Utility District No. 1 of Snohomish Country's demonstration project in Admiralty Inlet to inform postinstallation acoustic and marine mammal monitoring plans. (3) Demonstrated passive acoustic techniques to characterize the ambient noise environment at tidal energy sites (fixed, long-term observations recommended) and characterize the sound from anthropogenic sources (drifting, short-term observations recommended). (4) Demonstrated the utility and limitations of instrumentation, including bottom mounted instrumentation packages, infrared cameras, and vessel monitoring systems. In doing so, also demonstrated how this type of comprehensive information is needed to interpret observations from each instrument (e.g., hydrophone data can be combined with vessel tracking data to evaluate the contribution of vessel sound to ambient noise). (5) Conducted a study that suggests harbor porpoise in Admiralty Inlet may be habituated to high levels of ambient noise due to omnipresent vessel traffic. The inability to detect behavioral changes associated with a high intensity source of opportunity (passenger ferry) has informed the approach for post-installation marine mammal monitoring. (6) Conducted laboratory exposure experiments of juvenile Chinook salmon and showed that exposure to a worse than worst case acoustic dose of turbine sound does not result in changes to hearing thresholds or biologically significant tissue damage. Collectively, this means that Chinook salmon may be at a relatively low risk of injury from sound produced by tidal turbines located in or near their migration path. In achieving these accomplishments, the project has significantly advanced the District's goals of developing a demonstration-scale tidal energy proj

Brian Polagye; Jim Thomson; Chris Bassett; Jason Wood; Dom Tollit; Robert Cavagnaro; Andrea Copping

2012-03-30T23:59:59.000Z

8

Near-Field Imaging with Sound: An Acoustic STM Model  

Science Journals Connector (OSTI)

The invention of scanning tunneling microscopy(STM) 30 years ago opened up a visual window to the nano-world and sparked off a bunch of new methods for investigating and controlling matter and its transformations at the atomic and molecular level.1 However an adequate theoretical understanding of the method is demanding; STM images can be considered quantum theory condensed into a pictorial representation. A hands-on model is presented for demonstrating the imaging principles in introductory teaching. It uses sound waves and computer visualization to create mappings of acoustic resonators. The macroscopic simile is made possible by quantum-classical analogies between matter and sound waves. Grounding STM in acoustic experience may help to make the underlying quantum concepts such as tunneling less abstract to students.

Manfred Euler

2012-01-01T23:59:59.000Z

9

Acoustic Building Infiltration Measurement System (ABIMS)  

Energy.gov (U.S. Department of Energy (DOE))

The Acoustic Building Infilitration Measurement System project is developing an acoustic method of measuring the infiltration of a building envelope.

10

Acoustic holography for piston sound radiation with non-uniform velocity profiles  

E-Print Network (OSTI)

Acoustic holography for piston sound radiation with non-uniform velocity profiles Ronald M. Aarts results for the radiation of sound due to a non-uniformly moving, baffled, circular piston for estimating the radially symmetric part of a velocity profile (baffled- piston radiation) from on

11

Sound beyond the speed of light: Measurement of negative group velocity in an acoustic loop filter  

E-Print Network (OSTI)

Sound beyond the speed of light: Measurement of negative group velocity in an acoustic loop filter of magnitude difference between the speeds of sound and light. © 2007 American Institute of Physics. DOI: 10,2 A central issue is whether the speed of light in vacuum c constituted an upper limit to the group velocity

Robertson, William

12

Universal power spectra for acoustic turbulence: Applications to wind waves, 1/f noise, and classical second sound  

Science Journals Connector (OSTI)

A continuum pumped full of waveenergy at an amplitude sufficiently large so that reversible nonlinearities dominate irreversible linear response becomes waveturbulent. In the limit of high nonlinearity acoustic turbulence and wind waveturbulence accumulate at 1/f and 1/f 5 power spectra respectively. A waveturbulent system can support new propagating energy modes analogous to second sound in superfluid He4. This hyperbolic (nondiffusive) transport could account for the anomalous diffusivity observed in plasma devices and for the difficulties faced in achieving confinement. The key to the understanding of these phenomena is the nonlinearity in the continuum mechanics which leads to three basic effects: (1) scattering of sound by sound to produce waves with sum and difference frequencies; (2) refraction of waves by a slowly varying (inhomogeneous) background; (3) reaction of the background due to changes in the distribution of sound waves. Details of these processes are presented in the framework of the Euler equations.

Seth Putterman; A. Larraza; P. H. Roberts

1986-01-01T23:59:59.000Z

13

Simple model of photo acoustic system for greenhouse effect  

E-Print Network (OSTI)

The simple theoretical basis for photo acoustic (PA) system for studying infrared absorption properties of greenhouse gases is constructed. The amplitude of sound observed in PA depends on the modulation frequency of light pulse. Its dependence can be explained by our simple model. According to this model, sound signal has higher harmonics. The theory and experiment are compared in third and fifth harmonics by spectrum analysis. The theory has the analogy with electric circuits. This analogy helps students for understanding the PA system.

Fukuhara, Akiko; Ogawa, Naohisa

2010-01-01T23:59:59.000Z

14

Acoustic signatures: From natural to systems science  

Science Journals Connector (OSTI)

The interest in acoustic signatures began with the problem of detecting cracks in railroad wheels. When a wheel is struck with a hammer it produces a sound like that of a bell. If the wheel is cracked it sounds dissonant and muffled. By comparing sounds from the two members of a wheelset a measure of the difference in their mechanical properties is obtained. A fully automatic system was developed and installed on a Southern Pacific track in the 1980’s. The story of this undertaking is an object lesson in systems science. Recently beams have been used as test objects in an attempt to resolve certain basic questions in the science of the acoustic monitoring method. These questions will be illustrated with results from a test fixture with various beams. The limitation of the vibration monitoring method is that other conditions such as uncertainties in the geometry of the test object its surface conditions and loading can also affect the vibration response and it is necessary to distinguish the effects due to harmful conditions from those due to harmless ones. The sensitivity of the method is thus determined by the need to make this distinction. [Work supported by NSF Grant No. MSS?9024224.

Robert D. Finch; Ben H. Jansen

1993-01-01T23:59:59.000Z

15

Acoustic sounding of the tropical marine boundary layer during GATE  

Science Journals Connector (OSTI)

A vertically pointed monostatic acoustic sounder was installed on the NOAA ShipOCEANOGRAPHER during the Global Atmospheric Research Program Atlantic Tropical Experiment (GATE). The sounderantenna was mounted on a gyrocontrolled platform to compensate for the ship'spitch and roll motions. Extensive measures such as mounting the antenna assembly on a vibration isolator and installing absorbing cuffs had to be taken to reduce interference by ship?generated noise. Back?scattered acoustic data obtained from up to 850 m height describe the tropical marine boundary layer in unique and hitherto unseen detail. During undisturbed weather conditions the facsimile record showed convective plumes rising from the surface of the water up to 400 m. Storm?generated disturbances resulted in a substantial modification of the boundary layer; low?level multilayered undulating inversions formed from cool outflow currents. The inversions persisted for up to 16 hours. Low?level patchy cumulus clouds produced characteristic hummock?shaped acoustic echoes. Analysis of the Doppler frequency shift of the returns allowed the determination of vertical velocities within these clouds and underlying convective plumes.

P. A. Mandics; J. E. Gaynor; F. F. Hall Jr.

1976-01-01T23:59:59.000Z

16

Effects of attenuation, dispersion, and high sound?pressure levels on acoustic wave distortion in horns  

Science Journals Connector (OSTI)

High?power sound sources have received a lot of attention in the past few years due to renewed interest in industrial applications of high?intensity sounds such as the acoustic agglomeration of aerosols or combustion enhancement. Most high?power sound sources require a horn to match the source impedance to the medium where the sound is radiated. Such horns introduce distortion in the initial waveform which can be detrimental to the agglomeration or combustion enhancement process. Boundary?layer attenuation smooths the wave shape while dispersion breaks up the symmetry of the waveform. Horn?induced dispersion is usually the dominant dispersion mechanism resulting in strong peaks in the waveform. Finally due to the very high acoustic levels at the horn throat finite?amplitude effects are responsible for a significant amount of distortion at high frequencies. Simple examples of waveform distortion due to these various mechanisms are shown. The effects of sound?pressure level horn design and frequency on distortion are illustrated for an exponential horn and several initial wave shapes. Experimental results are presented that compare very well with theory.

Frederic G. Pla; Gerhard Reethof

1988-01-01T23:59:59.000Z

17

Passive acoustic monitoring of biological and anthropogenic sounds at America’s first offshore wind farm  

Science Journals Connector (OSTI)

Cape Wind situated in Nantucket Sound Massachusetts is poised to become America’s first offshore windfarm. Our objective is to establish baseline (pre-construction) sound levels of human and biological activity including diel and seasonal variability of various sound types at the construction site and three nearby comparison sites. Acoustic recorders have been deployed since April 2012 recording on a 10% duty cycle (sample rate: 80 kHz). Biological contributions to the local soundscape are primarily fish sounds with the dominant signal likely being cusk eel (Family Ophidiidae) calls. These calls which are composed of stereotyped pulses with an average bout duration of 3.3 ±0.8 s and mean peak frequency of 1030 ±200 Hz show both seasonal and diel variation. Dense choruses were detected during summer (July) but limited activity occurred in the fall and winter. During vocal periods detections occurred throughout the day but peaked near dusk. Vessel traffic also showed diel and seasonal trends with peaks during the daytime and in the summer which indicates that boat activity can be tracked acoustically. These trends in biological and anthropogenic activity provide key baseline records for evaluating the influence of windfarm construction and operation on a local US soundscape.

T. Aran Mooney; Maxwell B. Kaplan; Luca Lamoni; Aimee Boucher; Laela S. Sayigh

2013-01-01T23:59:59.000Z

18

Acoustic conversion of heat to sound at mid?audio frequencies  

Science Journals Connector (OSTI)

A thermoacoustic prime mover was developed for conversion of heat to sound that is then directly converted to electricity. The acoustic device consists of a 2.7?kHz quarter?wave resonator with a stack of random material between a hot heat exchanger and a cold heat exchanger. It is loaded by a cavity that couples the sound to a piezoelectric device for generation of electrical power. Optimization of this device for energy conversion was based on studies of heat injection temperature difference threshold for onset of oscillation heat flow in the device quality factor Q of the resonator response time to heat input and sound power output. Parameters for optimization included different mesh sizes for the heat exchangers given stack filling factors and levels of positive feedback from the acoustic cavity. Response time to heat injection was lowered by coupling the heat source directly to the hot heat exchanger. Device efficiency was doubled by reducing heat losses along the supporting structure of the stack. Temperature differences for oscillation were as low as 50°C and sound levels of 130 dB were achieved. Thus device performance was enhanced substantially by optimizing geometric factors.

2007-01-01T23:59:59.000Z

19

Sound-Recording Systems for Measuring Sound Levels During Seismic Surveys  

Science Journals Connector (OSTI)

Two new sound-recording systems were developed as part of a study on the effects of sound from seismic air guns on fish behavior. The systems were used to record ... ) at several depths and distances from the seismic

Jan Tore Øvredal; Bjorn Totland

2012-01-01T23:59:59.000Z

20

Acoustics of Buildings: including Acoustics of Auditoriums and Sound-proofing of Rooms  

Science Journals Connector (OSTI)

... THE acoustics of buildings is a subject which has always possessed importance, but with the increasing size of ... is a subject which has always possessed importance, but with the increasing size of public buildings and the congestion of our urban populations, it has assumed much greater importance in ...

1924-07-19T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Testing Thermo-acoustic Sound Generation in Water with Proton and Laser Beams  

E-Print Network (OSTI)

Experiments were performed at a proton accelerator and an infrared laser acility to investigate the sound generation caused by the energy deposition of pulsed particle and laser beams in water. The beams with an energy range of 1 PeV to 400 PeV per proton beam spill and up to 10 EeV for the laser pulse were dumped into a water volume and the resulting acoustic signals were recorded with pressure sensitive sensors. Measurements were performed at varying pulse energies, sensor positions, beam diameters and temperatures. The data is well described by simulations based on the thermo-acoustic model. This implies that the primary mechanism for sound generation by the energy deposition of particles propagating in water is the local heating of the media giving rise to an expansion or contraction of the medium resulting in a pressure pulse with bipolar shape. A possible application of this effect would be the acoustical detection of neutrinos with energies greater than 1 EeV.

K. Graf; G. Anton; J. Hoessl; A. Kappes; T. Karg; U. Katz; R. Lahmann; C. Naumann; K. Salomon; C. Stegmann

2005-09-15T23:59:59.000Z

22

Proposition of new acoustical parameters to analyze the 3D spatial composition of sound in music spaces  

Science Journals Connector (OSTI)

From acoustic measurements conducted in more than 100 renowned historical music spaces for the Constellation Project this paper proposes new acoustical parameters created to better describe the 3D spatial composition of sound in music spaces. Using B?format recordings the author is proposing a visualization algorithm to plot the acoustic intensity at specific time frames and ranges. The acoustic energy is decomposed into relevant space segments and energy ratio parameters LH (lateral frontal high versus lateral frontal low) and FR (lateral rear high versus lateral rear low) are deduced and proposed for analyzing the distribution of sound and the envelopment characteristics of the room. Examples of intensity plots and of the proposed 3D acoustical parameters are given for various room types ranging from small to large concert halls small to large opera houses famous organ churches and Roman basilicas.

Alban A. Bassuet

2008-01-01T23:59:59.000Z

23

Thermo-acoustic Sound Generation in the Interaction of Pulsed Proton and Laser Beams with a Water Target  

E-Print Network (OSTI)

The generation of hydrodynamic radiation in interactions of pulsed proton and laser beams with matter is explored. The beams were directed into a water target and the resulting acoustic signals were recorded with pressure sensitive sensors. Measurements were performed with varying pulse energies, sensor positions, beam diameters and temperatures. The obtained data are matched by simulation results based on the thermo-acoustic model with uncertainties at a level of 10%. The results imply that the primary mechanism for sound generation by the energy deposition of particles propagating in water is the local heating of the medium. The heating results in a fast expansion or contraction and a pressure pulse of bipolar shape is emitted into the surrounding medium. An interesting, widely discussed application of this effect could be the detection of ultra-high energetic cosmic neutrinos in future large-scale acoustic neutrino detectors. For this application a validation of the sound generation mechanism to high accur...

Lahmann, R; Graf, K; Hößl, J; Kappes, A; Katz, U; Mecke, K; Schwemmer, S

2015-01-01T23:59:59.000Z

24

Acoustic repair: Recent experience with the acoustic control system (ACS) for improving acoustic conditions in two existing venues  

Science Journals Connector (OSTI)

Active acoustics systems are becoming more prevalent in architectural acoustics practice particularly in the context of repairing or improving acoustics in existing venues. Governmental policies to reduce funds and subsidies put into new facilities for the performing arts are another reason for designers to consider the use of active acoustics. This paper highlights two recent examples of such installations of ACS systems one at the Sydney Opera House Concert Hall and the other at MBCCH Winnepeg Canada. Collaboration between the system designer the musicians and the acoustics consultant will be emphasized along with techniques used to evaluate the systems' performance in the halls.

Timothy E. Gulsrud; Arthur van Maurik

2011-01-01T23:59:59.000Z

25

BIG BANG ACOUSTICS SOUND IN THE EARLY UNIVERSE Article for the Acoustical Society of America magazine: ECHOES  

E-Print Network (OSTI)

includes all the associated sounds, can be found on my website at http://www.astro.virginia.edu/dmw8f

Whittle, Mark

26

RECORDING SOUND WORLDS: DOCUMENTING NATURAL LIFE AND PLACING BIO-ACOUSTICS  

E-Print Network (OSTI)

; but they can all too easily go unheard. In varied combination, wildlife, weather, wind and waves, archival records, and journals of: the BBC Natural History Recording Unit; the British Library of Wildlife Sounds, a Department of the British Institute of Recorded Sound; the Wildlife Sound Recording S

Guo, Zaoyang

27

Acoustic Analysis of R.E.E.L. Semi-Reveberant Sound Chamber  

E-Print Network (OSTI)

Institute ASHRAE The American Society of Heating, Refrigerating and Air-Conditioning Engineers ANSI American National Standards Institute dB Decibel Lp Sound Pressure Level (dB) Lw Sound Power Level (dB) BKG Background Noise TL Sound... PROCEDURE .......................................................................16 H.V.I. Standard ....................................................................................................................18 SONE Calculation...

Elliston, Sean David

2012-07-16T23:59:59.000Z

28

Application of acoustic sounding to estimating fusion in an atmospheric boundary layer  

Science Journals Connector (OSTI)

An acoustic sounder system can be configured to provide estimates of the vertical profile of velocity and dissipation rate of kinetic and potential energy. A method based on the concepts of boundary?layer similarity theory is outlined by which the characteristicvelocity in a freely convective boundary layer is deduced from the inversion height and the asymptotic value of the dissipation rate of kinetic energy near the inversion. These values in conjunction with the mean velocity are used to establish the normalized heights downwind and cross?wind distances and cross?wind integrated concentrations. The normalized lateral and vertical standard deviations are then deduced from empirically established laboratory relationships for nonbuoyant particulates. Preliminary analysis indicate a similar methodology may be applicable to the stable boundary layer.

Bryan R. Kerman

1976-01-01T23:59:59.000Z

29

Architectural acoustics  

Science Journals Connector (OSTI)

This tutorial will familiarize people with basic concepts in architectural acoustics. Many slides of actual buildings and a brief audio tape will be used to illustrate connections between the visual appearance of buildings and the qualities of their sonic environment. The presentation will provide examples and explanations of common acoustic experiences in buildings with the under?lying reasons for their occurrence. Architectural acoustics can be characterized as an evolving empirical exploration of basic principles from many areas of acoustics through creative testing in the design and subsequent evaluation of buildings. A historical review of applied acoustical principles translated into the medium of architecture will be presented in four primary areas: (1) subjective impressions including qualities of music speech intelligibility and annoyance which are the basis for current design criteria; (2) room acoustics design with an emphasis on auditoria schools restaurants and other public buildings; (3) providing privacy from unwanted sounds and vibrations through discussion of standard measurement techniques such as sound transmission class (STC); and (4) management of noise from HVAC systems and other equipment and processes in buildings. Interesting case studies will demonstrate how complex the practical application of even relatively simple acoustical principles can be in many buildings. In recent years a significant community of laboratory and applied researchers dedicated to this field has emerged to question and quantify the empirical knowledge base that has been accumulated over time. Recent topics of interest such as new measurement modeling and simulation techniques will be briefly introduced.

Gary W. Siebein

1994-01-01T23:59:59.000Z

30

Systems theory in musical acoustics  

Science Journals Connector (OSTI)

Recent digital synthesis techniques for woodwind bores and strings (bowed plucked and the like) have been devised using long delay lines and sparsely distributed filter elements to efficiently simulate solutions to the one?dimensional wave equation. In the simplest case a string or bore can be modeled using a single delay line and a single low?order digital filter. This presentation describes techniques used to simulate specific physical phenomena in the context of these models. As is well known in the lossless case solutions to the 1?D wave equation can be expressed in terms of left?going and right?going traveling waves and these are efficiently simulated using pure delay lines plus perhaps a sign inversion at a termination. Abutting two waveguides of differing characteristic impedance gives rise to a scattering junction at the interface leading to the ladder and lattice digital filter structures used extensively in the field of signal processing. When there are losses or when string stiffness is important there is linear filtering along the waveguide. Because linear time?invariant filters commute the distributed losses and dispersion can be lumped at convenient places in the waveguide network without changing an input?output transfer function. Once they are thus consolidated it is usually possible especially in audio applications to find a very accurate approximation using a low?order lumped digital filter in place of the distributed filtering. On top of this physically accurate yet efficient model it is straightforward to introduce nonlinear extensions such as (1) bow?string slippage due to absolute string displacement (2) pitch decay due to the gradual decline of the average string tension (3) wave?front sharpening due to increased speed of sound at higher air pressures (4) closure forces on double reeds and vocal folds due to the Bernoulli effect (5) heat conduction losses and (6) spontaneous generation of turbulence due to high volume velocity through a narrow aperture.

Julius O. Smith III

1990-01-01T23:59:59.000Z

31

Entropic-acoustic instability of shocked Bondi accretion I. What does perturbed Bondi accretion sound like ?  

E-Print Network (OSTI)

In the radial flow of gas into a black hole (i.e. Bondi accretion), the infall of any entropy or vorticity perturbation produces acoustic waves propagating outward. The dependence of this acoustic flux on the shape of the perturbation is investigated in detail. This is the key process in the mechanism of the entropic-acoustic instability proposed by Foglizzo & Tagger (2000) to explain the instability of Bondi-Hoyle-Lyttleton accretion. These acoustic waves create new entropy and vorticity perturbations when they reach the shock, thus closing the entropic-acoustic cycle. With an adiabatic index 1acoustic refraction, below which ingoing acoustic waves are refracted out. This cut-off is significantly smaller than the Keplerian frequency at the sonic radius and depends on the latitudinal number l of the perturbations. When advected adiabatically inward, entropy and vorticity perturbations trigger acoustic waves propagating outward, with an efficiency which is highest for non radial perturbations l=1. The outgoing acoustic flux produced by the advection of vorticity perturbations is always moderate and peaks at rather low frequency. By contrast, the acoustic flux produced by an entropy wave is highest close to the refraction cut-off. It can be very large if gamma is close to 5/3. These results suggest that the shocked Bondi flow with gamma=5/3 is strongly unstable with respect to the entropic-acoustic mechanism.

T. Foglizzo

2001-01-04T23:59:59.000Z

32

The study of waves is clearly an important subject in acoustics because sound energy is transmitted by waves traveling though air. Furthermore, it turns out that the  

E-Print Network (OSTI)

Waves The study of waves is clearly an important subject in acoustics because sound energy energy without any net movement of mass. In other words the energy in the wave moves from point A to point B without moving any material from A to B. After transmission of wave energy the medium is left

Robertson, William

33

Formal Type Soundness for Cyclone's Region System Dan Grossman  

E-Print Network (OSTI)

management of Cyclone and its static typing discipline. The design incorporates several advance- mentsFormal Type Soundness for Cyclone's Region System Dan Grossman Greg Morrisett Trevor Jim Mike Hicks Yanling Wang James Cheney November 2001 Abstract Cyclone is a polymorphic, type-safe programming language

Hicks, Michael

34

Electret Acoustic Transducer Array For Computerized Ultrasound Risk Evaluation System  

DOE Patents (OSTI)

An electret-based acoustic transducer array is provided and may be used in a system for examining tissue. The acoustic transducer array is formed with a substrate that has a multiple distinct cells formed therein. Within each of the distinct cells is positioned an acoustic transducing element formed of an electret material. A conductive membrane is formed over the distinct cells and may be flexible.

Moore, Thomas L. (Livermore, CA); Fisher, Karl A. (Brentwood, CA)

2005-08-09T23:59:59.000Z

35

TACTILE COMPOSITION SYSTEMS FOR COLLABORATIVE FREE SOUND  

E-Print Network (OSTI)

Kingdom me@chrisoshea.org ABSTRACT Numerous innovative controllers and collaborative tactile interfaces in the audiovisual tactile mixer field offering realtime visual feedback in addition to a tangible control interface developed by the creators of such systems. The authors consider the software integration of such systems

Miranda, Eduardo Reck

36

Modeling acoustics in virtual environments using the uniform theory of diffraction  

Science Journals Connector (OSTI)

Realistic modeling of reverberant sound in 3D virtual worlds provides users with important cues for localizing sound sources and understanding spatial properties of the environment. Unfortunately, current geometric acoustic modeling systems do not accurately ...

Nicolas Tsingos; Thomas Funkhouser; Addy Ngan; Ingrid Carlbom

2001-08-01T23:59:59.000Z

37

Electromechanical transducer for acoustic telemetry system  

DOE Patents (OSTI)

An improved electromechanical transducer is provided for use in an acoustic telemetry system. The transducer of this invention comprises a stack of ferroelectric ceramic disks interleaved with a plurality of spaced electrodes which are used to electrically pole the ceramic disks. The ceramic stack is housed in a metal tubular drill collar segment. The electrodes are preferably alternatively connected to ground potential and driving potential. This alternating connection of electrodes to ground and driving potential subjects each disk to an equal electric field; and the direction of the field alternates to match the alternating direction of polarization of the ceramic disks. Preferably, a thin metal foil is sandwiched between electrodes to facilitate the electrical connection. Alternatively, a thicker metal spacer plate is selectively used in place of the metal foil in order to promote thermal cooling of the ceramic stack.

Drumheller, Douglas S. (Cedar Crest, NM)

1993-01-01T23:59:59.000Z

38

Passive localization of acoustic sources in media with non-constant sound velocity  

E-Print Network (OSTI)

. S. Norris. (Univ. of Calif. , Berkeley, CA), pp. 510-527. Bowles, A. E. , Sumultea, M. , Wursig, B, , DeMaster, D. P. , and Palka, D. (1994). "Relative abundance and behavior of marine mammals exposed to transmissions from the Heard Island.... S. Natl. Res. Counc, , Ocean Stud. Board, Committee on Low- Frequency Sound and Marine Mammals. Green, D. M. , DeFerrari, H. A. , McFadden, D. , Pearse, J. S. , Popper, A. N. , Richardson, W. J. , Ridgway, S. H. , and Tyack, P. L, , (Natl. Acad...

Brandes, Thomas Scott

1998-01-01T23:59:59.000Z

39

Two-Dimensional Hybrid Spatial Audio Systems with User Variable Controls of Sound Source Attributes  

Science Journals Connector (OSTI)

This paper presents two novel hybrid spatial audio systems demonstrated for use in two-dimensional ... further creative freedom to a composer, sound engineer or sound designer. The systems are principally ... bas...

Martin J. Morrell; Joshua D. Reiss

2013-01-01T23:59:59.000Z

40

Acoustical Communications for Wireless Downhole Telemetry Systems  

E-Print Network (OSTI)

on this testbed in order to characterize the channel behavior are explained as well. Moreover, the large scale statistics of the acoustic waves along the pipe string are described. Results of this work indicate that acoustic waves experience a frequency- dependent...

Farraj, Abdallah

2012-08-22T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

The synthesis of sound figures  

Science Journals Connector (OSTI)

In this paper we discuss a novel technique to control the spatial distribution of sound level within a synthesized sound field. The problem is formulated by separating the sound field into regions with high acoustic level, so-called bright regions, and ... Keywords: Multichannel sound reproduction, Quiet zones, Sound field synthesis, Sound figures

Karim Helwani; Sascha Spors; Herbert Buchner

2014-04-01T23:59:59.000Z

42

Instrument Development Tethered Balloon Sounding System for Vertical Radiation Profiles  

NLE Websites -- All DOE Office Websites (Extended Search)

Tethered Balloon Sounding System Tethered Balloon Sounding System for Vertical Radiation Profiles C. D. Whiteman J. M. Alzheimer G. A. Anderson M. R. Garnich W. J. Shaw Pacific Northwest Laboratory Richland, WA 99352 platform is built on a triangular frame identical to the one on the Sky Platform, but the MSP carries no radiometric sensors, control loop, or leveling motors. Rather. the MSP is instrumented to measure the motions to which the Sky Platform will be subjected; the data provide engineering information to be used in the final design of the control loop and structural elements of the Sky Platform. An array of six miniature solid state accelerometers provides the raw data from which balloon motions are determined. Future plans call for the installation of a small attitude gyroscope on the

43

The CLEAR 2006 CMU acoustic environment classification system  

Science Journals Connector (OSTI)

We describe the CLEAR 2006 acoustic environment classification evaluation and the CMU system used in the evaluation. Environment classification is a critical technology for the CHIL Connector service [1] in that Connector relies on maintaining awareness ...

Robert G. Malkin

2006-04-01T23:59:59.000Z

44

A Novel Approach to Build a Generic Model of Photovoltaic Solar System Using Sound Biometric Techniques  

Science Journals Connector (OSTI)

This chapter presents the proposed model of combination between Photovoltaic solar system resources and sound biometric techniques, to generate power energy from the sunlight using the PVS controlled by a sound biometric technique. This work contributes ... Keywords: Electricity Consumption, Energy Conversion, Energy Storage Device, Photovoltaic Solar System (PVS), Sound Recognition Techniques

Khalid T. Al-Sarayreh, Kenza Meridji, Ebaa Fayyoumi, Sahar Idwan

2014-01-01T23:59:59.000Z

45

Soundgen : a Web services based sound generation system for the psychoacoustics laboratory  

E-Print Network (OSTI)

Soundgen is a web services based sound generation system developed for the MIT Psychoacoustics Laboratory Course 6.I82. The sounds created by Soundgen are combinations of various tones and noises, produced by a dedicated ...

Naber, Michael R

2008-01-01T23:59:59.000Z

46

Proceedings of ICONS 2002. International Conference on Sonar Sensors and Systems. SOUND FROM A LIGHT AIRCRAFT  

E-Print Network (OSTI)

in all three media. A technique has been developed for measuring the low-frequency sound speed A LIGHT AIRCRAFT FOR UNDERWATER ACOUSTICS APPLICATIONS Michael J. Buckingham, Eric M. Giddens, Fernando the coast, north of La Jolla, southern California, USA, in which a single-engine, propeller-driven light

Buckingham, Michael

47

Building Energy Software Tools Directory: Acoustics Program  

NLE Websites -- All DOE Office Websites (Extended Search)

Acoustics Program Acoustics Program Developed to help designers accurately model the sound level reaching building tenant's ears, the Trane Acoustics Program (TAP) "projects" equipment sound power data through the surroundings (e.g., floors, ductwork, walls), to estimate the sound level that will be heard. Industry-standard calculations published by ASHRAE's 1991 Algorithms for HVAC Acoustics handbook are the basis for this estimate. In TAP, you can model the conditions of an HVAC system by choosing specific equipment and building component criteria. TAP will analyze the sound path and calculate the total effect for the enclosed space. You can continuously adjust the data and system design criteria to compare the results effortlessly. TAP will even plot presentation quality graphs of

48

Acoustic performance of an installed real?time three?dimensional audio system—Part II.  

Science Journals Connector (OSTI)

The exterior effects room (EER) located at the NASA Langley Research Center was recently upgraded to allow for simulation of aircraft flyovers in a three?dimensional (3?D) audio and visual environment. The 3?D audio server employs an implementation of the vector base amplitude panning (VBAP) method to position virtual sources at arbitrary azimuth and elevation angles in the EER. Recent work focused on the development of loudspeaker equalization first using high order FIR filters [POMA 9 015004 (2010)] and later using low order IIR filters [J. Acoust. Soc. Am. 128 2482 (2010)]. The latter in conjunction with full?path time delay compensation and relative gain compensation were implemented in real?time and shown to reproduce the desired sound field to within about ±5 dB over an extended frequency range for stationary and moving sources. In the present work the performance is further characterized both objectively and subjectively. Addressed are calibration of the system for absolute sound pressure level reproduction and measurement of the spatial uniformity of the generatedsound field. Further localization of sound sources will be subjectively measured to assess the efficacy of the VBAP implementation in the EER.

Kenneth J. Faller II; Stephen A. Rizzi; Aric R. Aumann

2011-01-01T23:59:59.000Z

49

Acoustic wind and wind?shear measuring system  

Science Journals Connector (OSTI)

An acoustic wind?profiling system designed to detect hazardous wind?shear conditions in the airport environment has been developed during the past four years. The system installed at Dulles International Airport consists of a vertically pointed transmitter surrounded by three receivers 290?m distant and separated by 120° in azimuth. Electronically steered receiver beams track the upward propagating transmitted tone burst and collect the scatteredacoustic signals. The Doppler frequency shift of the returns is analyzed digitally to determine the horizontal wind at 20 height levels in 30?m increments. Unique design features of the system such as the steered receiver antenna are described. A one?leg prototype of the Dulles system was installed and tested at Table Mountain near Boulder CO. Winds measured by the prototype acoustic system compared well with those determined by an FM?CW radar and a balloon?borne anemometer. Noisegenerated by rain and surface winds exceeding 16 m sec?1 proved to be the major limitations for the acoustic system. Preliminary results from the Dulles system are also presented.

P. A. Mandics; D. W. Beran

1976-01-01T23:59:59.000Z

50

Acoustics by additive manufacturing:.  

E-Print Network (OSTI)

??This study focuses on exploring the merging field of additive manufacturing and acoustics and introduces a new type of sound absorber which is regulating performance… (more)

Setaki, F.

2012-01-01T23:59:59.000Z

51

Energy Integration Describes Sound-Intensity Coding in an Insect Auditory System  

E-Print Network (OSTI)

Energy Integration Describes Sound-Intensity Coding in an Insect Auditory System Tim Gollisch receptor; hearing; sound intensity; energy; model; locust Auditory receptor cells are commonly measurements of intensity-duration tradeoffs sug- gest that the stimulus energy is the crucial variable (Garner

Benda, Jan

52

Acoustic waves generated from seismic surface waves: propagation properties determined from Doppler sounding observations and normal-mode modelling  

Science Journals Connector (OSTI)

......acoustic waves in the atmosphere, because the wavelength...here omegaa= 3.68 mHz. (Right panel) Spheroidal...When omega omegaa, the atmospheric part of the mode is trapped...HF) wave (3-30 MHz), emitted from the...altitude where the local plasma frequency is equal to......

Juliette Artru; Thomas Farges; Philippe Lognonné

2004-09-01T23:59:59.000Z

53

System for detecting acoustic emissions in multianvil experiments: Application to deep seismicity in the Earth  

E-Print Network (OSTI)

System for detecting acoustic emissions in multianvil experiments: Application to deep seismicity be responsible for the occurrence of earthquakes. Detecting acoustic emissions from a specimen during faulting acoustic emissions under HPHT conditions, due to technical challenges. And those studies have used only one

Jung, Haemyeong

54

Application of a modified gradient lease squares algorithm to an adaptive, actively quenched, sound field system  

SciTech Connect

A modified least squares algorithm, preventing the overflow of the discharge grid of weight coefficients of an adaptive transverse filter and guaranteeing stable system operation, is suggested for the tuning of an adaptive system of an actively quenched sound field. Experimental results are provided for an adaptive filter with a modified algorithm in a system of several harmonic components of an actively quenched sound field.

Belyakov, A.A.; Mal`tsev, A.A.; Medvedev, S.Yu. [and others

1995-04-01T23:59:59.000Z

55

2005 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics October 16-19, 2005, New Paltz, NY A PROTOTYPE SYSTEM FOR OBJECT CODING OF MUSICAL AUDIO  

E-Print Network (OSTI)

2005 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics October 16-19, 2005, New Paltz, NY A PROTOTYPE SYSTEM FOR OBJECT CODING OF MUSICAL AUDIO Emmanuel Vincent and Mark D coding of musical audio, and more precisely with the extraction of pitched sound objects in polyphonic

Paris-Sud XI, Université de

56

Microscopic theory of sound propagation in the superfluid {sup 3}He-aerogel system  

SciTech Connect

We present a theory of sound propagation in superfluid {sup 3}He confined in aerogel, taking dragged aerogel motion into account. The superfluid dynamics coupled with the aerogel motion is formulated by use of the Keldysh Green's function for weak-coupling superfluid Fermi liquid. We apply the theory to the hydrodynamic regime and calculate the attenuation of a hydrodynamic longitudinal sound mode, the so-called fast mode. The result is compared to the acoustic experiment reported by the Northwestern University group [R. Nomura, G. Gervais, T. M. Haard, Y. Lee, N. Mulders, and W. P. Halperin, Phys. Rev. Lett. 85, 4325 (2000); G. Gervais, R. Nomura, T. M. Haard, Y. Lee, N. Mulders, and W. P. Halperin, J. Low Temp. Phys. 122, 1 (2001)]. We find reasonable agreement between the theory and the experiment.

Higashitani, S.; Miura, M.; Yamamoto, M.; Nagai, K. [Faculty of Integrated Arts and Sciences, Hiroshima University, Kagamiyama 1-7-1, Higashi-Hiroshima 739-8521 (Japan)

2005-04-01T23:59:59.000Z

57

Simplified, low?cost, efficient, acoustic levitation system  

Science Journals Connector (OSTI)

Recently I have improved apparatus for the acoustic levitation of a drop of one liquid in another making it practical to build for anyone who has an oscillaior and audio amplifier with response to 50 kHz a current probe an inexpensive oscilloscope and a lead zirconate titanate cylinder of the right size. This piezoelectric cylinder (1.5?in. o.d. and length 0.125?in. thickness) is epoxied near the center of a foot long piece of standard 30?mm o.d. pyrex tube. A hollow piston with o?ring seal and O. 005?in. diaphragm acts as an excellent bottom pressure?release reflector of acoustic energy as is the top air—liquid interface leading to strong acoustic standing waves at particular resonance frequencies. Optimum frequencies are determined by observing the input current to the transducer as the oscillator is tuned between 47 and 55 kHz and as liquid and piston levels are adjusted. Benzene droplets in water have been levitated with only a fraction of a watt input to the transducer. More details of this simple system will be described. [Work supported by U. S. Office of Naval Research and NSF Heat Transfer Program.

Robert E. Apfel

1977-01-01T23:59:59.000Z

58

Acoustic plug release indicator  

SciTech Connect

The present invention comprises an acoustic plug release indicator system. The acoustic plug release indicatior system comprises a microphone, recording system and operator listening device.

Carter, E.E. Jr.

1984-09-04T23:59:59.000Z

59

BeepBeep: a high accuracy acoustic ranging system using COTS mobile devices  

Science Journals Connector (OSTI)

We present the design, implementation, and evaluation of BeepBeep, a high-accuracy acoustic-based ranging system. It operates in a spontaneous, ad-hoc, and device-to-device context without leveraging any pre-planned infrastructure. It is a pure software-based ... Keywords: acoustic ranging, localization, proximity detection, ranging, ranging systems

Chunyi Peng; Guobin Shen; Yongguang Zhang; Yanlin Li; Kun Tan

2007-11-01T23:59:59.000Z

60

Changes in the acoustical requirements of the 2014 editions of the Facility Guidelines Institute's Guidelines for Designand Construction of Hospitals and Outpatient Facilities and its reference document Sound & Vibration Design Guidelinesfor Health Care Facilities  

Science Journals Connector (OSTI)

Acoustical design criteria for health care facilities as defined by the FGI Guidelines have been updated in the recently published 2014 edition. Sound & Vibration Design Guidelines for Health Care Facilities (S&V3.0) serves as the sole acoustical reference for the FGI Guidelines and has also been updated as part of the 2014 FGI cycle. The S&V reference is authored and edited by the FGI's acoustical working group. The secretary of this group (Horan) will summarize these changes and will also discuss the public review and comment process that led to the updated Guidelines. This same process will be used in the forthcoming cycle in preparation for the 2018 edition(s).

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

A proposed system to automatically control audio sound-to-noise levels  

E-Print Network (OSTI)

A PROPOSED SYSTEM TO AUTOMATICALLY CONTROL AUDIO SOUND TO NOISE LEVELS A Thesis ~ ]3y GARY 8% NEINAST Submitted to the Graduate Sohool of the Agrioultural and Meohanioal College of Texas in partial fulfillment of the requirements... for the degree oi' MASTER OP SCIENCE August 1957 Major Sub]eot'f Eleotrioal Engineering A PROPOSED SYSTEM TO AUTOMATICALLY CONTROL AUDIO SOUND-TO-NOISE LEVELS k Thesis QARY S. NEINAST Approved as to style and content by& islay a FBNR o 0 ee e epsx' ne...

Neinast, Gary Strickland

2012-06-07T23:59:59.000Z

62

Methods And Systems For Using Reference Images In Acoustic Image Processing  

DOE Patents (OSTI)

A method and system of examining tissue are provided in which a field, including at least a portion of the tissue and one or more registration fiducials, is insonified. Scattered acoustic information, including both transmitted and reflected waves, is received from the field. A representation of the field, including both the tissue and the registration fiducials, is then derived from the received acoustic radiation.

Moore, Thomas L. (Livermore, CA); Barter, Robert Henry (Oakland, CA)

2005-01-04T23:59:59.000Z

63

Electron-acoustic solitons in an electron-beam plasma system Matthieu Berthomiera)  

E-Print Network (OSTI)

Electron-acoustic solitons in an electron-beam plasma system Matthieu Berthomiera) Swedish Physics, Uppsala, Sweden Received 18 November 1999; accepted 16 March 2000 Electron-acoustic solitons exist in a two electron temperature plasma with ``cold'' and ``hot'' electrons and take the form

California at Berkeley, University of

64

SYSTEM IDENTIFICATION FOR MULTI-CHANNEL LISTENING-ROOM COMPENSATION USING AN ACOUSTIC ECHO CANCELLER  

E-Print Network (OSTI)

SYSTEM IDENTIFICATION FOR MULTI-CHANNEL LISTENING-ROOM COMPENSATION USING AN ACOUSTIC ECHO hands-free telecommunication devices jointly apply several subsystems, e.g. for noise reduction (NR), acoustic echo cancella- tion (AEC) and listening-room compensation (LRC). In this contri- bution

Lübeck, Universität zu

65

Design of Electric or Hybrid vehicle alert sound system for pedestrian  

E-Print Network (OSTI)

Design of Electric or Hybrid vehicle alert sound system for pedestrian J.-C. Chamard and V, France 1691 #12;The arrival of fully or hybrid electric vehicles raised safety problems respect the environment to warn of his approach. However, hybrid and electric vehicles can potentially be dangerous

Boyer, Edmond

66

A Portable Elf-Mt System For Shallow Resistivity Sounding | Open Energy  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » A Portable Elf-Mt System For Shallow Resistivity Sounding Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Portable Elf-Mt System For Shallow Resistivity Sounding Details Activities (0) Areas (0) Regions (0) Abstract: In view of recent extensive investigation of shallow resistivity structure for active fault studies and geothermal exploration, we developed a portable magnetotelluric (MT) system for the extremely low frequency (ELF) range. The system aims primarily at making real-time analyses of MT data at the so-called Schumann resonance frequencies of ~ 8, 14 and 20 Hz.

67

Acoustic Resonance Spectroscopy (ARS) Munition Classification System enhancements. Final report  

SciTech Connect

Acoustic Resonance Spectroscopy (ARS) is a non-destructive evaluation technology developed at the Los Alamos National Laboratory (LANL). This technology has resulted in three generations of instrumentation, funded by the Defense Special Weapons Agency (DSWA), specifically designed for field identification of chemical weapon (CW) munitions. Each generation of ARS instrumentation was developed with a specific user in mind. The ARS1OO was built for use by the U.N. Inspection Teams going into Iraq immediately after the Persian Gulf War. The ARS200 was built for use in the US-Russia Bilateral Chemical Weapons Treaty (the primary users for this system are the US Onsite Inspection Agency (OSIA) and their Russian counterparts). The ARS300 was built with the requirements of the Organization for the Prohibition of Chemical Weapons (OPCW) in mind. Each successive system is an improved version of the previous system based on learning the weaknesses of each and, coincidentally, on the fact that more time was available to do a requirements analysis and the necessary engineering development. The ARS300 is at a level of development that warrants transferring the technology to a commercial vendor. Since LANL will supply the computer software to the selected vendor, it is possible for LANL to continue to improve the decision algorithms, add features where necessary, and adjust the user interface before the final transfer occurs. This paper describes the current system, ARS system enhancements, and software enhancements. Appendices contain the Operations Manual (software Version 3.01), and two earlier reports on enhancements.

Vela, O.A.; Huggard, J.C.

1997-09-18T23:59:59.000Z

68

E-Print Network 3.0 - acoustic telemetry system Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Summary: Anderson and Urquhart, 1986 12;Animal Weight Telemetry System, i.e. Cow Boots Horn, F.P. 1981. Direct... . JER 12;Acoustic Telemetry Nelson et al. 2005. Wildlife...

69

Negative resistances in nonlinear lumped acoustic systems and IC?engine source data  

Science Journals Connector (OSTI)

Negative real parts of impedances can be found in IC?engine source characterization measurements. There is an obvious problem with the physical interpretation of negative resistances and consequently there have been many questions about the validity of such results. This paper is an attempt to explain the origin of the mentioned negative acoustic resistances. To this end a simple nonlinear lumped acoustic system that is a force?driven damped mass?spring system is analyzed. Since this is a common case in acoustic measurements linear analysis is performed in spite of the obvious nonlinear properties. It is shown that the degree of nonlinearity in the system is crucial to the values of the acoustic impedance. Furthermore it is shown that it is possible to achieve negative resistances already in a simple lumped system. Finally these results are also compared to simulated and measured IC?engine source impedances.

Fredrik Albertson

1999-01-01T23:59:59.000Z

70

Design and Instrumentation of a Measurement and Calibration System for an Acoustic Telemetry System  

SciTech Connect

The Juvenile Salmon Acoustic Telemetry System (JSATS) is an active sensing technology developed by Portland District, the U.S. Army Corps of Engineers for detecting and tracking small fish. It is used at hydroelectric projects and in the laboratory for evaluating behavior and survival of juvenile salmonids migrating through the Federal Columbia River Power System to the Pacific Ocean. It provides critical data for salmon protection and development of more “fish-friendly” hydroelectric facilities. The objective of this study was to design and build a measurement and calibration system for evaluating the JSATS component, because the JSATS requires comprehensive acceptance and performance testing in a controlled environment before it is deployed in the field. The system consists of a reference transducer, a water test tank lined with anechoic material, a motion control unit, a reference receiver, a signal conditioner and amplifier unit, a data acquisition board, MATLAB control and analysis interface, and a computer. The fully integrated system has been evaluated successfully at various simulated distances and using different encoded signals at frequencies within the bandwidth of the JSATS transmitter. It provides accurate acoustic mapping capability in a controlled environment and automates the process that allows real-time measurements and evaluation of the piezoelectric transducers, sensors, or the acoustic fields. The measurement and calibration system has been in use since 2009 for acceptance and performance testing of, and further improvements to, the JSATS.

Deng, Zhiqun; Weiland, Mark A.; Carlson, Thomas J.; Eppard, M. B.

2010-03-31T23:59:59.000Z

71

Compression of felt?type thermal insulation layer for underfloor heating system and floor impact sound  

Science Journals Connector (OSTI)

In Korea almost every house uses underfloor heating which has advantages of thermal comfort and energy efficiency. However when it is constructed for high?rise apartment houses it yields a problem in floor impact sound insulation. It accounts for the fact that a foam?type thermal insulator sandwiched between structural slab and heating floor functions as a spring and easily transmits impacts on the floor to the slab. In that case the system's transmissibility is determined by dynamic stiffness of the thermal insulation layer and the lower the dynamic stiffness is the more the floor impact is isolated. For that reason apartments construction companies are attempting to lower the dynamic stiffness of the thermal insulation layer for impact sound reduction. As part of the attempt felt?type materials with relatively low dynamic stiffness such as glass wool or polyester felt are considered as a substitution for the foam?type thermal insulator. However there is a possibility that compression of the felt?type materials would increase the dynamic stiffness and the impact sound insulation effect at early stage might be weakened in the long term. This paper investigates the correlation between gradual compression of the felt?type thermal insulation layer and the impact sound variation.

Tongjun Cho; Hyun?Min Kim

2008-01-01T23:59:59.000Z

72

IN ACOUSTICS UndergraduateCourses2015  

E-Print Network (OSTI)

APPLYING SOUND KNOWLEDGE IN ACOUSTICS Acoustics UndergraduateCourses2015 #12;SOUTHA 2 #12;Reach-leadingacademicsoncoursesthataredesignedaroundyou. Wegetyoureadyfortheglobaljobsmarket,whilegivingyouagreat studentexperience. Acousticalcountriestoreducenoise REDUCING AIRCRAFT NOISE OurRollsRoyceUniversity TechnologyCentreforGas Turbine

Sóbester, András

73

Acoustic and biological studies of pitched blade mixing systems  

E-Print Network (OSTI)

of blade construction on coalesence. Van't Riet also showed the dependence of power consumption on vessel geometry, hold up, bubble size, and the number of impeller blades present. Warmoeskerken et s. l (51 described gas loading regimes of the pitched... also be obtained with Fourier transforms. Strasberg reviewed sound emissions from: 1) bubble formation at a nozzle; 2) bubble coalescence and splitting; 3) bubble flow past bodies and constrictions; and 4) rising bubbles; all of which may have...

Hsi, Randolph Paul

1986-01-01T23:59:59.000Z

74

Ongoing developments in classroom acoustic theory and practice in 2012, and reports on efforts to implement good classroom acoustics  

Science Journals Connector (OSTI)

We live in a time of increasingly loud competing sounds and hearing loss is the number one disability in the world. Diverse populations of school children are especially vulnerable. The result is a degradation of the child’s academic achievement. New classrooms built everyday often incorporate acoustical barriers which limit students’ achievements. Overcoming these barriers involves funding constraints construction timelines and lack of support which requires advocacy from parents school boards and design teams. This advocacy should include the ANSI Classroom Acoustics standards and an acoustical assessment of existing classrooms. Complex classroom acoustics challenges may include reduction of noise radiated by HVAC systems improved acoustic treatment of external walls to minimize exterior noise and acoustic design of walls between adjacent noisy classrooms. Next steps for schools should be to retain an architect and/or an acoustical engineer for remodels and new school construction who are well versed in acoustics for educational settings and noise control. A booklet covering these issues and designed as a practical guide for educators not versed in acoustics is in preparation by the Acoustical Society of America.

Pamela Brown; Mary Crouse

2012-01-01T23:59:59.000Z

75

Perceiving Emotion in Sounds: Does Timbre Play a Role?  

E-Print Network (OSTI)

Acoustic features of sound such as pitch, loudness, perceived duration and timbre have been shown to be related to emotion in regard to sound, demonstrating that an important connection between the perceived emotions and their timbres is lacking...

Bowman, Casady

2012-02-14T23:59:59.000Z

76

PROJECT SPECIFIC CATEGORICAL EXCLUSION FOR A WAVE GLIDER-BASED PASSIVE ACOUSTIC DETECTION SYSTEM,  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

SPECIFIC CATEGORICAL EXCLUSION FOR A WAVE SPECIFIC CATEGORICAL EXCLUSION FOR A WAVE GLIDER-BASED PASSIVE ACOUSTIC DETECTION SYSTEM, Attachment PACIFIC NORTHWEST NATIONAL LABORATORY, RICHLAND, WASHINGTON Proposed Action Pacific Northwest National Laboratory (PNNL) proposes to conduct a proof-of-principle study to develop a wave glider-based passive acoustic detection system for monitoring whale populations (e.g., presence, distribution, relative abundance). Long-term goals of the project include better understanding whale populations to facilitate environmentally responsible development of offshore energy and improving the capability to monitor the world's oceans. Location of Action The proposed action would occur at PNNL facilities in Richland, Washington; at the Marine Science Laboratory

77

E-Print Network 3.0 - acoustic information flow Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Polytechnique, Centre de mathmatiques Collection: Mathematics 4 ME706: Acoustics & Aerodynamic Sound Aerodynamic sound is the noise' produced by hydrodynamic (turbulent')...

78

E-Print Network 3.0 - acoustic fluid-structure interaction Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

and Technology Group Collection: Engineering ; Chemistry 2 ME706: Acoustics & Aerodynamic Sound Aerodynamic sound is the noise' produced by hydrodynamic (turbulent')...

79

History of structural acoustics and vibrations in the Acoustical Society of America  

Science Journals Connector (OSTI)

Structural acoustics refers to the interaction of sound and structures—the response of structures to sound the radiation of sound from vibrating structures and the effect of the acoustic medium on the structural vibrations. Interest in these subjects increased greatly during the 1930s and 40s because of practical applications in the design of microphones and loud speakers used in telephones radios and electronic phonographs. The combination of electrical and mechanical systems lead to the use of electrical engineering concepts such as impedance circuits and electrical analogies in the analysis of mechanical systems. In later years much of the work dealt with various aspects of underwater structures prompted by U.S. Navy interests. The field which began with classical analytical mechanics applications has progressed to new approaches including statistical energy analysis near?field acoustical holography fuzzy structures active control of vibrations and smart materials. In recognition of these new developments the name of the technical committee was changed in 1987 from ‘‘Shock and Vibration’’ to ‘‘Structural Acoustics and Vibration.’’

2002-01-01T23:59:59.000Z

80

Acoustical design issues for library facility planners  

Science Journals Connector (OSTI)

Acting under the provisions of the Library Services and Technology Act the U.S. Institute of Museum and Library Services retained Charles M. Salter Associates Inc. to provide a document explaining acoustical and audio/visual requirements for libraries to library planners architects and lay people. Acoustical design issues for libraries discussed on the website include site noise considerations noise standards for each use space room acoustics considerations sound isolation between various use spaces vibration control for mechanical equipment and audio/visual system considerations. The completed document forms a part of the Libris Design library facility planning information system which includes a website with recent information on facility planning topics and a database of recently constructed California public libraries.

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Micro-battery Development for Juvenile Salmon Acoustic Telemetry System Applications  

SciTech Connect

The Juvenile Salmon Acoustic Telemetry System (JSATS) project supported by the U.S. Army Corps of Engineers, Portland District, has yielded the smallest acoustic fish tag transmitter commercially available to date. In order to study even smaller fish populations and make the transmitter injectable by needles, the JSATS acoustic micro transmitter needs to be further downsized. This study focuses on the optimization of microbattery design based on Li/CFx chemistry. Through appropriate modifications, a steady high-rate pulse current with desirable life time has been achieved while the weight and volume of the battery is largely reduced. The impedance variation in as-designed microbatteries is systematically compared with that of currently used watch batteries in JSATS with an attempt to understand the intrinsic factors that control the performances of microbatteries under the real testing environments.

Chen, Honghao; Cartmell, Samuel S.; Wang, Qiang; Lozano, Terence J.; Deng, Zhiqun; Li, Huidong; Chen, Xilin; Yuan, Yong; Gross, Mark E.; Carlson, Thomas J.; Xiao, Jie

2014-01-21T23:59:59.000Z

82

Issues in acoustic field testing of quiet modular classrooms  

Science Journals Connector (OSTI)

Modular classrooms are important to American education: About 300 000 modular classrooms are currently in use by public school systems here. Good acoustical conditions for learning are no less vital for students in modular classrooms than stick?built classrooms. In an effort to promote good acoustics in modular classrooms ANSI S12 Working Group 46 is seeking to standardize acoustic field testing. Their efforts are in response to key acoustical issues of modular classrooms: Excessive noise from HVAC (heating ventilating and air conditioning) systems and poor airborne sound insulation from exterior noise sources. In a recent and notable advance an HVAC system provider reported good progress in modular HVACnoise reduction: A ducted wall mounted system was used instead of the usual free blowing system with exposed fans. HVACnoise in the unoccupied room was near the maximum 35 dB level required by ANSI S12.60. Interior noise levels were so low that efforts to confirm their values were confounded by noise contamination from exterior sources. The relatively high interior ambient noise levels were due to poor airborne sound insulation. Lessons learned from recent field testing will be discussed. Results of airborne sound insulation tests now in planning stages will be reported if available.

David Lubman; Louis C. Sutherland

2007-01-01T23:59:59.000Z

83

On the Design of a Sound System for a Mobile Audio Unit.  

E-Print Network (OSTI)

??A mobile audio unit is a wireless, battery-driven unit, the main purpose of which is to reproduce acoustic signals. This kind of unit can be… (more)

Lindström, Fredric; Eriksson, John-Erik; Dahl, Mattias

2005-01-01T23:59:59.000Z

84

Acoustic behavior of triple glazings  

Science Journals Connector (OSTI)

Making of triple glazings is the only way to still improve thermal performances of Insulating Glass Units. Possible ways with double glazings are already in use: increase the space between glasses use low emissivity coatings and special gas with lower thermal conductivity as argon or krypton. Specific acoustic weak point of double glazings is the resonance between the two panes which works as a mass spring mass system and coupling of eigenmodes of panes through the air (gas) cavity. These phenomena are of course still more important with triple glazings as there are two resonances. The paper will give all comparative data concerning thermal and acoustic performances and describe a way to achieve the same single number values of sound transmission loss with triple glazing that with double glazing by adding absorption in the gas cavities.

Marc Rehfeld; David Fournier

2008-01-01T23:59:59.000Z

85

Distributed Acoustic and Seismic Sensing  

Science Journals Connector (OSTI)

An overview of fiber optic distributed acoustic and seismic sensor system architectures is presented.

Kirkendall, Clay

86

Potential use of feebate systems to foster environmentally sound urban waste management  

SciTech Connect

Waste treatment facilities are often shared among different municipalities as a means of managing wastes more efficiently. Usually, management costs are assigned to each municipality depending on the size of the population or total amount of waste produced, regardless of important environmental aspects such as per capita waste generation or achievements in composting or recycling. This paper presents a feebate (fee+rebate) system aimed to foster urban waste reduction and recovery. The proposal suggests that municipalities achieving better results in their waste management performance (from an ecological viewpoint) be recompensated with a rebate obtained from a fee charged to those municipalities that are less environmentally sound. This is a dynamic and flexible instrument that would positively encourage municipalities to reduce waste whilst increasing the recycling.

Puig-Ventosa, Ignasi

2004-07-01T23:59:59.000Z

87

Acoustically invisible feeding blue whales in Northern Icelandic waters  

Science Journals Connector (OSTI)

Fixed passive acoustic monitoring can be used for long-term recording of vocalizing cetaceans. Both presence monitoring and animal density estimation requires the call rates and sound source levels of vocalizations produced by single animals. In this study blue whale calls were recorded using acoustic bio-logging systems in Skjálfandi Bay off Húsavík Northeast Iceland in June 2012. An accelerometer was attached to individual whales to monitor diving behavior. During 21?h recording two individuals 8?h 45?min and 13?h 2?min respectively 105 and 104 lunge feeding events and four calls were recorded. All recorded calls were down-sweep calls ranging from 105 to 48?Hz. The sound duration was 1–2?s. The source level was estimated to be between 158 and 169?dB re 1?Pa rms assuming spherical sound propagation from the possible sound source location to the tag. The observed sound production rates and source levels of individual blue whales during feeding were extremely small compared with those observed previously in breeding grounds. The feeding whales were nearly acoustically invisible. The function of calls during feeding remains unknown.

Tomonari Akamatsu

2014-01-01T23:59:59.000Z

88

Acoustically invisible cylinder  

Science Journals Connector (OSTI)

Coatings of new type recently proposed by the author (Acoustical Physics 2007 vol. 53 N5 pp. 535?545) are applied to bodies of cylindrical geometry to reduce reflection or scattering of sound and thus to make them undetectable by imaging systems. Such a coating called as a coating with extended reaction represents a periodic set of small elements with coupling between the neighboring elements. Appropriate choice of the coupling parameters makes its efficiency much higher than that of commonly used coatings. In the present paper it is shown by computer simulation that a rather simple coating of this type can reduce the back?scattered pressure amplitude more than 40 dB (with respect to the rigid cylinder) practically at all frequencies. Considerable reduction of the scattered power can also be achieved in a low frequency range. The width of this range and the reduction index depend on the number of couplings introduced into the coating.

Yuri Bobrovnitskii

2008-01-01T23:59:59.000Z

89

The Impact of Satellite Soundings on the National Meteorological Center's Analysis and Forecast System—The Data Systems Test Results  

Science Journals Connector (OSTI)

In order to assess the value of remote sounding data for numerical weather prediction, parallel sets of analyses were produced with (SAT) and without (NOSAT) the sounding data from the experimental Nimbus-6 and operational NOAA-4 satellites for ...

M. S. Tracton; A. J. Desmarais; R. J. Van Haaren; R. D. McPherson

1980-05-01T23:59:59.000Z

90

Proper Setup of HVAC System in Conjunction with Sound Building 'Skin' Design for Alleviation of IAQ and Energy Performance Problems  

E-Print Network (OSTI)

climates, not only because of the loss of energy, but also because of damage that can result to insulation, drywall, and structure in addition to promotion of mold and mildew growth. Proper setup of the HVAC system, in conjunction with sound building “skin...

Rosenberg, M.

2006-01-01T23:59:59.000Z

91

Sound insulation ratings—the STC revisited  

Science Journals Connector (OSTI)

About twenty years ago building authorities and their acoustical experts were faced with a confusing variety of schemes for rating the sound insulation of walls and floors. There was need for a definitive rating system that would digest the 16 transmission loss values that characterize a partition and produce a single number that would describe its sound insulation performance especially in respect to multi?family dwellings. Two standards committees ISO/TC 43 and ASTM E6 (now E33) began more or less together to develop a new improved rating system to fill this need. The product of these labors was what is known in North America as the ASTM sound transmission class (STC). This rating system was so successful that it was almost universally adopted—even in applications for which it was not intended. Despite the apparent success there is now increasing awareness of imperfections in the system. These are examined in light of accumulated data and experience to see whether the system could or should be improved by certain minor changes.

T. D. Northwood

1981-01-01T23:59:59.000Z

92

System and method for investigating sub-surface features of a rock formation with acoustic sources generating coded signals  

DOE Patents (OSTI)

A system and a method for investigating rock formations includes generating, by a first acoustic source, a first acoustic signal comprising a first plurality of pulses, each pulse including a first modulated signal at a central frequency; and generating, by a second acoustic source, a second acoustic signal comprising a second plurality of pulses. A receiver arranged within the borehole receives a detected signal including a signal being generated by a non-linear mixing process from the first-and-second acoustic signal in a non-linear mixing zone within the intersection volume. The method also includes-processing the received signal to extract the signal generated by the non-linear mixing process over noise or over signals generated by a linear interaction process, or both.

Vu, Cung Khac; Nihei, Kurt; Johnson, Paul A; Guyer, Robert; Ten Cate, James A; Le Bas, Pierre-Yves; Larmat, Carene S

2014-12-30T23:59:59.000Z

93

Acoustic Lexemes for Organizing Internet Audio  

E-Print Network (OSTI)

Acoustic Lexemes for Organizing Internet Audio Michael A. Casey In this article, a method is proposed for automatic fine-scale audio description that draws inspiration from ontological sound automation of audio description at the level of sound objects for indexing and retrieving sound segments

Casey, Michael

94

Puget Sound Operational Forecast System - A Real-time Predictive Tool for Marine Resource Management and Emergency Responses  

SciTech Connect

To support marine ecological resource management and emergency response and to enhance scientific understanding of physical and biogeochemical processes in Puget Sound, a real-time Puget Sound Operational Forecast System (PS-OFS) was developed by the Coastal Ocean Dynamics & Ecosystem Modeling group (CODEM) of Pacific Northwest National Laboratory (PNNL). PS-OFS employs the state-of-the-art three-dimensional coastal ocean model and closely follows the standards and procedures established by National Oceanic and Atmospheric Administration (NOAA) National Ocean Service (NOS). PS-OFS consists of four key components supporting the Puget Sound Circulation and Transport Model (PS-CTM): data acquisition, model execution and product archive, model skill assessment, and model results dissemination. This paper provides an overview of PS-OFS and its ability to provide vital real-time oceanographic information to the Puget Sound community. PS-OFS supports pacific northwest region’s growing need for a predictive tool to assist water quality management, fish stock recovery efforts, maritime emergency response, nearshore land-use planning, and the challenge of climate change and sea level rise impacts. The structure of PS-OFS and examples of the system inputs and outputs, forecast results are presented in details.

Yang, Zhaoqing; Khangaonkar, Tarang; Chase, Jared M.; Wang, Taiping

2009-12-01T23:59:59.000Z

95

Signal processing for fiber optic acoustic sensor system  

E-Print Network (OSTI)

phase compensator. Two passive demodulation techniques based on a 3 by 3 output coupler in the Mach-Zehnder interferometer provide a way to eliminate phase fading suffered inside the interferometric sensors. System measurements utilizing the two...

Zhu, Juhong

2012-06-07T23:59:59.000Z

96

Detection of Volatile Organics Using a Surface Acoustic Wave Array System  

SciTech Connect

A chemical sensing system based on arrays of surface acoustic wave (SAW) delay lines has been developed for identification and quantification of volatile organic compounds (VOCs). The individual SAW chemical sensors consist of interdigital transducers patterned on the surface of an ST-cut quartz substrate to launch and detect the acoustic waves and a thin film coating in the SAW propagation path to perturb the acoustic wave velocity and attenuation during analyte sorption. A diverse set of material coatings gives the sensor arrays a degree of chemical sensitivity and selectivity. Materials examined for sensor application include the alkanethiol-based self-assembled monolayer, plasma-processed films, custom-synthesized conventional polymers, dendrimeric polymers, molecular recognition materials, electroplated metal thin films, and porous metal oxides. All of these materials target a specific chemical fi.mctionality and the enhancement of accessible film surface area. Since no one coating provides absolute analyte specificity, the array responses are further analyzed using a visual-empirical region-of-influence (VERI) pattern recognition algorithm. The chemical sensing system consists of a seven-element SAW array with accompanying drive and control electronics, sensor signal acquisition electronics, environmental vapor sampling hardware, and a notebook computer. Based on data gathered for individual sensor responses, greater than 93%-accurate identification can be achieved for any single analyte from a group of 17 VOCs and water.

ANDERSON, LAWRENCE F.; BARTHOLOMEW, JOHN W.; CERNOSEK, RICHARD W.; COLBURN, CHRISTOPHER W.; CROOKS, R.M.; MARTINEZ, R.F.; OSBOURN, GORDON C.; RICCO, A.J.; STATON, ALAN W.; YELTON, WILLIAM G.

1999-10-14T23:59:59.000Z

97

Low frequency radiation from a (compact) structure with and without sound holes.  

Science Journals Connector (OSTI)

At long wavelengths a force driven closed elastic structure radiates as a dipole. However this may or may not be the case in the presence of a sound hole. Radiation remains dipole?like when the interior volume behaves as an acoustic fluid coupled to the structure. This is commonly referred to as the sound hole sum rule in musical acoustics [Weinreich (1985)]. However should the interior acoustic volume be uncoupled or simply ignored the radiated field is dominated by a monopole contribution. For example this may occur with mechanically isolated piping systems exposed to the exterior medium. In this situation the monopole or dipole nature of the radiation depends on the effective number of sound holes for example whether the driven system is well connected to the exterior along both the inlet and outlet. Finite element structural?acoustic models are developed and exercised to investigate these systems and issues. In addition a substructuring technique is utilized to account for the potential influences of interior structural complexity.

2009-01-01T23:59:59.000Z

98

Sound propagation over Dickins Seamount in the Northeast Pacific Ocean  

Science Journals Connector (OSTI)

The acoustic propagation losses between a 230?Hz cw source and a multi?hydrophone receiving system were measured over Dickins Seamount in the Northeast Pacific. The source was towed at depths of 18 and 184 m. The receiving system had hydrophones spaced in depth from 323 to 633 m. The measurements were made to a maximum range of 130 km with the receiver located at a range of 60 km from the seamount peak. The results show that the seamount cast an acoustic shadow over the receiver increasing the propagation loss by up to 15 dB when the source was shallow and in a position which enabled the seamount to intercept all of the deep refracted source energy. Back reflections from the seamount with levels 6 to 13 dB below the direct signal level were present when the shallow source was 3 to 5 km from the seamount peak. Downslope reflections enhanced the direct signal by up to 10 dB when the shallow source was within 3 km of the peak. Acoustic shadowing and reflection effects were minimal in the results for the deep source because most of the source energy propagated along the sound?channel axis above the seamount peak. The analysis indicates that ray theory is adequate for describing the reflection effects of the acoustic propagation but does not account for all of the acoustic energy in the shadow zone.

Gordon R. Ebbeson; R. Glenn Turner

1983-01-01T23:59:59.000Z

99

Increasing the efficiency of thermoacoustic carbon nanotube sound projectors  

Science Journals Connector (OSTI)

Carbon nanotubes (CNTs) can generate smooth-spectra sound emission over a wide frequency range (1–105 Hz) by means of thermoacoustics (TA). However, in the low frequencies f, where the need for large area sound projectors is high, the sound generation efficiency ? of open CNT sheets is low, since ? ? f2. Together with this problem, the nanoscale thickness of CNT sheets, their high sensitivity to the environment and the high surface temperatures useful for TA sound generation are other drawbacks, which we address here by protective encapsulation of free-standing CNT sheets in inert gases. We provide an extensive experimental study of such closed systems for different thermodynamic regimes and rationalize our observations within a basic theoretical framework. The observed sound pressure levels for encapsulated argon filled TA transducers (130 dB in air and 200 dB underwater in the near field at 5 cm distance, and 100 and 170 dB in the far field at 1 m distance) are Q times higher than those for open systems, where Q is the resonant quality factor of the thin enclosure plates. Moreover, the sound generation efficiency of the encapsulated system increases toward low frequencies (? ? 1/f2). Another method to increase ? in the low frequency region is by modulation of the applied high frequency carrier current with a low frequency resonant envelope. This approach enables sound generation at the frequency of the applied current without the need for additional energy-consuming biasing. The acoustical and geometrical parameters providing further increases in efficiency and transduction performance for resonant systems are discussed.

Ali E Aliev; Yuri N Gartstein; Ray H Baughman

2013-01-01T23:59:59.000Z

100

Building Energy Software Tools Directory: AcousticCalc  

NLE Websites -- All DOE Office Websites (Extended Search)

AcousticCalc AcousticCalc Developed over the last decade, AcousticCalc helps designers predict sound levels at the room level from a distant sound source. The program uses the ASHRAE Handbook and ASHRAE's 1991 Algorithms for HVAC Acoustics handbook methods with the "Source-Path-Receiver" model. This easy-to-use Windows-based program allows a user to define and save unlimited number of sound sources, save and define unlimited number of sound "paths" (composed of long list of possible duct component types) and model the ceiling effect and three different models for room effect. AcousticCalc allows a user to import and export (share) sound sources, user-defined devices, terminal units, and duct silencers with other users. Easy-to-navigate "tree" modeling allows an unlimited number of sound

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


101

Active acoustic monitoring systems for detecting, localizing, tracking, and classifying marine mammals and fish.  

Science Journals Connector (OSTI)

Detection localization tracking and classification (DLTC) of marine mammals and fish is necessary for a wide range of bioacoustic studies. This includes those related to understanding anthropogenic effects and to the development of methods for mitigating harm. Active acoustic monitoring (AAM) is a robust method for monitoring marine life as it can detect and accurately localize a silent target enabling full DLTC. With the growth of the offshore renewable energy industry and the need to mitigate harm from pile driving seismic surveys and military sonar operations there is strong interest in developing AAM systems and integrating them with current mitigation techniques. There are a host of significant issues including the standard sonar problems of reverberation and propagation in high?clutter shallow water environments false alarms classification methods of deployment and cost. Furthermore AAM systems transmit acoustic energy that has the potential to disturb marine life. Much work lies ahead to develop systems that balance the risks benefits performance and costs. This paper will review the status and issues of AAM systems. This includes a discussion of implemented near?field (imaging) and far?field (tracking) systems experimental results and plans for further development testing integration and permitting.

Peter J. Stein

2011-01-01T23:59:59.000Z

102

Sound Sightings  

Science Journals Connector (OSTI)

...possible to find the cause of a decline in salmon that hatch in the Columbia River, notes Ben Zelinsky of the Bonneville Power Administration in Portland, Oregon. Ready to transmit. A biologist implants an acoustic tag into an anesthetized salmon...

Constance Holden

2006-08-11T23:59:59.000Z

103

Toward a global observation and modeling system for studying the ecology of the open ocean using acoustics.  

Science Journals Connector (OSTI)

The CLIOTOP (mid?trophic automatic acoustic sampling) project and the EurOcean consortium are organizing a workshop in May 2011 in Bergen Norway. The presentation will summarize the discussions and conclusions from the workshop. The workshop will deal with the technological and modeling issues related to the mass deployment of acoustic sensors in the open ocean environment. The technological challenges that will be addressed are plans and concepts for novel platforms carrying acoustics and complementary techniques energy supply and consumption and data transfer technology. Presently acoustics cannot provide measures of the species?specific biomass of all taxa and complementary technologies and ecosystemmodels need to be tailored to the available data. The modeling part of the workshop will focus mainly on the model?data links. It will cover the topics required to design a large scale observational system and to improve the combination of models and observations through data assimilation. The use of acoustic data in marine ecosystemmodels is indeed often done in a fairly naive way typically by assuming that acoustic measurements can provide acute and precise estimates of biomass. This leads to underestimated uncertainty and potentially biased results which need to be rigorously addressed in appropriate state?space frameworks.

Nils Olav Handegard; Geir Huse; Olivier Maury; Nils Christian Stenseth

2011-01-01T23:59:59.000Z

104

Acoustic Character Of Hydraulic Fractures In Granite  

E-Print Network (OSTI)

Hydraulic fractures in homogeneous granitic rocks were logged with conventional acoustic-transit-time, acoustic-waveform, and acoustic-televiewer logging systems. Fractured intervals ranged in depth from 45 to 570m. and ...

Paillet, Frederick I.

1983-01-01T23:59:59.000Z

105

Acoustic Performance of an Installed Real-Time Three-Dimensional Audio System  

Science Journals Connector (OSTI)

The Exterior Effects Room (EER) located at the NASA Langley Research Center is a facility built for psychoacoustic studies of aircraft community noise. Recently the EER was significantly upgraded to allow for simulation of aircraft flyovers in a three-dimensional audio and visual environment. The upgrade included installation of 27 satellite and 4 subwoofer loudspeakers that are driven by a real-time audio server. The audio server employs an implementation of the Vector Base Amplitude Panning (VBAP) method to position virtual sources at arbitrary azimuth and elevation angles in the EER. Real-time application of filters time delays and gains are required to compensate for installation effects including those associated with the irregular room geometry colorization due to varying loudspeaker installations and crossover filtering. The authors previously showed [J. Acoust. Soc. Am. 127 1969 (2010)] that color compensation and crossover filtering could be achieved for satellite and subwoofer loudspeakers. However the resulting FIR filters were too long (32 768 taps) to implement in real-time. The focus of this work is on development of reduced-length surrogate IIR filters and on measurement of the acoustic performance of the installed real-time system.

Kenneth Faller II; Stephen A. Rizzi; Noah Schiller; Randolph Cabell; Jacob Klos; William L. Chapin; Aric R. Aumann

2012-01-01T23:59:59.000Z

106

Acoustic performance of an installed real?time three?dimensional audio system.  

Science Journals Connector (OSTI)

The Exterior Effects Room (EER) located at the NASA Langley Research Center is a facility built for psychoacoustic studies of aircraft community noise. Recently the EER was significantly upgraded to allow for simulation of aircraft flyovers in a 3?D audio and visual environment. The upgrade included installation of 27 satellite and 4 subwooferloudspeakers that are driven by a real?time audio server. The audio server employs an implementation of the vector base amplitude panning method to position virtual sources at arbitrary azimuth and elevation angles in the EER. Real?time application of filters time delays and gains are required to compensate for installation effects including those associated with the irregular room geometry colorization due to varying loudspeaker installations and crossover filtering. The authors previously showed [J. Acoust. Soc. Am. 127 1969 (2010)] that color compensation and crossover filtering could be achieved for satellite and subwooferloudspeakers. However the resulting FIR filters were too long (32?768 taps) to implement in real?time. The focus of this work is on the development of reduced?length surrogate IIR filters and on the measurement of the acoustic performance of the installed real?time system.?

Kenneth J. Faller II; Stephen A. Rizzi; Noah Schiller; Randolph H. Cabell; Jacob Klos; William L. Chapin; Fahri Surucu

2010-01-01T23:59:59.000Z

107

Acoustical criteria in a two?parameter system for evaluating impact noise insulation.  

Science Journals Connector (OSTI)

Experience indicates that impact noise complaints in multi?family joist?framed buildings fall into two broad classes: low frequency thudding from footfalls and mid? to high frequency noise from heel clicks dragging furniture etc. The authors have developed a two?parameter system for evaluating impact noise [LoVerde and Dong J. Acoust. Soc. Am. 119 3220 (2006); 120 3206 (2006); 122 2954 (2007)] that offers considerable improvement over existing metrics (such as FIIC) in terms of both correlation with subjective reaction and comparison of materials intended for improving impact insulation. Based on this system suggested criteria for impact noise levels are presented. The effects of various design parameters on noise levels are discussed.

2009-01-01T23:59:59.000Z

108

Acoustic monitoring and signature analysis in nuclear and fossil energy generation  

Science Journals Connector (OSTI)

Acoustic monitoring and analysis in nuclear and fossil energy plants has been accompanied by transducer development for the hot environment. The Nuclear Regulatory Commission requires acoustic monitoring systems on nuclear reactors for detecting potential failures. Accelerometers are attached at critical points and their output is automatically analyzed to give warnings of loose parts or excessive vibration. In addition to providing a warning the system can monitor arrival time to be used for fault location. For use as a potential boiling detector of breeder reactors the acoustic signature of the sodium coolant boiling has been compared with background noise level. High temperature sodium?immersible microphones and waveguides for smooth energy transfer were developed for this investigation. High?temperature acoustic sensors have been used in a coal gasification plant. The presence of solids in a steam?char line has been automatically determined using passive monitoring of relative sound intensities of different frequency bands.

Henry B. Karplus

1982-01-01T23:59:59.000Z

109

Multiphase fluid characterization system  

DOE Patents (OSTI)

A measurement system and method for permitting multiple independent measurements of several physical parameters of multiphase fluids flowing through pipes are described. Multiple acoustic transducers are placed in acoustic communication with or attached to the outside surface of a section of existing spool (metal pipe), typically less than 3 feet in length, for noninvasive measurements. Sound speed, sound attenuation, fluid density, fluid flow, container wall resonance characteristics, and Doppler measurements for gas volume fraction may be measured simultaneously by the system. Temperature measurements are made using a temperature sensor for oil-cut correction.

Sinha, Dipen N.

2014-09-02T23:59:59.000Z

110

Implosion sound  

Science Journals Connector (OSTI)

An open end axisymmetrical cavity is used to study the generation of implosion sound. The cross section of the cavity’s profile has a shape which will distort the wave front of a plane shock wave converging it into a single point. Hence a spherical collapsing phenomenon can be approximately achieved when a shock wave propagates into the opening of this finite size artificial cavity. Through the shock and shock interference mechanism a strong impulse therefore is generated at the focal point caused by the pressure difference between the inside and outside of the cavity. This highly localized impulse then is radiated out from the opening of the cavity as a sound projector. A prototype model of 0.5 l size has been constructed and tested in the laboratory. The preliminary experimental results indicated that this device can reach a peak sound pressure level of 146 dB//20 ?Pa in air and 185 dB//30 ?Pa in water with an ambient pressure of 1 atmosphere (1 bar). The 50% pulse width is about 20 and 30 ?s for air and water respectively. Analysis and application of this type of sound projector will be discussed.

Nai?chyuan Yen

1995-01-01T23:59:59.000Z

111

Research on ponderomotive driven Vlasov–Poisson system in electron acoustic wave parametric region  

SciTech Connect

Theoretical analysis and corresponding 1D Particle-in-Cell (PIC) simulations of ponderomotive driven Vlasov–Poisson system in electron acoustic wave (EAW) parametric region are demonstrated. Theoretical analysis identifies that under the resonant condition, a monochromatic EAW can be excited when the wave number of the drive ponderomotive force satisfies 0.26?k{sub d}?{sub D}?0.53. If k{sub d}?{sub D}?0.26, nonlinear superposition of harmonic waves can be resonantly excited, called kinetic electrostatic electron nonlinear waves. Numerical simulations have demonstrated these wave excitation and evolution dynamics, in consistence with the theoretical predictions. The physical nature of these two waves is supposed to be interaction of harmonic waves, and their similar phase space properties are also discussed.

Xiao, C. Z.; Huang, T. W. [HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871 (China)] [HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871 (China); Liu, Z. J.; Zheng, C. Y.; He, X. T. [HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871 (China) [HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871 (China); Institute of Applied Physics and Computational Mathematics, Beijing 100094 (China); Qiao, B. [HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871 (China) [HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871 (China); School of Physics, Peking University, Beijing 100871 (China)

2014-03-15T23:59:59.000Z

112

Schlumberger soundings, audio-magnetotelluric soundings and telluric  

Open Energy Info (EERE)

soundings, audio-magnetotelluric soundings and telluric soundings, audio-magnetotelluric soundings and telluric mapping in and around the Coso Range, California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Schlumberger soundings, audio-magnetotelluric soundings and telluric mapping in and around the Coso Range, California Details Activities (4) Areas (2) Regions (0) Abstract: Results of geophysical surveys in and around the Coso Range, and in particular in the area surrounding Coso Hot Springs are reported. Electrical properties of rocks associated with thermal phenomena of the Devil's Kitchen-Coso Hot Springs area in the Coso rhyolite dome field and the large arcuate fracture system previously postulated to represent a stage of incipient caldera formation were studied. Six individual plates

113

Method for chemically analyzing a solution by acoustic means  

DOE Patents (OSTI)

A method and apparatus are disclosed for determining a type of solution and the concentration of that solution by acoustic means. Generally stated, the method consists of: immersing a sound focusing transducer within a first liquid filled container; locating a separately contained specimen solution at a sound focal point within the first container; locating a sound probe adjacent to the specimen, generating a variable intensity sound signal from the transducer; measuring fundamental and multiple harmonic sound signal amplitudes; and then comparing a plot of a specimen sound response with a known solution sound response, thereby determining the solution type and concentration. 10 figs.

Beller, L.S.

1997-04-22T23:59:59.000Z

114

Method for chemically analyzing a solution by acoustic means  

DOE Patents (OSTI)

A method and apparatus for determining a type of solution and the concention of that solution by acoustic means. Generally stated, the method consists of: immersing a sound focusing transducer within a first liquid filled container; locating a separately contained specimen solution at a sound focal point within the first container; locating a sound probe adjacent to the specimen, generating a variable intensity sound signal from the transducer; measuring fundamental and multiple harmonic sound signal amplitudes; and then comparing a plot of a specimen sound response with a known solution sound response, thereby determining the solution type and concentration.

Beller, Laurence S. (Idaho Falls, ID)

1997-01-01T23:59:59.000Z

115

On the sound field from a moving source in a viscous medium Michael J. Buckinghama)  

E-Print Network (OSTI)

for measuring the speed of sound in a marine sediment. The acoustic coupling across the air­sea interface, southern California6,7 in which a propeller-driven light aircraft was used as an acoustic source to the speed of sound in the local medium where the receiver is located, that is, the sedi- ment in the case

Buckingham, Michael

116

E-Print Network 3.0 - acoustic charge transport Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

. This acoustic turbidity is caused by a layer of subsurface gas, which prohibits the identification of geological... structures below that gas layer. Sound speeds were...

117

On the Propagation of Sound in the Free Atmosphere and the Acoustic Efficiency of Fog-Signal Machinery: An Account of Experiments Carried out at Father Point, Quebec, September, 1913  

Science Journals Connector (OSTI)

...Free Atmosphere and the Acoustic Efficiency of Fog-Signal Machinery: An Account of Experiments Carried out at Father Point, Quebec, September, 1913 Louis Vessot King The Royal Society is collaborating with JSTOR to digitize, preserve, and extend access...

1919-01-01T23:59:59.000Z

118

Analysis of an arrayed acoustic listening system for sperm whale studies  

E-Print Network (OSTI)

Concern for the preservation of cetacean habitats has created the need for survey methods which can cover large ocean areas and provide accurate estimates of population density and abundance. Between the years of 1991 and 1996 passive acoustic...

Duncan, Michael Eric

2012-06-07T23:59:59.000Z

119

Behavioral reactions of cod and sole to playback of pile driving sound.  

Science Journals Connector (OSTI)

The effect of anthropogenic underwater sound on fish has become an important environmental issue. Pile?driving noise during construction is of particular concern as the very high sound pressure levels could potentially prevent fish from reaching breeding or spawning sites finding food and acoustically locating mates. This could result in long?term effects on reproduction and populationparameters. Additionally avoidance reactions might result in displacement away from potential fishing grounds and lead to reduced catches. However reaction thresholds and therefore the impacts of pile driving on the behavior of fish are completely unknown. Pile?driving noise was played back to cod and sole held in two large (40 m) net pens located in a quiet bay. Movements of the fish were analyzed using a novel acoustic tracking system. Received sound pressure level and particle motion were measured during the experiments. The results show significant movement responses to the pile?driving stimulus in both species at relatively low received sound pressure levels. This might indicate a rather large area of avoidance during real pile?driving operations. The results of the study have important implications on regulatory advice and the implementation of mitigation measures in the construction of offshore wind farms.

Christina Mueller?Blenkle; Andrew B. Gill; Peter K. McGregor; Julian Metcalfe; Victoria Bendall; Daniel Wood; Mathias H. Andersson; Peter Sigray; Frank Thomsen

2010-01-01T23:59:59.000Z

120

NW-MILO Acoustic Data Collection  

SciTech Connect

There is an enduring requirement to improve our ability to detect potential threats and discriminate these from the legitimate commercial and recreational activity ongoing in the nearshore/littoral portion of the maritime domain. The Northwest Maritime Information and Littoral Operations (NW-MILO) Program at PNNL’s Coastal Security Institute in Sequim, Washington is establishing a methodology to detect and classify these threats - in part through developing a better understanding of acoustic signatures in a near-shore environment. The purpose of the acoustic data collection described here is to investigate the acoustic signatures of small vessels. The data is being recorded continuously, 24 hours a day, along with radar track data and imagery. The recording began in August 2008, and to date the data contains tens of thousands of signals from small vessels recorded in a variety of environmental conditions. The quantity and variety of this data collection, with the supporting imagery and radar track data, makes it particularly useful for the development of robust acoustic signature models and advanced algorithms for signal classification and information extraction. The underwater acoustic sensing system is part of a multi-modal sensing system that is operating near the mouth of Sequim Bay. Sequim Bay opens onto the Straight of Juan de Fuca, which contains part of the border between the U.S. and Canada. Table 1 lists the specific components used for the NW-MILO system. The acoustic sensor is a hydrophone permanently deployed at a mean depth of about 3 meters. In addition to a hydrophone, the other sensors in the system are a marine radar, an electro-optical (EO) camera and an infra-red (IR) camera. The radar is integrated with a vessel tracking system (VTS) that provides position, speed and heading information. The data from all the sensors is recorded and saved to a central server. The data has been validated in terms of its usability for characterizing the signatures of small vessels. The sampling rate of 8 kHz and low pass filtering to 2 kHz results in an alias-free signal in the frequency band that is appropriate for small vessels. Calibration was performed using a Lubell underwater speaker so that the raw data signal levels can be converted to sound pressure. Background noise is present due to a nearby pump and as a result of tidal currents. More study is needed to fully characterize the noise, but it does not pose an obstacle to using the acoustic data for the purposes of vessel detection and signature analysis. The detection range for a small vessel was estimated using the calibrated voltage response of the system and a cylindrical spreading model for transmission loss. The sound pressure of a typical vessel with an outboard motor was found to be around 140 dB mPa, and could theoretically be detected from 10 km away. In practical terms, a small vessel could reliably be detected from 3 - 5 km away. The data is archived in netCDF files, a standard scientific file format that is "self describing". This means that each data file contains the metadata - timestamps, units, origin, etc. - needed to make the data meaningful and portable. Other file formats, such as XML, are also supported. A visualization tool has been developed to view the acoustic data in the form of spectrograms, along with the coincident radar track data and camera images.

Matzner, Shari; Myers, Joshua R.; Maxwell, Adam R.; Jones, Mark E.

2010-02-17T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Method and system for generating a beam of acoustic energy from a borehole, and applications thereof  

DOE Patents (OSTI)

A compact array of transducers is employed as a downhole instrument for acoustic investigation of the surrounding rock formation. The array is operable to generate simultaneously a first acoustic beam signal at a first frequency and a second acoustic beam signal at a second frequency different than the first frequency. These two signals can be oriented through an azimuthal rotation of the array and an inclination rotation using control of the relative phases of the signals from the transmitter elements or electromechanical linkage. Due to the non-linearity of the formation, the first and the second acoustic beam signal mix into the rock formation where they combine into a collimated third signal that propagates in the formation along the same direction than the first and second signals and has a frequency equal to the difference of the first and the second acoustic signals. The third signal is received either within the same borehole, after reflection, or another borehole, after transmission, and analyzed to determine information about rock formation. Recording of the third signal generated along several azimuthal and inclination directions also provides 3D images of the formation, information about 3D distribution of rock formation and fluid properties and an indication of the dynamic acoustic non-linearity of the formation.

Johnson Paul A. (Santa Fe, NM); Ten Cate, James A. (Los Alamos, NM); Guyer, Robert (Reno, NV); Le Bas, Pierre-Yves (Los Alamos, NM); Vu, Cung (Houston, TX); Nihei, Kurt (Oakland, CA); Schmitt, Denis P. (Katy, TX); Skelt, Christopher (Houston, TX)

2012-02-14T23:59:59.000Z

122

Role of acoustical technology in the development of new energy sources  

Science Journals Connector (OSTI)

During the past five years considerable progress has been made in the control and abatement of excessive and/or harmful noise as well as vibration associated with the transportation construction and industrial activities and systems. This has been a definite contribution of acoustics towards improving the quality of our environment and community life alike. A similar kind of concerted effort is required whereby the know1edge of acoustics can be advantageously utilized in the development of much?needed new energy sources. Among the more challenging acoustical technologies available during exploration detection and identification of new conventional and non?conventional energy sources are those utilizing ultrasonic electroacoustics underwater acoustics and geoacoustics principles and/or disciplines. For example echo?sounding has been effectively used in the detection and assessment of marine resources. In the same way acousti?coring and seismic reflection techniques have been successfully employed during the exploration and detection phases associated with “mining geology” and “marine sediments.” However the most attractive area of new energy source development where acoustical technology can best be utilized appears to be in the exploration of active "geothermal" sites. The ground noise(seismic)measurements utilizing sensitive and precision acoustical instrumentation can tremendously accelerate development of this important untapped and nonpolluting form of natural energy. This paper reviews the interaction of acoustics with new energy resource development programs.

A. G. Jhaveri

1975-01-01T23:59:59.000Z

123

Getting it together—Interdisciplinary sound environment research  

Science Journals Connector (OSTI)

The Sound Environment Center at Lund university is an interdisciplinary center created to coordinate research on sound and soundscape issues and is known to be the first of its kind worldwide. Ranging from acoustics to medicine psychology and cognitive sciences as well as humanities like musicology and linguistics soundscape research adresses many interdependent areas and touches upon health as well as philosophical aesthetic and technical issues. To get a holistic comprehension these perspectives need to be synchronized. Therefore the center has an interdisciplinary board and a mission to study sound environments from multidisciplinary perspectives. Focus lies on research and contact between researchers. The center has external funding for larger research collaborations on topics such as teachers voice strain and rooms acoustics health effects of combined exposure to noise and airborne particles cognition and sound exposure. In addition to initiating research projects the center arranges symposiums adressing topics such as Noise and health Seductive Sounds Operational Sounds Dangerous Sounds' and Sound Cognition and Learning. Further topics have been Sound Design Sounds and Silence for Mental Recreation Teachers Voice Comfort and recently Wind TurbineNoise. The symposiums facilitates cross disciplinary contacts and discussions many of them producing published papers and reports.

Frans Mossberg

2011-01-01T23:59:59.000Z

124

Doppler effect reduction based on time-domain interpolation resampling for wayside acoustic defective bearing detector system  

Science Journals Connector (OSTI)

Abstract In the wayside Acoustic Defective Bearing Detector (ADBD) system, the recorded acoustic signal will be severely distorted by the Doppler effect because of the high moving speed of the railway vehicle, which is a barrier that would badly reduce the effectiveness of online defect detection. This paper proposes a simple and effective method, called time-domain interpolation resampling (TIR), to remove the Doppler effect embedded in the acoustic signal. The TIR is conducted in three steps. First, the time vector for resampling is calculated according to the kinematic analysis. Second, the amplitude of the distorted signal is demodulated. Third, the distorted signal is re-sampled using spline interpolation. In this method, both the spectrum structure and the amplitudes of the distorted signal can be restored. The effectiveness of TIR is verified by means of simulation studies and train roller bearing experiments with various types of defects. It is also compared to an existing Doppler effect reduction method that is based on the instantaneous frequency estimation using Hilbert transform. Results indicate that the proposed TIR method has the superior performance in removing the Doppler effect, and can be well implemented to Doppler effect reduction for the ADBD system.

Fang Liu; Qingbo He; Fanrang Kong; Yongbin Liu

2014-01-01T23:59:59.000Z

125

Determination of sound power of coupled machines  

Science Journals Connector (OSTI)

Several procedures are available for the determination of the sound power level of machines in normal environments. Most of these give adequate results for single medium?sized equipment but difficulties arise in extending the concepts to large coupled machines. [“Evaluation of Proposed ASME PTC 36 Code for Sound Power Level Determination of Large Steam Turbine Generators ” S.E. Grabkowski J. MacDonald and T. Van Schaick (General Electric Company) to be presented at Fall 1975 ASME meeting.] Much of the problem is because the direct acoustic field of a component machine may not extend to as much as one foot from its surface due to reverberation from other components. A procedure is suggested in which all acoustic measurements are confined to surfaces near each component machine. Correction is made for the reverberant acoustic field of the entire environment. The correction procedure utilizes reverberation time determinations from impulsive noise tests; and applies a Monte Carlo approach to the problem of correcting for nearfield effects in the evaluation of sound power. An iterative computation is employed. Comparisons with free?field sound power determinations are shown.

R. J. Wells

1975-01-01T23:59:59.000Z

126

Assessment of Energy Storage Alternatives in the Puget Sound Energy System  

SciTech Connect

As part of an ongoing study co-funded by the Bonneville Power Administration, under its Technology Innovation Grant Program, and the U.S. Department of Energy, the Pacific Northwest National Laboratory (PNNL) has developed an approach and modeling tool for assessing the net benefits of using energy storage located close to the customer in the distribution grid to manage demand. PNNL in collaboration with PSE and Primus Power has evaluated the net benefits of placing a zinc bromide battery system at two locations in the PSE system (Baker River / Rockport and Bainbridge Island). Energy storage can provide a number of benefits to the utility through the increased flexibility it provides to the grid system. Applications evaluated in the assessment include capacity value, balancing services, arbitrage, distribution deferral and outage mitigation. This report outlines the methodology developed for this study and Phase I results.

Balducci, Patrick J.; Jin, Chunlian; Wu, Di; Kintner-Meyer, Michael CW; Leslie, Patrick; Daitch, Charles

2013-12-12T23:59:59.000Z

127

An Inversion of Acoustical Attenuation Measurements to Deduce Bubble Populations  

Science Journals Connector (OSTI)

Measurement of natural bubble populations is required for many areas of ocean science. Acoustical methods have considerable potential for achieving this goal because bubbles scatter sound strongly close to their natural frequency, which depends ...

H. Czerski

2012-08-01T23:59:59.000Z

128

Acoustic privacy and health care.  

Science Journals Connector (OSTI)

Acoustic privacy can be differentiated into two categories: freedom from intrusive noise such as a person snoring or wheezing in the next bed traffic outside the windows carts in the hallways and footsteps on the floor above; and speech privacy—the freedom from being overheard and of overhearing others. Providing the proper acoustical environment and the protecting privacy must be a joint effort between the facility designers and hospital staff. A brief discussion of the basic requirements for speech privacy and HIPAA privacy and a quality background sound will be presented.

Neil Moiseev

2010-01-01T23:59:59.000Z

129

A Cabled Acoustic Telemetry System for Detecting and Tracking Juvenile Salmon: Part 2. Three-Dimensional Tracking and Passage Outcomes  

SciTech Connect

In Part 1 of this paper [1], we presented the engineering design and instrumentation of the Juvenile Salmon Acoustic Telemetry System (JSATS) cabled system, a nonproprietary technology developed by the U.S. Army Corps of Engineers, Portland District, to meet the needs for monitoring the survival of juvenile salmonids through the 31 dams in the Federal Columbia River Power System. Here in Part 2, we describe how the JSATS cabled system was employed as a reference sensor network for detecting and tracking juvenile salmon. Time-of-arrival data for valid detections on four hydrophones were used to solve for the three-dimensional (3D) position of fish surgically implanted with JSATS acoustic transmitters. Validation tests demonstrated high accuracy of 3D tracking up to 100 m from the John Day Dam spillway. The along-dam component, used for assigning the route of fish passage, had the highest accuracy; the median errors ranged from 0.06 to 0.22 m, and root mean square errors ranged from 0.05 to 0.56 m at distances up to 100 m. For the case study at John Day Dam during 2008, the range for 3D tracking was more than 100 m upstream of the dam face where hydrophones were deployed, and detection and tracking probabilities of fish tagged with JSATS acoustic transmitters were higher than 98%. JSATS cabled systems have been successfully deployed on several major dams to acquire information for salmon protection and for development of more “fish-friendly” hydroelectric facilities.

Deng, Zhiqun; Weiland, Mark A.; Fu, Tao; Seim, Thomas A.; Lamarche, Brian L.; Choi, Eric Y.; Carlson, Thomas J.; Eppard, Matthew B.

2011-05-26T23:59:59.000Z

130

The sound quality of vehicle interior noise: a challenge for the NVH-engineers  

Science Journals Connector (OSTI)

The sound quality of vehicle interior noise has become a very important task for the acoustic engineers since more than 20 years. As vehicles become more and more quiet, the customer's sensitiveness for the acoustical comfort increases. On the one hand, no disturbing noises should be heard and on the other hand, the perceived sound quality, for example from the powertrain, should fulfill the expectations of the listener with respect to the sound design. The development of a good sound quality is in conflict with other targets. The development time of a new car has to be reduced and the production costs have to be lower, the total weight of the car should not increase â?? without any negative influence on the sound quality. For the acoustical engineer it becomes important to know what kind of tools are available to measure, to analyse and to describe sound quality on the one hand and how to improve it on the other hand.

Klaus Genuit

2004-01-01T23:59:59.000Z

131

Reflective echo tomographic imaging using acoustic beams  

DOE Patents (OSTI)

An inspection system includes a plurality of acoustic beamformers, where each of the plurality of acoustic beamformers including a plurality of acoustic transmitter elements. The system also includes at least one controller configured for causing each of the plurality of acoustic beamformers to generate an acoustic beam directed to a point in a volume of interest during a first time. Based on a reflected wave intensity detected at a plurality of acoustic receiver elements, an image of the volume of interest can be generated.

Kisner, Roger; Santos-Villalobos, Hector J

2014-11-25T23:59:59.000Z

132

The influence of mesoscale eddies on shallow water acoustic propagation  

Science Journals Connector (OSTI)

Acoustic propagation measurements in 150 m depth on the Florida escarpment observe the effects of the passage of a cyclonic eddy. As the stream core of the Florida Current meanders the eddy is formed and propagates along the shelf edge. The sequence over a roughly a fortnight is as follows: ahead of the eddy warm surface water and cold bottom water are swept onto the terrace forming a steep thermocline and corresponding strong downward refracting C(z). The gradient produce intense focused RBR arrivals and the thermocline becomes a duct for internal waves to propagate shoreward. At first the internal wave energy is minimal and propagation is stable and coherent. As the internal tides attempt to propagate on shelf the sound speed field and the acoustic signals become increasingly variable. The variability reaches a crescendo as the 200 m long internal tide is blocked from propagating on to the narrower shelf and begins to break and overturn producing small?scale variability. As the eddy passes nearly iso?thermal conditions are restored along with quiescent internal wave fields and reduced signal variability. Here the effects are quantized with data from fixed?system acoustic and oceanographic measurements demonstrating that the mesoscale determines acoustic propagation conditions days in advance.

2003-01-01T23:59:59.000Z

133

15 Acoustic Daylight Imaging in the Michael J. Buckingham  

E-Print Network (OSTI)

of radiation, including light. Acoustic techniques are thus a pre- ferred choice for probing the ocean depths. Two types of acoustic sys- tems, passive sonar and active sonar, are commonly used as detection devices in the ocean [1]. A passive sonar simply listens for the sound radiated by a target

Buckingham, Michael

134

System for generating a beam of acoustic energy from a borehole, and applications thereof  

DOE Patents (OSTI)

In some aspects of the invention, a device, positioned within a well bore, configured to generate and direct an acoustic beam into a rock formation around a borehole is disclosed. The device comprises a source configured to generate a first signal at a first frequency and a second signal at a second frequency; a transducer configured to receive the generated first and the second signals and produce acoustic waves at the first frequency and the second frequency; and a non-linear material, coupled to the transducer, configured to generate a collimated beam with a frequency equal to the difference between the first frequency and the second frequency by a non-linear mixing process, wherein the non-linear material includes one or more of a mixture of liquids, a solid, a granular material, embedded microspheres, or an emulsion.

Vu, Cung Khac; Sinha, Dipen N.; Pantea, Cristian; Nihei, Kurt T.; Schmitt, Denis P.; Skelt, Christopher

2012-09-04T23:59:59.000Z

135

System for generating a beam of acoustic energy from a borehole, and applications thereof  

DOE Patents (OSTI)

In some aspects of the invention, a device, positioned within a well bore, configured to generate and direct an acoustic beam into a rock formation around a borehole is disclosed. The device comprises a source configured to generate a first signal at a first frequency and a second signal at a second frequency; a transducer configured to receive the generated first and the second signals and produce acoustic waves at the first frequency and the second frequency; and a non-linear material, coupled to the transducer, configured to generate a collimated beam with a frequency equal to the difference between the first frequency and the second frequency by a non-linear mixing process, wherein the non-linear material includes one or more of a mixture of liquids, a solid, a granular material, embedded microspheres, or an emulsion.

Vu, Cung Khac (Houston, TX); Sinha, Dipen N. (Los Alamos, NM); Pantea, Cristian (Los Alamos, NM); Nihei, Kurt T. (Oakland, CA); Schmitt, Denis P. (Katy, TX); Skelt, Christopher (Houston, TX)

2012-07-31T23:59:59.000Z

136

Outdoor sound propagation in the U.S. Civil War  

Science Journals Connector (OSTI)

In a number of major battles in the U.S. Civil War unusual atmospheric acoustics played a major role. In this study the probable causes of the unusual acoustics are given and the resulting effect on military command decisions is described. The causes discussed include sound absorption wind shear temperature gradients and combinations of these. Several cases will also be described in which multiple ground reflections caused sounds of battle to be heard at unusually great distances. The battles studied include Gettysburg Seven Pines Perryville Iuka Fort Donelson Gaines Mill Five Forks and Chancellorsville.

Charles D. Ross

1998-01-01T23:59:59.000Z

137

Modern Schoolroom Acoustics  

Science Journals Connector (OSTI)

Many teachers are faced with conducting classes in buildings that were obsolete thirty years ago. Others are or soon will be teaching in new schools which are in no way modern in some of their basic construction details. A classroom laboratory or auditorium is fundamentally a shelter in which the basic functions are seeing and hearing. Daylight provides satisfactory seeing a large part of the time. In spite of this about $1.50 per square foot is the average investment for auxiliary lighting while satisfactory acoustics is often completely overlooked or is the target of severe economy measures. Architects today are often eliminating or seriously compromising on the acoustical treatment expenditure while spending lavishly for less important materials. Eighty?five percent articulation will usually result in satisfactory hearing for adults because the context supplies the transitional ties. For children however especially the very young each word and every syllable is important. Excessive reverberation time or poor sound distribution may create conditions which seriously handicap the students and teachers alike. Modern medical methods have shown that poor eyes and poor hearing are often responsible for backward children who are really average or above average in mental ability. It is inexcusable to add to their natural handicaps those of poor architecture and poor engineering. Good acoustics is as fundamental as lighting and ventilation and much more attention should be paid to this phase of school design.

L. F. Yerges; M. A. Smith

1949-01-01T23:59:59.000Z

138

Error analysis of pose measurement from sonic sensors without using speed of sound information  

E-Print Network (OSTI)

Scott Burnett (1) demonstrated the feasibility of using acoustic sensors to locate an object without information about speed of sound. The algorithms of triangulation and pose measurement, which were introduced in his paper to fulfill the goal...

Lai, Chih-Chien

2012-06-07T23:59:59.000Z

139

Phased Array Ultrasonic Sound Field Mapping in Cast Austenitic Stainless Steel  

SciTech Connect

This study maps the phased array-generated acoustic sound fields through three types of CASS microstructure in four specimens to quantitatively assess the beam formation effectiveness in these materials.

Crawford, Susan L.; Prowant, Matthew S.; Cinson, Anthony D.; Larche, Michael R.; Diaz, Aaron A.; Anderson, Michael T.

2014-05-31T23:59:59.000Z

140

Inversion for subbottom sound velocity profiles in the deep and shallow ocean  

E-Print Network (OSTI)

This thesis investigates the application of acoustic measurements in the deep and shallow ocean to infer the sound velocity profile (svp) in the seabed. For the deep water ocean, an exact method based on the Gelfand-Levitan ...

Souza, Luiz Alberto Lopes de

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Measurement of sound speed vs. depth in South Pole ice: pressure waves and shear waves  

E-Print Network (OSTI)

Price, Attenuation of acoustic waves in glacial ice and saltacoustics, South Pole, sound speed, pressure waves,shear waves PACS: 47.35.De, 47.35.Rs, 62.65. +k, 92.40.Vq,

Klein, Spencer

2010-01-01T23:59:59.000Z

142

Neural correlates and mechanisms of sound localization in everyday reverberant settings  

E-Print Network (OSTI)

Nearly all listening environments-indoors and outdoors alike-are full of boundary surfaces (e.g., walls, trees, and rocks) that produce acoustic reflections. These reflections interfere with the direct sound arriving at a ...

Devore, Sasha

2009-01-01T23:59:59.000Z

143

Acoustic pursuit of invisible moving targets by cats  

Science Journals Connector (OSTI)

Head movements evoked by an invisible acoustic target were used as a metric to analyze localization of moving sources of sound in naive cats. The target was presented in the lateral sound field and moved along an arc at constant angular speeds. Head-movement trajectories were characterized by a large-magnitude orienting component that undershot the target and a tracking component elicited by the target during acoustic pursuit. The tracking component was characterized by a succession of stepwise head movements that maintained a relatively close alignment of the median plane of the head with the moving acoustic target.

Ralph E. Beitel

1999-01-01T23:59:59.000Z

144

Dispersal of measured sound power levels for wind turbines  

Science Journals Connector (OSTI)

The standard IEC 61400?11 provides guidance in the measurement analysis and reporting of acoustic emissions(sound power levels) from wind turbine generator systems. The application of this standard aims to provide accurate results that can be replicated by others. We did several measurement operations according to this standard on various wind farms fitted with many turbine manufacturers on different ground types. Important differences have been noticed with equal working conditions between the most and the less noisy wind turbine on a single farm. We will present these results compared to the manufacturers' guaranteed values and initiate explanations (like the difficulties to link the wind speed at 10m above ground with the wind speed received at hub height; or the influence of wind incidence on blades).

René Gamba; Sébastien Garrigues

2008-01-01T23:59:59.000Z

145

Separation of acoustic waves in isentropic flow perturbations  

E-Print Network (OSTI)

The present contribution investigates the mechanisms of sound generation and propagation in the case of highly-unsteady flows. It is based on the linearisation of the isentropic Navier-Stokes equation around a new pathline-averaged base flow. As a consequence of this unsteady and non-radiating base flow, the perturbation equations satisfy a conservation law. It is demonstrated that this flow perturbations can be split into acoustic and vorticity modes, with the acoustic modes being independent of the vorticity modes. Moreover, we conclude that the present acoustic perturbation is propagated by the convective wave equation and fulfills Lighthills acoustic analogy. Therefore, we can define the deviations of the Navier-Stokes equation from the convective wave equation as true sound sources. In contrast to other authors, no assumptions on a slowly varying or irrotational flow are necessary. Using a symmetry argument for the conservation laws, an energy conservation result and a generalisation of the sound intensity is provided.

Christian Henke

2014-08-06T23:59:59.000Z

146

Sound propagation conditions in the equatorial South Pacific Ocean  

Science Journals Connector (OSTI)

A major part of the South Pacific Ocean is impacted by a cold water circulation induced by the Antarctic Circumpolar Current. This results in either a double or a very broad deep sound channel axis [R. N. Denham et al. J. Acoust. Soc. Am. 81 787–789 (1987)]. However nearer the equator this impact is reduced and a series of equatorial currents and counter currents come into play. An analysis is made of existing oceanographic data to determine the resulting sound?speed profile shape and sound channel axis depth. A comparison is made to profiles from the temperate regions of the South Pacific Ocean.

David G. Browning; Ronald N. Denham

1991-01-01T23:59:59.000Z

147

The Role of Sound Source Perception in Gestural Sound Description  

Science Journals Connector (OSTI)

We investigated gesture description of sound stimuli performed during a listening task. Our hypothesis is that the strategies in gestural responses depend on the level of identification of the sound source and specifically on the identification of the ... Keywords: Gesture, cross-modal relationships, embodied cognition, environmental sound perception, sound mimicry, sound source identification, sound tracing

B. Caramiaux, F. Bevilacqua, T. Bianco, N. Schnell, O. Houix, P. Susini

2014-04-01T23:59:59.000Z

148

Sound power level measurement of Sheng, a Chinese wind instrument  

Science Journals Connector (OSTI)

Sheng is one of the Chinese traditional wind instruments. But its sound power level has never been carefully measured. In this paper the sound powermeasurements of Sheng were performed for the first time in a reverberation chamber according to ISO standard and Chinese national standard. Two qualified musicians performed on their own instruments in the center of the reverberation chamber. The radiated sound energy and the dynamic ranges of the Sheng were investigated by four channel acoustic measuring equipments. Typical sound power values were obtained through averaging and the results were reported in this paper. It was showed that the mean forte sound power level can reach up to 98dB with a dynamic range of 22.5dB when music scale was performed. The method discussed here is valuable for the sound powermeasurements of other musical instruments. The measurement of the sound power radiated by national musical instruments lays foundations for the investigation into the acoustics of national music halls.

Yue Zhe Zhao; Shuo Xian Wu; Jian Zhen Qiu; Li Ling Wu; Hong Huang

2008-01-01T23:59:59.000Z

149

Observation of a second-sound-like mode in superfluid-filled aerogel  

Science Journals Connector (OSTI)

Superfluid He4 is interesting acoustically because it can support more than one mode of sound propagation, and these can be used to study critical properties. Recently, there has been interest in superfluid-filled aerogels, but for such compressible materials one does not observe the ordinary (fourth) sound; instead there is a mode intermediate between first and fourth sound and a second-sound-like mode. We present a theory for the modes and the first observation of the aerogel second-sound-like mode, which is important because it propagates near the critical temperature.

M. J. McKenna; Tania Slawecki; J. D. Maynard

1991-04-08T23:59:59.000Z

150

Pursuing the M.Eng. in acoustics through distance education from Penn State  

Science Journals Connector (OSTI)

Since 1987 the Graduate Program in Acoustics at Penn State has been providing remote access to graduate level education leading to the M.Eng. degree in Acoustics. Course lecture content is currently broadcast as a live-stream via Adobe Connect to distance students scattered throughout North America and around the world while archived recordings allow distance students to access lecture material at their convenience. Distance Education students earn the M.Eng. in Acoustics degree by completing 30 credits of coursework (six required core courses and four electives) and writing a capstone paper. Courses offered for distance education students include: fundamentals of acoustics and vibration electroacoustic transducers signal processing acoustics in fluid media sound and structure interaction digital signal processing aerodynamic noise acoustic measurements and data analysis ocean acoustics architectural acoustics noise control engineering nonlinear acoustics outdoor sound propagation computational acoustics flow induced noise spatial sound and 3D audio marine bioacoustics and acoustics of musical instruments. This poster will summarize the distance education experience leading to the M.Eng. degree in Acoustics from Penn State showcasing student demographics capstone paper topics enrollment statistics and trends and the success of our graduates.

2014-01-01T23:59:59.000Z

151

Metric approach for sound propagation in nematic liquid crystals  

E-Print Network (OSTI)

In the eikonal approach, we describe sound propagation near to topological defects of nematic liquid crystal as geodesics of a non-euclidian manifold endowed with an effective metric tensor. The relation between the acoustics of the medium and this geometrical description is given by Fermat's principle. We calculate the ray trajectories and propose a diffraction experiment to retrieve informations about the elastic constants.

E. Pereira; S. Fumeron; F. Moraes

2013-01-21T23:59:59.000Z

152

Size and scale effects as constraints in insect sound communication  

Science Journals Connector (OSTI)

...source due both to spreading and atmospheric absorption. At ranges greater...material, or in a shallow pool of water, the propagation of sound-waves...speci c acoustic resistance of water is about 3500 times that of...Orthoptera). 1. The tegminal generator. J. Exp. Biol. 52, 495...

1998-01-01T23:59:59.000Z

153

The contribution of 3-D sound to the human-computer interface  

E-Print Network (OSTI)

Sound inherently has a spatial quality, an ability to be localized in three dimensions. This is the essence of 3-D, or spatial, sound. A system capable of recording sounds as digitized samples and playing them back in a ...

Vershel, Mark Aaron

1981-01-01T23:59:59.000Z

154

Measurement of Acoustic Impedance  

Science Journals Connector (OSTI)

The acoustic impedance of a sample of material forming one boundary of a shallow cylindrical cavity can be determined by measuring the sound pressure produced when a known volume current is injected into the cavity from a high impedance source. The volume current is effectively determined by observing the pressure when the cavity is terminated rigidly. An impedance determination is thus reduced to measurement of the complex ratio of two observed voltages. By designing a ring source to suppress the first radial mode of the cavity the upper frequency limit set by uniformity of pressure distribution is extended by at least an octave. By avoiding leaks measurements can also be extended to very low frequencies. Secondary effects due to finite source impedance viscosity and heat losses at the walls have been evaluated. The method appears to be simple rapid and precise.

O. K. El?Mawardi

1948-01-01T23:59:59.000Z

155

Acoustic detection of neutrinos  

Science Journals Connector (OSTI)

When high energy neutrinosinteract with nucleons in the ocean a jet of hadrons is produced which deposits thermal energy. This thermal energy is expected to produce a sonic pulse which hopefully will be sufficiently intense and directional to enable the energy and direction of incidence of the primary neutrino to be determined [Antares Parvulescu J. Acoust. Soc. Am. 61 580(A) (1977)]. This paper discusses the physical mechanism whereby the energy of the neutrino is converted into a sound pulse. A simple model will be exploited to account for the signature expected from such an event. [Work supported in part by the U. S. Naval Ocean Research and Development Activity and by the U. S. Department of Energy.

Peter J. Westervelt

1978-01-01T23:59:59.000Z

156

Acoustics education in Ukraine  

Science Journals Connector (OSTI)

Acoustics education in Ukraine is considered. In more than 40 universities students learn acoustics: in the acoustics department of the National Technical University in Ukraine (only one department in Ukraine) and many related departments such as Nondestructive Testing Physics Electrical Engineering etc. Acoustical specializations of departments are presented. The most promising and developing acoustical specialization is biomedical acoustics.

Stanislav M. Mayevskyy; Leonid M. Gelman

1999-01-01T23:59:59.000Z

157

Classification of heart valve sounds from experiments in an anechoic water tank  

SciTech Connect

In vivo studies in both sheep and humans were plagued by a number of problems including movement artifacts, biological noise, low signal-to-noise ratio (SNR), chest-wall reverberation, and limited bandwidth recordings as discussed by [1]. To overcome these problems it was decided to record heart valve sounds under controlled conditions deep in an anechoic water tank, free from reverberation noise, including surface reflections. Experiments were conducted in a deep water tank at the Transdec facility in San Diego, which satisfies these requirements. The Transdec measurements are free of reverberations, but not totally free of acoustic and electrical noise. We used a high quality hydrophone together with a wide-band data acquisition system [2]. We recorded sounds from 100 repetitions of the opening-closing cycles on each of 50 different heart valves, including 21 SLS valves and 29 intact valves. The power spectrum of the opening and closing phases of each cycle were calculated and outlier spectra removed as described by Candy [2]. In this report, we discuss the results of our classification of the heart valve sound measurements. The goal of this classification task was to apply the fundamental classification algorithms developed for the clinical data in 1994 and 1996 to the measurements from the anechoic water tank. From the beginning of this project, LLNL's responsibility has been to process and classify the heart valve opening sounds. For this experiment, however, we processed both the opening sounds and closing sounds for comparison purposes. The results of this experiment show that the classifier did not perform well. We believe this is because of low signal-to-noise ratio and excessive variability in signal power from beat-to-beat for a given valve.

Axelrod, M C; Clark, G A; Scott, D

1999-06-01T23:59:59.000Z

158

Broadband low?frequency sound radiator with high?frequency pump resonator.  

Science Journals Connector (OSTI)

A new type of underwater low?frequency radiator is described. Operation of the radiator is based on the nonlinear conversion of high?frequency acoustic pump energy to low?frequency sound pulsation of the water volume of the open acoustic pump resonator. High?intensity pump waves in the resonator produce cavitation. Water containing bubbles is highly nonlinear (hundreds and even thousands of times more than pure water) and dispersive. Both of these factors and also the use of the pump resonator promote much stronger conversion of pump energy to low?frequency sound in comparison with a parametric radiator. The calculation of the acoustical characteristics is presented.

Dimitri M. Donskoy

1992-01-01T23:59:59.000Z

159

Localization of sound sources in rooms using an improved version of steered response power algorithm.  

Science Journals Connector (OSTI)

Localization of sound sources inside a room is a challenging problem. The possible applications involving speech?based source localization systems range from teleconferencing to home automation systems. For example the localization of a speaker inside a conference room can be very useful to place the speaker in a remote room by means of a spatial audio reproduction system. Also new applications will appear in home automation if accurate source localization systems are available in the future. One of the most robust approaches to source localization is the SRP?PHAT algorithm which has shown to provide very good localization results inside rooms with moderate reverberation. However the computational cost is highly dependent on the spatial sampling and the number of microphones making very difficult the localization of sound events if a coarse spatial sampling is used. In this paper we propose an improvement of this method where sound events are not missed even if a very coarse grid is used. The improvement is based on a previous calculation of the existent cross?correlation lags between spatially adjacent points in the grid assuring that the non?sampled space is covered in terms of cross?correlation lags between microphone pairs when running the algorithm. Several experiments conducted in different rooms with complex acoustics confirm the validity and benefits of the proposed method.?

Jose J. Lopez; Maximo Cobos; Amparo Marti

2010-01-01T23:59:59.000Z

160

Impacts of Anthropogenic Sound  

E-Print Network (OSTI)

and P. J. Fish (1998). Broadband spectra of seismic surveyfrom a seismic watergun. J Acoust Soc Am 111(6): Fish, J. F.

Hildebrand, John A

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Multipurpose characterization of glazing systems with silica aerogel: In-field experimental analysis of thermal-energy, lighting and acoustic performance  

Science Journals Connector (OSTI)

Abstract Thermal-energy, acoustic and lighting performance of innovative glazing systems with aerogel inclusion is evaluated through in-field experiments. The study is carried out by monitoring two dedicated prototype buildings located in central Italy, and the consistency of results with in-lab analyses is investigated. Analyses showed that aerogel can decrease energy consumption for heating by up to 50% in winter, and its capability to keep the thermal zone warmer even several days after that the heating system is switched off. Acoustic analyses confirmed in-lab measurements, showing aerogel capability to increase the façade acoustic insulation index by 3 dB. Lighting analyses showed aerogel effect to lower the daily average illuminance level by about 10% during sunny days. In cloudy weather conditions, with low level of solar radiation and indoor illuminance, the effect was relatively higher. In those cases when windows include shading elements such as protruding roof or deep window pad, aerogel effect was not clearly identified through continuous monitoring. The results of this integrated in-field experimental campaign showed that aerogel filled glazing cameras represent effective and innovative solutions for energy saving in winter, useful for improving acoustic façade performance with limited penalties in terms of daylighting.

Franco Cotana; Anna Laura Pisello; Elisa Moretti; Cinzia Buratti

2014-01-01T23:59:59.000Z

162

Sound | Open Energy Information  

Open Energy Info (EERE)

Sound Sound Jump to: navigation, search Improved engineering and appropriate use of setbacks near residents has largely eliminated the problem wind farms had with noise in the 1980s and 1990s. Aerodynamic noise has been reduced by advancing blade design and orienting blades upwind of the turbine tower. A small amount of noise is generated by the mechanical components of the turbine. Modern wind turbines are designed with noise reduction in mind. Sound power levels at the source of a wind turbine are in the range of 90-105 dB(A). Proper setback requirements reduce wind farm sound pressure to background-noise levels. For example, at a distance of 350 meters, the sound pressure level for a wind farm is typically less than 45 dB(A). Rural background sound pressure is typically around 30-45dB(A). Higher wind

163

Sound Oil Company  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Sound Oil Company Sound Oil Company file:///C|/Documents%20and%20Settings/blackard/Desktop/EIA/LEE0152.HTM[11/29/2012 2:30:44 PM] DECISION AND ORDER OF THE DEPARTMENT OF ENERGY Application for Exception Name of Petitioner: Sound Oil Company Date of Filing: August 16, 1994 Case Number: LEE-0152 On August 16, 1994, Sound Oil Company (Sound) of Seattle Washington, filed an Application for Exception with the Office of Hearings and Appeals of the Department of Energy. In its Application, Sound requests that it be relieved of the requirement that it file the Energy Information Administration's (EIA) form entitled "Resellers'/Retailers' Monthly Petroleum Product Sales Report" (Form EIA-782B). As explained below, we have determined that the Application for Exception should be denied.

164

Sound production by white shrimp (Penaeus setiferus) analysis of another crustacean-like sound from the Gulf of Mexico, and the possible use of passive sonar for dedication and stock assessment of shrimp  

E-Print Network (OSTI)

Sound production by white shrimp (Penaeus setiferus) was studied acoustically and behaviorally. Another crustacean-like signal from the Gulf of Mexico was analyzed, and the use of passive sonar for the detection and stock assessment of shrimp...

Berk, Ilona M.

2012-06-07T23:59:59.000Z

165

Successfully merging architectural and electronic acoustical treatments  

Science Journals Connector (OSTI)

In enclosed volumes the integration of electronic acoustical components with architectural surface treatments forms a hybrid system that produces the perceived acoustical conditions. Since the underlying operating principles for electro-acoustic enhancement systems differs considerably between manufacturers the requirements for system infrastructure are not germane nor is the optimum integration of architectural treatments. As a result the nature of the work performed by the acoustical consultant changes to accommodate optimum performance of the specific “hybrid” system which may also include other forms of variable treatments.

Steve Barbar

2011-01-01T23:59:59.000Z

166

Utility Sounding Board  

NLE Websites -- All DOE Office Websites (Extended Search)

Reports, Publications, and Research Utility Toolkit Sponsored E-Source Membership Utility Potential Calculator EE Maximization Tool Conduit Utility Sounding Board Residential...

167

Test of Sabine’s reverberation time in ergodic auditoriums within geometrical acoustics  

Science Journals Connector (OSTI)

In room acoustics Sabine’s formula for the reverberation time as a function of its volume and effective surface absorption is valid in the limit of a perfectly ‘‘diffuse’’ sound. In the spirit of the general discussion of Joyce [J. Acoust. Soc. Am. 5 8 643 (1975)] in the geometrical acoustic limit and as a paradigm of the complex three?dimensional problem here a simple two?dimensional (2?D) room with the shape of a stadium with smooth boundaries is considered. In this system it is known that almost all trajectories are chaotic in the strongest sense of the term namely ergodic mixing and K?complex. Numerical results are reported on the decay law of an impulse sound and on its characteristic reverberation time as a function of room volume (in 2D the stadium surface) and effective surface absorption (in 2D effective perimeter absorption). In the limit of very small absorptions Sabine’s law is verified with good accuracy. However these results show that larger but still small absorptions lead to a departure from a pure exponential decay. This stems from the existence of finite time correlations that are important at short times.

Olivier Legrand; Didier Sornette

1990-01-01T23:59:59.000Z

168

Evaluation of hydro sound and vibration measurements during the use of the Hydro-Sound-Damper (HSD) at the wind farm “London Array”  

Science Journals Connector (OSTI)

Since some years a noise prevention concept for the protection of marine animals exists in Germany. Based on that the acoustic underwater noise from the pile driving at offshore wind farms is required to be less than 160 dB (SEL) at a distance of 750 m. This value however is often exceeded so that the use of a soundproofing system is necessary. The Hydro-Sound-Damper (HSD) is a new versatile method to reduce the noise during offshore pile driving. To achieve this elements of different sizes and materials are used which are fixed to fishing nets. The principle of operation and the effectiveness of these HSD elements were investigated in the laboratory and in situ under offshore conditions at the world’s largest offshore wind farm “London Array.” During the offshore tests thorough measurements were performed which metered the propagation of the hydro sound and the vibrations of the sea floor at various distances and directions. The evaluation of these data led to very promising results concerning underwater noise reduction. This article describes the theory and implementation of the HSD at “London Array” and focuses on the interpretation of the data from the hydro sound and vibration measurements.

Benedikt Bruns

2013-01-01T23:59:59.000Z

169

Acoustical environments measured in urban and suburban schools  

Science Journals Connector (OSTI)

Measurements of sound levels in numerous classrooms and other instructional spaces in primary educational facilities over the past several years have revealed a lack of acoustical control within public schools. We have found environments in excess of NC?60 more often than we have found NC?30 rooms in unoccupied spaces. Occupied sound levels in instructional spaces may exceed 90 dB(A). Because of poor acoustical design we have found classrooms on the same floor with background sound levels that vary from NC?60 to NC?25 depending on the distance from the HVAC mechanical room. This paper will present some case studies that demonstrate the need for an acoustical standard for the classroom.

2001-01-01T23:59:59.000Z

170

Sound Speed Perturbations Due to Internal Tides  

Science Journals Connector (OSTI)

Internal tides are perhaps the most prevalent and largest amplitude internal gravity waves in the ocean. They are commonly generated by the scattering of surfacetidal energy into internal modes when the surfacetides propagate on to continental shelves. A portion of the internal tidal energy propagates into the deep ocean. One of the effects of internal tides on underwater acoustic propagation is to perturb the temperature and salinity versus depth profiles and thus the sound speed versus depth profile. Starting with temperature and salinity versus depth profiles from near Eleuthera Island the internal tide eigenfunctions as well as the sound speed profile have been computed for a water depth of 4500 m. Assuming a value for the vertical displacement amplitude of a first vertical mode internal tide the perturbed temperature and salinity profiles have been computed. From these perturbed profiles the consequent perturbed sound speed profiles have been computed for cases of maximum up and down internal tide displacement. The first mode internal tide has no vertical displacement at the sea surface and bottom and a maximum near the base of the main thermocline (depth of about 1200 m). Since the SOFAR axis is also near the base of the main thermocline and since the pressureeffects on sound speed are predominant below the SOFAR axis the sound speed perturbation due to the first mode internal tide is greatest at a depth (about 550 m) above the SOFAR axis. An internal tide with a maximum vertical displacement of 10 m produces a maximum sound speed perturbation of ±0.7 m/sec.

Christopher N. K. Mooers

1973-01-01T23:59:59.000Z

171

Acoustical standards and criteria documentation of sustainability in hospital design and construction  

E-Print Network (OSTI)

Acoustical standards and criteria documentation of sustainability in hospital design, commentary is offered about design alternatives that aided or inhibited rating success. Standards. "Sound and Vibration Control," ASHRAE Handbook of HVAC Applications, 2007 American Society of Heating

Paris-Sud XI, Université de

172

Acoustic tomography of currents in the ocean by the linearized method of matched nonreciprocity  

Science Journals Connector (OSTI)

The matched nonreciprocity method recently developed for acoustic diagnostics of ocean currents is based on matching the nonreciprocity of a sound field propagating along the current and against it. In this paper...

V. V. Goncharov

2001-01-01T23:59:59.000Z

173

Acoustics in the Klebanoff-Saric Wind Tunnel: Background Identification, Forcing, and Active Control  

E-Print Network (OSTI)

that dominate the pressure spectrum. Directional separation of waves in the test section revealed that motor and blade passing noise travels primarily upstream into the test section. Finally, the acoustic treatments in the plenum are effective at removing sound...

Kuester, Matthew

2012-07-16T23:59:59.000Z

174

Acoustic articulatory evidence for quantal vowel categories : the features [low] and [back  

E-Print Network (OSTI)

In recent years, research in human speech communication suggested that the inventory of sound units that are observed in vowels across languages is strongly influenced by the acoustic properties of the human subglottal ...

Jung, Youngsook, Ph. D. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

175

Sound radiation measurement with nearfield holography  

Science Journals Connector (OSTI)

With holography an entire 3D wave field can be reconstructed from data obtained on a single 2D surface. Such high information content has made holography a powerful research tool and useful extensions from its original optical domain to other wave fields such as sound have naturally been pursued. However it has usually been assumed that the resolution of a holographicreconstruction is limited by the wavelength of the radiation; this limitation severely diminishes the usefulness of holography for sound fields when the wavelengths are many times larger than the objects to be imaged. We have developed a new technique called nearfield holography which eliminates the wavelength resolution limit and in addition permits a determination of: (1) the complete sound pressure and particle velocity fields produced by the source; (2) the mode of vibration of the surfaces of the source; (3) the vector intensity field (showing flow of acoustic energy) around the source; (4) the farfield directivity pattern; (5) the total power radiated into a half?space. A particularly interesting application of nearfield holography occurs in the study of sound radiation from musical instruments. [Work supported by ONR.

J. D. Maynard; E. G. Williams

1982-01-01T23:59:59.000Z

176

Relationships between objective acoustic indices and acoustic comfort evaluation in nonacoustic spaces  

Science Journals Connector (OSTI)

Much attention has been paid to acoustic spaces such as concert halls and recording studios whereas research on nonacoustic buildings/spaces has been rather limited especially from the viewpoint of acoustic comfort. In this research a series of case studies has been carried out on this topic considering various spaces including shopping mall atrium spaces library reading rooms football stadia swimming spaces churches dining spaces as well as urban open public spaces. The studies focus on the relationships between objective acoustic indices such as sound pressure level and reverberation time and perceptions of acoustic comfort. The results show that the acoustic atmosphere is an important consideration in such spaces and the evaluation of acoustic comfort may vary considerably even if the objective acoustic indices are the same. It is suggested that current guidelines and technical regulations are insufficient in terms of acoustic design of these spaces and the relationships established from the case studies between objective and subjective aspects would be useful for developing further design guidelines. [Work supported partly by the British Academy.

Jian Kang

2004-01-01T23:59:59.000Z

177

Ocean acoustic noise budgets: Application to the environmental assessment of offshore wind power generation.  

Science Journals Connector (OSTI)

A noise budget is a listing of the various sources of acoustic noise and their associated ranking by importance. A number of different types of budgets can be conceived using various acoustic measures such as intensity energy or duration of maximum amplitude level. These budgets are typically parameterized by frequency and are usually computed over 1/3 octave bands. As part of the environmental assessment of the proposed offshore wind powergeneration project under the Rhode Island Special Area Management Plan (SAMP) noise measurements were made using the Passive Acoustic Listener (PAL) systems off the coast of Rhode Island prior to the installation of any wind power facilities. Two PALs were deployed within two miles of Block Island in water depths of 20 m from October 6 to November 11 2008. The data included noise spectra and source identification every 3 min. Short snapshots of unusual sounds were also recorded. From this data the ocean acoustic noise budget is computed with contributions from shipping wind/waves marine mammals and rain from 500 Hz to 50 kHz. The shipnoise data is correlated with ship traffic data from the Automatic Identification System (AIS). [Funding provided by the Rhode Island Office of Energy Resources.

2009-01-01T23:59:59.000Z

178

E-Print Network 3.0 - acoustic location system Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

and inhomogeneous, imposing several major challenges to communication systems: very limited Source: Ragsdell, Kenneth M. - Design Engineering Center, University of...

179

Acoustical and Noise Control Criteria and Guidelines for Building Design and Operations  

E-Print Network (OSTI)

Noise, vibration and acoustical design, construction, commissioning and operation practices influence building cost, efficiency, performance and effectiveness. Parameters for structural vibration, building systems noise, acoustics and environmental...

Evans, J. B.; Himmel, C. N.

180

E-Print Network 3.0 - acoustic tiltedti media Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Follow geometry and physical properties of a desired acoustic system Efficient Source: Smith III, Julius Orion - Center for Computer Research in Music and Acoustics, Stanford...

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

E-Print Network 3.0 - acoustic transfer functions Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Computer Technologies and Information Sciences 3 The Acoustic Oceanographic Buoy A Light Acoustic Data Acquisition System Summary: : The AOB functionality allows for the...

182

Measurement of the speed of sound by observation of the Mach cones in a complex plasma under microgravity conditions  

E-Print Network (OSTI)

We report the first observation of the Mach cones excited by a larger microparticle (projectile) moving through a cloud of smaller microparticles (dust) in a complex plasma with neon as a buffer gas under microgravity conditions. A collective motion of the dust particles occurs as propagation of the contact discontinuity. The corresponding speed of sound was measured by a special method of the Mach cone visualization. The measurement results are fully incompatible with the theory of ion acoustic waves. We explore the analogy between a strongly coupled Coulomb system and a solid. A scaling law for the complex plasma makes it possible to derive a theoretical estimate for the speed of sound, which is in a reasonable agreement with the experiments in strongly coupled complex plasmas.

Zhukhovitskii, D I; Molotkov, V I; Lipaev, A M; Naumkin, V N; Thomas, H M; Ivlev, A V; Schwabe, M; Morfill, G E

2014-01-01T23:59:59.000Z

183

Acoustic agglomeration of power-plant fly ash. A comprehensive semi-annual progress report  

SciTech Connect

Results obtained during the reporting period are presented. The agglomeration of submicron fly ash particles has been studied as a function of sound pressure level, sound frequency, loading, and exposure time. A second generation model of the agglomeration process is being developed. A high-frequency, high-intensity variable speed siren delivering at least 600 W at frequencies up to 4000 Hz has been developed and tested. Details on the design and operation are presented. The agglomeration chamber has been completely cleaned and the aerosol generating system has been rebuilt. A mathematical model of the acoustics of agglomeration is being developed. Preliminary results of computerized electron microscopic scanning of fly ash particles during agglomeration are presented. (DMC)

Reethof, G.

1980-02-01T23:59:59.000Z

184

Photo of the Week: Acoustic Levitation for Medicine | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Acoustic Levitation for Medicine Acoustic Levitation for Medicine Photo of the Week: Acoustic Levitation for Medicine October 19, 2012 - 2:08pm Addthis This acoustic levitator was originally developed to help NASA simulate microgravity conditions, but now, scientists are using this piece of equipment to study pharmaceutical solutions at the molecular level. At Argonne National Laboratory, droplets are suspended in air between two sets of speakers, which generate sound waves at frequencies slightly above the audible range -- about 22 kilohertz. Learn more about how acoustic levitation is performed and how it helps scientists study pharmaceuticals here. | Photo by Dan Harris, Argonne National Laboratory.

185

Velocity of Sound Measurements in High?Pressure, High?Temperature Steam  

Science Journals Connector (OSTI)

Experimental information concerning the acoustic velocity in steam as a function of pressure and temperature is quite limited. Yet it is of particular interest to steam turbine designers who are now planning units as large as 400 000 kw operating at 4500 lb/sq in. and 1200°F so as to increase thermal efficiencies of such units. Apparatus is now in operation for measuring the acoustic velocity up to 2000 lb/sq in. and 750°F using a variable path acoustic interferometer.Measurements are taken at 200?lb/sq in. intervals along a given isotherm using a sound frequency of 750 kc. A special experimental high?pressure boiler is used to generate the steam at the desired pressure and the stem is then increased in temperature by means of a stainless steel superheater before entering the interferometer. The interferometer also of stainless steel is enclosed by an insulated steel vessel maintained at a given constant temperature by another separate steam system. Future work is now being considered up to 6000?lb/sq in. steam pressure based upon results of present experiments.

James Woodburn

1960-01-01T23:59:59.000Z

186

Assessment of ecosystem biodiversity by acoustic diversity indices  

Science Journals Connector (OSTI)

Assessment of ecosystem biodiversity by measurement of acoustic diversity was explored [B. L. Krause Explorers J. Winter 156–160 (1993)]. Specific acoustic indices (e.g. based on frequency spectrum) were developed and correlated with standard diversity indices (e.g. standard species abundance indices). Necessary technological infrastructures and analytic processes to measure acoustic dynamics of ecological biodiversity were explored. An automated web?based infrastructure capable of capturing processing and relaying real?time field measurements from multiple ecosystems to desktop and home computers was developed tested and implemented. Key infrastructure components were remote field instrumentation remote computer processing wireless digital relay instrumentation Internet server and automation relational database and website software. A dynamic digital library of ecological acoustic samples correlated ecosystem attributes and acoustic analysis methodologies was established. Library resources including digital sound files captured from ecosystems were made available to researchers and the public over the Internet [N. Metzger and M. Blumenthal Realizing Info. Future NAP 113–119 (1994)]. Indices of acoustic ecosystem diversity were refined through application on existing digital ecosystem sound recordings and digital sounds captured from multiple ecosystems. The performance of these indices was compared to standard biodiversity indices applied to the same ecosystems.

2001-01-01T23:59:59.000Z

187

Acoustic measurement of potato cannon velocity  

E-Print Network (OSTI)

This article describes measurement of potato cannon velocity with a digitized microphone signal. A microphone is attached to the potato cannon muzzle and a potato is fired at an aluminum target about 10 m away. The potato's flight time can be determined from the acoustic waveform by subtracting the time in the barrel and time for sound to return from the target. The potato velocity is simply the flight distance divided by the flight time.

Courtney, M; Courtney, Amy; Courtney, Michael

2006-01-01T23:59:59.000Z

188

Acoustical considerations in design and construction of Turkish Contractors Association headquarters  

Science Journals Connector (OSTI)

A LEED candidate building of Turkish Contractors Association Headquarters is a prestige building located in Ankara the project and construction of which is sponsored by leading contractor companies of Turkey. As it represents the status of Turkish construction industry from concept phase to the very recent inauguration of the building the major consideration has been the application of latest technology and concepts such as sustainability within the scheme of building that can pioneer future works in the field. Chilled beam ventilation is one example of new technologies applied in the building system design that takes into account high energy efficiency with minimum use of fuel or natural sources. In acoustical terms the building envelope and structural members together with interior and environmental noise sources in relation to the building services are studied. In order to provide acoustical comfort levels in acoustically sensitive spaces and to control noise and vibration at the source and sound paths materials and methods are developed. Specifically acoustical interventions and solutions proposed for multi-purpose hall offices board and meeting rooms foyers mechanical rooms roof-top units and generators located close by at the site are discussed within the context of this paper.

2014-01-01T23:59:59.000Z

189

MTS 0-933957-28-9 1 A MATLAB GUI for Ocean Acoustic Propagation  

E-Print Network (OSTI)

MTS 0-933957-28-9 1 A MATLAB GUI for Ocean Acoustic Propagation Chris Eggen, Bruce Howe, and Brian­A MATLAB-based MAP Graphical User Interface (GUI) is described for accessing bathymetry and sound speed databases and using them to predict ocean acoustic transmission and to display the results. MATLAB scripts

Dushaw, Brian

190

Theory of Acoustical Wave Propagation in Porous Media  

Science Journals Connector (OSTI)

A theory is developed for the propagation of sound waves in a rigid isotropic and homogeneous porous medium filled with a compressible fluid including both the effect of viscous dissipation and the effect of thermal comduction. With a capillaric model assumed an expression for the permeability as a function of the frequency is also given. For very low frequencies (isothermal case) and very high frequencies (adiabatic case) the results reduce to those of a theory presented by Morse [J. Acoust. Soc. Amer. 24 696 (1952)]. The present theory can be used to determine the structural parameters of a porous system at a given frequency. Attenuation and phase factors are plotted as functions of a nondimensional frequency parameter for various combinations of the characteristic constants.

P. G. Smith; R. A. Greenkorn

1971-01-01T23:59:59.000Z

191

Spatiotemporal processing and time-reversal for underwater acoustic communications  

E-Print Network (OSTI)

High-rate underwater acoustic communication can be achieved using transmitter/receiver arrays. Underwater acoustic channels can be characterized as rapidly time-varying systems that suffer severe Inter Symbol Interferences ...

Wang, Daniel Y

2005-01-01T23:59:59.000Z

192

Acoustic transducer  

DOE Patents (OSTI)

An acoustic transducer is described comprising a one-piece hollow mandrel into the outer surface of which is formed a recess with sides perpendicular to the central axis of the mandrel and separated by a first distance and with a bottom parallel to the central axis and within which recess are a plurality of washer-shaped discs of a piezoelectric material and at least one disc of a temperature-compensating material with the discs being captured between the sides of the recess in a pre-stressed interference fit, typically at 2,000 psi of compressive stress. The transducer also includes a power supply and means to connect to a measurement device. The transducer is intended to be used for telemetry between a measurement device located downhole in an oil or gas well and the surface. The transducer is of an construction that is stronger with fewer joints that could leak fluids into the recess holding the piezoelectric elements than is found in previous acoustic transducers. 4 figs.

Drumheller, D.S.

1997-12-30T23:59:59.000Z

193

Acoustic transducer  

DOE Patents (OSTI)

An acoustic transducer comprising a one-piece hollow mandrel into the outer surface of which is formed a recess with sides perpendicular to the central axis of the mandrel and separated by a first distance and with a bottom parallel to the central axis and within which recess are a plurality of washer-shaped discs of a piezoelectric material and at least one disc of a temperature-compensating material with the discs being captured between the sides of the recess in a pre-stressed interference fit, typically at 2000 psi of compressive stress. The transducer also includes a power supply and means to connect to a measurement device. The transducer is intended to be used for telemetry between a measurement device located downhole in an oil or gas well and the surface. The transducer is of an construction that is stronger with fewer joints that could leak fluids into the recess holding the piezoelectric elements than is found in previous acoustic transducers.

Drumheller, Douglas S. (Cedar Crest, NM)

1997-01-01T23:59:59.000Z

194

Refinement, testing, and application of an Integrated Data Assimilation/Sounding System (IDASS) for the DOE/ARM Experimental Program. Final report for period September 20, 1990 - May 8, 1997  

SciTech Connect

This report describes work done by NCAR under the ''Refinement, Testing, and Application of an Integrated Data Assimilation/Sounding System (IDASS) for the DOE/ARM Experimental Program''. It includes a discussion of the goals, findings and a list of 27 journal articles, 92 non-refereed papers and 30 other presentations not associated with a formal publication.

Parsons, David B.

2002-04-09T23:59:59.000Z

195

Developing criteria for identifying acoustical defects  

Science Journals Connector (OSTI)

In a construction defect lawsuit of a multifamily residential project the determination of whether a defect exists often hinges on the criteria applied. For many acoustical items such as plumbing and HVAC noise there are no code requirements but a number of guidelines and recommendations. For items such as noise from traffic or airborne and impact sound isolation between units minimum code requirements exist but often a more stringent standard is applied. How does an expert decide when it is appropriate to apply an acoustical standard that is beyond that required by building codes? Project drawings marketing materials homeowner regulations and other documents can provide indications of the intent and promise of the project as it relates to acoustical issues. The process is discussed with examples from recent cases.

John LoVerde; David W. Dong

2013-01-01T23:59:59.000Z

196

Vortex sound and the flute  

Science Journals Connector (OSTI)

The flute is investigated for its aeroacoustical properties based on the vortexsound theory. Particle imagevelocimetry(PIV) is used for quantitative flow determination of the jet?edge interaction. The Endoscopic?PIV offers a nonobstructive view of the system over all phases. The evaluation of the source term through the vorticity is done according to M. Howe (1975). The acoustic flow across the embouchure is determined by excitation through the foot. The flute is operated near 1200 Hz with various jet speeds. Finally the acoustic radiation power in the far field is determined to be compared with the source terms. The following findings are presented: (i) The space integrated and time averaged power of the coherent source terms turns out to be positive i.e. emitting acoustic energy. (ii) There is a dominant contribution near the labium. (iii) The source term power compares favorably with the far field power which is well below 1% of the total input power. The results demonstrate that the vorticity of the upper and lower shear layers of the jet cancels to a great extent except for regions where the transverse amplitude of the jet is large.

2006-01-01T23:59:59.000Z

197

Nonlinear dynamics of a self-excited thermoacoustic system subjected to acoustic forcing  

E-Print Network (OSTI)

are performed at ambient temperature and atmospheric pressure. increasing A (Fig. 4a) and decreasing A (Fig. 4c). When unforced (A ¼ 0), the system has a self- excited mode at a natural frequency of fs ¼ 195 Hz (vertical dashed lines). When forced at a low... Premixed Flame, PhD thesis, University of Cambridge, Department of Engineer- ing, United Kingdom, 2013. [13] S. Chen, IEEE T. Plasma Sci. 18 (1990) 570–576. [14] B. vander Pol, J. vander Mark, Nature 120 (1927) 363–364. [15] J. Walsh, G. Johnston, R...

Balusamy, Saravanan; Li, Larry K.B.; Han, Zhiyi; Juniper, Matthew P.; Hochgreb, Simone

2014-06-25T23:59:59.000Z

198

Acoustic design of a new elementary school to meet high performance prerequisites using a school districts base design: Predictions and results from commissioning  

Science Journals Connector (OSTI)

An architectural firm was selected to design a new elementary school using the school district’s standard building but with modifications to meet the prerequisites of the Collaborative for Performance Schools (CHPS). Two acoustic prerequisites are a part of the CHPS programs including a background limit of 45 dB(A) and a reverberation time of 0.6 seconds. A 2-story design forms the basis of design. First tests were done at an existing elementary school with the same design. Acoustical recommendations for wall designs room finishes and HVAC design were incorporated into the design and construction of the new school. The school was not near significant transportation noise sources. After construction was mostly complete tests were done to learn the sound transmission loss of walls and floor/ceiling systems. Reverberation time tests and background sound levels were measured after construction was complete. Background sound met design goals in all but one space except for the sound generated by a wind turbine mounted on one end of the buildings. This was added by the schools Principal during the latter part of construction without consulting everyone. This proved to be a significant source that had to be removed.

Steve Pettyjohn

2012-01-01T23:59:59.000Z

199

Future directions in impulsive sound sources  

Science Journals Connector (OSTI)

While impulsive acoustic sources have long been used by the geophysical community for underwater exploration sonar applications have been relatively uncommon. Recent work in the area of electric discharge devices has led to both a better understanding of the physics of this class of impulsive soundgenerator and to new devices which may in turn lead to an expanded role for such technology in sonar applications—in particular the observation that the electric arc commonly associated with sparker sound sources represents a wasteful and unnecessary complication. Proper electrode design and control of the electric discharge can eliminate the arc leaving only a steam bubble and can thereby enhance the low?frequency performance of such a device. Insight into the performance and potential of such devices is in part a result of improved computer modeling capabilities of the nonlinear processes associated with impulsive devices as well as on the use of high?speed data acquisition in interpreting experimental results. This is especially true for determining the effects of interactions in arrays of bubble sources. Beyond the electric discharge sources understanding of the coupling of energy from the bubble to the sound field suggests improvements for chemically driven sound sources as well. An update of work on these impulsive devices and the modeling efforts that support them is presented. The performance of some recently developed devices and the potential for future development will be discussed.

Edward F. Rynne

1993-01-01T23:59:59.000Z

200

Acoustic cryocooler  

DOE Patents (OSTI)

An acoustic cryocooler with no moving parts is formed from a thermoacoustic driver (TAD) driving a pulse tube refrigerator (PTR) through a standing wave tube. Thermoacoustic elements in the TAD are spaced apart a distance effective to accommodate the increased thermal penetration length arising from the relatively low TAD operating frequency in the range of 15-60 Hz. At these low operating frequencies, a long tube is required to support the standing wave. The tube may be coiled to reduce the overall length of the cryocooler. One or two PTR's are located on the standing wave tube adjacent antinodes in the standing wave to be driven by the standing wave pressure oscillations. It is predicted that a heat input of 1000 W at 1000 K will maintian a cooling load of 5 W at 80 K.

Swift, Gregory W. (Santa Fe, NM); Martin, Richard A. (Los Alamos, NM); Radenbaugh, Ray (Louisville, CO)

1990-01-01T23:59:59.000Z

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While these samples are representative of the content of NLEBeta,
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201

Acoustic horn reflectance: Equations and measurements  

Science Journals Connector (OSTI)

Reflectance is the transfer function between forward and reflected components of pressure waves that propagate in wave guides such as acoustic horns. Exact solutions to Webster's Horn Equation are only known for a few specific shapes including parabolic conical and exponential. Explicit equations for reflectance in these three horn shapes were recently published for infinite-length horns. Measured reflectance in 3D-printed finite-length examples of these horn shapes show no similarity in the frequency-domain to exact reflectance for infinite-length horns. The similarity improves after adjustments to both the equations and the measurements. New equations were derived for exact reflectance of finite-length horns. Measured reflectance was smoothed by time-domain windowing. In contrast to frequency-domain reflectance comparisons of time-domain reflectance prior to the time sound reaches the end of the horn were not much affected by these adjustments. Because exact equations are known and 3D-printed examples are easy to obtain these three horn shapes may be useful as standards for comparing different reflectance-measurement systems.

2014-01-01T23:59:59.000Z

202

Case study of a prototype elementary school designed to meet the ansi classroom acoustics standard  

Science Journals Connector (OSTI)

The school board standards group that prepares design criteria for a large district an architectural firm specializing in educational environments a contractor and an acoustical consultant formed a team to develop a series of bid alternates for a prototype elementary school to upgrade the acoustical performance of the school to meet the ANSI classroom acoustics standard. Three primary areas of work included room finishes to reduce reverberation times to 0.60 s or less; selecting wall assemblies and details to reach the STC 50 required in the standard to reduce sound transmission between rooms; and HVAC system design to reduce noise produced by the air?conditioning system to the 35 dBA required in the standard. Only minor adjustments had to be made to the finish materials and wall assemblies in the prototype school design to meet the requirements of the standard. Major changes in design concept and implementation had to be made to the HVAC system design to meet the 35 dBA requirement. The paper describes the prototype design the design processes used to develop the modifications and the cost impacts of the proposed changes.

2004-01-01T23:59:59.000Z

203

Exposure to seismic survey alters blue whale acoustic communication  

Science Journals Connector (OSTI)

...research-article Animal behaviour 1001 14 Exposure to seismic survey alters blue whale acoustic communication...their natural functions. Sounds from seismic surveys are intense and have peak frequency...changed their vocal behaviour during a seismic survey that deployed a low-medium power...

2010-01-01T23:59:59.000Z

204

Acoustical Design of the First Presbyterian Church Stamford, Connecticut  

Science Journals Connector (OSTI)

This church designed by Harrison and Abramovitz Architects is unusual in that the basic architectural shape provides the desired acoustical environment requiring no “applied” sound?absorbing material. Hearing conditions are highly satisfactory for both speech and music. The reverberation time characteristic is discussed along with the “gain” provided by the pulpit canopy. A tape recording will be presented and slides will be shown.

David Klepper

1959-01-01T23:59:59.000Z

205

ACOUSTIC FORMING FOR ENHANCED DEWATERING AND FORMATION  

SciTech Connect

The next generation of forming elements based on acoustic excitation to increase drainage and enhances formation both with on-line control and profiling capabilities has been investigated in this project. The system can be designed and optimized based on the fundamental experimental and computational analysis and investigation of acoustic waves in a fiber suspension flow and interaction with the forming wire.

Cyrus K Aidun

2007-11-30T23:59:59.000Z

206

Multiresolution Reproducing Kernel Particle Methods in Acoustics  

E-Print Network (OSTI)

, and reliability of dynamic analysis. This is of great importance because the noise prediction of a complexMultiresolution Reproducing Kernel Particle Methods in Acoustics R. A. Uras Reactor Engineering In the analysis of complex phenomena of acoustic systems, the computational model­ ing requires special attention

Liu, Wing Kam

207

Analytic Model for Acoustic Propagation in the Deep Sound Channel  

E-Print Network (OSTI)

is undamped, there is a conserved "energy" E(x) = 1 2 dz dx 2 + log v(z) = constant (4) along every ray, furthers such under- standing. Derivation of the Analytic Model We first derive Snell's law in the standard anharmonic oscillator with potential log v(z). Any profile v(z) with a minimum thus implies the existence

Press, William H.

208

Sound emission from the gas of molecular superrotors  

E-Print Network (OSTI)

We use an optical centrifuge to deposit a controllable amount of rotational energy into dense molecular ensembles. Subsequent rotation-translation energy transfer, mediated by thermal collisions, results in the localized heating of the gas and generates strong sound wave, clearly audible to the unaided ear. For the first time, the amplitude of the sound signal is analyzed as a function of the experimentally measured rotational energy. The proportionality between the two experimental observables confirms that rotational excitation is the main source of the detected sound wave. As virtually all molecules, including the main constituents of the atmosphere, are amenable to laser spinning by the centrifuge, we anticipate this work to stimulate further development in the area of photo-acoustic control and spectroscopy.

Milner, A A; Milner, V

2015-01-01T23:59:59.000Z

209

Acoustic demonstrations for education in speech science  

Science Journals Connector (OSTI)

Acoustic demonstrations are highly effective for education in speech science. We recently developed two educational tools for acoustics. The first educational tool is a set of physical models of the human vocal tract and related models. It contains cylinder and plate?type models [T. Arai J. Phonetic Soc. Jpn. 5(2) 31–38 (2001)] a sliding three?tube model [T. Arai Acoust. Sci. Technol. to be published] lungmodels an artificial larynx and head?shaped models [T. Arai Acoust. Sci. Technol. 27(2) 111–113 (2006)]. Each model has its own advantages and if combined effectively can produce a systematic and comprehensive education in speech production from the lungs to the head. The second educational tool is ‘‘Digital Pattern Playback (DPP)’’ [T. Arai et al. Acoust. Sci. Tech. to be published] which converts a spectrographic image of a speech signal back to sound by digital signal processing. A printed spectrogram on a sheet of paper can also be converted immediately after capturing the image from a camera and we confirmed that this is more intuitive for learners than converting from an electronic image. [Work partially supported by JSPS.KAKENHI (17500603).

2006-01-01T23:59:59.000Z

210

History of American acoustics—Introductory comments  

Science Journals Connector (OSTI)

The history of acoustics has been illuminated by the efforts in recent years of R. Bruce Lindsay and so this Bicentennial Session is being held in his honor. In addition certain numerological factors spurred our efforts in this Bicentennial Year 1976. It was just one hundred years ago that A. G. Bell's invention—the first practical telephone—was exhibited at the 1876 Centennial Exposition in Philadelphia. A year later in 1877 the first edition of Rayleigh's Theory of Sound appeared. The conjunction of these two events eventually had a powerful influence on the development of acoustics. The invited speakers will in the papers which follow endeavor to describe all of the significant advances made by Americans to technical acoustics. Apparently it all began with Joseph Henry's efforts to solve a problem in auditorium acoustics. At the brink of World War II acoustics was invaded by a host of scientists and engineers. During the period 1941–45 and in the post war years frontiers were breached in almost every direction at such a rate that description of the advances made cannot be done here. And so most of our speakers will bring their histories up only to about the year 1940.

Richard K. Cook

1976-01-01T23:59:59.000Z

211

Identification and Active Control of Multiple Sources of Sound Work at the Institute of Sound and Vibration Research (ISVR) has led to a sophisticated  

E-Print Network (OSTI)

in acoustics known as multiple- input multiple-output (MIMO) problems. The research findings have attracted, aviation and defence. Engineers at the University of Southampton began work to tackle problems in acoustics Systems, and Philip Nelson, Professor of Acoustics, were appointed as lecturers in ISVR. Since that time

Sóbester, András

212

Nonperturbative ocean acoustic tomography inversion of 1000?km pulse propagation in the Pacific Ocean  

Science Journals Connector (OSTI)

A nonperturbative inversion was performed of acoustic tomographymeasurements made in the northeastern Pacific Ocean in July 1989 in which acoustic transmissions from a 250?Hz broadband source located near the sound?channel axis were recorded at a long vertical array of hydrophones 1000 km away. In contrast with a conventional inversion this nonperturbative inversion does not assume that travel times are linearly related to the sound?speed deviations from a background sound?speed model. The inversion process involved three steps: (1) Measured pulse travel times and the source and receiver locations were used to determine the range average of the equivalent symmetric sound?slowness profile. That part of the inversion used only curve fitting and Abel transforms and required independent (nontomographic) information only to help identify the pulse arrivals. (2) Under the assumption that the range dependence of sound speed was small we used the reciprocal of the range?averaged sound?slowness profile to approximate the range average of the sound?speed profile. (3) Constraining the sound speed below the sound?channel axis to match climatological data and neglecting the range dependence of sound speed below the sound?channel axis allowed us to estimate the range average of the sound?speed profile above the sound?channel axis. This inversion was compared with the range average of sound speed calculated from CTD measurements made during the experiment over a 10?day period. The agreement was good between 50? and 300?m depths but there were some disagreements near the surface and near the sound?channel axis.

R. Michael Jones; Bruce M. Howe; James A. Mercer; Robert C. Spindel; T. M. Georges

1994-01-01T23:59:59.000Z

213

Instrumentation for Studies of Sound in the Atmosphere  

Science Journals Connector (OSTI)

Explosive charges are fired on the earth's surface at points in Arizona California and San Clemente Island. The resulting sound waves centering at 2 cps are detected by an array of sensing units in Southwestern Arizona. This array extends 108 miles along an east?west segment of a great circle with units placed at 4?mile intervals. From these units transmission lines are routed along the ground to recording stations near Dateland and Gila Bend. A single twin?conductor field line serves from one to three units and may be as long as 40 miles. Over such a line the sensing units are turned on by relays and the signals are transmitted to the recording station. The use of carriers has permitted the separation of multiplexed signals by means of tuning controls. Push?pull condenser?coupled amplifiers drive the Brush recording pens. Sensitivity is controlled in 6?db steps through a range from 5 to 160 dynes per sq cm peak?to?peak for full scale deflection. A pass band from 0.2 to 5 cps is set by an acoustic filter in the sensing unit. Several years of use and development have resulted in a system which has proved to be quite satisfactory.

George O. Pickens

1953-01-01T23:59:59.000Z

214

Acoustic Based Sketch Recognition  

E-Print Network (OSTI)

investigate this new area, which we call acoustic based sketch recognition, and evaluate the possibilities of using it as a new interaction technique. We focus specifically on building a recognition engine for acoustic sketch recognition. We first propose a...

Li, Wenzhe

2012-10-19T23:59:59.000Z

215

Acoustic radiation due to surface wave breaking.  

Science Journals Connector (OSTI)

While wave breaking is continually occurring at the sea surface its transient and sporadic nature makes it difficult to measure. Experimental results are presented that show how acoustic methods can be used as a remote sensor of this fundamental process. Sea surface?generated acoustic radiation (40 to 4000 Hz) is directly related to a quantitative measure of the boundary dynamics; i.e. the Toba variable. The frequency spectrum of the radiation remains remarkably unchanged over a wide range of environmental conditions but the correlation between the sound pressure level and the Toba variable undergoes an abrupt change when spilling breakers start to occur. Results support the use of acoustics to remotely measure the rate of energy being dissipated by wave breaking and the wavelength of the dominant gravity wave component. Theoretical studies have related the field measurements to analytical and laboratory results cited in the literature indicating that remote monitoring of the rate of occurrence and size distribution of ‘‘infant’’ (freshly entrained) bubbles may be possible if splashes on the surface do not radiate significant sound. Signal processing algorithms for the remote measurements discussed above are enhanced by eigenstructure analysis of the measured cross?spectral density matrix. [Work sponsored by ONR and NUSC.

Robert M. Kennedy; Stewart A. L. Glegg

1992-01-01T23:59:59.000Z

216

Auralization of urban soundscaping designs using the Arup SoundLab  

Science Journals Connector (OSTI)

Noise is unwanted sound (from an urban planning point of view). The standard practice to controlnoise while valuable is a negative process (i.e. reducing unwanted “noise”). In response there is a drive by several authorities to take a more positive approach to improve and manage soundscapes in cities and civic spaces. Urban soundscape design consists of planning shaping and managing the sound to fit each area of the masterplan in terms of civic cultural and social character. Arup uses its SoundLab a 3D sound facility (ambisonic) to design and auralise (the sound equivalent to visualisation) soundscapes with planners architects or artists and demonstrate to Local Planning Authorities or clients the results of the design. An example of urban soundscaping design is Dark Neville Street Leeds for Leeds City Council where architectural lighting design acoustical soundscaping design were integrated together with an artistic sonic piece by Hans?Peter Kuhn which was auralised in the Arup SoundLab. An example of “indoor” sonic art and soundscape design installation is “Harmonic Bridge” by Bill Fontana and Arup Acoustics in the Turbine Hall of the Tate Modern (June?August 2006) where the sonic art piece was composed in the SoundLab.

Seb Jouan

2008-01-01T23:59:59.000Z

217

Design parameters for acoustical treatments in a subway station renovation  

Science Journals Connector (OSTI)

Acoustical treatments have been incorporated into the design of renovations in the Essex Street MBTA Station in Boston. Criteria were developed relating to noise reduction from train noise on the platform and sound isolation between northbound and southbound sides of the station. This paper discusses the limitations on acoustical treatments imposed by the functional and structural restraints of the station including the availability of surfaces to be treated safety access requirements maintenance and durability restrictions and architectural goals relating to aesthetics lighting and textures. The presentation focuses on the manner in which the acoustical consultant and architect responded to each other's goals and the way that conflicts were resolved. Measurements were made of existing acoustical parameters. The renovations are presently under construction.

Carl J. Rosenberg; Neville A. Powers; Allen M. Lieb

1976-01-01T23:59:59.000Z

218

Sound Waves in the Atmosphere at Infrasonic Frequencies  

Science Journals Connector (OSTI)

Various geophysical processes generate sound waves in the atmosphere. Some typical sources are auroral discharges in the upper atmosphere tornadoes and severe storms surface waves on the oceans volcanic explosions earthquakes and atmospheric oscillations arising from unstable wind flow at the tropopause. Man?made sources include powerful explosions and the shock waves from vehicles moving at supersonic speeds at altitudes below about 125 km. The components of sound?wave energy at infrasonic frequencies (oscillation periods >1.0 sec) are propagated for large distances (thousands of kilometers) over the earth's surface with very little loss of energy from absorption by viscosity and heat conduction. But the propagation depends strongly on (a) the horizontally stratified temperature structure of the atmosphere (b) the influence of gravity at oscillation periods greater than the atmospheric resonance period ?300 sec and (c) the nonuniform distribution of atmospheric winds. The microphones and electroacoustical apparatus at an infrasonics observation station e.g. the one at Washington D. C. measure (1) the amplitude and waveform of incident sound pressure (2) the direction of local propagation of the wave (3) the horizontal trace velocity and (4) the distribution of sound wave energy at various oscillation frequencies. Researches on propagation require observational data from a network of stations separated geographically by large distances coupled with theoretical analysis of sound propagation to arrive at useful results on the acoustics of the atmosphere.

Richard K. Cook

1972-01-01T23:59:59.000Z

219

DETECTION OF IMPULSE-LIKE AIRBORNE SOUND FOR DAMAGE IDENTIFICATION IN ROTOR BLADES OF WIND TURBINES  

E-Print Network (OSTI)

DETECTION OF IMPULSE-LIKE AIRBORNE SOUND FOR DAMAGE IDENTIFICATION IN ROTOR BLADES OF WIND TURBINES burdens of wind turbines. To detect damage of rotor blades, several research projects focus on an acoustic, rotor blade, wind turbine INTRODUCTION There are several publications of non destructive damage

Boyer, Edmond

220

Lattice Boltzmann BGK simulation of non-linear sound waves: The development of a shock front  

E-Print Network (OSTI)

Lattice Boltzmann BGK simulation of non-linear sound waves: The development of a shock front J. M Boltzmann model to simulating non-linear propagative acoustic waves is considered. The lattice Boltzmann propagation at highReynolds numberis considered. These results suggest that the lattice Boltzmann model

Boyer, Edmond

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Application of the Transmission Line Matrix method for outdoor sound propagation modelling Part 2  

E-Print Network (OSTI)

Application of the Transmission Line Matrix method for outdoor sound propagation modelling ­ Part 2 propagation model. The time-domain acoustic model is based on the Transmission Line Matrix method. Its.apacoust.2013.07.015 #12;Part 1, the presentation and evaluation of the Transmission Line Matrix method showed

Paris-Sud XI, Université de

222

Experimenting with Sound Immersion in an Arts and Crafts Museum  

E-Print Network (OSTI)

wireless devices. Our system takes into consideration the position of museum visitors as well, in real-time by the visitor's device. Keywords: museum, immersion, edutainment, sound spatialization, head]. However, just like images, sounds are fundamental for learning [5]. The listening process is by nature

Boyer, Edmond

223

Processing of prosthetic heart valve sounds for single leg separation classification  

SciTech Connect

Efforts are concentrated on the sounds corresponding to the heart valve opening cycle. Valve opening and closing acoustics present additional information about the outlet strut condition---the structural component implicated in valve failure. The importance of the opening sound for single leg separation detection/classification is based on the fact that as the valve opens, the disk passively hits the outlet strut. The opening sounds thus yield direct information about outlet strut condition with minimal amount of disturbance caused by the energy radiated from the disk. Hence the opening sound is a very desirable acoustic signal to extract. Unfortunately, the opening sounds have much lower signal levels relative to the closing sounds and therefore noise plays a more significant role than during the closing event. Because of this it is necessary to screen the sounds for outliers in order to insure a high sensitivity of classification. Because of the sharp resonances appearing in the corresponding spectrum, a parametric processing approach is developed based on an autoregressive model which was selected to characterize the sounds emitted by the Bjork--Shiley convexo--concave (BSCC) valve during opening cycle. First the basic signals and the extraction process used to create an ensemble of heart valve sounds are briefly discussed. Next, a {ital beat} {ital monitor} capable of rejecting beats that fail to meet an acceptance criteria based on their spectral content is developed. Various approaches that have been utilized to enhance the screened data and produce a reliable {ital heart} {ital valve} {ital spectrogram} which displays the individual sounds (power) as a function of beat number and temporal frequency are discussed. Once estimated, the spectrogram and associated parameters are used to develop features supplied to the various classification schemes. Finally, future work aimed at even further signal enhancement and improved classifier performance is discussed.

Candy, J.V.; Jones, H.E. [University of California, Lawrence Livermore National Laboratory, P.O. Box 808, L-495, Livermore, California 94550 (United States)

1995-06-01T23:59:59.000Z

224

Air handler sound power prediction method based on ARI Standard 260  

Science Journals Connector (OSTI)

A method of predicting air handler sound power based on ratings for a product line is described. The method provides octave band sound power levels based on ratings obtained using Air?Conditioning and Refrigeration Institute (ARI) Standard 260 Sound Rating Of Ducted Air Moving And Conditioning Equipment. Detailed sound power information for HVAC equipment is not always available but it is important in accurately predicting noise levels in acoustically sensitive spaces. To address this need a rating program was undertaken using ARI 260. This standard is a reverberant room technique for sound rating ducted air conditioning equipment using a reference sound source substitution method. Since sound travels from the source to receiver along numerous paths this standard differentiates between sound power emanating from several common paths called components. Components for this project included ducted discharge free inlet plus casing ducted inlet and casing. The standard provides guidance on adequate number of fan sizes appurtenances and operating characteristics. The intent of the project was to provide a model to predict sound power by unit size component operating condition and unit configuration. Good agreement was found between predicted levels and measured data.

2000-01-01T23:59:59.000Z

225

Inter-individual difference of one type of pulsed sounds produced by beluga whales (Delphinapterus leucas)  

Science Journals Connector (OSTI)

Belugas often exchange one type of broadband pulsed sounds (termed PS1 calls) which possibly functions as a contact calls (Morisaka et al. 2013). Here we investigate how belugas embed their signature information into the PS1 calls. PS1 calls were recorded from each of five belugas including both sexes and various ages at the Port of Nagoya Public Aquarium using a broadband recording system when in isolation. Temporal and spectral acoustic parameters of PS1 calls were measured and compared among individuals. Kruskal-Wallis test revealed that inter-pulse intervals (IPIs) the number of pulses and pulse rates of PS1 calls had significant differences among individuals but duration did not (?2?=?76.7 p<0.0001; ?2?=?26.2 p<0.0001; ?2?=?45.3 p<0.0001; and ?2?=?4.7 p?=?0.316 respectively). The contours depicted by the IPIs as a function of pulse order were also individually different and only the contours of a calf fluctuated over time. Four belugas except a juvenile had individually distinctive power spectra. These results suggest that several acoustic parameters of PS1 calls may hold individual information. We found PS1-like calls from the other captive belugas (Yokohama Hakkeijima Sea Paradise) suggested that the PS1 call is not the specific call for one captive population but the basic call type for belugas.

2014-01-01T23:59:59.000Z

226

Argonne Acoustic Levitation Video Goes Viral  

NLE Websites -- All DOE Office Websites (Extended Search)

"Inside the Advanced Photon Source" Inside the latest Argonne Now "Inside the Advanced Photon Source" Inside the latest Argonne Now APS Director Stephenson Named Argonne Distinguished Fellow Advanced Photon Source, Canadian Light Source Strengthen Ties, Expand X-ray Technology and Research Rose of APS and CNM One of Four DOE Early Career Award Winners Scientists Close-In on Artificial Spider Silk APS News Archives: 2012 | 2011 | 2010 | 2009 2008 | 2007 | 2006 | 2005 2004 | 2003 | 2002 | 2001 2000 Subscribe to APS News rss feed Argonne Acoustic Levitation Video Goes Viral SEPTEMBER 25, 2012 Bookmark and Share Drops of solution being suspended for a long period of time, thanks to the vibrational force of sound waves that keep them stationary in an air column. More than 41,000 Google hits for "acoustic levitation Argonne" as of

227

Broadband acoustic imaging of breaking waves  

Science Journals Connector (OSTI)

An acoustic array was deployed in the near?surface layer in Saanich Inlet BC to image breaking waves using only the naturally occurring acoustical radiation in the band (160 and 2000 Hz) from the breaking region. The 15?element array was configured as a horizontal cross with an 8?m aperture bottom?moored and positioned nominally 3 m beneath the surface. A novel broadband scheme combined information at six independent frequencies above about 400 Hz to yield unambiguous resolved images. A parametric image analysis shows that the images align closely with the wind and can be observed moving downwind with a speed roughly equal to the dominant phase speed of the wind waves. Absolute power levels are found to be consistent with previously published results. The data also provide inferences regarding the sound generation mechanism at ‘‘collective oscillation’’ frequencies below about 400 Hz. [Work supported by ONR.

Rex K. Andrew; David M. Farmer; R. Lynn Kirlin

1997-01-01T23:59:59.000Z

228

An overview of time?reversal acoustics  

Science Journals Connector (OSTI)

Time?reversal invariance is a very powerful concept in physics. In the field of acoustics where time reversal invariance occurs time?reversal experiments may be achieved simply with arrays of transmit?receive transducers allowing an incident wave field to be sampled recorded time?reversed and re?emitted. Time reversal mirrors (TRMs) may be used to study random media and chaotic reverberating structures. Common to these complex media is a remarkable robustness exemplified by observations that the more complex the medium between the probe source and the TRM the sharper the focus. TRMs open the way to new signal processings that interest imaging detection telecommunications and therapy. Time reversal mirrors have plenty of applications including ultrasonic therapy and medical imaging non destructive testing telecommunications underwater acoustics seismology sound control home automation. An overview of these fields will be presented.

Mathias Fink

2008-01-01T23:59:59.000Z

229

Method and apparatus for ultrasonic doppler velocimetry using speed of sound and reflection mode pulsed wideband doppler  

DOE Patents (OSTI)

According to the present invention, a method and apparatus rely upon tomographic measurement of the speed of sound and fluid velocity in a pipe. The invention provides a more accurate profile of velocity within flow fields where the speed of sound varies within the cross-section of the pipe. This profile is obtained by reconstruction of the velocity profile from the local speed of sound measurement simultaneously with the flow velocity. The method of the present invention is real-time tomographic ultrasonic Doppler velocimetry utilizing a to plurality of ultrasonic transmission and reflection measurements along two orthogonal sets of parallel acoustic lines-of-sight. The fluid velocity profile and the acoustic velocity profile are determined by iteration between determining a fluid velocity profile and measuring local acoustic velocity until convergence is reached.

Shekarriz, Alireza (Kennewick, WA); Sheen, David M. (Richland, WA)

2000-01-01T23:59:59.000Z

230

Experimental study on sound absorbing performance of rubber crumb  

Science Journals Connector (OSTI)

The present paper describes an experimental campaign aimed at the determination of acoustical properties of vulcanized rubber crumbs obtained by the shredding of used tires. In particular their performance as sound absorbing material in lined ducts was investigated. The most innovative aspect that is addressed in the study is the use of a waste material such as rubber tires reduced into small grains as a sound absorbing material: tires are in fact usually used at the end of their life cycle as fuel and burned in cement kilns in order to take advantage of their high heating value with all the problems of pollution that this solution produces. Two kinds of rubber crumbs have been investigated in terms of characteristic dimension of the grains porosity and sound absorbing coefficient while their "in situ" performance when used inside lined and parallel-baffle rectangular ducts has been evaluated measuring their insertion loss. The results of this research show that the acoustical behaviour of the tested rubber crumbs is the typical behaviour of the granular materials showing a noteworthy performance of the tested material in the low frequency range opening a scenery of possible applications where noise has relevant tonal components below 315 Hz.

Davide Borelli; Corrado Schenone; Ilaria Pittaluga

2013-01-01T23:59:59.000Z

231

Experimental study on sound absorbing performance of rubber crumb  

Science Journals Connector (OSTI)

The present paper describes an experimental campaign aimed at the determination of acoustical properties of vulcanized rubber crumbs obtained by the shredding of used tires. In particular their performance as sound absorbing material in lined ducts has been investigated. The most innovative aspect that is addressed in the study is the use of a waste material such as rubber tires reduced into small grains as a sound absorbing material: tires are in fact usually used at the end of their life cycle as fuel and burned in cement kilns in order to take advantage of their high heating value with all the problems of pollution that this solution produces. Two kinds of rubber crumbs have been investigated in terms of characteristic dimension of the grains porosity and sound absorbing coefficient while their “in situ” performance when used inside lined and parallel-baffle rectangular ducts has been evaluated measuring their insertion loss. The results of this research show that the acoustical behavior of the tested rubber crumbs is the typical behavior of the granular materials showing a noteworthy performance of the tested material in the low frequency range opening a scenery of possible applications where noise has relevant tonal components below 315 Hz.

2013-01-01T23:59:59.000Z

232

Good classroom acoustics are a good investment for America  

Science Journals Connector (OSTI)

Buzz Towne’s idealism sparked ASA’s current activities to improve classroom acoustics including ANSI S12 WG43’s activity to produce an American standard for classroom acoustics. But idealism alone may not suffice to realize the reforms Buzz sought. It will help if advocates can show that good classroom acoustics are a good investment for community and nation. Absent were the resources necessary for serious economic cost?benefit studies some very informal ‘‘back?of?the?envelope’’ engineering estimates were made by acousticians audiologists and material vendors. All assume 20 year life cycles for new and renovated classrooms. In one scenario costs for quiet HVAC and sound absorbing ceilings are shown to be a small fraction of costs for ordinary school construction yielding substandard acoustics. In another scenario costs for quiet classroom HVAC are shown to be small compared to annual operating costs per student. A third scenario shows that a modest but plausible assumed increase in average lifetime earnings generously will repay the initial costs for good acoustics. These scenarios do not consider the economic costs of bad acoustics including high dropout rates truancy juvenile crime and teacher burnout. The authors hope to inspire others to more fully study the economic social and educational benefits of good acoustics.

David Lubman; Louis C. Sutherland

1999-01-01T23:59:59.000Z

233

Surface acoustic wave dust deposition monitor  

DOE Patents (OSTI)

A system is disclosed for using the attenuation of surface acoustic waves to monitor real time dust deposition rates on surfaces. The system includes a signal generator, a tone-burst generator/amplifier connected to a transmitting transducer for converting electrical signals into acoustic waves. These waves are transmitted through a path defining means adjacent to a layer of dust and then, in turn, transmitted to a receiving transducer for changing the attenuated acoustic wave to electrical signals. The signals representing the attenuated acoustic waves may be amplified and used in a means for analyzing the output signals to produce an output indicative of the dust deposition rates and/or values of dust in the layer. 8 figs.

Fasching, G.E.; Smith, N.S. Jr.

1988-02-12T23:59:59.000Z

234

Acoustic studies for alpha background rejection in dark matter bubble chamber detectors  

SciTech Connect

COUPP (Chicagoland Observatory for Underground Particle Physics) is an experiment with bubble chambers able to detect dark matter directly either with Spin-Dependent or with Spin-Independent interactions. The target material is a superheated liquid (usually CF3I) that can be bubble nucleated due to nuclear recoils produced by elastic collisions of dark matter particles. The bubble growth inside the chamber is accompanied with an acoustic signature. The acoustic technique has been successfully used to have a good alpha discrimination (about 99%). In this paper, we present different studies and results related with the characterization of the acoustic properties of the detector and the different phenomena involved in the acoustic measurements of the bubble growth, such as sound generation, sound transmission and optimization of piezoelectric transducers.

Bou-Cabo, M.; Felis, I.; Ardid, M.; Collaboration: COUPP Collaboration

2013-08-08T23:59:59.000Z

235

Magneto?Acoustic Interaction in Mercury  

Science Journals Connector (OSTI)

The magnetically induced acoustic absorption coefficient in liquidmercury has been measured around its inverse relaxation frequency using an on?line computer and magnetic fields of up to 10 kg. The hybrid computer?operated differential measuring system took between 2560 and 25 600 experiments per run. The results agree with Anderson's predictions [J. Acoust. Soc. Amer. 25 529 (1953)]. [Work supported in part by the National Science Foundation.

Thomas D. Sachs; Gregory P. Hughes

1969-01-01T23:59:59.000Z

236

Processing of prosthetic heart valve sounds for classification. Revision 1  

SciTech Connect

People with serious heart conditions have had their expected life span extended considerably with the development of the prosthetic heart valve especially with the great strides made in valve design. Even though the designs are extremely reliable, the valves are mechanical and operating continuously over a long period, therefore, structural failures can occur due to fatigue. Measuring heart sounds non-invasively in a noisy environment puts more demands on the signal processing to extract the desired signals from the noise. In this paper the authors discuss acoustical signal processing techniques developed to process noisy heart valve sounds measured by a sensitive, surface contact microphone and used for the eventual classification of the valve.

Candy, J.V.; Jones, H.E.

1994-04-01T23:59:59.000Z

237

Spatial coherence measurement of sound in the northwest Pacific Ocean  

Science Journals Connector (OSTI)

An experiment on the transverse horizontal spatial coherence of sound propagating in the ocean was performed jointly by Chinese and Russian acousticians in the northwest Pacific Ocean in June 1990. Three hydrophones with spacings of 270 and 130 m were put in the water at a 30?m depth. The acoustic source with four cw (from 109 to 860 Hz) and a broadband pseudorandom noise signal was drifted at a depth of 100 m. Part of the measurement results of up to 140 km are presented in this paper. It seems that the spatial coherence was related to the amplitude of the received signals and rises considerably in convergence zones.

Dinghua Guan; Ruichao Zhu; Renhe Zhang; Yaoming Chen

1993-01-01T23:59:59.000Z

238

EIS-0160: Puget Sound Area Electric Reliability Plan  

Energy.gov (U.S. Department of Energy (DOE))

The U.S. Department of Energy’s Bonneville Power Administration prepared this statement to assess the environmental and socioeconomic implications of potential solutions to address a power system problem in the Puget Sound area of Washington State.

239

Sight and Sound - Scenario  

NLE Websites -- All DOE Office Websites (Extended Search)

Scenario Scenario Summary Student Pages Internet Links Index Introduction Development/Rationale for the Year-End Project Teacher Preparation for the Year-End Project The Sight and Sound Project - an Anecdotal Account Introduction to and Selection of Year-End Projects Conducting the Literature Search Project Proposal Conducting the Experiments Wrapping up with the Reports and Presentations Introduction: Mr. Tom Henderson is part of a talented science staff at Glenbrook South High School. Glenbrook South High School (GBS) is set in an educationally supportive and affluent community. The physics staff work in teams teaching physics to over 80 percent of the student population and are constantly looking for ways to use technology to empower students with the ability to apply learned concepts of physics to their lives. With this goal in mind,

240

Zero lattice sound  

SciTech Connect

We study the N{sub f}-flavor Gross-Neveu model in 2+1 dimensions with a baryon chemical potential {mu}, using both analytical and numerical methods. In particular, we study the self-consistent Boltzmann equation in the Fermi liquid framework using the quasiparticle interaction calculated to O(1/N{sub f}), and find solutions for zero sound propagation for almost all {mu}>{mu}{sub c}, the critical chemical potential for chiral symmetry restoration. Next we present results of a numerical lattice simulation, examining temporal correlation functions of mesons defined using a point-split interpolating operator, and finding evidence for phononlike behavior characterized by a linear dispersion relation in the long wavelength limit. We argue that our results provide the first evidence for a collective excitation in a lattice simulation.

Hands, Simon [Department of Physics, University of Wales Swansea, Singleton Park, Swansea SA2 8PP (United Kingdom); Strouthos, Costas G. [Department of Physics, Duke University, Durham, North Carolina 27708 (United States); Division of Science and Engineering, Frederick Institute of Technology, Nicosia 1303 (Cyprus)

2004-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
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241

The science of underwater sound: Education, communication, and outreach  

Science Journals Connector (OSTI)

As a complex scientific topic underwater sound can be challenging for scientists to discuss and effectively communicate with non-science audiences. Educational audiences span formal K-16 classrooms to museum and aquarium visitors. The science of sound is often included in upper middle school physical sciences curricula high school physics classes and undergraduate and graduate university courses which can take advantage of calculus to support student understanding. Communicating with the media presents other challenges: pressing or immediate deadlines; a need to deliver eye-catching flashy pieces that capture reader attention; and a general lack of fundamental knowledge of underwater sound by readers. Scientists must be proactive in their engagement with media to ensure good fundamental science is communicated and to increase useful stories about new developments in underwater sound research. Regulators and other decision-makers are also pressed for time when contemplating a topic yet they need the most up-to-date scientific findings to support their decision-making. This talk will provide an overview of the challenges that ocean acoustic specialists face when trying to communicate the results of their research and meet the needs of diverse audiences. In addition strategies and possible solutions will be discussed.

2014-01-01T23:59:59.000Z

242

On the evolution of controllers for sound spatialization  

Science Journals Connector (OSTI)

Dynamic changes in spatialsound attributes have played a role in classical Western music for a long time. It is known that choreographic movements of operasingers were sometimes made for acoustic considerations. Probably the first mechanical spatialsound controller is the so?called wind swell that is found in pipe organs. Already in 1712 Renatus Harris mentions how swelling enables the player to project the sound of the pipes ad libitum to nearby or further distances. With the invention of electroacoustic music a number of electromechanical devices were developed to control spatial aspects of sound (primarily positioning sound sources in 3?D space). Typical examples are Stockhausen’s rotational table (developed in the 1950s) and Manfred Krause’s sound mill (1960). In this presentation the evolutionary steps in the design of spatialsound controllers will be outlined—beginning with early purely mechanical devices up to recent approaches including the author’s participation in the development of a gestural controllable soundsystem based on virtual microphone control (ViMiC).

2006-01-01T23:59:59.000Z

243

Acoustic emission before avalanches in granular media  

Science Journals Connector (OSTI)

Avalanches of granular media are mainly characterized by the observation and the measurement of the main angles of avalanche corresponding first to the movement of isolated beads and to the whole movement of a great part of the grains. These characterisations do not give any information about the rearrangements of the grains inside the layer of granular beads. As any movement of a grain produces a deformation of the structure it is quite normal to expect for a sound that will propagate inside the granular medium. We present an experimental study of the precursors of avalanches on spherical granular glass beads and silica aerogels in powder (size of grains less than 80 micrometers). Acoustic emission has been recorded with two piezoelectric transducers placed on the lower part of the material layer. Our results show clearly that before any movement on the upper part of the beads layer so for an angle less than the first angle of avalanche movements inside the material produce pulsed sounds that can be recorded. Theses vibrating events are occurring more and more when the angle is increasing until the first angle of avalanche where acoustic emission becomes intense.

Vincent Gibiat; Eric Plazza; Pierre De Guibert

2008-01-01T23:59:59.000Z

244

Sight and Sound - Student Page  

NLE Websites -- All DOE Office Websites (Extended Search)

Information Sheet Information Sheet Project: Your project involves a study of the physics involved in the production of sound and the detection of light and sound by animal species. Technical information about the ability of animals to produce sound and their ability to perceive the world through sight and hearing will be collected by means of background readings. The behavior of light and sound waves will be experimentally analyzed using computer-interfaced light and sound probes (or a computer-interfaced motion detector for ultrasound studies) and the results will be extended to the sensory ability of various animal species. By the end of this project, you should be able to: discuss with both words and diagrams the nature (description, category, physical means of creation and propagation, etc.) and

245

Propagation of ion-acoustic solitons in an electron beam-superthermal plasma system with finite ion-temperature: Linear and fully nonlinear investigation  

SciTech Connect

The propagation of ion-acoustic (IA) solitons is studied in a plasma system, comprised of warm ions and superthermal (Kappa distributed) electrons in the presence of an electron-beam by using a hydrodynamic model. In the linear analysis, it is seen that increasing the superthermality lowers the phase speed of the IA waves. On the other hand, in a fully nonlinear investigation, the Mach number range and characteristics of IA solitons are analyzed, parametrically and numerically. It is found that the accessible region for the existence of IA solitons reduces with increasing the superthermality. However, IA solitons with both negative and positive polarities can coexist in the system. Additionally, solitary waves with both subsonic and supersonic speeds are predicted in the plasma, depending on the value of ion-temperature and the superthermality of electrons in the system. It is examined that there are upper critical values for beam parameters (i.e., density and velocity) after which, IA solitary waves could not propagate in the plasma. Furthermore, a typical interaction between IA waves and the electron-beam in the plasma is confirmed.

Saberian, E. [Department of Physics, Faculty of Sciences, Azarbaijan Shahid Madani University, 53714-161 Tabriz (Iran, Islamic Republic of); Department of Physics, Faculty of Basic Sciences, University of Neyshabur, Neyshabur (Iran, Islamic Republic of); Esfandyari-Kalejahi, A.; Rastkar-Ebrahimzadeh, A.; Afsari-Ghazi, M. [Department of Physics, Faculty of Sciences, Azarbaijan Shahid Madani University, 53714-161 Tabriz (Iran, Islamic Republic of)

2013-03-15T23:59:59.000Z

246

Acoustic Heating Peter Ulmschneider  

E-Print Network (OSTI)

Acoustic Heating Peter Ulmschneider lnstitut fiir Theoretische Astrophysik der Universitat waves are a viable and prevalent heating mechanism both in early- and in late-type stars. Acoustic heating appears to be a dominant mechanism for situations where magnetic fields are weak or absent

Ulmschneider, Peter

247

Classification of heart valve single leg separations from acoustic clinical measurements  

SciTech Connect

Our system classifies the condition (intact or single leg separated) of in vivo Bjork-Shiley Convexo-Concave (BSCC) heart valves by processing acoustic measurements of clinical heart valve opening sounds. We use spectral features as inputs to a two-stage classifier, which first classifies individual heart beats, then classifies valves. Performance is measured by probability of detection and probability of false alarm, and by confidence intervals on the probability of correct classification. The novelty of the work lies in the application of advanced techniques to real heart valve data, and extensions of published algorithms that enhance their applicability. We show that even when given a very small number of training samples, the classifier can achieve a probability of correct classification of 100%.

Clark, G.A.; Bowman, B.C.; Boruta, N.; Thomas, G.H.; Jones, H.E.; Buhl, M.R.

1994-05-01T23:59:59.000Z

248

Puget Sound area electric reliability plan. Draft environmental impact statement  

SciTech Connect

The Puget Sound Area Electric Reliability Plan Draft Environmental Impact Statement (DEIS) identifies the alternatives for solving a power system problem in the Puget Sound area. This Plan is undertaken by Bonneville Power Administration (BPA), Puget Sound Power & Light, Seattle City Light, Snohomish Public Utility District No. 1 (PUD), and Tacoma Public Utilities. The Plan consists of potential actions in Puget Sound and other areas in the State of Washington. A specific need exists in the Puget Sound area for balance between east-west transmission capacity and the increasing demand to import power generated east of the Cascades. At certain times of the year, there is more demand for power than the electric system can supply in the Puget Sound area. This high demand, called peak demand, occurs during the winter months when unusually cold weather increases electricity use for heating. The existing power system can supply enough power if no emergencies occur. However, during emergencies, the system will not operate properly. As demand grows, the system becomes more strained. To meet demand, the rate of growth of demand must be reduced or the ability to serve the demand must be increased, or both. The plan to balance Puget Sound`s power demand and supply has these purposes: The plan should define a set of actions that would accommodate ten years of load growth (1994--2003). Federal and State environmental quality requirements should be met. The plan should be consistent with the plans of the Northwest Power Planning Council. The plan should serve as a consensus guideline for coordinated utility action. The plan should be flexible to accommodate uncertainties and differing utility needs. The plan should balance environmental impacts and economic costs. The plan should provide electric system reliability consistent with customer expectations. 29 figs., 24 tabs.

Not Available

1991-09-01T23:59:59.000Z

249

Microsoft PowerPoint - Subsea_Acoustics v5.ppt  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Acoustic Impacts on Marine Mammals Acoustic Impacts on Marine Mammals from Subsea Oil & Gas Processing DOE Strategy to Address Noise from Subsea Petroleum Processing Technologies DOE Strategy to Address Noise from Subsea Petroleum Processing Technologies Noise Types & Thresholds High Level, Intermittent Low Level, Continuous MMS Workshop Nov. 17-19, 2009 Boston, MA Marine Mammals and Noise Marine Mammal Commission March 2007 Advisory Committee on Acoustic Impacts on Marine Mammals Marine Mammal Commission February 2006 Effects of Subsea Processing on Deepwater Environments in the Gulf of Mexico Minerals Management Service May 2008 Addressing the Effects of Human- Generated Sound on Marine Life Joint Subcommittee on Ocean Science & Technology (JSOST) January 2009 Facilities Utilizing Subsea Petroleum Processing Technologies

250

The acoustics of the outdoor Shakespeare theater—Rutland, UK  

Science Journals Connector (OSTI)

The outdoor Shakespeare Amphitheatre at Tolethorpe (Rutland UK) is an unusual form of theater in that the actors perform in the open air while the audience is enclosed in a lightweight Teflon fabric auditorium. This unique format produces some unusual acoustic properties and problems. The early reflection patterns from and around the stage are quite different from a normal enclosed proscenium theater. The Teflon walls and roof while effectively acoustically transparent at low and lower midfrequencies become highly reflective at high frequencies. This not only impacts the transmission of sound through the structure but also speech transmission and intelligibility within the auditorium. The hyperbolic curved?roof surfaces and flat parallel walls were found to cause undesirable sound focusing and reflections detrimental to speech intelligibility. The acoustics of the space was investigated by means of both directional and binaural time?domain spectrometry techniques as well as more traditional acoustic measures. The paper presents the results of these measurements and outlines the remedial treatments adopted.

2000-01-01T23:59:59.000Z

251

Sound Geothermal Corporation | Open Energy Information  

Open Energy Info (EERE)

energy Product: Sound Geothermal coporation helps provide information into geothermal pumps. References: Sound Geothermal Corporation1 This article is a stub. You can help...

252

Acoustic monitoring of severe weather in the Northeast Pacific Ocean.  

Science Journals Connector (OSTI)

Wind and rainfall are the principal physical processes responsible for the production of high?frequency (1–50 kHz) ambient sound in the ocean. The primary source of the sound is the resonant ringing of individual bubbles created during wave breaking and raindrop splashes. Larger bubbles (>300 ?m diameter) quickly return to the surface while smaller bubbles can be mixed downward at several meters. During severe weather a layer of smaller ambient bubble forms and effectively absorbs higher?frequency (>10 kHz) sound. These processes are revealed in a two?year record of ambient sound recorded from a subsurface mooring at 50N 145W in the NE Pacific Ocean as part of the Canadian SOLAS program. The passive acoustic signal of wind rain and ambient bubbleclouds are compared to the subsurface mooring data including data from an upward looking 200 kHz active sonar and a 300 kHz ADCP. The acoustic signatures of light moderate and heavy rainfall are superimposed on the signature of high wind demonstrating rainfall detection even in the presence of high wind. [Work supported by ONR Fisheries and Oceans Canada and the Canadian CFCAS NSERC.

2008-01-01T23:59:59.000Z

253

Acoustic cooling engine  

DOE Patents (OSTI)

An acoustic cooling engine with improved thermal performance and reduced internal losses comprises a compressible fluid contained in a resonant pressure vessel. The fluid has a substantial thermal expansion coefficient and is capable of supporting an acoustic standing wave. A thermodynamic element has first and second ends and is located in the resonant pressure vessel in thermal communication with the fluid. The thermal response of the thermodynamic element to the acoustic standing wave pumps heat from the second end to the first end. The thermodynamic element permits substantial flow of the fluid through the thermodynamic element. An acoustic driver cyclically drives the fluid with an acoustic standing wave. The driver is at a location of maximum acoustic impedance in the resonant pressure vessel and proximate the first end of the thermodynamic element. A hot heat exchanger is adjacent to and in thermal communication with the first end of the thermodynamic element. The hot heat exchanger conducts heat from the first end to portions of the resonant pressure vessel proximate the hot heat exchanger. The hot heat exchanger permits substantial flow of the fluid through the hot heat exchanger. The resonant pressure vessel can include a housing less than one quarter wavelength in length coupled to a reservoir. The housing can include a reduced diameter portion communicating with the reservoir. The frequency of the acoustic driver can be continuously controlled so as to maintain resonance.

Hofler, Thomas J. (Los Alamos, NM); Wheatley, John C. (Los Alamos, NM); Swift, Gregory W. (Santa Fe, NM); Migliori, Albert (Santa Fe, NM)

1988-01-01T23:59:59.000Z

254

Acoustic well cleaner  

DOE Patents (OSTI)

A method and apparatus are disclosed for cleaning the wellbore and the near wellbore region. A sonde is provided which is adapted to be lowered into a borehole and which includes a plurality of acoustic transducers arranged around the sonde. Electrical power provided by a cable is converted to acoustic energy. The high intensity acoustic energy directed to the borehole wall and into the near wellbore region, redissolves or resuspends the material which is reducing the permeability of the formation and/or restricting flow in the wellbore.

Maki, Jr., Voldi E. (11904 Bell Ave., Austin, TX 78759-2415); Sharma, Mukul M. (Dept. of Petroleum Engr. Univ. of Texas, Austin, TX 78712)

1997-01-21T23:59:59.000Z

255

Acoustical heat pumping engine  

DOE Patents (OSTI)

The disclosure is directed to an acoustical heat pumping engine without moving seals. A tubular housing holds a compressible fluid capable of supporting an acoustical standing wave. An acoustical driver is disposed at one end of the housing and the other end is capped. A second thermodynamic medium is disposed in the housing near to but spaced from the capped end. Heat is pumped along the second thermodynamic medium toward the capped end as a consequence both of the pressure oscillation due to the driver and imperfect thermal contact between the fluid and the second thermodynamic medium. 2 figs.

Wheatley, J.C.; Swift, G.W.; Migliori, A.

1983-08-16T23:59:59.000Z

256

Application of the Transmission Line Matrix method for outdoor sound propagation modelling Part 2: Experimental validation using  

E-Print Network (OSTI)

Application of the Transmission Line Matrix method for outdoor sound propagation modelling ­ Part 2 Received in revised form 9 July 2013 Accepted 23 July 2013 Keywords: Meso-NH Transmission Line Matrix model-domain acoustic model is based on the Transmission Line Matrix method. Its develop- ment has also been promoted

Ribes, Aurélien

257

Sound Studies Meets Deaf Studies  

E-Print Network (OSTI)

Sound studies and Deaf studies may seem at first impression to operate in worlds apart. We argue in this article, however, that similar renderings of hearing, deafness, and seeing as ideal types - and as often essentialized ...

Friedner, Michele Ilana

258

The Acoustic and Auditory Contexts of Human Behavior  

E-Print Network (OSTI)

practices or worldviews. Soundscapes: Environment and Sound Approaches to conceptualizing the social roles of sound have been mapped mostly in terms of modern industrialized and urban conceptions of auditory environments, or soundscapes (Schafer 1994 (1977... become archaeological sites, which can then be used to inform understandings of the contexts in which sound would have been produced and perceived by people and other entities. In addition to Geographic Information System (GIS) and other surveying...

Blake, Elizabeth C.; Cross, Ian

2014-01-01T23:59:59.000Z

259

Hypersonic acoustic excitations in binary colloidal crystals: Big versus small hard sphere control  

E-Print Network (OSTI)

Hypersonic acoustic excitations in binary colloidal crystals: Big versus small hard sphere control January 2007 The phononic band structure of two binary colloidal crystals, at hypersonic frequencies of light photonic crystals 2 and sound at hypersonic frequencies.3 The propa- gation of phonons

Schofield, Andrew B.

260

10.1098/rspa.2002.1063 Acoustic resonances in the bubble plume  

E-Print Network (OSTI)

10.1098/rspa.2002.1063 Acoustic resonances in the bubble plume formed by a plunging water jet to investigate the near-field sound from an axisym- metric conical bubble plume formed by a continuous vertical to coherent collective oscillations of the bubbles within the plume, that is to say, the biphasic bubbly

Buckingham, Michael

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Acoustic resonances in the bubble plume formed by a plunging water jet  

Science Journals Connector (OSTI)

...low-frequency acoustic signature of the bubble plume in the tank. pressure...sound-pressure field from the bubble plume at frequencies up to...the plume. As a check on the stability of the peaks in the spectrum...hydrophone was moved relative to the bubble plume, and the eigenfrequencies...

2003-01-01T23:59:59.000Z

262

2011 Intensity -1 INTENSITY OF SOUND  

E-Print Network (OSTI)

the rate at which energy is passing a certain point. This concept involves sound intensity. Consider the sound intensity. Recall the time rate of energy transfer is called "power". Thus, sound intensity2011 Intensity - 1 INTENSITY OF SOUND The objectives of this experiment are: · To understand

Glashausser, Charles

263

Processing of Prosthetic Heart Valve Sounds from Anechoic Tank Measurements  

SciTech Connect

People with serious cardiac problems have had their life span extended with the development of the prosthetic heart valve. However, the valves operate continuously at approximately 39 million cycles per year and are therefore subject to structural failures either by faulty design or material fatigue. The development of a non-invasive technique using an acoustic contact microphone and sophisticated signal processing techniques has been proposed and demonstrated on limited data sets. In this paper we discuss an extension of the techniques to perform the heart valve tests in an anechoic like. Here the objective is to extract a ''pure'' sound or equivalently the acoustical vibration response of the prosthetic valves in a quiet environment. The goal is to demonstrate that there clearly exist differences between values which have a specific mechanical defect known as single leg separation (SLS) and non-defective valves known as intact (INT). We discuss the signal processing and results of anechoic acoustic measurements on 50 prosthetic valves in the tank. Finally, we show the results of the individual runs for each valve, point out any of the meaningful features that could be used to distinguish the SLS from INT and summarize the experiments.

Candy, J V; Meyer, A W

2001-03-20T23:59:59.000Z

264

History of engineering acoustics  

Science Journals Connector (OSTI)

At the Providence RI meeting in December 1955 it was proposed to add three new technical committees to the original seven established about a year earlier. Two of the new ones Audio Engineering and Electroacoustics and Sonic and Ultrasonic Engineering are precursors of the present Engineering Acoustics Technical Committee. In 1961 the name of the former committee was shortened to Electroacoustics and I began to attend their meetings. In 1964 the scope of the committee was broadened and its present name of Engineering Acoustics adopted. Early repeatable experiments in engineering acoustics have been attributed to Benjamin Franklin and mostly anecdotal evidence exists before that. Modern developments involve interdisciplinary involvements with all acoustics and specifically with the discovery of new materials applications of their properties and inventions of a wide variety of devices for producing receiving and using acoustics. Henry Joule Bell Berliner Edison the Curie brothers DeForest and Fessenden will be among those noted with some related recognition of them by the Engineering Acoustics TC.

Stanley L. Ehrlich

2000-01-01T23:59:59.000Z

265

Puget Sound Area Electric Reliability Plan : Draft Environmental Impact State.  

SciTech Connect

The Puget Sound Area Electric Reliability Plan Draft Environmental Impact Statement (DEIS) identifies the alternatives for solving a power system problem in the Puget Sound area. This Plan is undertaken by Bonneville Power Administration (BPA), Puget Sound Power Light, Seattle City Light, Snohomish Public Utility District No. 1 (PUD), and Tacoma Public Utilities. The Plan consists of potential actions in Puget Sound and other areas in the State of Washington. A specific need exists in the Puget Sound area for balance between east-west transmission capacity and the increasing demand to import power generated east of the Cascades. At certain times of the year, there is more demand for power than the electric system can supply in the Puget Sound area. This high demand, called peak demand, occurs during the winter months when unusually cold weather increases electricity use for heating. The existing power system can supply enough power if no emergencies occur. However, during emergencies, the system will not operate properly. As demand grows, the system becomes more strained. To meet demand, the rate of growth of demand must be reduced or the ability to serve the demand must be increased, or both. The plan to balance Puget Sound's power demand and supply has these purposes: The plan should define a set of actions that would accommodate ten years of load growth (1994--2003). Federal and State environmental quality requirements should be met. The plan should be consistent with the plans of the Northwest Power Planning Council. The plan should serve as a consensus guideline for coordinated utility action. The plan should be flexible to accommodate uncertainties and differing utility needs. The plan should balance environmental impacts and economic costs. The plan should provide electric system reliability consistent with customer expectations. 29 figs., 24 tabs.

United States. Bonneville Power Administration.

1991-09-01T23:59:59.000Z

266

Acoustic Monitor for Liquid-Solid Slurries Measurements at Low Weight Fractions  

SciTech Connect

Our effort in this project is to develop an acoustic monitor for accurate, real-time characterization of the size and weight fractions of solids in slurries for process monitoring and to determine the optimal timing for slurry transfers. This capability will be valuable in the Savannah River Site accelerated clean-up program. Our scientific work during the first research period developed a theory, supported by experiments, to describe sound attenuation of solids in suspensions in the presence of bubbles, which permits us to determine the solid-liquid weight percent. Engineering developments during the second research period led to the design, construction, and demonstration, in our laboratories, of the Syracuse Acoustic Monitor (SAM) system that measures weight percent solids accurately in slurries of 0.5 to 8.0 weight percent on-line and in real-time. Also, we had shown the potential for these measurements in solid-gas-liquid slurries by removing the interference due to the presence of gas bubbles.

Taviarides, Lawrence L.

2005-06-01T23:59:59.000Z

267

Design and implementation of an underwater sound recording device  

SciTech Connect

The purpose of this study was to design and build two versions of an underwater sound recording device. The device designed is referred to as the Underwater Sound Recorder (USR), which can be connected to one or two hydrophones or other underwater sound sensors. The URS contains a 26 dB preamplifier and a user selectable gain that permits additional amplification of input to the system from 26 dB to 46 dB. Signals within the frequency range up to 15 kHz may be recorded using the USR. Examples of USR applications are monitoring underwater processes that have the potential to create large pressure waves that could potentially harm fish or other aquatic life, such as underwater explosions or pile driving. Additional applications are recording sound generated by vessels or the vocalizations of some marine mammals, such as the calls from many species of whales.

Martinez, Jayson J.; Myers, Joshua R.; Carlson, Thomas J.; Deng, Zhiqun; Rohrer, John S.; Caviggia, Kurt A.

2011-09-19T23:59:59.000Z

268

Thermoacoustic sound projectors using carbon nanotubes and other nanostructures  

Science Journals Connector (OSTI)

The application of solid-state fabricated carbon nanotube sheets as thermoacoustic (TA) projectors is extended from air to underwater applications. Due to non-resonant sound generation the emission spectrum of nanotube sheets in air or underwater varies smoothly over a wide frequency range 1-105 Hz. Encapsulating the nanotube sheet projectors using inert gases with low heat capacity provided attractive performance at needed low frequencies as well as a realized energy conversion efficiency in air of 0.2% and 1.5% underwater which can be enhanced by further increasing the modulation temperature. We suggest enhancement of sound generation efficiency of encapsulated device by using high quality resonant acoustical windows and modulation of high frequency carrier current with a low frequency resonant envelope. Applications of TA projectors for high power sonar arrays and transparent flexible loudspeakers will be discussed. Finally the alternative nanostructures for excitation of thermoacoustic sound waves will be surveyed. [We gratefully acknowledge support by Office of Naval Research grant N00014-13-1-0180.

Ali E. Aliev

2013-01-01T23:59:59.000Z

269

Acoustic propagation characteristics of the estuarine salt wedge  

Science Journals Connector (OSTI)

The estuarine environment often hosts a salt wedge—a layer of denser seawater advected by the rising tide under fresh water discharged by the river. The nature of the stratification is a function of the tide's range and speed of advance river discharge volumetric flow rate and river mouth morphology. The competing effects of temperature and salinity on sound speed present the question: Is the salt wedge acoustically observable? Using temperature and salinity profiles collected in situ numerical results show that the salt wedge can impact acoustic propagation. Acoustically this environment consists of two isospeed layers separated by a thin gradient. While this three-layer very shallow water acoustic waveguide is typically dominated by high angle multipath propagation refraction occurring in the gradient layer allows some low-angle energy from near-surface sources to be trapped in the upper layer. Acoustic fluctuations observed at an upstream or downstream receiver depend upon the interaction between the advancing and receding tide and the river discharge which can include the presence of internal waves propagating along the top of the salt wedge.

2013-01-01T23:59:59.000Z

270

Acoustic propagation characteristics of the estuarine salt wedge  

Science Journals Connector (OSTI)

The estuarine environment often hosts a salt wedge-a layer of denser seawater advected by the rising tide under fresh water discharged by the river. The nature of the stratification is a function of the tide's range and speed of advance river discharge volumetric flow rate and river mouth morphology. The competing effects of temperature and salinity on sound speed present the question: Is the salt wedge acoustically observable? Using temperature and salinity profiles collected in situ numerical results show that the salt wedge can impact acoustic propagation. Acoustically this environment can be approximated by two isospeed layers separated by a thin gradient. While this three-layer very shallow water acoustic waveguide is typically dominated by high angle multipath propagation refraction occurring in the gradient layer allows low-angle energy from near-surface sources to be trapped above the gradient and creates a shadow zone below the gradient. Energy from near-bottom sources is refracted to higher angles and attenuated more quickly. Acoustic fluctuations observed at an upstream/downstream receiver depend upon the presence/absence of bedforms and the interaction between the advancing/receding tide and the river discharge which can include the presence of internal waves propagating along the top of the salt wedge.

D. B. Reeder

2013-01-01T23:59:59.000Z

271

Laboratory experiments as demos and projects in the underwater acoustics and sonar course  

Science Journals Connector (OSTI)

Underwater Acoustics and Sonar (SP411) is a 3?h course that is typically offered to Midshipmen in their senior year. General science majors take the course in the fall while the oceanography majors enroll in the spring. A sprinkling of physics electrical engineers ocean engineers and systems majors also populate the course (totaling ?110 students/yr). Since this course is offered without a lab the ‘‘in?class’’ experience has been enhanced with the development (over many years) of our demo carts which surround the classroom. Although Friday is our major ‘‘demo day ’’ demos are performed throughout the week. They motivate the students’ ‘‘out?of?class’’ experimental projects. Demos include: (a) waves on slinkies; (b) Fourier analysis of tones in noise homemade musical instruments; (c) harmonic synthesis; (d) receiver operating characteristics from processed signals in noise; (e) two?element and loudspeaker beam patterns; (f) sound speed versus temperature in water; (g) target strength versus angle of a model sub; (h) Ref. coef. from an Al/water interface; (i) PC?IMAT (interactive multisensor analysis training) simulations of array steering ray tracing active sonar propagation loss; and (j) FM detection and Doppler effects. Students get involved with the measurements have fun and their understanding of underwater sound is greatly enhanced.

Elizabeth L. Simmons; Murray S. Korman

1999-01-01T23:59:59.000Z

272

Investigation of user complaints of sound masking delivered from underfloor air distribution grilles.  

Science Journals Connector (OSTI)

A LEED?Gold certified government building includes six floors of open?plan office space that are equipped with electronic sound masking delivered from a raised floor having under?floor air distribution (UFAD). Results of user polling show mixed results for acoustic satisfaction with significant complaints about speech privacy and noise from the systems interfering with users’ ability to work. This research focuses on this dissatisfaction the general conflict between speech privacy ease of verbal communication and acceptance of noise?generating treatments. Little research has been done on masking delivered via UFAD so it was also desired to further the understanding of this design as part of a larger research program by the Federal government on Green Buildings. Specific objectives were to develop and test possible remedies for this system and improve planning of future facilities that may have masking via UFAD. On?site measurements of masking and HVAC spectra as well as noise reduction and observations for various conditions were made. Post?measurement data analysis was conducted and experimental remedies were developed and tested. The results and recommendations will be presented.

Mark Rogers

2011-01-01T23:59:59.000Z

273

Pressure Dependence of High?Frequency Sound Attenuation in the Deep Pacific Ocean  

Science Journals Connector (OSTI)

Vertical and horizontal acoustic paths located in the Pacific Ocean between depths of 910 and 3350 m have been utilized to determine the attenuation of sound at a nominal frequency of 75 kHz. Results from these two different geometries show that predicted values exceed the observed magnitudes of acoustic attenuation at this frequency and at these depths. At 3350 m the predicted value is 22.7 dB/km vs a measured value of 13.3±0.5 dB/km a discrepancy of more than 9 dB. Furthermore increasing pressure reduces the attenuation a fact which supports the work of Fisher [J. Acoust. Soc. Amer. 38 805 (1965)] in contrast to that of Kester and Pytkowicz [Geochimica et Cosmochimica Acta 34 1039 (1970)]. However the amount of reduction is larger than previously suspected by more than 80% [This paper represents results of research sponsored by the Office of Naval Research.

H. F. Bezdek

1972-01-01T23:59:59.000Z

274

Acoustical observation of the estuarine salt wedge at low-to-mid-frequencies  

Science Journals Connector (OSTI)

The estuarine environment often hosts a salt wedge the stratification of which is a function of the tide's range and speed of advance river discharge volumetric flow rate and river mouth morphology. Competing effects of temperature and salinity on sound speed control the degree of acoustic refraction occurring along an acoustic path. A field experiment was carried out in the Columbia River to test the hypothesis that the estuarine salt wedge is acoustically observable in terms of low-to-mid-frequency acoustic propagation. Linear frequency-modulated (LFM) acoustic signals in the 500–2000 Hz band were collected during the advance and retreat of the salt wedge during May 27–28 2013. Results demonstrate that the three-dimensional salt wedge front is the dominant physical feature controlling acoustic propagation in this environment: received signal energy is relatively stable under single-medium conditions before and after the passage of the salt wedge front but suffers a 10–15 dB loss as well as increased variance during salt wedge front passage due to 3D refraction and scattering. Physical parameters (i.e. temperature salinity current and turbulence) and acoustic propagation modeling corroborate and inform the acoustic observations.

2014-01-01T23:59:59.000Z

275

Measurement of sound speed vs. depth in South Pole ice: pressure waves and shear waves  

SciTech Connect

We have measured the speed of both pressure waves and shear waves as a function of depth between 80 and 500 m depth in South Pole ice with better than 1% precision. The measurements were made using the South Pole Acoustic Test Setup (SPATS), an array of transmitters and sensors deployed in the ice at the South Pole in order to measure the acoustic properties relevant to acoustic detection of astrophysical neutrinos. The transmitters and sensors use piezoceramics operating at {approx}5-25 kHz. Between 200 m and 500 m depth, the measured profile is consistent with zero variation of the sound speed with depth, resulting in zero refraction, for both pressure and shear waves. We also performed a complementary study featuring an explosive signal propagating vertically from 50 to 2250 m depth, from which we determined a value for the pressure wave speed consistent with that determined for shallower depths, higher frequencies, and horizontal propagation with the SPATS sensors. The sound speed profile presented here can be used to achieve good acoustic source position and emission time reconstruction in general, and neutrino direction and energy reconstruction in particular. The reconstructed quantities could also help separate neutrino signals from background.

IceCube Collaboration; Klein, Spencer

2009-06-04T23:59:59.000Z

276

Spacetime transformation acoustics  

E-Print Network (OSTI)

A recently proposed analogue transformation method has allowed the extension of transformation acoustics to general spacetime transformations. We analyze here in detail the differences between this new analogue transformation acoustics (ATA) method and the standard one (STA). We show explicitly that STA is not suitable for transformations that mix space and time. ATA takes as starting point the acoustic equation for the velocity potential, instead of that for the pressure as in STA. This velocity-potential equation by itself already allows for some transformations mixing space and time, but not all of them. We explicitly obtain the entire set of transformations that do not leave its form invariant. It is in these cases that ATA shows its true potential, allowing for building a transformation acoustics method that enables the full range of spacetime transformations. We provide an example of an important transformation which cannot be achieved with STA. Using this transformation, we design and simulate an acoustic frequency converter via the ATA approach. Furthermore, in those cases in which one can apply both the STA and ATA approaches, we study the different transformational properties of the corresponding physical quantities.

C. García-Meca; S. Carloni; C. Barceló; G. Jannes; J. Sánchez-Dehesa; A. Martínez

2014-07-08T23:59:59.000Z

277

Inter?laboratory variation in sound power levels in qualified reverberant rooms.  

Science Journals Connector (OSTI)

Reverberant acoustic test facilities can be qualified to determine the sound power levels of broadband and tonal noise sources using the procedures defined in Air?Conditioning Heating and Refrigeration Institute (AHRI) Std. 220 “Sound Power Testing Using Reverberant Rooms for HVAC Equipment.” Member companies from AHRI’s Technical Committee on Sound participated in a round robin test program in which tonal noise sources were shipped to and tested in a number of qualified reverberant rooms. This report summarizes the results of this effort. The mean and standard deviations of the sound power levels for multiple locations/orientations of the noise sources in each facility and for all facilities are presented. The standard deviations as a function of frequency for these sources were found to be generally less than the values established for broadband sources and therefore less than those allowed for tonal sources. Based on the comparisons of round robin test results accurate determinations of sound power levels can be made using the substitution method in rooms qualified in accordance with AHRI Std. 220 Technical Committee on Sound Air?Conditioning Heating and Refrigeration Institute

Robert Stabley

2009-01-01T23:59:59.000Z

278

Autonomous adaptive acoustic relay positioning  

E-Print Network (OSTI)

We consider the problem of maximizing underwater acoustic data transmission by adaptively positioning an autonomous mobile relay so as to learn and exploit spatial variations in channel performance. The acoustic channel ...

Cheung, Mei Yi, S.M. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

279

Achieving acoustical satisfaction in a green building  

Science Journals Connector (OSTI)

The Carnegie Institution’s Global Ecology Research Center at Stanford University has garnered many accolades including the AIA’s Excellence in SustainabilityAward. This building incorporates many ‘‘green’’ and energy?saving design features mechanical systems and materials. The occupants of this facility have given it high marks in U.C. Berkeley’s Center for the Built Environment’s (CBE) survey of buildings. Staff at the Global Ecology Research Center are shown to be more satisfied with their acoustical environment than occupants of other green buildings surveyed by CBE. Measured acoustical data for speech privacy in open plan and enclosed conference rooms will be presented along with descriptions of acoustical design attributes for the building.

2006-01-01T23:59:59.000Z

280

Active micromixer using surface acoustic wave streaming  

DOE Patents (OSTI)

An active micromixer uses a surface acoustic wave, preferably a Rayleigh wave, propagating on a piezoelectric substrate to induce acoustic streaming in a fluid in a microfluidic channel. The surface acoustic wave can be generated by applying an RF excitation signal to at least one interdigital transducer on the piezoelectric substrate. The active micromixer can rapidly mix quiescent fluids or laminar streams in low Reynolds number flows. The active micromixer has no moving parts (other than the SAW transducer) and is, therefore, more reliable, less damaging to sensitive fluids, and less susceptible to fouling and channel clogging than other types of active and passive micromixers. The active micromixer is adaptable to a wide range of geometries, can be easily fabricated, and can be integrated in a microfluidic system, reducing dead volume. Finally, the active micromixer has on-demand on/off mixing capability and can be operated at low power.

Branch; Darren W. (Albuquerque, NM), Meyer; Grant D. (Ithaca, NY), Craighead; Harold G. (Ithaca, NY)

2011-05-17T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Classification of heart valve condition using acoustic measurements  

SciTech Connect

Prosthetic heart valves and the many great strides in valve design have been responsible for extending the life spans of many people with serious heart conditions. Even though the prosthetic valves are extremely reliable, they are eventually susceptible to long-term fatigue and structural failure effects expected from mechanical devices operating over long periods of time. The purpose of our work is to classify the condition of in vivo Bjork-Shiley Convexo-Concave (BSCC) heart valves by processing acoustic measurements of heart valve sounds. The structural failures of interest for Bscc valves is called single leg separation (SLS). SLS can occur if the outlet strut cracks and separates from the main structure of the valve. We measure acoustic opening and closing sounds (waveforms) using high sensitivity contact microphones on the patient`s thorax. For our analysis, we focus our processing and classification efforts on the opening sounds because they yield direct information about outlet strut condition with minimal distortion caused by energy radiated from the valve disc.

Clark, G. [Lawrence Livermore National Lab., CA (United States)

1994-11-15T23:59:59.000Z

282

Aircraft tracking by means of the Acoustical Doppler Effect  

Science Journals Connector (OSTI)

The present paper presents a passive acoustic method for aircraft tracking. The Acoustical Doppler Effect, characteristic of signals received by a mesh of spatially distributed microphones is the basis of the method. A one-dimensional version of the Ambiguity function permits the calculation of the frequency stretch factor that exists between the sound signals received by a pair of microphones. The expression for this frequency stretch is a function of the aircraft position and velocity which are estimated by a Genetic Algorithm. The method is suitable for all kinds of aircraft and requires only seven microphones plus the prior knowledge of only the aircraft position and velocity at a given time. Results are given for a simulation test of a 3D straight trajectory of the aircraft and for a sound-propagation model which considers geometrical spreading and atmospheric absorption of sound for a homogeneous medium. The influence of the atmospheric absorption is evaluated and the independence of the method with respect to microphone distribution is proven. The performance of the tracking method has also been evaluated in front of possible inaccuracy on the microphones synchronization.

Sara R. Martín; Meritxell Genescà; Jordi Romeu; Teresa Pàmies

2013-01-01T23:59:59.000Z

283

Measurement of sound generation in thermoacoustic oscillations  

Science Journals Connector (OSTI)

...curves for a thermoacoustic prime mover. J. Acoust. Soc. Am. 98, 14011404. Ceperley, P. H. 1979 A pistonless Stirling engine--the traveling wave heat engine. J. Acoust. Soc. Am. 66, 15081513. Gifford, W. E. & Longsworth, R...

1998-01-01T23:59:59.000Z

284

Acoustic and seismic measurement of ice processes  

Science Journals Connector (OSTI)

As sea ice responds to environmental forcing it deforms leading to the storage of strain energy. When mechanical failure occurs most of this energy is dissipated through fracturing but a small portion radiates as seismic and acoustic waves. These waves provide useful signals for sensing the failure process in the ice. In a recent ice mechanics experiment conducted north of Prudhoe Bay (SIMI ’94) a large number of ice failure events were observed using geophone and hydrophone arrays. Preliminary results are presented including a large?scale tensile fracture test and naturally occurring sounds near a closing lead. For the artificial fracture the acoustic signals allow determination of cracking rate fracture advance and crack propagation velocities. The overall crack propagation speed is estimated to be of order 50 m?s?1; maximum cracking activities occur prior to peak loading. In the second data set the naturally occurring stick?slip process was observed as two ice sheets moved against each other in a closing lead. A wide range of frequencies can occur simultaneously representing different components of the sliding and slipping mechanisms.

David M. Farmer; Yunbo Xie

1995-01-01T23:59:59.000Z

285

PP-6 Puget Sound Power & Light Company | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Puget Sound Power & Light Company PP-6 Puget Sound Power & Light Company Presidential permit authorizing Puget Sound Power & Light Company to construct, operate, and maintain...

286

Multi-level acoustic modeling for automatic speech recognition  

E-Print Network (OSTI)

Context-dependent acoustic modeling is commonly used in large-vocabulary Automatic Speech Recognition (ASR) systems as a way to model coarticulatory variations that occur during speech production. Typically, the local ...

Chang, Hung-An, Ph. D. Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

287

Progress in Fiber Optical Acoustic and Seismic Sensing  

Science Journals Connector (OSTI)

A review of the progress in fiber optic acoustic and seismic sensor systems is presented. Common advancements in areas such as multiplexing are covered as well as specific progress in...

Kirkendall, Clay; Cole, James H; Tveten, Alan B; Dandridge, Anthony

288

AERIAL ACOUSTIC COMMUNICATIONS Cristina Videira Lopes  

E-Print Network (OSTI)

through the sound of TV and radio that can be picked up by devices at home or in the car; transferring error, the minimization of the required bandwidth and the minimization of the required power [1]. Under, wind or water drops. 2. The systems are to be deployed in ordinary hardware. We should utilize

Aguiar, Pedro M. Q.

289

3D acoustic imaging applied to the Baikal Neutrino Telescope  

E-Print Network (OSTI)

A hydro-acoustic imaging system was tested in a pilot study on distant localization of elements of the Baikal underwater neutrino telescope. For this innovative approach, based on broad band acoustic echo signals and strictly avoiding any active acoustic elements on the telescope, the imaging system was temporarily installed just below the ice surface, while the telescope stayed in its standard position at 1100 m depth. The system comprised an antenna with four acoustic projectors positioned at the corners of a 50 meter square; acoustic pulses were "linear sweep-spread signals" - multiple-modulated wide-band signals (10-22 kHz) of 51.2 s duration. Three large objects (two string buoys and the central electronics module) were localized by the 3D acoustic imaging, with a accuracy of ~0.2 m (along the beam) and ~1.0 m (transverse). We discuss signal forms and parameters necessary for improved 3D acoustic imaging of the telescope, and suggest a layout of a possible stationary bottom based 3D imaging setup. The presented technique may be of interest for neutrino telescopes of km3-scale and beyond, as a flexible temporary or as a stationary tool to localize basic telescope elements, while these are completely passive.

K. G. Kebkal; R. Bannasch; O. G. Kebkal; A. I. Panfilov; R. Wischnewski

2008-11-07T23:59:59.000Z

290

Sonic facade, creating a sounding architecture  

E-Print Network (OSTI)

While architecture inherently makes sound when people and the environment interact with it, architects seldom orchestrate a building to produce sound. This thesis proposes a sonic facade that turns an existing building ...

Granville, Alina (Alina T.)

2012-01-01T23:59:59.000Z

291

Investigations of stage acoustics at the Sydney Opera House Concert Hall  

Science Journals Connector (OSTI)

Improvements to onstage hearing conditions were made at the Sydney Opera House Concert Hall during a series of acoustics trials conducted during September 2009. During the acoustic trials physical changes were made to reflective surfaces around the platform and an active acoustics system was demonstrated. Taken together the temporary changes had a positive influence on hearing conditions during both rehearsals and performances by the Sydney Symphony Orchestra and Sydney Philharmonia. This paper reviews the strategies used to implement the improvements to stage acoustics and discusses the unique techniques used to evaluate the stage acoustics both subjectively and objectively.

Timothy E. Gulsrud

2011-01-01T23:59:59.000Z

292

Pressure dependence of sound attenuation in the Pacific Ocean  

Science Journals Connector (OSTI)

Measurements of the attenuation of sound at a nominal frequency of 75 kHz have been made over vertical and horizontal acoustic paths located between depths of 700 and 3400 m in the Pacific Ocean. Results indicate that the equation used to predict attenuation overestimates the values actually encountered at these frequencies and depths. (Compare calculated values of 27.3 and 22.7 dB/km to measured values of 19.9±0.5 and 13.3±0.5 dB/km at depths of 910 and 3350 m respectively.) The measurements definitely establish the decrease of attenuation with increasing pressure. However the magnitude of the pressure coefficient of attenuation is almost twice as large as previously suspected (12.3±1.1×10?4/bar or approximately 12.3×10?4/atm compared to 6.54×10?4/atm).

H. F. Bezdek

1973-01-01T23:59:59.000Z

293

Pitch Perception of Complex Sounds: Nonlinearity Revisited  

E-Print Network (OSTI)

The ability of the auditory system to perceive the fundamental frequency of a sound even when this frequency is removed from the stimulus is an interesting phenomenon related to the pitch of complex sounds. This capability is known as ``residue'' or ``virtual pitch'' perception and was first reported last century in the pioneering work of Seebeck. It is residue perception that allows one to listen to music with small transistor radios, which in general have a very poor and sometimes negligible response to low frequencies. The first attempt, due to Helmholtz, to explain the residue as a nonlinear effect in the ear considered it to originate from difference combination tones. However, later experiments have shown that the residue does not coincide with a difference combination tone. These results and the fact that dichotically presented signals also elicit residue perception have led to nonlinear theories being gradually abandoned in favour of central processor models. In this paper we use recent results from the theory of nonlinear dynamical systems to show that physical frequencies produced by generic nonlinear oscillators acted upon by two independent periodic excitations can reproduce with great precision most of the experimental data about the residue without resorting to any kind of central processing mechanism.

D. L. Gonzalez; L. Morettini; F. Sportolari; O. Rosso; J. H. E. Cartwright; O. Piro

1995-05-05T23:59:59.000Z

294

Acoustic studies of single?crystal high?temperature superconductors  

Science Journals Connector (OSTI)

The acoustic properties of single crystals of the high?temperature superconductor YBa 2 Cu 3 O 7 have been measured at temperatures between 0.1 and 300 K for frequencies near 103 and 109 Hz. In the GHz regime longitudinal modes have been studied for propagation directions parallel and perpendicular to the c axis. At Tc there is a discontinuity in the soundvelocities and their temperature derivatives from which the anisotropic strain dependences of Tc are obtained. In the kHz regime resonant excitation of flexural modes in thin reeds of YBa 2 Cu 3 O 7 crystals has permitted precise measurement of acoustic damping and dispersion. The temperature?dependent damping is characterized by at least five features associated with the relaxation of defects. At temperatures below 1 K the velocity of sound is consistent with the presence of a broad “glasslike” distribution of tunneling modes.

Brage Golding; W. H. Haemmerle; L. F. Schneemeyer

1988-01-01T23:59:59.000Z

295

E-Print Network 3.0 - airborne acoustical noise Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

and lidar sensors. Consequently, the methodology for instru- ment calibration, noise reduction... in the data processing sequence. For an acoustic system, ambient ... Source:...

296

E-Print Network 3.0 - acoustic remote sensing Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Sensor Web for Ocean Observation: System Design, Architecture, and Performance Summary: heat content and dynamics: integral constraints from acoustic remote sensing, ORION RFA...

297

Sound Propagation in Gross Mixtures  

Science Journals Connector (OSTI)

For low acoustic frequencies a mixture (a porous medium or a suspension) is shown to have an effective density which differs slightly from the density given by Archimedes' principle. This effective density is computed from a physically elementary consideration of viscous incompressible fluid flow. For higher frequencies pore or particle size in the mixture becomes comparable with the wavelength of shear waves in the fluid while still small compared with dilatational wavelength. The theory is extended to such frequencies through the known formula for the fluid's resistance to the oscillations of a rigid sphere. In both cases the effective compressibility of the mixture is taken to be the volume?average of the component compressibilities. From the effective density and compressibility the acoustic properties of the mixture are predicted. Predictions are compared with previous theories and with experimental results.

W. S. Ament

1953-01-01T23:59:59.000Z

298

Acoustic hygrometer. Final report  

SciTech Connect

The water vapor content for air in drier ducts, ovens, furnaces and the like is determined by a measurement of sound speed which is done by measuring the time difference between sound pulses reflected by two reflectors spaced a known distance apart in a guide tube. The transmitter-receiver is located at one end of the tube. The tube has enough number of holes to allow the hot moist air to get into the probe tube. A non-porous tube containing dry air placed in the same duct provides a similar measurement of dry-sound speed. The ratio of the two speeds of sound or the two measured time intervals is a simple function of the water vapor content practically independent of temperature thereby providing a very accurate measurement of water vapor content over an extremely wide range of temperatures. The sensor is accurate, immune to harsh environments, has an extremely low time constant, has absolutely no hysteresis and needs no calibration.

Shakkottai, P.; Kwack, E.Y.

1998-02-02T23:59:59.000Z

299

Advanced research in instrumentation and control technology: Acoustic parameter studies  

SciTech Connect

In the process of developing acoustic/ultrasonic instruments for coal conversion and combustion processes, there is a need to understand various complex relations between acoustic parameters and physical properties of coal/gas and coal/liquid media so that the instrument readings and measurement accuracy can be evaluated and new sensing techniques can be developed. The primary objective of this project is to examine the theory and perform measurements of acoustic/ultrasonic parameters in such coal media. The acoustic parameters of interest are sound speed, attenuation, scattering pattern, and resonance scattering, which relate directly or indirectly to coal concentration, particle size and distribution, and rheological and thermal properties. In summary, we have developed a laboratory technique for accurate attenuation measurement in highly viscous liquids and coal slurries. For pure liquids, the attenuation in low frequency (0.8 to 2 MHz) provides a direct measurement of fluid shear viscosity. For coal slurries of low concentration (<10% by weight) attenuation in the same frequency range still follows the variation of fluid viscosity. But, for slurries of higher coal concentration, anomalous attenuation may be measured, depending on the fluid structure, which is believed to be a micor-inhomogeneous medium. 8 refs., 5 figs., 1 tab.

Sheen, S.H.; Bobis, J.P.; Raptis, A.C.

1986-01-01T23:59:59.000Z

300

Insertion loss class—Enhancing the single number rating system for duct silencers  

Science Journals Connector (OSTI)

Single number rating systems have been used successfully to select architectural acoustics products for many years. Recently a single number rating system was proposed to evaluate sound attenuators in HVAC applications. The proposed system does not include the very low frequencies. This paper discusses the addition of the 31 Hz octave band to the proposed standard contour for calculating insertion loss class (ILC). A number of examples are shown using actual published silencer test data how the system can be applied to common HVAC noise problems.

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

High-frequency acoustic modes in an ionic liquid  

Science Journals Connector (OSTI)

High-frequency collective dynamics of the ionic liquid 1-hexyl-3-methylimidazolium bromide [C6C1im]Br has been investigated by molecular dynamics simulations. Time correlation functions of mass current fluctuations were calculated for several wavevectors and the dispersion curves of excitations ?(k) for longitudinal and transverse acoustic sound modes were obtained at different temperatures and pressures. Two different thermodynamic states have the same high-frequency sound velocity irrespective of the temperature provided that both have the same density. Partial time correlation functions of mass currents were calculated for the atoms belonging to the polar or the non-polar domains resulting from the heterogeneous structure of [C6C1im]Br. The partial correlation functions indicate that the polar domains are stiffer than the non-polar domains of the simulated ionic liquid.

Mauro C. C. Ribeiro

2013-01-01T23:59:59.000Z

302

Alternative acoustic environments for the generation of reverberation  

Science Journals Connector (OSTI)

The musicians and engineers who create popular recorded music view reverberation as a signal processingeffect to be added to any and all elements of a multitrack production. Devices such as digital reverbs spring reverbs and plate reverbs are tools of the recording trade synthesizing reverblike sounds for performance through loudspeakers. Acoustic reverberation makes its way into recorded music through the use of a reverb chamber. A small room is used to generate reverb. With cubic volume well below that of a performance hall it works the ‘‘other side’’ of the Sabine equation being built of highly sound reflective materials. A purpose?built room for the generation of reverb is a luxury not many studios can afford. Clever use of stairwells bathrooms and basements is easier on the recording studios balance sheet. This work evaluates the repurposing of these alternative spaces for the generation of reverb in popular recorded music.

2004-01-01T23:59:59.000Z

303

Doppler Effect removal based on instantaneous frequency estimation and time domain re-sampling for wayside acoustic defective bearing detector system  

Science Journals Connector (OSTI)

Abstract The phenomenon of Doppler Effect in the acoustic signal recorded by the wayside acoustic defective bearing detector (ADBD) leads to the difficulty for fault diagnosis of train bearings with a high moving speed, which is a barrier that would badly reduce the effectiveness of online defect detection. In order to improve the performance of condition monitoring of the bearings on a passing train with microphones amounted besides the railway, the elimination of the Doppler Effect should be solved firstly. An effective method for removing the Doppler Effect embedded in the source signal is presented in this paper. The Short Time Fourier Transform-Viterbi Algorithm (STFT-VA) is applied to obtain instantaneous frequency estimation of the distorted signal. According to the acoustic theory of Morse, the non-linear data fitting is then carried out to get the fitting instantaneous frequencies. The necessary parameters for time domain interpolation re-sampling, which is totally based on the kinematic analysis, are acquired from the fitting curve and the re-sampling sequence could be established in the time domain. As a result of the preceding steps, the fault diagnosis for the train bearings could be implemented with the restored signal. The effectiveness of this proposed method is verified by means of a simulation with three adjacent frequencies and an experiment with practical acoustic signals of train bearings with a crack on the outer race and the inner race. The results of the simulation and the experiment indicate that the proposed method has an excellent performance in removing Doppler Effect, and could be well employed to the condition monitoring and fault diagnosis of train bearings with a high moving speed.

Chao Wang; Fanrang Kong; Qingbo He; Fei Hu; Fang Liu

2014-01-01T23:59:59.000Z

304

Patch nearfield acoustic holography in a moving medium  

Science Journals Connector (OSTI)

Abstract To realize the accurate reconstruction of sound field in a moving medium under the condition of limited holographic aperture, a patch nearfield acoustic holography (NAH) in a moving medium is proposed. The proposed method not only reduces the influence caused by the limited aperture effects through sound field extrapolation, but also perfectly suits for sound field reconstruction in a moving medium by improving the shape of the modified Tikhonov regularization filter and the noise estimation method in accordance with flow effects. In the method, two cases that the flow direction is parallel to and perpendicular to the hologram surface are considered. Especially in the perpendicular case, the expression of the wavenumber component in the z direction is improved to make the proposed method suitable for the moving medium at a high Mach number. Simulations are investigated to examine the performance of the proposed method and show its advantages by comparing with NAH in a moving medium and the conventional patch NAH. It is found that, the proposed method is effective and robust at different flow velocities of the medium and different frequencies of the sound source.

Bi-Chun Dong; Chuan-Xing Bi; Xiao-Zheng Zhang; Yong-Bin Zhang

2014-01-01T23:59:59.000Z

305

Structures of resonators in a cavity for improving a sound insulation of a thin double-leaf panel  

Science Journals Connector (OSTI)

The specific acoustic problem of a double-leaf panel is a less sound insulation caused by a mass-air-mass resonance. For improving the sound insulation many studies have suggested Helmholtz resonators in the cavity which are tuned at the resonant frequency. They have measured and analyzed this problem of double-walls spaced with 100 mm thickness of air gap. They have suggested that the resonators improve the sound insulation to the resonant transmission and discussed its optimization for a gain by the resonators and structures set in the cavity. But it is unclear that those results can apply to sound insulation by a double grassing with 5 mm thickness of air gap which is often seen even as a thermal insulated window and whose air gap is quite thinner than that of the walls. Then this study measured effects of various resonators in the cavity for improving the sound insulation of thin double-leaf panels and discusses effects of structures and perforation ratio to the sound insulation. Moreover for analyzing the effects of resonators this study discusses measured results with theoretical studies of sound absorption models for resonators.

2013-01-01T23:59:59.000Z

306

Full-scale rocket motor acoustic tests and comparisons with empirical source models  

Science Journals Connector (OSTI)

Development of the next-generation space flight vehicles has prompted a renewed focus on rocket sound source characterization and near-field propagation modeling. Improved measurements of the noise near the rocket plume are critical for direct determination of the noise environment. They are also crucial in providing inputs to empirical models and in validating computational aeroacoustics models. NASA's SP-8072 acoustic load prediction model (1971) is a widely used method for predicting liftoff acoustics. The method implements two Distributed Source Methods (DSM-1 and DSM-2) which predict the loading as the sum of the radiated field from each source distributed along the plume. In this paper measurements of a static horizontal firing of an Alliant Techsystem (ATK) Orion 50S XLG are analyzed with respect to the historical data that drive the SP-8072 prediction models. Comparisons include total sound power and sound power spectrum and the distribution of the sound power and sound power spectrum along the length of the plume. Scalar pressure measurements yield reasonable agreement between the Orion-50S XLG data and both methods for undeflected plumes in the original SP-8072. However development of these comparisons has prompted significant questions regarding the underlying physics of the two methods.

Michael M. James; Kent L. Gee; Tracianne B. Neilsen

2014-01-01T23:59:59.000Z

307

Pulse combusted acoustic agglomeration apparatus and process  

DOE Patents (OSTI)

An improved apparatus and process for removal of particulates entrained in a gas stream are provided. The removal process employs a pulse combustor to provide an acoustic pressure wave to acoustically enhance bimodal agglomeration of particulates which may be collected and removed using a conventional separation apparatus. A particulate having a size different from the size of the particulate in the gas stream to be cleaned is introduced into the system to effectuate the bimodal process. The apparatus may be employed as a direct fired system for improved operation of gas-operated equipment such as a gas turbine, or may, alternatively, be employed as an add-on subsystem for combustion exhaust clean-up. Additionally, the added particulate may be a sorbent for effecting sorption of other contaminants such as sulfur. Various other particulates for contaminant removal may also be introduced into the system as exemplified by alkali-gettering agents.

Mansour, Momtaz N. (Columbia, MD)

1993-01-01T23:59:59.000Z

308

CFD-based application of the Nyquist criterion to thermo-acoustic instabilities  

Science Journals Connector (OSTI)

A novel approach for the analysis of self-excited instabilities in thermo-acoustic systems is proposed. Combining computational fluid dynamics with low-order acoustic modeling, the open-loop transfer function of the system under investigation is computed. ... Keywords: 02.30.Yy, 43.28.Kt, 43.35.Ud, 43.60.Bf, 47.50.Gj, 52.35.Dm, Computational fluid dynamics, Control theory, Instabilities, Thermo-acoustics

J. Kopitz; W. Polifke

2008-07-01T23:59:59.000Z

309

Acoustically enhanced remediation, Phase 2: Technology scaling  

SciTech Connect

Weiss Associates is conducting the following three phase program investigating the in-situ application of acoustically enhanced remediation (AER) of contaminated unconsolidated soil and ground water under both saturated and unsaturated conditions: Phase I-- laboratory scale parametric investigation; Phase II--technology Scaling; and Phase III--large scale field tests. AER addresses the need for NAPL (either lighter or denser than water: LNAPL or DNAPL, respectively) in high and low permeability sediments, and the remediation of other types of subsurface contaminants (e.g., metals, radionuclides) in low permeability soils. This program has been placed in the U.S. Department of Energy`s (DOE`s) DNAPL product. Phase I indicated that AER could be used to effectively remediate NAPL in high permeability soil, and that removal of NAPL from low permeability soil could be increased since the water flux through these soils was significantly increased. Phase II, Technology Scaling, the subject of this paper, focused on (1) evaluating the characteristics of an AER field deployment system, (2) developing DNAPL flow and transport performance data under acoustic excitation, (3) predicting the effect of acoustic remediation in three-dimensional unconsolidated hydrogeologic conditions, (4) conducting an engineering analysis of acoustical sources, and (5) identifying candidate field site(s) for large-scale field testing of the technology.

Iovenitti, J.L.; Hill, D.G. [Weiss Associates, Emeryville, CA (United States); Rynne, T.M.; Spadaro, J.F.; Hutchinson, W. [Scientific Applications and Research Associates, Inc., Huntington Beach, CA (United States); Illangasakere, T. [Colorado Univ., Boulder, CO (United States). Dept. of Civil, Environmental, and Architectural Engineering

1996-12-31T23:59:59.000Z

310

High frequency sound velocity in the glass former 2Ca(NO3)2?3KNO3: Molecular dynamics simulations  

Science Journals Connector (OSTI)

Molecular dynamics simulations of the fragile glass-forming liquid 2Ca(NO3)2?3KNO3 (CKN) were performed from its molten state at 800K down to its glassy state at 250K. Time correlation functions of mass current fluctuations were calculated in order to investigate sound waves of high wave vectors, 0.18sound velocity of CKN was obtained from the slope of the dispersion curve of excitation energy of acoustic modes, ?(k), as a function of temperature across the glass transition. The temperature dependence of the sound velocity of longitudinal acoustic modes is discontinuous in a range that is higher than the glass transition temperature Tg estimated from the T dependence of density and energy. This result demonstrates that the high frequency sound velocity probes the transition from liquidlike to solidlike regimes at a temperature higher than the Tg of the simulated material. The sound velocity of transverse acoustic (TA) modes presents discontinuity at the same value of the thermodynamic derived Tg. It is proposed that the distinct behavior of high frequency TA modes is due to fast reorientational motions of NO3? anions that are able to relieve local shear stresses.

Mauro C. C. Ribeiro

2007-04-06T23:59:59.000Z

311

Acoustic paramagnetic logging tool  

DOE Patents (OSTI)

New methods and apparatus are disclosed which allow measurement of the presence of oil and water in geological formations using a new physical effect called the Acoustic Paramagnetic Logging Effect (APLE). The presence of petroleum in formation causes a slight increase in the earth's magnetic field in the vicinity of the reservoir. This is the phenomena of paramagnetism. Application of an acoustic source to a geological formation at the Larmor frequency of the nucleons present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth3 s magnetic field in the vicinity of the oil bearing formation. Repetitively frequency sweeping the acoustic source through the Larmor frequency of the nucleons present (approx. 2 kHz) causes an amplitude modulation of the earth's magnetic field which is a consequence of the APLE. The amplitude modulation of the earth's magnetic field is measured with an induction coil gradiometer and provides a direct measure of the amount of oil and water in the excitation zone of the formation . The phase of the signal is used to infer the longitudinal relaxation times of the fluids present, which results in the ability in general to separate oil and water and to measure the viscosity of the oil present. Such measurements may be preformed in open boreholes and in cased well bores.

Vail, III, William B. (Bothell, WA)

1988-01-01T23:59:59.000Z

312

Cylindrical Acoustic Levitator/Concentrator  

NLE Websites -- All DOE Office Websites (Extended Search)

Cylindrical Acoustic Levitator/Concentrator Cylindrical Acoustic Levitator/Concentrator Cylindrical Acoustic Levitator/Concentrator A low-power, inexpensive acoustic apparatus for levitation and/or concentration of aerosols and small liquid/solid samples having particulates up to several millimeters in diameter in air or other fluids is described. Available for thumbnail of Feynman Center (505) 665-9090 Email Cylindrical Acoustic Levitator/Concentrator A low-power, inexpensive acoustic apparatus for levitation and/or concentration of aerosols and small liquid/solid samples having particulates up to several millimeters in diameter in air or other fluids is described. It is constructed from a commercially available, hollow cylindrical piezoelectric crystal which has been modified to tune the resonance frequency of the breathing mode resonance of the crystal to that

313

On the stability of long-range sound propagation through a structured ocean  

E-Print Network (OSTI)

Several acoustic experiments show a surprising degree of stability in wave fronts propagating over multi-megameter ranges through the ocean's sound channel despite the presence of random-like, sound speed fluctuations. Previous works have pointed out the existence of chaos in simplified ray models incorporating structure inspired by the true ocean environment. A ``predictability horizon'' has been introduced beyond which stable wave fronts cease to exist and point-wise, detailed comparisons between even the most sophisticated models and experiment may be limited for fundamental reasons. We find, by applying one of the simplified models, that for finite ranges, the fluctuations of the ray stabilities are very broad and consistent with lognormal densities. A fraction of the rays retain a much more stable character than the typical ray. This may be one of several possible mechanisms leading to greater than anticipated sound field stability. The lognormal ray stability density may underlie the recent, experimentally determined, lognormal density of wave field intensities [J. Acoust. Soc. Am. 105 (1999) 3202--18].

M. A. Wolfson; S. Tomsovic

2000-02-18T23:59:59.000Z

314

Acoustic emission during polymer crystallization  

Science Journals Connector (OSTI)

... .G.; part support to L.K.) Acoustic Emission, Special Technical Publication 505, ASTM, Philadelphia, 1971; Grabec, I. & Peterlin, A. J. Polymer Sci. ...

A. Galeski; L. Koenczoel; E. Piorkowska; E. Baer

1987-01-01T23:59:59.000Z

315

Development of a geothermal acoustic borehole televiewer  

SciTech Connect

Most geothermal wells are drilled in hard rock formations where fluid flow is through systems of open fractures. Productivity of these wells is usually determined by the extent of intersection of the wellbore with the fracture system. A need exists for fracture mapping methods and tools which can operate in a geothermal environment. In less hostile environments, the acoustic borehole televiewer has been shown to be a useful tool for determining location, orientation, and characterization of fractures as they intersect the borehole and for general wellbore and casing inspection. The development conducted at Sandia National Laboratories to adapt an acoustic borehole televiewer for operation in a geothermal environment is described. The modified instrument has been successfully tested at temperatures as high as 280/sup 0/C and pressures up to 5000 psi, and used successfully to map fractures and casing damage in geothermal wells.

Heard, F.E.; Bauman, T.J.

1983-08-01T23:59:59.000Z

316

Pulse combusted acoustic agglomeration apparatus and process  

DOE Patents (OSTI)

An improved apparatus and process for removal of particulates entrained in a gas stream are provided. The removal process employs a pulse combustor to provide an acoustic pressure wave to acoustically enhance agglomeration of particulates which may be collected and removed using a conventional separation apparatus. The apparatus may be employed as a direct fired system for improved operation of gas-operated equipment such as a gas turbine, or may, alternatively, be employed as an add-on subsystem for combustion exhaust clean-up. Additionally, added particulates may include a sorbent for effecting sorption of other contaminants such as sulfur. Various other particulates for contaminant removal may also be introduced into the system as exemplified by alkali-gettering agents.

Mansour, Momtaz N. (Columbia, MD); Chandran, Ravi (Ellicott City, MD)

1994-01-01T23:59:59.000Z

317

Reproductive strategies of Weddell seals in McMurdo Sound, Antarctica: relationship among vocalizations, behaviors, and social interactions  

E-Print Network (OSTI)

and their territories; whereas, mate attraction signals indicate the location and availability of potential mates (Bradbury & Vehrencamp 1998a). Males that are able to influence the behaviors and decisions of conspecifics by emitting such signals, and individuals...) stereotyped patterns of signals (Bradbury & Vehrencamp 1998b). Sounds have the advantage of traveling long distances, especially in aquatic environments, and require little energy expenditure. Therefore, acoustic displays have great potential...

Rousseau, Ludivine Blandine

2007-09-17T23:59:59.000Z

318

Micro audio directional system for portable multimedia devices  

Science Journals Connector (OSTI)

A micro audio directional system for portable multimedia devices is investigated as a novel loudspeaker which can provide privacy listening service. It can generates audible sound with high directivity in a narrow conical beam by an ultrasonic transducer array. A piezoelectric micromachined ultrasonic transducers (pMUT) array and a PZT ceramic wafer transducers array are presented respectively. The testing results of impedance, frequency response and sound pressure level characteristics are described and compared. A prototype with PZT ceramic wafer transducers array is constructed for mobile phone usage and its acoustic characteristics are measured. The experiment results indicate the feasibility of utilising the audio directional system with low power consumption and micro size in portable multimedia devices as well as in mobile phone.

Xuesheng Li; Limei Xu; Leon Xu

2012-01-01T23:59:59.000Z

319

Definition: Vertical Electrical Sounding Configurations | Open Energy  

Open Energy Info (EERE)

Sounding Configurations Sounding Configurations Jump to: navigation, search Dictionary.png Vertical Electrical Sounding Configurations A vertical electrical sounding (VES) is a DC resistivity survey which provides information regarding the change in apparent resistivity with depth. A quantitative interpretation of the results from VES measurements enable determination of the parameters for the geoelectric section.[1] Also Known As VES; Schlumberger Sounding References ↑ http://www.nga.com/Flyers_PDF/NGA_DC_Resistivity.pdf http://www.amazon.com/Principles-Electric-Borehole-Geophysics-Geochemistry/dp/0444529942 Ret LikeLike UnlikeLike You like this.Sign Up to see what your friends like. rieved from "http://en.openei.org/w/index.php?title=Definition:Vertical_Electrical_Sounding_Configurations&oldid=596183

320

Dynamic analysis of shells of revolution submerged in an acoustic medium by the finite element method  

E-Print Network (OSTI)

of the spherical shell transformation matrix relating (q} and (u) for an element generalized added mass matrix due to radiated pressure matrix relating (q) and (I) for an element unknown source strength velocity of sound in fluid coupled equivalent nodal load... A method 1s presented for the evaluation of the displacements and the surface pressure which are induced by the harmonic exc1tation of a shell of revolution submerged in an acoustic medium. The method utilizes a source distribution approach...

Ng, Chi Kin

1978-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Acoustic radiation from a plate with sinusoidally varying properties  

Science Journals Connector (OSTI)

The acoustic radiation produced by an infinite flat plate with sinusoidally varying properties and driven by a distributed load is presented. The plate is assumed to be thin with constant thickness but with stiffness varying sinusoidally along the axis. The analysis is an extension of the work previously reported [M. Pierucci J. Acoust. Soc. Am. Suppl. 1 79 S35 (1986)]. The analysis consists of solving the coupled fluid?structure equations with the added difficulty of having nonconstant coefficients. The system reduces to a convoluted equation which has been solved analytically. The results indicate the presence of acoustic pressure components radiating in directions that are related to the difference between the forcing function wavenumber and the wavenumber of the stiffness variation. Acoustic radiation patterns will be presented.

Mauro Pierucci

1987-01-01T23:59:59.000Z

322

Acoustical Standards Play a Key Role in Optimized Solutions  

Science Journals Connector (OSTI)

Acoustical standards are important to heating ventilation and air conditioning (HVAC) system manufacturers. Our participation in developing standards helps us by: (1) getting the right information to our customers; (2) avoiding conflicts between manufacturers and other organizations; and (3) preparing for changing system requirements. Being active in standards work helps us to agree with our customers on what is the correct information to provide. Providing accurate appropriate acoustical information for our solutions helps to make sure the system is applied correctly and increases the likelihood that customers will be satisfied with our systems.

Stephen J. Lind

2012-01-01T23:59:59.000Z

323

Electromagnetic Sounding Techniques | Open Energy Information  

Open Energy Info (EERE)

Electromagnetic Sounding Techniques Electromagnetic Sounding Techniques (Redirected from Electromagnetic Sounding Methods) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Electromagnetic Sounding Techniques Details Activities (1) Areas (1) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Ground Electromagnetic Techniques Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water

324

Puget Sound Clean Cities Petroleum Reduction Project  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

3 universities, 9 private businesses Overview Puget Sound Clean Cities Coalition Petroleum Reduction Project - DE-EE0002020 Project Objectives: * Reduce petroleum use in the...

325

Impact on acoustic propagation by internal waves and tides in the region of shelf and slope.  

Science Journals Connector (OSTI)

Internal waves (IWS) and tidal activities were investigated in the South China Sea (SCS) and the northeastern seas of Taiwan. These oceanic processes cause large fluctuations and impact on underwater acoustic propagation. These effects include two?dimensional (2?D) and three?dimensional (3?D) effects. The 2?D and 3?D effects are related to the angle between the directions of sound propagation and IW front. When the IW front are from 20 to 90 deg with respect to the acoustic propagation direction acoustic mode coupling is the dominant factor which could be sufficiently predicted by the N×2D simulations. Acoustic energy is exchanged between modes and is re?distributed among the water columns. However when the angles between the wave front and the acoustic wave propagation are 0–20 deg the horizontal refraction effect dominates over mode coupling and the fully 3?D calculation is needed. The acoustic energy would be refracted as a consequence resulting in energy focusing and defocusing. These effects are clearly seen by the series of data collected in the SCS and the region of Northern East of Taiwan. Computer modeling results are used to manifest experiment data results in this research. [This work is supported by National Science Council of Taiwan.

Chi?Fang Chen; Yung?Sheng Linus Chiu; Yuan?Ying Chang

2009-01-01T23:59:59.000Z

326

Some Applications of Meteorology to Underwater Ambient Noise Studies in Block Island Sound  

Science Journals Connector (OSTI)

Turbulent atmospheric boundary?layer theory is applied to wind observations made over a shallow?water embayment to explain variations in ambient noise levels. Broad?band ambient?noise data for sea states up to 3 obtained at a fixed receiving site are presented for a shallow water acoustic test range in Block IslandSound. Hourly wind?speed averages are analyzed by means of spectra and covariance functions in order to compare the frequency composition of the acoustic and meteorological data. The power spectrum computed from the record of ambient noise pressure level as a function of time has significant peaks centered on frequencies of 0.04 and 0.10. Similar peaks at the corresponding frequencies are present in the spectra of wind speeds. The results of this experiment suggest that for wind speed fluctuations of less than 0.33 nonlinear effects of the wind are relatively unimportant in the generation of ambient noise.

Llyod C. Huff; Robert G. Williams

1967-01-01T23:59:59.000Z

327

Structures of resonators in a cavity for improving a sound insulation of a thin double-leaf panel  

Science Journals Connector (OSTI)

The specific acoustic problem of a double-leaf panel is a less sound insulation caused by a mass-air-mass resonance. For improving the sound insulation many studies have suggested Helmholtz resonators in the cavity which are tuned at the resonant frequency. They have measured and analyzed this problem of double-walls spaced with 100 mm thickness of air gap. They have suggested that the resonators improve the sound insulation to the resonant transmission and discussed its optimization for a gain by the resonators and structures set in the cavity. But it is unclear that those results can apply to sound insulation by a double grassing with 5 mm thickness of air gap which is often seen even as a thermal insulated window and whose air gap is quite thinner than that of the walls. Then this study measured effects of various resonators in the cavity for improving the sound insulation of thin double-leaf panels and discusses effects of structures and perforation ratio to the sound insulation.

2013-01-01T23:59:59.000Z

328

Noise Sources and Room Acoustics of Closed Circuit Subsonic Wind Tunnels  

Science Journals Connector (OSTI)

The noise aspects of subsonic wind tunnels have been studied experimentally on full?scale and model?scale tunnels. In wind tunnels without acoustical treatment the driving fan and the boundary layer suction fan were found to be the dominant noise sources. The fan noise in the test section scales with the 6th power of the airspeed. Using this scaling one obtains a number the acoustical merit rating which permits one to compare the acoustical quality of different wind tunnels. Experimental results obtained in full scale as well as in scale models of closed circuit tunnels will be presented to illustrate the impulse response and spatial distribution of the sound pressure. Also the special instrumentation required for obtaining valid results will be discussed.

I. L. Vér

1973-01-01T23:59:59.000Z

329

Bowel-sound pattern analysis using wavelets and neural networks with application to long-term, unsupervised, gastrointestinal motility monitoring  

Science Journals Connector (OSTI)

This work focuses on the implementation of an autonomous system appropriate for long-term, unsupervised monitoring of bowel sounds, captured by means of abdominal surface vibrations. The autonomous intestinal motility analysis system (AIMAS) promises ... Keywords: Abdominal vibration, Bioacoustics, Bowel sounds, Multi-layer perceptron, Neural network, Pattern classification, Pattern recognition, Wavelet

C. Dimoulas; G. Kalliris; G. Papanikolaou; V. Petridis; A. Kalampakas

2008-01-01T23:59:59.000Z

330

Acoustic observations of suspended sediments in the Changjiang Estuary  

Science Journals Connector (OSTI)

An acoustic backscatter instrument of dual frequencies (0.5 and 1.5 MHz) was developed for suspended sediment measurements and for sediment transport studies. The instrument measures the vertical concentration profiles of suspended sediments with a temporal resolution of 1 s and a spatial (depth) resolution of 10 cm for 0.5 MHz or 2 cm for 1.5 MHz. The data of backscattered acoustic energy are sampled at a rate of 75 kHz for a 450?s burst each time so each burst comprises 450 vertical profiles. Coincidentally six calibration points for the water column are taken through water sampling. Further data processing for each burst such as compensation for sound transmission losses in situ calibration of acoustic scattering intensity to real concentration of suspended sediments and ensemble averaging over adjustable time–depth sizes permits three?dimensional concentration profiles to be derived. To increase the accuracy of concentration measurement a multisegment procedure to form an appropriate compensation and calibration curve is applied. Through observations at the Changjiang Estuary four patterns of vertical suspension profiles are identified at flood and ebb tides. In addition lutoclines and interfacial waves within the near?bed high concentration suspensions are revealed.

Shuying Zhang

1998-01-01T23:59:59.000Z

331

High?frequency acoustic propagation measurements during solitary wave events on the eastern continental shelf edge  

Science Journals Connector (OSTI)

High?frequency environmental acoustics studies were conducted during July 1993 on the continental shelf edge east of New Jersey. Internal solitons previously observed in this region near the shelf/slope front propagate in packets usually in the summer seasonal thermocline and have been associated with anomalous low frequency sound propagation. Acoustic pings were collected using a towed sled instrumented with sonar arrays. Synoptic measurements to characterize the solitons including sound velocity profiles sampled every 10 min over a tidal cycle and moored data including current temperature and conductivity. Acoustic measurements were taken during sled tows parallel to the bottom bathymetry normal to the propagation direction over a region determined from bottom cores to be nearly homogeneous fine sand. Measurements were taken using the sled as a source for backscattermeasurements and also using moored acoustic sources and the sled based transducers as receivers. The observed solitons had amplitudes of approximately 10 m and periods of several minutes. The backscatter variability during soliton events was observed to approximately 10–20 dB and will be compared to modeled predictions based on environmental data.

Edward R. Levine; Richard R. Shell; Michael R. Medeiros

1994-01-01T23:59:59.000Z

332

Puget Sound area electric reliability plan  

SciTech Connect

Various conservation, load management, and fuel switching programs were considered as ways to reduce or shift system peak load. These programs operate at the end-use level, such as residential water heat. Figure D-1a shows what electricity consumption for water heat looks like on normal and extreme peak days. Load management programs, such as water heat control, are designed to reduce electricity consumption at the time of system peak. On the coldest day in average winter, system load peaks near 8:00 a.m. In a winter with extremely cold weather, electricity consumption increases fr all hours, and the system peak shifts to later in the morning. System load shapes in the Puget Sound area are shown in Figure D-1b for a normal winter peak day (February 2, 1988) and extreme peak day (February 3, 1989). Peak savings from any program are calculated to be the reduction in loads on the entire system at the hour of system peak. Peak savings for all programs are measured at 8:00 a.m. on a normal peak day and 9:00 a.m. on an extreme peak day. On extremely cold day, some water heat load shifts to much later in the morning, with less load available for shedding at the time of system peak. Models of hourly end-use consumption were constructed to simulate the impact of conservation, land management, and fuel switching programs on electricity consumption. Javelin, a time-series simulating package for personal computers, was chosen for the hourly analysis. Both a base case and a program case were simulated. 15 figs., 7 tabs.

Not Available

1991-09-01T23:59:59.000Z

333

Written vs. Sounding Pitch Donald Byrd  

E-Print Network (OSTI)

1 Written vs. Sounding Pitch Donald Byrd School of Informatics and School of Music Indiana that converting written pitch to sounding pitch in conventional Western music notation is simply a matter of transposition and always straightforward. In fact, there are many situations in which converting written pitch

Indiana University

334

Audio Morphing for Percussive Hybrid Sound Generation  

E-Print Network (OSTI)

Audio Morphing for Percussive Hybrid Sound Generation Andrea Primavera1, Francesco Piazza1 should be addressed to Andrea Primavera (a.primavera@univpm.it) ABSTRACT The aim of audio morphing to obtain more realistic and perceptually relevant sounds. In this paper we present an automatic audio

Reiss, Josh

335

Transmission of acoustic?gravity waves through air?water interface.  

Science Journals Connector (OSTI)

It was demonstrated recently that air?water interface which is usually an almost perfect reflector of acoustic waves becomes anomalously transparent and the power flux in the wave transmitted into air increases dramatically when a compact sound source in water approaches the interface within a fraction of wavelength [O. A. Godin Phys. Rev. Lett. 97 164301 (2006)]. Powerful underwater explosions and certain natural sources such as underwater landslides generate very low?frequency waves in water and air for which both fluid buoyancy and compressibility simultaneously serve as restoring forces. In this paper analysis of sound transmission through air?water interface is extended to acoustic?gravity waves (AGWs). It is found that as for sound the interface becomes anomalously transparent for sufficiently shallow compact sources of AGWs. Depending on the source type the increase in wave power flux into air due to diffraction effects can reach several orders of magnitude. Physical mechanisms responsible for the anomalous transparency are discussed. Excitation of an interfacewave by an underwater source is shown to be an important channel of AGW transmission into atmosphere which has no counterpart in the case of sound.

Iosif M. Fuks; Oleg A. Godin

2010-01-01T23:59:59.000Z

336

Identifying acoustical coupling by measurements and prediction-models for St. Peter’s Basilica in Rome  

Science Journals Connector (OSTI)

St. Peter’s Basilica is one of the largest buildings in the world having a huge volume resulting from the addition of different parts. Consequently sound propagation cannot be interpreted using a conventional approach and requires experimental measures to be compared with statistical-acoustics and geometrical predictions in order to explain the interplay between shape materials and sound waves better. In previous research one of the most evident effects the surprisingly low reverberation time was believed to result from acoustical coupling phenomena. Taking advantage of more refined measuring techniques available today an acoustic survey was carried out and the results were analyzed using different methods including Bayesian parameter estimation of multiple slope decays and directional energy plots which showed that coupling effects actually take place even though measured reverberation times were longer than those given in previous studies. In addition experimental results were compared with geometrical- and statistical-acoustic models of the basilica which showed that careful selection of input data and in statistical models the inclusion of phenomena such as direct sound radiation and non-diffuse energy transfer allow obtaining accurate results. Finally both models demonstrated that reduced reverberation depends more on increased absorption of decorated surfaces than on coupling effects.

Francesco Martellotta

2009-01-01T23:59:59.000Z

337

Wireless technology and library acoustics  

Science Journals Connector (OSTI)

The modern library cannot function without modern technology. Printers copiers wireless computers and espresso machines all contribute to the soundscape of the typical municipal library (and many academic libraries too). While some of these noise sources are stationary and can be isolated acoustically wireless computing has transformed the acoustic experience for the typical library patron. Study carrels and desks used to define the boundaries of study and work areas in libraries and architects could design spaces accordingly. With wireless technology every space is a study space. This paper will discuss the implications of wireless technology on library acoustics. Measurement results at a variety of case study libraries will be presented.

2006-01-01T23:59:59.000Z

338

Stellar acoustic radii, mean densities and ages from seismic inversion techniques  

E-Print Network (OSTI)

Context. Determining stellar characteristics such as the radius, the mass or the age is crucial when studying stellar evolution, exoplanetary systems or characterising stellar populations in the Galaxy. Asteroseismology is the golden path to accurately obtain these characteristics. In this context, a key question is how to make these methods less model-dependant. Aims. Building on the work of Reese et al. (2012), we wish to extend the SOLA inversion technique to new stellar global characteristics in addition to the mean density. The goal is to provide a general framework in which to estimate these characteristics as accurately as possible in low mass main sequence stars. Methods. First, we describe our framework and discuss the reliability of the inversion technique and the possible sources of error.We then apply this methodology to the acoustic radius, an age indicator based on the sound speed derivative and the mean density and compare it to estimates based on the average large and small frequency separatio...

Buldgen, Gaël; Dupret, Marc-Antoine; Samadi, Réza

2014-01-01T23:59:59.000Z

339

Studies of TTF RF Photocathode Gun using acoustic sensors J. Nelson and M. Ross  

E-Print Network (OSTI)

1 Studies of TTF RF Photocathode Gun using acoustic sensors J. Nelson and M. Ross SLAC November 27 RF high voltage breakdown locations in the photocathode gun system. It is not known if the acoustic gun [4] to locate its breakdown events during operation with a pulse length of 300µs and a pulse

340

Acoustic Correlates of Information Structure.  

E-Print Network (OSTI)

This paper reports three studies aimed at addressing three questions about the acoustic correlates of information structure in English: (1) do speakers mark information structure prosodically, and, to the extent they do; ...

Breen, Mara

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Parallel and real-time implementation of an acoustic echo canceller using oversampled wavelet frame algorithms  

E-Print Network (OSTI)

This thesis describes a novel echo cancellation system that eliminates nonstationary echoes with long acoustic delays in real-time. By combining subband adaptive filtering and active system identification based on fast wavelet transform...

Tam, Pak-Yin

2012-06-07T23:59:59.000Z

342

HEARING AND LATERAL LINE | Effects of Human-Generated Sound on Fish  

Science Journals Connector (OSTI)

Abstract Fish depend on sound to communicate with one another, detect prey and predators, navigate from one place to another, avoid hazards, and analyze the world around them. The generation of noise in the ocean, lakes, and rivers by shipping, construction activities, seismic surveys, and sonar systems may affect fish adversely. In recent years, there has been a significant increase in the levels and incidence of human-generated underwater sound, and much of the technology contributing to ocean noise is new. Efforts are now underway to regulate activities that generate underwater sound with the aim of reducing noise levels and minimizing effects upon fish and other aquatic animals.

A.D. Hawkins

2011-01-01T23:59:59.000Z

343

Puget Sound Clean Cities Petroleum Reduction Project | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

tiarravt042meyn2010p.pdf More Documents & Publications Puget Sound Clean Cities Petroleum Reduction Project Puget Sound Clean Cities Petroleum Reduction Project North Central...

344

Puget Sound Clean Cities Petroleum Reduction Project | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Puget Sound Clean Cities Petroleum Reduction Project Puget Sound Clean Cities Petroleum Reduction Project 2012 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program...

345

Puget Sound Clean Cities Petroleum Reduction Project | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Puget Sound Clean Cities Petroleum Reduction Project Puget Sound Clean Cities Petroleum Reduction Project 2011 DOE Hydrogen and Fuel Cells Program, and Vehicle Technologies Program...

346

EIS-0470: Cape Wind Energy Project, Nantucket Sound, Offshore...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

0: Cape Wind Energy Project, Nantucket Sound, Offshore of Massachusetts EIS-0470: Cape Wind Energy Project, Nantucket Sound, Offshore of Massachusetts June 25, 2014 EIS-0470: Cape...

347

Category:Electromagnetic Sounding Techniques | Open Energy Information  

Open Energy Info (EERE)

Electromagnetic Sounding Techniques Electromagnetic Sounding Techniques Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermalpower.jpg Looking for the Electromagnetic Sounding Techniques page? For detailed information on Electromagnetic Sounding Techniques, click here. Category:Electromagnetic Sounding Techniques Add.png Add a new Electromagnetic Sounding Techniques Technique Subcategories This category has only the following subcategory. M [×] Magnetotelluric Techniques‎ 1 pages Pages in category "Electromagnetic Sounding Techniques" The following 2 pages are in this category, out of 2 total. M Magnetotelluric Techniques T Time-Domain Electromagnetics Retrieved from "http://en.openei.org/w/index.php?title=Category:Electromagnetic_Sounding_Techniques&oldid=689837"

348

Underwater Sound Generation Using Carbon Nanotube Projectors  

Science Journals Connector (OSTI)

The application of solid-state fabricated carbon nanotube sheets as thermoacoustic projectors is extended from air to underwater applications, thereby providing surprising results. While the acoustic generation efficiency of a liquid immersed nanotube ...

Ali E. Aliev; Marcio D. Lima; Shaoli Fang; Ray H. Baughman

2010-05-27T23:59:59.000Z

349

Electromagnetic Sounding Techniques | Open Energy Information  

Open Energy Info (EERE)

Electromagnetic Sounding Techniques Electromagnetic Sounding Techniques Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Electromagnetic Sounding Techniques Details Activities (1) Areas (1) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Ground Electromagnetic Techniques Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water Thermal: Resistivity influenced by temperature

350

Vertical Electrical Sounding Configurations | Open Energy Information  

Open Energy Info (EERE)

Vertical Electrical Sounding Configurations Vertical Electrical Sounding Configurations Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Vertical Electrical Sounding Configurations Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Direct-Current Resistivity Survey Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water Thermal: Resistivity influenced by temperature

351

System and method to create three-dimensional images of non-linear acoustic properties in a region remote from a borehole  

DOE Patents (OSTI)

In some aspects of the disclosure, a method for creating three-dimensional images of non-linear properties and the compressional to shear velocity ratio in a region remote from a borehole using a conveyed logging tool is disclosed. In some aspects, the method includes arranging a first source in the borehole and generating a steered beam of elastic energy at a first frequency; arranging a second source in the borehole and generating a steerable beam of elastic energy at a second frequency, such that the steerable beam at the first frequency and the steerable beam at the second frequency intercept at a location away from the borehole; receiving at the borehole by a sensor a third elastic wave, created by a three wave mixing process, with a frequency equal to a difference between the first and second frequencies and a direction of propagation towards the borehole; determining a location of a three wave mixing region based on the arrangement of the first and second sources and on properties of the third wave signal; and creating three-dimensional images of the non-linear properties using data recorded by repeating the generating, receiving and determining at a plurality of azimuths, inclinations and longitudinal locations within the borehole. The method is additionally used to generate three dimensional images of the ratio of compressional to shear acoustic velocity of the same volume surrounding the borehole.

Vu, Cung; Nihei, Kurt T.; Schmitt, Denis P.; Skelt, Christopher; Johnson, Paul A.; Guyer, Robert; TenCate, James A.; Le Bas, Pierre-Yves

2013-01-01T23:59:59.000Z

352

Measuring the effects of acoustical environments on nurses in health?care facilities: A pilot study.  

Science Journals Connector (OSTI)

This paper summarizes the methods and results of a pilot ecological study conducted in four health?care facilities (acute?care community?care and long?term?care). The objective was to consolidate and test tools for exposure assessment and the investigation of study outcomes in particular stress. Area and personal monitoring was performed. Nurse noise exposures were monitored. Full?shift monitoring of sound levels was performed and conventional acoustical parameters derived; new acoustical descriptors including occurrence rate and peakiness were also determined. Two questionnaire scales were developed: a study questionnaire to assess perception of the acoustical environment and of work? and noise?related stresses and a daily diary to capture variations in the perceived stress and document aggressive events. The study questionnaire was found to measure disturbance impaired communication and mental fatigue. Biological markers of noise?related stress (salivary cortisol and heart?rate variability) were collected. Exposure measures were correlated with outcomes; while the results were often not statistically significant due to small sample sizes they identified interesting relationships and validated the measurement tools for future use. Long?term?care was identified as the most acoustically?critical environment both from a physical?acoustical perspective and from the perspective of workers.

Hind Sbihi; Murray Hodgson; George Astrakianakis; Pamela Ratner

2011-01-01T23:59:59.000Z

353

Platform-Independent Implementation of 3D-Sound Computer Interface Icons for Subjects with Visual Impairments  

E-Print Network (OSTI)

Platform-Independent Implementation of 3D-Sound Computer Interface Icons for Subjects with Visual to the icons of a computer interface in order to assist visually impaired individuals during icon location and selection. In this enhanced system, icons have 3D sound properties, in addition to their graphical

Barreto, Armando

354

ARM - Evaluation Product - Merged Sounding VAP  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsMerged Sounding VAP ProductsMerged Sounding VAP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : Merged Sounding VAP Site(s) FKB GRW HFE NIM NSA PYE SGP TWP General Description This value-added product (VAP) uses a combination of observations from radiosonde soundings, the microwave radiometer, surface meteorological instruments, and ECMWF model output with a sophisticated scaling/interpolation/smoothing scheme in order to define profiles of the atmospheric thermodynamic state. These profiles are calculated at one-minute time resolution and 266 vertical levels which vary such that greater detail (20 meters) is captured near the surface with the resolution becoming coarser (200 meters) as the maximum altitude - 20 km above mean

355

Acoustic hemostasis: Underlying mechanisms  

Science Journals Connector (OSTI)

Cessation of hemorrhage using extrinsic interventional methods is possible with delivery of energy to bleeding tissues i.e. cauterization. High intensity focused ultrasound (HIFU) is one such method with significant advantages of delivering high levels of energy to well?defined regions of deep?seated tissues even during profuse bleeding. The physical mechanisms involved in this process include thermal and mechanical effects of HIFU leading to various biological effects. Our results using HIFU devices of 1–5 MHz and focal derated intensities of 1 000–10 000 W/cm2 in solid organs such as liver spleen and kidneys and major and minor blood vessels show that temperature of targeted tissues reaches 70–100°C within seconds with formation of microbubbles approximately 5??200 ? in size and concentration of 100 bubbles/mm3. It appears that boiling of interstitial fluids and blood and acoustic cavitation are both involved. The biological effects include coagulative necrosis mechanical disruption of tissue structure potentially leading to release of tissue factors enhancing the coagulation coagulum and thrombus formation at a wound site tissue fusion via collagen and elastin remodeling and fibrin plug formation with minimal damage of the surrounding tissues. These mechanisms appear to provide an effective and safe method of hemorrhage control. [Work supported by NIH DoD NSBRI.

Shahram Vaezy; Lawrence Crum; Steve Carter; Grant O’Keefe; Vesna Zderic; Roy Martin; Riyad Karmy?Jones

2007-01-01T23:59:59.000Z

356

Anthropogenic sounds ? Potential effects on fish  

Science Journals Connector (OSTI)

There is concern that human?generated sounds may have deleterious effects on fish. This paper will review some of what is currently known about these effects and consider the questions that have to be answered before developing models to enable "prediction" of sound effects on particular fish species. A major restriction is that there are few peer?reviewed data on effects of anthropogenic sources on fish. Extrapolation from these results is further confounded since experiments differ in many ways each of which may alter the resultant impact on fish. For example studies vary in sounds types tested (e.g. pile driving vs. ship noise) signal parameters (intensity number of repetitions) species used fish age etc. Moreover a singularly important issue is that while many of the issues and impact mechanisms are potentially amenable to experimental lab study the ultimate questions regarding the effects of sound on fish behavior need to field based and require long?term observations where behaviour of wild fish is not constrained. Only by observing fish in the wild will we ultimately understand if and how anthropogenic sounds impact fish both during exposure and more importantly for extended periods after the termination of the sound.

Arthur Popper; Svein Lo/kkeborg; Robert McCauley

2008-01-01T23:59:59.000Z

357

christy-99.PDF  

NLE Websites -- All DOE Office Websites (Extended Search)

profilers (RWP) outfitted with radio acoustic sounding systems (RASS), which return vertical profiles of virtual temperature. These instruments transmit an acoustic signal...

358

First-Order Transition from Superfluid to Bose-Metal State in Systems with Resonant Pairing  

Science Journals Connector (OSTI)

Systems showing resonant superfluidity, driven by an exchange coupling of strength g between uncorrelated pairs of itinerant fermions and tightly bound ones, undergo a first-order phase transition as g increases beyond some critical value gc. The superfluid phase for g?gc is characterized by a gap in the fermionic single-particle spectrum and an acoustic sound-wave-like collective mode of the bosonic resonating fermion pairs inside this gap. For g>gc this state gives way to a phase-uncorrelated bosonic liquid with a q2 spectrum.

T. Stauber and J. Ranninger

2007-07-26T23:59:59.000Z

359

Acoustic quality factor and energy losses in cylindrical pipes  

Science Journals Connector (OSTI)

The quality factor Q of a damped oscillator equals 2? times the ratio of stored energy to the energy dissipated per cycle. This makes Q a sensitive probe of energy losses. Using modest equipment we measured the acoustical Q for a set of cylindrical pipes having the same resonant frequency but different diameters D. The graph of Q vs D could be well fitted with two parameters one of which corresponds to energy loss via radiation from the ends of the pipe and the other to thermal and viscous losses very close to the pipe wall. The wall loss parameter was quite constant no matter where the pipes were located but the radiative loss parameter varied significantly with location inside a room suggesting that room reflections affected the sound radiated from the pipe. This study offers valuable insights at no great expense and could be the basis of an upper-division undergraduatelaboratory experiment.

Michael J. Moloney; Daniel L. Hatten

2001-01-01T23:59:59.000Z

360

In-process acoustic emission monitoring of dissimilar metal welding: Final report  

SciTech Connect

A system to provide real-time, in-process acoustic emission monitoring to detect and locate flaws in bimetallic welds has been demonstrated. This system could provide reliable inspection of critical welds in cases where conventional NDE would be costly or impossible to apply. Tests were completed on four sample welds to determine the sensitivity of the system. Artificial flaws were introduced into two test samples and the acoustic emission results were verified by radiography and visual inspection techniques.

Not Available

1989-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Acoustic imaging in a water filled metallic pipe  

SciTech Connect

A method is described for the imaging of the interior of a water filled metallic pipe using acoustical techniques. The apparatus consists of an array of 20 acoustic transducers mounted circumferentially around the pipe. Each transducer is pulsed in sequence, and the echos resulting from bubbles in the interior are digitized and processed by a computer to generate an image. The electronic control and digitizing system and the software processing of the echo signals are described. The performance of the apparatus is illustrated by the imaging of simulated bubbles consisting of thin walled glass spheres suspended in the pipe.

Kolbe, W.F.; Turko, B.T.; Leskovar, B.

1984-04-01T23:59:59.000Z

362

Lattice Boltzmann method for adiabatic acoustics  

Science Journals Connector (OSTI)

...Sauro Succi and Stefano Ubertini Lattice Boltzmann method for adiabatic acoustics...Burlington, MA 01803, USA The lattice Boltzmann method (LBM) has been proved...recovery of the full NS equations. lattice Boltzmann method|computational aero-acoustics...

2011-01-01T23:59:59.000Z

363

Acoustic data transmission through a drill string  

DOE Patents (OSTI)

Acoustical signals are transmitted through a drill string by canceling upward moving acoustical noise and by preconditioning the data in recognition of the comb filter impedance characteristics of the drill string. 5 figs.

Drumheller, D.S.

1988-04-21T23:59:59.000Z

364

An Estimate of Biofilm Properties using an Acoustic Microscope  

SciTech Connect

Noninvasive measurements over a biofilm, a three-dimensional community of microorganisms immobilized at a substratum, were made using an acoustic microscope operating at frequencies up to 70 MHz. Spatial variation of surface heterogeneity, thickness, interior structure, and biomass of a living biofilm was estimated over a 2.5-mm by 2.5-mm region. Ultrasound based estimates of thickness were corroborated using optical microscopy and the nominal biofilm thickness was 100 microns. Experimental data showed that the acoustic microscope combined with signal processing was capable of imaging and making quantitative estimates of the spatial distribution of biomass within the biofilm. The revealed surface topology and interior structure of the biofilm provide data for use in advanced biofilm mass transport models. The experimental acoustic and optical systems, methods to estimate of biofilm properties and potential applications for the resulting data are discussed.

Good, Morris S.; Wend, Christopher F.; Bond, Leonard J.; Mclean, Jeffrey S.; Panetta, Paul D.; Ahmed, Salahuddin; Crawford, Susan L.; Daly, Don S.

2006-09-01T23:59:59.000Z

365

Acoustic radiation force in tissue-like solids due to modulated sound field  

E-Print Network (OSTI)

with the existing theory reveals a number of key features that are brought to light by the new formulation (Sarvazyan et al., 1998; Bercoff et al., 2004; Palmeri et al., 2005). On the medical forefront

Guzina, Bojan

366

The sound of Titan a role for acoustics in space exploration  

E-Print Network (OSTI)

's Venera missions to Venus). in early 2005 will undertake a 2.5 hour parachute descent However, were is generated the features associated with the terrestrial water cycle: seas, by environmental processes breakdown of ammonia (NH3) deposited from comets, producing N2 and hydrogen (which is sufficiently light

Sóbester, András

367

Zero sound modes of dilute Fermi gases with arbitrary spin  

Science Journals Connector (OSTI)

Motivated by the recent success of optical trapping of alkali-metal bosons, we have studied the zero sound modes of dilute Fermi gases with arbitrary spin-f, which are spin-S excitations (0<~S<~2f). The dispersion of the mode (S) depends on a single Landau parameter F(S), which is related to the scattering lengths of the system through a simple formula. Measurement of (even a subset of) these modes in finite magnetic fields will enable one to determine all the interaction parameters of the system.

S.-K. Yip and Tin-Lun Ho

1999-06-01T23:59:59.000Z

368

A survey of the acoustical quality of seventeen libraries at Princeton University  

Science Journals Connector (OSTI)

The purpose of this study was to identify objective acoustic measures that correlate with the subjective responses of students and administrators to libraries at Princeton University. The motivation for this study was to determine what is necessary in order to provide a comfortable acoustic environment for users of a new science library to be built on campus. On 31 March 2003 Acentech Incorporated evaluated 17 library spaces and interviewed a number of students and librarians at Princeton. Based on the results of the survey the author proposes that a comfortable acoustic environment in a library is an environment that provides freedom from distraction; in other words casual conversation and other noises in the library will not distract users reading or studying in the library. In order to provide such an environment a library must have (1) appropriate levels of background sound (2) a physical barrier between noise?producing and noise?sensitive sections and (3) sufficient sound absorbing material in the space. Measured quantitative metrics support these conclusions.

2003-01-01T23:59:59.000Z

369

Acoustic measurements for the combustion diagnosis of diesel engines fuelled with biodiesels  

Science Journals Connector (OSTI)

In this paper, an experimental investigation was carried out on the combustion process of a compression ignition (CI) engine running with biodiesel blends under steady state operating conditions. The effects of biodiesel on the combustion process and engine dynamics were analysed for non-intrusive combustion diagnosis based on a four-cylinder, four-stroke, direct injection and turbocharged diesel engine. The signals of vibration, acoustic and in-cylinder pressure were measured simultaneously to find their inter-connection for diagnostic feature extraction. It was found that the sound energy level increases with the increase of engine load and speed, and the sound characteristics are closely correlated with the variation of in-cylinder pressure and combustion process. The continuous wavelet transform (CWT) was employed to analyse the non-stationary nature of engine noise in a higher frequency range. Before the wavelet analysis, time synchronous average (TSA) was used to enhance the signal-to-noise ratio (SNR) of the acoustic signal by suppressing the components which are asynchronous. Based on the root mean square (RMS) values of CWT coefficients, the effects of biodiesel fractions and operating conditions (speed and load) on combustion process and engine dynamics were investigated. The result leads to the potential of airborne acoustic measurements and analysis for engine condition monitoring and fuel quality evaluation.

Dong Zhen; Tie Wang; Fengshou Gu; Belachew Tesfa; Andrew Ball

2013-01-01T23:59:59.000Z

370

Acoustic Barcodes: Passive, Durable and Inexpensive Notched Identification Tags  

E-Print Network (OSTI)

barcodes with their (un-instrumented) fin- gers. It is also possible to use rings, pens, dry erase markers: the Cricket System [15] uses coded ultrasound pulses to locate and identify users in an instrumented room. Hambone [3] is a wrist-worn acoustic sensor that detects movement of the arms via bone conduction,

Olsen Jr., Dan R.

371

Structural Health Monitoring of Smart Composite Material by Acoustic Emission  

E-Print Network (OSTI)

Structural Health Monitoring of Smart Composite Material by Acoustic Emission S. Masmoudia , A. El composite structures gives the opportunity to develop smart materials for health monitoring systems and to follow the evolution of these various mechanisms for both types of materials (with and without sensors

Paris-Sud XI, Université de

372

Acoustic Logs | Open Energy Information  

Open Energy Info (EERE)

Acoustic Logs Acoustic Logs Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Acoustic Logs Details Activities (7) Areas (6) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: determine porosity of layers Stratigraphic/Structural: map discontinuities to determine their orientation. Hydrological: Thermal: Cost Information Low-End Estimate (USD): 1.00100 centUSD 1.0e-3 kUSD 1.0e-6 MUSD 1.0e-9 TUSD / foot Median Estimate (USD): 4.62462 centUSD 0.00462 kUSD 4.62e-6 MUSD 4.62e-9 TUSD / foot High-End Estimate (USD): 16.001,600 centUSD 0.016 kUSD 1.6e-5 MUSD 1.6e-8 TUSD / foot

373

Schlumberger soundings, audio-magnetotelluric soundings and telluric...  

Open Energy Info (EERE)

Kitchen-Coso Hot Springs area in the Coso rhyolite dome field and the large arcuate fracture system previously postulated to represent a stage of incipient caldera formation were...

374

Direct Amplification of Sound By Light  

E-Print Network (OSTI)

The principles of parametric interactions have been widely used in physics, including low noise microwave amplifiers, optical parametric oscillators (OPOs) and optical spring interactions with mechanical resonators. In the case of opto-mechanical interactions a mechanical mode modulates the length of an optical cavity, thereby changing the resonance condition of the optical mode. In recent experiments this interaction has been used to "cool" thermally excited mechanical modes of small acoustic resonators through the associated time dependent radiation pressure forces acting on the resonator. Such techniques are examples of two-mode parametric interactions in which the optical mode linewidth is sufficiently broad that the mechanical frequency occurs within the linewidth of a single mode. Here we present the first observation of three-mode opto-acoustic parametric interactions. In this case energy in an optical cavity mode is scattered into another optical cavity mode by its interaction with an acoustic mode in...

Zhao, C; Fan, Y; Miao, S Grass H; Blair, D G; Hosken, D; Brooks, A; Veitch, P J; Munch, J; Slagmolen, B J J; McClelland, D E

2007-01-01T23:59:59.000Z

375

Dark Energy Constraints from Baryon Acoustic Oscillations  

Science Journals Connector (OSTI)

Baryon acoustic oscillations (BAOs) in the galaxy power spectrum allow us to extract the scale of the comoving sound horizon at recombination, a cosmological standard ruler accurately determined by the cosmic microwave background anisotropy data. We examine various issues important in the use of BAOs to probe dark energy. We find that if we assume a flat universe and priors on ?m, ?mh2, and ?bh2 as expected from the Planck mission, the constraints on dark energy parameters (w0, w') scale much less steeply with survey area than (area)-1/2 for a given redshift range. The constraints on the dark energy density ?X(z), however, do scale roughly with (area)-1/2 due to the strong correlation between H(z) and ?m (which reduces the effect of priors on ?m). Dark energy constraints from BAOs are very sensitive to the assumed linear scale of matter clustering and the redshift accuracy of the survey. For a BAO survey with 0.5 ? z ? 2, ? (R) = 0.4 [corresponding to kmax (z = 0) = 0.086 h Mpc-1], and ?z/ (1 + z) = 0.001, we find = (0.115,0.183) and (0.069, 0.104) for survey areas of 1000 and 10,000 deg2, respectively. We find that it is critical to minimize the bias in the scale estimates in order to derive reliable dark energy constraints. For a 1000 (10,000) deg2 BAO survey, a 1 ? bias in ln H (z) leads to a 2 ? (3 ?) bias in w'. The bias in w' due to the same scale bias from ln DA (z) is slightly smaller and opposite in sign. The results from this paper will be useful in assessing different proposed BAO surveys and guiding the design of optimal dark energy detection strategies.

Yun Wang

2006-01-01T23:59:59.000Z

376

Geographically distributed acoustical monitoring of migrating birds  

Science Journals Connector (OSTI)

A geographically distributed system of largely automated acoustical monitoring stations was developed to monitor the migration of small passerine birds. The targeted species wood warblers and sparrows migrate at night and produce short (about 120 ms at the longest) high?pitched (between roughly 6 and 10 kHz) calls as they fly often audible from the ground. The monitoring system consisted of ten stations located in New Jersey Maryland Pennsylvania and New York and a central data repository located at the Cornell Lab of Ornithology. Each station comprised an outdoor weatherproof microphone connected to a volunteer’s home computer. The computer automatically ran acoustic transient detection software each night that listened continuously to the microphone signal and extracted all transients matching certain criteria each to its own audio file. The detected transients were uploaded by the volunteer each morning via the Internet to the central repository for classification and archival. Results including spectrograms of all detected transients and bird call counts were displayed on a public web site updated daily. [Work supported by EPA.

2000-01-01T23:59:59.000Z

377

Physiological acoustics and health  

Science Journals Connector (OSTI)

This paper reviews work on the assessment of the damaging effect of noise on man’s auditory system the degree to which the auditory system interacts directly with the autonomic system of the body noise as the sole or contributory cause of general (nonauditory) physiological and psychological ill health in communities and the effect of noise on general health in industry.

Karl D. Kryter

1980-01-01T23:59:59.000Z

378

An acoustic and aerodynamic study of stops in tonal and non-tonal dialects of Korean  

E-Print Network (OSTI)

ABSTRACT This study investigates the acoustic and aerodynamic properties of well&ndashknown three&ndashway distinction of Korean voiceless stops in two dialects, which differ in their tonal systems: non&ndashtonal Seoul Korean (standard Korean...

Lee, Hyunjung

2010-03-29T23:59:59.000Z

379

Harvesting time-frequency-space diversity with coded modulation for underwater acoustic communications  

E-Print Network (OSTI)

The goal of this thesis is to design a low-complexity, high data-rate acoustic communications system with robust performance under various channel conditions. The need for robust performance emerges because underwater ...

Pelekanakis, Konstantinos

2009-01-01T23:59:59.000Z

380

E-Print Network 3.0 - acoustic monitoring Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

System Designers... @ualg.pt 12;Acoustic Tomography: a tool for understanding the ocean S.M. Jesus (sjesus@ualg.pt) Si Source: Jesus, Srgio M. - Departamento de...

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Acoustical characteristics of restorative space on a university campus  

Science Journals Connector (OSTI)

This paper explores the nature sound environment and value of restorative space on University campuses in the United Kingdom that is separated from standard teaching venues. Questionnaire surveys were undertaken in the Atrium and Student Central at the University of Bradford and in the Library at Loughborough University to explore expectations and perceptions of restorative quality preferences values and use on non-teaching space. These spaces are used routinely by the students for social relaxation individual and group studies. Contemporaneous continuous measures of noise were undertaken at the survey locations. Noise levels in a social space on campus can be as high as 85 dB which affects the restorative quality of the space. The results of these surveys enabled us to explore the link between the acoustical characteristics of a space and its restorative quality and to identify key sounds which contribute to the value of a restorative space. The value of such spaces is reflected in the willingness to pay for quieter and greener spaces.

Kirill V. Horoshenkov

2013-01-01T23:59:59.000Z

382

Puget Sound Energy Inc | Open Energy Information  

Open Energy Info (EERE)

Puget Sound Energy Inc Puget Sound Energy Inc Jump to: navigation, search Name Puget Sound Energy Inc Place Washington Utility Id 15500 Utility Location Yes Ownership I NERC Location WECC NERC WECC Yes Operates Generating Plant Yes Activity Generation Yes Activity Transmission Yes Activity Buying Transmission Yes Activity Distribution Yes Activity Retail Marketing Yes Alt Fuel Vehicle Yes Alt Fuel Vehicle2 Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] Energy Information Administration Form 826[2] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png 24 (General Service One Phase) Commercial 24 (General Service Three Phase) Commercial

383

Keyboard Acoustic Emanations Scott Leishman  

E-Print Network (OSTI)

of this step is the matrix. After that, the Viterbi algorithm [11] is used to infer qi, i.e. the best sequenceKeyboard Acoustic Emanations Scott Leishman ML Tea Talk - May 3rd, 2006 1 (or why you shouldn

Roweis, Sam

384

Acoustic Energy and Stellar Models  

Science Journals Connector (OSTI)

... the thermodynamic limitations of the generation of acoustic energy in stars. Quite recently, M. Schwarzschild and R. S. Richardson suggested that the transfer of energy in stars may, ... a heat engine, and this consideration does not support the views expressed by Richardson and Schwarzschild in dealing with the stellar model of red giants. In this model they suggest ...

1949-08-20T23:59:59.000Z

385

E-Print Network 3.0 - acoustic oscillation signature Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

47 ACOUSTICAL EFFECTS OF INTERNAL TIDES ACOUSTICAL EFFECTS OF INTERNAL TIDES ON SHALLOW WATER Summary: ACOUSTICAL EFFECTS OF INTERNAL TIDES ACOUSTICAL EFFECTS OF INTERNAL TIDES...

386

SPECIES RECOGNITION IS DRIVING EVOLUTION OF THE ACOUSTIC MATING SYSTEM OF SHIELD BACK KATYDIDS (ORTHOPTERA: TETTIGONIIDAE: AGLAOTHORAX): BEHAVIORAL AND PHYLOGENETIC EVIDENCE  

E-Print Network (OSTI)

Sexual selection and species recognition are two processes that may drive evolution of mating systems and contribute to speciation. Evidence from nature is rare. I asked whether song evolution in shield-back katydids (Aglaothorax) from southern...

Cole, Jeffrey A.

2009-12-01T23:59:59.000Z

387

An on-line acoustic fluorocarbon coolant mixture analyzer for the ATLAS silicon tracker  

SciTech Connect

The ATLAS silicon tracker community foresees an upgrade from the present octafluoro-propane (C{sub 3}F{sub 8}) evaporative cooling fluid - to a composite fluid with a probable 10-20% admixture of hexafluoro-ethane (C{sub 2}F{sub 6}). Such a fluid will allow a lower evaporation temperature and will afford the tracker silicon substrates a better safety margin against leakage current-induced thermal runaway caused by cumulative radiation damage as the luminosity profile at the CERN Large Hadron Collider increases. Central to the use of this new fluid is a new custom-developed speed-of-sound instrument for continuous real-time measurement of the C{sub 3}F{sub 8}/C{sub 2}F{sub 6} mixture ratio and flow. An acoustic vapour mixture analyzer/flow meter with new custom electronics allowing ultrasonic frequency transmission through gas mixtures has been developed for this application. Synchronous with the emission of an ultrasound 'chirp' from an acoustic transmitter, a fast readout clock (40 MHz) is started. The clock is stopped on receipt of an above threshold sound pulse at the receiver. Sound is alternately transmitted parallel and anti-parallel with the vapour flow for volume flow measurement from transducers that can serve as acoustic transmitters or receivers. In the development version, continuous real-time measurement of C{sub 3}F{sub 8}/C{sub 2}F{sub 6} flow and calculation of the mixture ratio is performed within a graphical user interface developed in PVSS-II, the Supervisory, Control and Data Acquisition standard chosen for LHC and its experiments at CERN. The described instrument has numerous potential applications - including refrigerant leak detection, the analysis of hydrocarbons, vapour mixtures for semiconductor manufacture and anesthetic gas mixtures. (authors)

Bates, R. [Dept. of Physics and Astronomy, Univ. of Glasgow, G12 8QQ (United Kingdom); Battistin, M. [CERN, 1211 Geneva 23 (Switzerland); Berry, S.; Bitadze, A. [Dept. of Physics and Astronomy, Univ. of Glasgow, G12 8QQ (United Kingdom); Bonneau, P. [CERN, 1211 Geneva 23 (Switzerland); Bousson, N. [Centre de Physique des Particules de Marseille, 163 Avenue de Luminy, 13288 Marseille Cedex 09 (France); Boyd, G. [Dept. of Physics and Astronomy, Univ. of Oklahoma, Norman, OK 73019 (United States); Botelho-Direito, J.; DiGirolamo, B. [CERN, 1211 Geneva 23 (Switzerland); Doubek, M. [Czech Technical Univ., Technicka 4, 166 07 Prague 6 (Czech Republic); Egorov, K. [Physics Dept., Indiana Univ., Bloomington, IN 47405 (United States); Godlewski, J. [CERN, 1211 Geneva 23 (Switzerland); Hallewell, G. [Centre de Physique des Particules de Marseille, 163 Avenue de Luminy, 13288 Marseille Cedex 09 (France); Katunin, S. [B.P. Konstantinov Petersburg Nuclear Physics Inst. PNPI, 188300 St. Petersburg (Russian Federation); Mathieu, M.; McMahon, S. [Rutherford Appelton Laboratory - Science and Technology Facilities Council, Chilton, Didcot OX11 OQX (United Kingdom); Nagai, K. [Graduate School of Pure and Applied Sciences, Univ. of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan); Perez-Rodriguez, E. [CERN, 1211 Geneva 23 (Switzerland); Rozanov, A. [Centre de Physique des Particules de Marseille, 163 Avenue de Luminy, 13288 Marseille Cedex 09 (France); Vacek, V.; Vitek, M. [Czech Technical Univ., Technicka 4, 166 07 Prague 6 (Czech Republic)

2011-07-01T23:59:59.000Z

388

Category:Vertical Electrical Sounding Configurations | Open Energy  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Category Edit History Facebook icon Twitter icon » Category:Vertical Electrical Sounding Configurations Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermalpower.jpg Looking for the Vertical Electrical Sounding Configurations page? For detailed information on Vertical Electrical Sounding Configurations as exploration techniques, click here. Category:Vertical Electrical Sounding Configurations Add.png Add a new Vertical Electrical Sounding Configurations Technique Pages in category "Vertical Electrical Sounding Configurations" The following 2 pages are in this category, out of 2 total.

389

Design and implementation of a marine animal alert system to support Marine Renewable Energy  

SciTech Connect

Power extracted from fast moving tidal currents has been identified as a potential commercial-scale source of renewable energy. Device developers and utilities are pursuing deployment of prototype tidal turbines to assess technology viability, site feasibility, and environmental interactions. Deployment of prototype turbines requires permits from a range of regulatory authorities. Ensuring the safety of marine animals, particularly those under protection of the Endangered Species Act of 1973 (ESA) and the Marine Mammal Protection Act of 1972 has emerged as a key regulatory challenge for initial MHK deployments. The greatest perceived risk to marine animals is from strike by the rotating blades of tidal turbines. Development of the marine mammal alert system (MAAS) was undertaken to support monitoring and mitigation requirements for tidal turbine deployments. The prototype system development focused on Southern Resident killer whales (SRKW), an endangered population of killer whales that frequents Puget Sound and is intermittently present in the part of the sound where deployment of prototype tidal turbines is being considered. Passive acoustics were selected as the primary means because of the vocal nature of these animals. The MAAS passive acoustic system consists of two-stage process involving the use of an energy detector and a spectrogram-based classifier to distinguish between SKRW’s calls and noise. A prototype consisting of two 2D symmetrical star arrays separated by 20 m center to center was built and evaluated in the waters of Sequim Bay using whale call playback.

Deng, Zhiqun; Carlson, Thomas J.; Fu, Tao; Ren, Huiying; Martinez, Jayson J.; Myers, Joshua R.; Matzner, Shari; Choi, Eric Y.; Copping, Andrea E.

2013-08-08T23:59:59.000Z

390

Puget Sound Career & Job Resources  

E-Print Network (OSTI)

Resources - Nonprofit & Government www2.ci.seattle.wa.us/CrisisClinic/ King County Veterans Program (206) 296-7656 www.vetsedge.org/king_county_veterans_program.htm Multi-Service Center, Federal Way (253) 838.lib.washington.edu/research/ click on Jobs and Careers King County Library System (425) 462-9600 www.kcls.org search keywords: Career

Kaminsky, Werner

391

Acoustics: Subtleties of the sonic  

Science Journals Connector (OSTI)

... rise of recording and playback technologies has left many thinking of sound (from music and audio books to rainforest-relaxation mixes) as best experienced in private through noise-cancelling headphones. ... Motor–Matter Bench (2013), for example, is rump-centric: a New York City subway bench has been wired up as a large speaker, with the heavy wooden seats ...

Douglas Repetto

2013-08-28T23:59:59.000Z

392

Sound from ultrasound : the parametric array as an audible sound source  

E-Print Network (OSTI)

A parametric array exploits the nonlinearity of the propagation medium to emit or detect acoustic waves in a spatially versatile manner, permitting concise, narrow directivity patterns otherwise possible only with physically ...

Pompei, F. Joseph (Frank Joseph), 1973-

2002-01-01T23:59:59.000Z

393

MHD wave refraction and the acoustic halo effect around solar active regions - a 3D study  

E-Print Network (OSTI)

An enhancement in high-frequency acoustic power is commonly observed in the solar photosphere and chromosphere surrounding magnetic active regions. We perform 3D linear forward wave modelling with a simple wavelet pulse acoustic source to ascertain whether the formation of the acoustic halo is caused by MHD mode conversion through regions of moderate and inclined magnetic fields. This conversion type is most efficient when high frequency waves from below intersect magnetic field lines at a large angle. We find a strong relationship between halo formation and the equipartition surface at which the Alfv\\'en speed $a$ matches the sound speed $c$, lending support to the theory that photospheric and chromospheric halo enhancement is due to the creation and subsequent reflection of magnetically dominated fast waves from essentially acoustic waves as they cross $a=c$. In simulations where we have capped $a$ such that waves are not permitted to refract after reaching the $a=c$ height, halos are non-existent, which su...

Rijs, Carlos; Przybylski, Damien; Cally, Paul S

2015-01-01T23:59:59.000Z

394

Statistical energy analysis limits for acoustic radiation car: an alternative approach  

Science Journals Connector (OSTI)

Due to a new pass?by noise regulation Vehicle exterior noise will have to be reduced in the coming years. This may be achieved by optimizing underbody and underhood absorption and screening apertures. There is then a need for numerical techniques able to predict sound reduction related to acoustic absorption and transmission loss changes. Through a work supported by ADEME and headed by PSA energy?based predictive techniques such as Analytical Statistical Energy Analysis (ASEA) and discretized Energy Flow Analysis (DEFA) were tested against the actual physical problem to be solved through a series of benchmarks. Both theories are compared across several simple acoustic problems. It is concluded that both methods do not fit to the initial acoustic optimization requirement due to their intrinsic assumptions that restrict their applicative range. More fitted numerical techniques are now investigated: among new candidates the Virtual SEA (VSEA) technique that allows the creation of a numerical model of coupled acoustic cavities from the finite element global modes without the serious limitations of ASEA and a matrix approach based on Craigh?Bampton substructuration of the cavities.

Gérard Borello; Alex Borello; Julien Primus; Laurent Gagliardini

2008-01-01T23:59:59.000Z

395

Experimental observation of acoustic sub-harmonic diffraction by a grating  

SciTech Connect

A diffraction grating is a spatial filter causing sound waves or optical waves to reflect in directions determined by the frequency of the waves and the period of the grating. The classical grating equation is the governing principle that has successfully described the diffraction phenomena caused by gratings. However, in this work, we show experimental observation of the so-called sub-harmonic diffraction in acoustics that cannot be explained by the classical grating equation. Experiments indicate two physical phenomena causing the effect: internal scattering effects within the corrugation causing a phase shift and nonlinear acoustic effects generating new frequencies. This discovery expands our current understanding of the diffraction phenomenon, and it also makes it possible to better design spatial diffraction spectra, such as a rainbow effect in optics with a more complicated color spectrum than a traditional rainbow. The discovery reveals also a possibly new technique to study nonlinear acoustics by exploitation of the natural spatial filtering effect inherent to an acoustic diffraction grating.

Liu, Jingfei, E-mail: benjamin.jf.liu@gatech.edu; Declercq, Nico F., E-mail: declercqdepatin@gatech.edu [Laboratory for Ultrasonic Nondestructive Evaluation “LUNE,” Georgia Tech Lorraine, Georgia Tech-CNRS UMI2958, Georgia Institute of Technology, 2, rue Marconi, Metz 57070 (France)

2014-06-28T23:59:59.000Z

396

Acoustic sand detector for fluid flowstreams  

DOE Patents (OSTI)

The particle volume and particle mass production rate of particulate solids entrained in fluid flowstreams such as formation sand or fracture proppant entrained in oil and gas production flowstreams is determined by a system having a metal probe interposed in a flow conduit for transmitting acoustic emissions created by particles impacting the probe to a sensor and signal processing circuit which produces discrete signals related to the impact of each of the particles striking the probe. The volume or mass flow rate of particulates is determined from making an initial particle size distribution and particle energy distribution and comparing the initial energy distribution and/or the initial size distribution with values related to the impact energies of a predetermined number of recorded impacts. The comparison is also used to recalibrate the system to compensate for changes in flow velocity.

Beattie, Alan G. (Corrales, NM); Bohon, W. Mark (Frisco, TX)

1993-01-01T23:59:59.000Z

397

A Study on the acoustical properties of road surfaces of recycled CFB materials  

Science Journals Connector (OSTI)

Traffic noise and noise control are major concerns of transportation as noise and vibration will cause both psychological and physiological consequences. Great efforts have been made to use more sound absorbent road surfaces in order to reduce traffic noise. The raw materials under study are recycled byproducts from circulating fluidized bed boiler (CFB). The recycled CFB materials have been approved for use by the Environmental and Transportation Departments in various regions throughout the United States for road stabilization and base/surface installations. These (CFB) materials have shown good ecological civil and mechanical properties and are more environmentally friendly than asphalt and concrete. However the acoustical properties of the pavements are not known. Two types of measurements have been conducted. First the traffic noise was measured using the statistical pass-by method on various road surfaces and a comprehensive comparison was conducted. Second the sound absorption coefficients of the CFB materials were measured using impedance tubes.

Ha Ngo; Zhuang Li; Alan Davis

2012-01-01T23:59:59.000Z

398

Graduate studies in acoustics and noise control in the School of Mechanical Engineering at Purdue University  

Science Journals Connector (OSTI)

The acoustics community at Purdue University will be described with special emphasis on the graduate program in Mechanical Engineering (ME). Purdue is home to around 30 faculty who study various aspects of acoustics and related disciplines and so there are many classes to choose from as graduate students structure their plans of study to complement their research activities and to broaden their understanding of the various aspects of acoustics. In Mechanical Engineering the primary emphasis is on understanding noise generation noise propagation and the impact of noise on people as well as development of noise control strategies experimental techniques and noise and noise impact prediction tools. The ME acoustics research is conducted at the Ray W. Herrick Laboratories which houses several large acoustics chambers that are designed to facilitate testing of a wide array mechanical systems reflecting the Laboratories’ long history of industry-relevant research. Complementing the acoustics research Purdue has vibrations dynamics and electromechanical systems research programs and is home to a collaborative group of engineering and psychology professors who study human perception and its integration into engineering design. There are also very strong ties between ME acoustics faculty and faculty in Biomedical Engineering and Speech Language and Hearing Sciences.

2014-01-01T23:59:59.000Z

399

On the dynamics and acoustics of cloud cavitation on an oscillating hydrofoil  

SciTech Connect

Observations have been made of the growth and collapse of surface and cloud cavitation on a finite aspect ratio hydrofoil oscillating in pitch. The cavitation was recorded using both still and high-speed motion picture photography, and the variations with cavitation number and reduced frequency of oscillation were investigated. The noise generated by the cavity collapse was also measured and analyzed. The acoustic signals associated with individual cavity collapse events have been synchronized with the motion pictures, providing insights into the correspondence between the flow structures involved in the cavity collapse process and the sound generated by them.

McKenney, E.A.; Brennen, C.E. [California Inst. of Tech., Pasadena, CA (United States). Dept. of Mechanical Engineering

1994-12-31T23:59:59.000Z

400

Measurement of the acoustic characteristics of the concert hall at the Sydney Opera House  

Science Journals Connector (OSTI)

The Sydney Opera House Trust is considering making changes to its Concert Hall. Prior to any alteration the Acoustics group at the University of Sydney has sought to document the hall. The main measurements were made for 48 receiver locations and 6 source locations using omnidirectional measurement microphones B?format (Soundfield) microphones and dummy head microphones in every receiver position. The measurements included impulse responses anechoic music recordings and recordings of a calibrated sound power source. Results documented by previous practitioners and researchers are described and comparison is made with the recent results.

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Second Sound in NaF  

Science Journals Connector (OSTI)

Propagation of heat pulses in NaF has been studied to higher temperatures in a purer crystal than studied by McNelly et al. At the highest temperatures the second-sound velocity fails to level off at the theoretically predicted limiting value.

Howard E. Jackson; Charles T. Walker; Thomas F. McNelly

1970-07-06T23:59:59.000Z

402

Noise and the Sound Insulation of Buildings  

Science Journals Connector (OSTI)

...Noise and the Sound Insulation of Buildings F. Ingerslev It is claimed that noise...well-being. An outstanding task for the building industry in the 1980s is to ensure a proper noise climate in new buildings. The target must be to obtain a noise...

1972-01-01T23:59:59.000Z

403

Electromagnetic soundings over a geothermal reservoir in Dixie Valley, Nevada  

SciTech Connect

An electromagnetic (EM) sounding survey was performed over a region encompassing the Dixie Valley geothermal field with the purpose of mapping the subsurface resistivity in the geothermal field and its surroundings. The EM survey consisted of 19 frequency-domain depth soundings made with the EM-60 system using three separate horizontal-loop transmitters, and was designed to explore a narrow region adjacent to the Stillwater Range to a depth of 2 to 3 k. Most sounding curves could be fitted to three-layer resistivity models. The surface layer is moderately conductive (10 to 15 ohm-m), has a maximum thickness of 500 m, and consists mainly of alluvial fan and lake sediments. More conductive zones are associated with hydrothermally altered rocks; a resistivity high may be associated with siliceous hot spring deposits. The conductive second layer (2 to 5 ohm-m) varies in thickness from 400 to 800 m and thickens toward the center of the valley. This layer probably consists of lacustrine sediments saturated with saline waters. Local resistivity lows observed in the second layer may be related to elevated subsurface temperatures. This layer may act as a cap rock for the geothermal system. Resistivities of the third layer are high (50 to 100 ohm-m) except in a narrow 5-km band paralleling the range front. This low-resistivity zone, within volcanic rocks, correlates well in depth and location with reported zones of geothermal fluid production. It also seems to correlate with the western margin of a concealed graben structure previously inferred from other geophysical data.

Wilt, M.J.; Goldstein, N.E.

1983-04-01T23:59:59.000Z

404

Excitation of kinetic geodesic acoustic modes by drift waves in nonuniform plasmas Z. Qiu, L. Chen, and F. Zonca  

E-Print Network (OSTI)

Excitation of kinetic geodesic acoustic modes by drift waves in nonuniform plasmas Z. Qiu, L. Chen://scitation.aip.org/termsconditions. Downloaded to IP: 192.107.52.30 On: Thu, 06 Feb 2014 15:42:45 #12;Excitation of kinetic geodesic acoustic) Effects of system nonuniformities and kinetic dispersiveness on the spontaneous excitation of Geodesic

Zonca, Fulvio

405

Using ADCP Background Sound Levels to Estimate Wind Speed  

Science Journals Connector (OSTI)

It is well known that ambient sound is generated by wind through the process of wave breaking and bubble injection. The resulting sound levels are highly correlated with wind speed and, even though the physical process is not fully understood, ...

Len Zedel

2001-11-01T23:59:59.000Z

406

Cylindrical acoustic levitator/concentrator  

DOE Patents (OSTI)

A low-power, inexpensive acoustic apparatus for levitation and/or concentration of aerosols and small liquid/solid samples having particulates up to several millimeters in diameter in air or other fluids is described. It is constructed from a commercially available, hollow cylindrical piezoelectric crystal which has been modified to tune the resonance frequency of the breathing mode resonance of the crystal to that of the interior cavity of the cylinder. When the resonance frequency of the interior cylindrical cavity is matched to the breathing mode resonance of the cylindrical piezoelectric transducer, the acoustic efficiency for establishing a standing wave pattern in the cavity is high. The cylinder does not require accurate alignment of a resonant cavity. Water droplets having diameters greater than 1 mm have been levitated against the force of gravity using; less than 1 W of input electrical power. Concentration of aerosol particles in air is also demonstrated.

Kaduchak, Gregory (Los Alamos, NM); Sinha, Dipen N. (Los Alamos, NM)

2002-01-01T23:59:59.000Z

407

Acoustic characteristics of English fricatives  

E-Print Network (OSTI)

of noise spectrum, while there are some data suggesting that /f,v/ may be distin- guished from /Y,Z/ on the basis of transition information.a!Electronic mail: jongman@ukans.edu 1252 1252J. Acoust. Soc. Am. 108 (3), Pt. 1, Sep 2000 0001...! Variance ~MHz! Skewness Kurtosis /f,v/ 5108 6.37 0.077 2.11 /T,D/ 5137 6.19 20.083 1.27 /s,z/ 6133 2.92 20.229 2.36 /S,Z/ 4229 3.38 0.693 0.421257 J. Acoust. Soc. Am., Vol. 108, No. 3, Pt. 1, Sep 2000with h2 ranging from 0.001 for skewness to 0.004 for spec...

Jongman, Allard; Wayland, Ratree; Wong, Serena

2000-09-01T23:59:59.000Z

408

ACOUSTIC DETECTING AND LOCATING GAS PIPE LINE INFRINGEMENT  

SciTech Connect

The extensive network of high-pressure natural gas transmission pipelines covering the United States provides an important infrastructure for our energy independence. Early detection of pipeline leaks and infringements by construction equipment, resulting in corrosion fractures, presents an important aspect of our national security policy. The National Energy Technology Laboratory Strategic Center for Natural Gas (SCVG) is and has been funding research on various applicable techniques. The WVU research team has focused on monitoring pipeline background acoustic signals generated and transmitted by gas flowing through the gas inside the pipeline. In case of a pipeline infringement, any mechanical impact on the pipe wall, or escape of high-pressure gas, generates acoustic signals traveling both up and down stream through the gas. Sudden changes in flow noise are detectable with a Portable Acoustic Monitoring Package (PAMP), developed under this contract. It incorporates a pressure compensating microphone and a signal- recording device. Direct access to the gas inside the line is obtained by mounting such a PAMP, with a 1/2 inch NPT connection, to a pipeline pressure port found near most shut-off valves. An FFT of the recorded signal subtracted by that of the background noise recorded one-second earlier appears to sufficiently isolate the infringement signal to allow source interpretation. Using cell phones for data downloading might allow a network of such 1000-psi rated PAMP's to acoustically monitor a pipeline system and be trained by neural network software to positively identify and locate any pipeline infringement.

John L. Loth; Gary J. Morris; George M. Palmer; Richard Guiler; Patrick Browning

2004-12-01T23:59:59.000Z

409

ACOUSTIC DETECTING AND LOCATING GAS PIPE LINE INFRINGEMENT  

SciTech Connect

The extensive network of high-pressure natural gas transmission pipelines covering the United States provides an important infrastructure for our energy independence. Early detection of pipeline leaks and infringements by construction equipment, resulting in corrosion fractures, presents an important aspect of our national security policy. The National Energy Technology Laboratory Strategic Center for Natural Gas (SCVG) is and has been funding research on various applicable techniques. The WVU research team has focused on monitoring pipeline background acoustic signals generated and transmitted by gas flowing through the gas inside the pipeline. In case of a pipeline infringement, any mechanical impact on the pipe wall, or escape of high-pressure gas, generates acoustic signals traveling both up and down stream through the gas. Sudden changes in flow noise are detectable with a Portable Acoustic Monitoring Package (PAMP), developed under this contract. It incorporates a pressure compensating microphone and a signal- recording device. Direct access to the gas inside the line is obtained by mounting such a PAMP, with a 1/2 inch NPT connection, to a pipeline pressure port found near most shut-off valves. An FFT of the recorded signal subtracted by that of the background noise recorded one-second earlier appears to sufficiently isolate the infringement signal to allow source interpretation. Using cell phones for data downloading might allow a network of such 1000-psi rated PAMP's to acoustically monitor a pipeline system and be trained by neural network software to positively identify and locate any pipeline infringement.

John L. Loth; Gary J. Morris; George M. Palmer; Richard Guiler; Patrick Browning

2004-10-31T23:59:59.000Z

410

Vertical axis wind turbine acoustics  

E-Print Network (OSTI)

Vertical Axis Wind Turbine Acoustics Charlie Pearson Corpus Christi College Cambridge University Engineering Department A thesis submitted for the degree of Doctor of Philosophy September 2013 Declaration Described in this dissertation is work... quickly to changing wind conditions, small- scale vertical axis wind turbines (VAWTs) have been proposed as an efficient solution for deployment in built up areas, where the wind is more gusty in nature. If VAWTs are erected in built up areas...

Pearson, Charlie

2014-04-08T23:59:59.000Z

411

Detection of aeroacoustic sound sources on aircraft and wind turbines  

E-Print Network (OSTI)

Detection of aeroacoustic sound sources on aircraft and wind turbines Stefan Oerlemans #12;Detection of aeroacoustic sound sources on aircraft and wind turbines S. Oerlemans Thesis University;DETECTION OF AEROACOUSTIC SOUND SOURCES ON AIRCRAFT AND WIND TURBINES PROEFSCHRIFT ter verkrijging van de

Twente, Universiteit

412

Frustrated total internal reflection acoustic field sensor  

DOE Patents (OSTI)

A frustrated total internal reflection acoustic field sensor which allows the acquisition of the acoustic field over an entire plane, all at once. The sensor finds use in acoustic holography and acoustic diffraction tomography. For example, the sensor may be produced by a transparent plate with transparent support members tall enough to support one or more flexible membranes at an appropriate height for frustrated total internal reflection to occur. An acoustic wave causes the membrane to deflect away from its quiescent position and thus changes the amount of light that tunnels through the gap formed by the support members and into the membrane, and so changes the amount of light reflected by the membrane. The sensor(s) is illuminated by a uniform tight field, and the reflection from the sensor yields acoustic wave amplitude and phase information which can be picked up electronically or otherwise.

Kallman, Jeffrey S. (Pleasanton, CA)

2000-01-01T23:59:59.000Z

413

Random matrix theory for underwater sound propagation  

Science Journals Connector (OSTI)

Ocean acoustic propagation can be formulated as a wave guide with a weakly random medium generating multiple scattering. Twenty years ago, this was recognized as a quantum chaos problem, and yet random matrix theory, one pillar of quantum or wave chaos studies, has never been introduced into the subject. The modes of the wave guide provide a representation for the propagation, which in the parabolic approximation is unitary. Scattering induced by the ocean's internal waves leads to a power-law random banded unitary matrix ensemble for long-range deep-ocean acoustic propagation. The ensemble has similarities, but differs, from those introduced for studying the Anderson metal-insulator transition. The resulting long-range propagation ensemble statistics agree well with those of full wave propagation using the parabolic equation.

K. C. Hegewisch; S. Tomsovic

2012-01-01T23:59:59.000Z

414

Analog circuit for controlling acoustic transducer arrays  

DOE Patents (OSTI)

A simplified ananlog circuit is presented for controlling electromechanical transducer pairs in an acoustic telemetry system. The analog circuit of this invention comprises a single electrical resistor which replaces all of the digital components in a known digital circuit. In accordance with this invention, a first transducer in a transducer pair of array is driven in series with the resistor. The voltage drop across this resistor is then amplified and used to drive the second transducer. The voltage drop across the resistor is proportional and in phase with the current to the transducer. This current is approximately 90 degrees out of phase with the driving voltage to the transducer. This phase shift replaces the digital delay required by the digital control circuit of the prior art.

Drumheller, Douglas S. (Cedar Crest, NM)

1991-01-01T23:59:59.000Z

415

Classification of heart valve sounds from experiments in an anechoic water tank  

SciTech Connect

In vivo studies in both sheep and humans were plagued by a number of problems including movement artifacts, biological noise, low signal-to-noise ratio (SNR), chest-wall reverberation, and limited bandwidth recordings as discussed by [1]. To overcome these problems it was decided to record heart valve sounds under controlled conditions deep in an anechoic water tank, free from reverberation noise. The main goal of this experiment was to obtain measurements of ''pure'' heart valve sounds free of the scattering effects of the body. Experiments were conducted at the Transdec facility in San Diego [2]. We used a high quality hydrophone together with a wide-band data acquisition system [2]. We recorded sounds from 100 repetitions of the opening-closing cycles on each of 50 different heart valves, including 21 SLS valves and 29 intact valves. The power spectrum of the opening and closing phases of each cycle were calculated and outlier spectra removed as described by Candy [2]. In this report, we discuss the results of our classification of the heart valve sound measurements. The goal of this classification task was to apply the fundamental classification algorithms developed for the clinical data in 1994 and 1996 to the measurements from the anechoic water tank. From the beginning of this project, LLNL's responsibility has been to process and classify the heart valve sounds. For this experiment, however, we processed both the opening sounds and closing sounds for comparison purposes. The results of this experiment show that the classifier did not perform well because of low signal-to-noise ratio and excessive variability in signal power from beat-to-beat for a given valve.

Axelrod, M C; Clark, G A; Scott, D

1999-06-01T23:59:59.000Z

416

Puget Sound Dissolved Oxygen Modeling Study: Development of an Intermediate Scale Water Quality Model  

SciTech Connect

The Salish Sea, including Puget Sound, is a large estuarine system bounded by over seven thousand miles of complex shorelines, consists of several subbasins and many large inlets with distinct properties of their own. Pacific Ocean water enters Puget Sound through the Strait of Juan de Fuca at depth over the Admiralty Inlet sill. Ocean water mixed with freshwater discharges from runoff, rivers, and wastewater outfalls exits Puget Sound through the brackish surface outflow layer. Nutrient pollution is considered one of the largest threats to Puget Sound. There is considerable interest in understanding the effect of nutrient loads on the water quality and ecological health of Puget Sound in particular and the Salish Sea as a whole. The Washington State Department of Ecology (Ecology) contracted with Pacific Northwest National Laboratory (PNNL) to develop a coupled hydrodynamic and water quality model. The water quality model simulates algae growth, dissolved oxygen, (DO) and nutrient dynamics in Puget Sound to inform potential Puget Sound-wide nutrient management strategies. Specifically, the project is expected to help determine 1) if current and potential future nitrogen loadings from point and non-point sources are significantly impairing water quality at a large scale and 2) what level of nutrient reductions are necessary to reduce or control human impacts to DO levels in the sensitive areas. The project did not include any additional data collection but instead relied on currently available information. This report describes model development effort conducted during the period 2009 to 2012 under a U.S. Environmental Protection Agency (EPA) cooperative agreement with PNNL, Ecology, and the University of Washington awarded under the National Estuary Program

Khangaonkar, Tarang; Sackmann, Brandon S.; Long, Wen; Mohamedali, Teizeen; Roberts, Mindy

2012-10-01T23:59:59.000Z

417

Surface acoustic wave for microfluidic applications.  

E-Print Network (OSTI)

??Surface acoustic wave-based (SAW) microfluidics attracts attention from microfluidic research community due to its simple fabrication, large force and fast, yet efficient operation. The scope… (more)

Luong, Trung Dung.

2012-01-01T23:59:59.000Z

418

Acoustic concentration of particles in fluid flow  

SciTech Connect

An apparatus for acoustic concentration of particles in a fluid flow includes a substantially acoustically transparent membrane and a vibration generator that define a fluid flow path therebetween. The fluid flow path is in fluid communication with a fluid source and a fluid outlet and the vibration generator is disposed adjacent the fluid flow path and is capable of producing an acoustic field in the fluid flow path. The acoustic field produces at least one pressure minima in the fluid flow path at a predetermined location within the fluid flow path and forces predetermined particles in the fluid flow path to the at least one pressure minima.

Ward, Michael D. (Los Alamos, NM); Kaduchak, Gregory (Los Alamos, NM)

2010-11-23T23:59:59.000Z

419

Acoustic Concentration Of Particles In Fluid Flow  

NLE Websites -- All DOE Office Websites (Extended Search)

in a fluid flow includes a substantially acoustically transparent membrane and a vibration generator that define a fluid flow path therebetween. Available for thumbnail of...

420

Acoustic resonance for nonmetallic mine detection  

SciTech Connect

The feasibility of acoustic resonance for detection of plastic mines was investigated by researchers at the Oak Ridge National Laboratory`s Instrumentation and Controls Division under an internally funded program. The data reported in this paper suggest that acoustic resonance is not a practical method for mine detection. Representative small plastic anti-personnel mines were tested, and were found to not exhibit detectable acoustic resonances. Also, non-metal objects known to have strong acoustic resonances were tested with a variety of excitation techniques, and no practical non-contact method of exciting a consistently detectable resonance in a buried object was discovered. Some of the experimental data developed in this work may be useful to other researchers seeking a method to detect buried plastic mines. A number of excitation methods and their pitfalls are discussed. Excitation methods that were investigated include swept acoustic, chopped acoustic, wavelet acoustic, and mechanical shaking. Under very contrived conditions, a weak response that could be attributed to acoustic resonance was observed, but it does not appear to be practical as a mine detection feature. Transfer properties of soil were investigated. Impulse responses of several representative plastic mines were investigated. Acoustic leakage coupling, and its implications as a disruptive mechanism were investigated.

Kercel, S.W.

1998-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Numerical Modeling of Acoustic Timescale Detonation Initiation Using the Adaptive  

E-Print Network (OSTI)

Numerical Modeling of Acoustic Timescale Detonation Initiation Using the Adaptive Wavelet 2008 #12;This thesis entitled: Numerical Modeling of Acoustic Timescale Detonation Initiation Using. (Ph.D.) Numerical Modeling of Acoustic Timescale Detonation Initiation Using the Adaptive Wavelet

Vasilyev, Oleg V.

422

Physiological Bases of Acoustic LRT in Nonstutterers, Mild  

E-Print Network (OSTI)

Physiological Bases of Acoustic LRT in Nonstutterers, Mild Stutterers, and Severe Stutterers* Ben C stutterers' prolonged acoustic laryngeal reaction time (LRT) values. Prephonatory kinematic data were foreperiods. Acoustic data replicated a previously observed composite stuttering severity and foreperiod

423

Puget Sound Energy - Resource Conservation Manager Program | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Puget Sound Energy - Resource Conservation Manager Program Puget Sound Energy - Resource Conservation Manager Program Puget Sound Energy - Resource Conservation Manager Program < Back Eligibility Commercial Fed. Government Industrial Institutional Local Government Nonprofit Schools State Government Savings Category Heating & Cooling Home Weatherization Construction Commercial Weatherization Commercial Heating & Cooling Design & Remodeling Program Info State District of Columbia Program Type Utility Grant Program Rebate Amount Incentive determined as a percentage of the typical RCM salary to help get program started with initial set-up of utility database and program organization. Typically funded at 25% of the first year salary. Provider Puget Sound Energy Puget Sound Energy's (PSE) Resource Conservation Manager Program (RCM)

424

Sound?Power Production in Wind Instruments  

Science Journals Connector (OSTI)

This paper presents data for output sound powerP O of wind instruments relation to input power P I supplied by the player. P I was calculated as pV? where p equals mouth pressure and V? air flow rate through the instrument. P O was calculated from sound?pressure level and measurements of reverberation time in a live room of known volume. A part of the data was obtained in a room of unknown characteristics; from 15 comparable measurements on 8 different instruments in both the live and the unknown room data were obtained that allowed calculation of P O also from other experiments in the unknown room. Measurements were made on single notes played both pp and ff on each instrument; one low and one high note on the scale of each instrument were chosen. The ratio P O/P I representing the mechanical efficiency of wind instruments as sources of sound power varies from less than 0.001% to about 2%. It appears to increase with increasing P I and in some instruments with frequency. The consistent results obtained for 3 different flutes played by one performer suggest that the variability noted in the other data at least partially reflects individual differences in mechanical efficiency.

Arend Bouhuys

1965-01-01T23:59:59.000Z

425

Acoustic Monitoring of Beluga Whale Interactions with Cook Inlet Tidal Energy Project  

SciTech Connect

Cook Inlet, Alaska is home to some of the greatest tidal energy resources in the U.S., as well as an endangered population of beluga whales (Delphinapterus leucas). Successfully permitting and operating a tidal power project in Cook Inlet requires a biological assessment of the potential and realized effects of the physical presence and sound footprint of tidal turbines on the distribution, relative abundance, and behavior of Cook Inlet beluga whales. ORPC Alaska, working with the Project Team—LGL Alaska Research Associates, University of Alaska Anchorage, TerraSond, and Greeneridge Science—undertook the following U.S. Department of Energy (DOE) study to characterize beluga whales in Cook Inlet – Acoustic Monitoring of Beluga Whale Interactions with the Cook Inlet Tidal Energy Project (Project). ORPC Alaska, LLC, is a wholly-owned subsidiary of Ocean Renewable Power Company, LLC, (collectively, ORPC). ORPC is a global leader in the development of hydrokinetic power systems and eco-conscious projects that harness the power of ocean and river currents to create clean, predictable renewable energy. ORPC is developing a tidal energy demonstration project in Cook Inlet at East Foreland where ORPC has a Federal Energy Regulatory Commission (FERC) preliminary permit (P-13821). The Project collected baseline data to characterize pre-deployment patterns of marine mammal distribution, relative abundance, and behavior in ORPC’s proposed deployment area at East Foreland. ORPC also completed work near Fire Island where ORPC held a FERC preliminary permit (P-12679) until March 6, 2013. Passive hydroacoustic devices (previously utilized with bowhead whales in the Beaufort Sea) were adapted for study of beluga whales to determine the relative abundance of beluga whale vocalizations within the proposed deployment areas. Hydroacoustic data collected during the Project were used to characterize the ambient acoustic environment of the project site pre-deployment to inform the FERC pilot project process. The Project compared results obtained from this method to results obtained from other passive hydrophone technologies and to visual observation techniques performed simultaneously. This Final Report makes recommendations on the best practice for future data collection, for ORPC’s work in Cook Inlet specifically, and for tidal power projects in general. This Project developed a marine mammal study design and compared technologies for hydroacoustic and visual data collection with potential for broad application to future tidal and hydrokinetic projects in other geographic areas. The data collected for this Project will support the environmental assessment of future Cook Inlet tidal energy projects, including ORPC’s East Foreland Tidal Energy Project and any tidal energy developments at Fire Island. The Project’s rigorous assessment of technology and methodologies will be invaluable to the hydrokinetic industry for developing projects in an environmentally sound and sustainable way for areas with high marine mammal activity or endangered populations. By combining several different sampling methods this Project will also contribute to the future preparation of a comprehensive biological assessment of ORPC’s projects in Cook Inlet.

Worthington, Monty [Project Director - AK] [Project Director - AK

2014-02-05T23:59:59.000Z

426

Journal of Sound and Vibration (1998) 215(5), 10651099 Article No. sv981634  

E-Print Network (OSTI)

Journal of Sound and Vibration (1998) 215(5), 1065­1099 Article No. sv981634 THE EFFECTS OF IMPERFECTIONS ON THE PERFORMANCE OF THE SUBHARMONIC VIBRATION ABSORBER SYSTEM C.-P. CHAO AND S. W. SHAW of centrifugal pendulum vibration absorbers (CPVAs) that is very effective at reducing torsional vibration levels

Shaw, Steven W.

427

Federal Power Act section 202(c) - Cross-Sound Cable Company, August 2003 |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

3 3 Federal Power Act section 202(c) - Cross-Sound Cable Company, August 2003 On August 14, 2003, in response to the blackout on that day in the Northeast and Upper Midwest areas of the United States, as well as portion of Canada, the New York Independent System Operator and ISO New England were directed to require Cross-Sound Cable Company to operate the Cross-Sound Cable and related facilities. The Expiration date on that order was September 1, 2003, but on August 28, 2003, it was extended "until such time as emergency identified in the order ceases to exist." An order terminating the emergency order was issued on May 7, 2004. 202(c) order 202-03-1 August 14, 2003 - CSC.pdf 202(c) order 202-03-2 August 28, 2003 - CSC.pdf 202(c) order 202-03-3 September 26, 2003 - CSC.pdf

428

Combining SRP-PHAT and two Kinects for 3D Sound Source Localization  

Science Journals Connector (OSTI)

Abstract The Kinect™ has been developed to recognize gestures and voice commands, through a set of cameras and microphones, respectively. This paper proposes and evaluates low-cost Sound Source Localization (SSL) solution based this off-the-shelf equipment. It consists of employing a pair of Kinect devices as an alternative for microphone array, and executing the Steered Response Power using the \\{PHAse\\} Transform (SRP-PHAT) localization algorithm over acquired sound data. A fully functional prototype has been implemented and put to test under a realistic scenario. Experimental results indicate that although our approach is capable of achieving limited position estimation, and it can accurately point towards the source’s direction. Two different high performance versions of the algorithm have been implemented to improve overall system performance under 3D Sound Source Localization setup.

Lucas Adams Seewald; Luiz Gonzaga Jr.; Mauricio Roberto Veronez; Vicente Peruffo Minotto; Cláudio Rosito Jung

2014-01-01T23:59:59.000Z

429

Assessment of HVAC sound power data for sensitive spaces.  

Science Journals Connector (OSTI)

Certification testing of air handling unit sound power (PWL) indicates that individual unit PWL can vary significantly from manufacturer published data. Published data are typically based on a limited number of actual tests with results extrapolated for other fan sizes and operating conditions. Although published data are normally acceptable for routine applications indiscriminate use for sensitive designs (studios theaters conference centers etc.) can result in excessive finished space noise levels. The fact that the design goals have been exceeded can be accurately documented. The exact reason for the exceedance however cannot be as firmly established in a complex system. Certification PWL testing of air handling units prior to installation can detect PWL variations from the published data. Individual unit PWL certification was often not cost effective prior to the developement of sound intensity and the establishment and use of recognized standards for in situ PWL testing (e.g. ASA 104?1992 ANSI S.12.12.1992). Case histories to be presented document fan PWL variations from published data of up to 10 dB and higher in certain octave bands.

Kevin C. Miller; Martin J. Beam

1996-01-01T23:59:59.000Z

430

Harnessing fluid-structure interactions to design self-regulating acoustic metamaterials  

SciTech Connect

The design of phononic crystals and acoustic metamaterials with tunable and adaptive wave properties remains one of the outstanding challenges for the development of next generation acoustic devices. We report on the numerical and experimental demonstration of a locally resonant acoustic metamaterial with dispersion characteristics, which autonomously adapt in response to changes of an incident aerodynamic flow. The metamaterial consists of a slender beam featuring a periodic array or airfoil-shaped masses supported by a linear and torsional springs. The resonance characteristics of the airfoils lead to strong attenuation at frequencies defined by the properties of the airfoils and the speed on the incident fluid. The proposed concept expands the ability of existing acoustic bandgap materials to autonomously adapt their dispersion properties through fluid-structure interactions, and has the potential to dramatically impact a variety of applications, such as robotics, civil infrastructures, and defense systems.

Casadei, Filippo [School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138 (United States); Bertoldi, Katia [School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138 (United States); Kavli Institute for Bionano Science, Harvard University, Cambridge, Massachusetts 02138 (United States)

2014-01-21T23:59:59.000Z

431

Processing dipole acoustic logging data to image fracture network in shale gas reservoirs  

Science Journals Connector (OSTI)

A recent advance in borehole remote acoustic reflection imaging is the utilization of a dipole acoustic system in a borehole to emit and receive elastic waves to and from a remote geologic reflector in formation. An important application of this new technique is the delineation of fracture network in shale gas reservoirs as interest and activities in shale gas exploration increase in China. We develop a data processing procedure and implement it to handle routine processing of dipole acoustic logging data. The procedure takes into account the characteristics of the dipole data such as frequency dispersion attenuation recording length and dipole source orientation etc. to obtain an image of reflectors within 20~30 meters around the borehole. We have applied the technique to process dipole acoustic data from several wells drilled into gas reservoirs in China. The obtained images clearly identify major fracture network in the gas producing intervals of the reservoir demonstrating the effectiveness of the imaging technique.

Zhuang Chunxi; Su Yuanda; Tang Xiaoming

2012-01-01T23:59:59.000Z

432

Acoustics as a Human Science  

Science Journals Connector (OSTI)

There was a time when acoustics was only a human science but this changed as philosophers learned to use mathematical and other measurement tools for ordering and validating their thought processes. This century has seen many changes in the description of the field as a whole and the human aspects continue to be among the most perplexing. The highlights of accomplishments to date some observations on our current status of knowledge and some projections into the future are presented for your entertainment—if not for your information.

S. S. Stevens

1972-01-01T23:59:59.000Z

433

R. White, Comsol Acoustics Introduction, 2012  

E-Print Network (OSTI)

R. White, Comsol Acoustics Introduction, © 2012 Tutorial Created in Comsol 4.3 (2012) #12;R. White Variables ­ space and time (x,y,z,t) Dependent Variables ­ unknown field (such as u) #12;R. White, Comsol (such as u) #12;R. White, Comsol Acoustics Introduction, © 2012 Finite Element Analysis (FEA / FEM) ­ 1

White, Robert D.

434

Acoustics of technology enabled collaborative learning environments.  

Science Journals Connector (OSTI)

Collaborative classrooms and workstations are increasingly common in higher education buildings. These spaces present unique acoustical challenges that force designers to rethink traditional concepts and solutions. In student?centered classrooms the lecturer is removed as the visual and acoustical center of attention. Instead students are seated in groups around technology enabled workstations often facing away from the lecturer and other students. Acoustical conditions must support small?group interaction classroom discussion and learning via multimedia content. Outside the classroom collaborative workstations vary greatly but typically facilitate small?group interaction around a multimedia display and/or work surface. To promote impromptu use by students these spaces are often open to highly public areas of learning commons classroom buildings and digital libraries. Traditional noise control solutions fail to isolate these spaces without compromising their spontaneous feel and function. Despite obvious acoustical challenges both space types will continue to proliferate and new acoustical solutions must be developed.

Gregory A. Coudriet; Jeffery E. Babich

2010-01-01T23:59:59.000Z

435

Acoustic Building Infiltration Measurement System (ABIMS)  

Energy.gov (U.S. Department of Energy (DOE))

Lead Performer: Argonne National Laboratory - Lemont, IL Partner: Illinois Institute of Technology - Chicago, IL

436

Phased Array Ultrasonic Sound Field Mapping through Large-Bore Coarse Grained Cast Austenitic Stainless Steel (CASS) Components  

SciTech Connect

A sound field beam mapping exercise was conducted to assist in understanding the effects of coarse-grained microstructures found in cast austenitic stainless steel (CASS) materials on acoustic longitudinal wave propagation. Ultrasonic laboratory measurements were made on three specimens representing four different grain structures. Phased array (PA) probes were fixed on each specimen surface and excited in the longitudinal mode at specific angles while a point receiver was scanned in a raster pattern over the end of the specimen, generating a transmitted sound field image. Three probes operating at nominal frequencies of 0.5, 0.8, and 1.0 MHz were used. A 6.4 mm (0.25-in.) thick slice was removed from the specimen end and beam mapping was repeated three times, yielding four full sets of beam images. Data were collected both with a constant part path for each configuration (probe, specimen and slice, angle, etc.) and with a variable part path (fixed position on the surface). The base specimens and slices were then polished and etched to reveal measureable grain microstructures that were compared to the sound field interactions and scattering effects seen in the collected data.

Crawford, Susan L.; Cinson, Anthony D.; Prowant, Matthew S.; Coble, Jamie B.; Diaz, Aaron A.; Anderson, Michael T.

2012-09-01T23:59:59.000Z

437

acoustic impedance constructed: Topics by E-print Network  

NLE Websites -- All DOE Office Websites (Extended Search)

sound absorption coefficient, sound transmission loss, effective density and effective bulk modulus) regarded here as an equivalent fluid. Second, an indirect characterization...

438

Interference mechanisms of acoustic/convective disturbances in a swirl-stabilized lean-premixed combustor  

Science Journals Connector (OSTI)

Interference mechanisms of acoustic/convective disturbances were experimentally investigated in a swirl-stabilized lean-premixed gas turbine combustor operated with natural gas fuel and air at atmospheric pressure and elevated temperature. Interference between azimuthal and acoustic velocity disturbances at high-amplitude limit cycle oscillations is characterized in detail as a function of axial swirler location, oscillation frequency, and mean nozzle velocity. We show that both the frequency and the intensity of self-excited instabilities in a model gas turbine combustor are correlated with axial swirler position, which indicates that a vorticity wave generated at the swirl vanes is a primary source of convective disturbances in the absence of equivalence ratio nonuniformities. Flame transfer function measurements confirm that the linear/nonlinear heat release response is a strong function of axial swirler location, even when unforced flame structures remain unchanged. The key parameter controlling this phenomenon is the phase difference between the azimuthal and acoustic velocity perturbations at the combustor dump plane; the phase difference is affected by swirler location, frequency, mean velocity, and the speed of sound. It was found that out-of-phase interference between azimuthal and acoustic velocity disturbances at the combustor inlet yields large flame angle fluctuations in relation to swirl number fluctuations, and therefore the formation of a coherent structure is hindered due to high kinematic viscosity within the vortex formation region. In-phase interference mechanisms, on the other hand, lead to high-amplitude limit cycle oscillations. This interference mechanism is then explored in the presence of temporal equivalence ratio nonuniformities, in which two different sources of convective mechanisms should be considered simultaneously in connection with acoustic velocity perturbations and the vortex dynamics. Results reveal that equivalence ratio oscillation has a significant effect on the strength of combustion-acoustic interactions. Strong self-excited instabilities of partially premixed flames are produced by in-phase interactions between acoustic velocity and equivalence ratio oscillations, which are governed by fuel injection location, frequency, mean nozzle velocity, and fuel injector impedance. At this phase condition, unburned reactants with high equivalence ratio impinge on the flame front with high inlet velocity, potentially causing large fluctuations of heat release rate.

Kyu Tae Kim; Dom A. Santavicca

2013-01-01T23:59:59.000Z

439

Acoustic microscopy for characterization of high?temperature superconducting tape  

Science Journals Connector (OSTI)

Although material scientists constantly discover superconducting compounds with higher critical temperatures (T c ’s) manufacturing of the high?temperature superconductors(HTS) remains a problem and long lengths (>1 mile) have yet to be produced. In an effort to produce long length superconductors manufacturing steps for HTS tape production have been critically looked at to find their effects in producing tape with the desired characteristics. In support of determining superconducting tapecharacteristics acoustic microscopy offers the potential for internal microstructural material characterization. This research will ultimately support in?process monitoring of HTSmanufacturing as part of an advanced sensing system to determine the presence of defects and/or the effects of process variables on the HTS tape. This presentation will overview scanning acoustic microscopy and present images of HTS tape at several frequencies ranging from 50 to 500 MHz. The results clearly demonstrate the feasibility of determining the Ag/ceramic interface location and the general integrity of the constituents.

Chiaki Miyasaka; Chris Cobucci; Bernhard Tittmann

1997-01-01T23:59:59.000Z

440

Effective speed of sound in phononic crystals  

E-Print Network (OSTI)

A new formula for the effective quasistatic speed of sound $c$ in 2D and 3D periodic materials is reported. The approach uses a monodromy-matrix operator to enable direct integration in one of the coordinates and exponentially fast convergence in others. As a result, the solution for $c$ has a more closed form than previous formulas. It significantly improves the efficiency and accuracy of evaluating $c$ for high-contrast composites as demonstrated by a 2D example with extreme behavior.

A. A. Kutsenko; A. L. Shuvalov; A. N. Norris

2011-06-27T23:59:59.000Z

Note: This page contains sample records for the topic "acoustic sounding system" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Sound Coiled-Tubing Drilling Practices  

SciTech Connect

This Coiled-Tubing Drilling (CTD) Sound Practices Manual provides tools needed by CTD engineers and supervisors to plan, design and perform safe, successful CTD operations. As emphasized throughout, both careful planning and attention to detail are mandatory for success. A bibliography of many useful CTD references is presented in Chapter 6. This manual is organized according to three processes: 1) Pre-Job Planning Process, 2) Operations Execution Process, and 3) Post-Job Review Process. Each is discussed in a logical and sequential format.

Williams, Thomas; Deskins, Greg (Maurer Technology Inc.); Ward, Stephen L. (Advantage Energy Services Ltd); Hightower, Mel

2001-09-30T23:59:59.000Z

442

Sound velocity bound and neutron stars  

E-Print Network (OSTI)

It has been conjectured that the velocity of sound in any medium is smaller than the velocity of light in vacuum divided by $\\sqrt{3}$. Simple arguments support this bound in non-relativistic and/or weakly coupled theories. The bound has been demonstrated in several classes of strongly coupled theories with gravity duals and is saturated only in conformal theories. We point out that the existence of neutron stars with masses around two solar masses combined with the knowledge of the equation of state of hadronic matter at "low" densities is in strong tension with this bound.

Paulo F. Bedaque; Andrew W. Steiner

2015-01-25T23:59:59.000Z

443

Sound Absorption in the Pacific Ocean  

Science Journals Connector (OSTI)

The absorption of sound in the Pacific Ocean at a nominal frequency of 75 kHz was measured over a horizontal path at depths of 910 and 3350 m. The results are 20.0±1.5 dB/km and 13.5±1.5 dB/km respectively which may be compared to values of 27.3 dB/km and 22.7 dB/km extrapolated from the empirical relation of Schulkin and Marsh. Evidently the useful range of this relation is severely limited. In addition the effect of pressure may be greater than previously suspected.

H. F. Bezdek

1972-01-01T23:59:59.000Z

444

Investigation of modal processing for low frequency acoustic communications in shallow water  

Science Journals Connector (OSTI)

Acoustic receptions at a vertical line array collected during the SW06 experiment were processed to show the feasibility of broadband mode decomposition as a preprocessing method to shorten time-spread and concentrate received signal energy in a small number of independent channels. The vertical array spanned the water column from 12 m depth to the bottom. PSK m-sequence modulated signals with different carrier frequencies were transmitted from a distance of 19.2 km. Signals were processed for both the case of ordinary internal waves activity and the case with abnormally strong internal wave solitons. The measured sound velocity and known bottom properties were accounted for. Mode filtering was based on a broadband pseudo-inverse processing of the received VLA signals. The broadband mode filtering decomposed the received signal into a number of independent signals with a reduced time-spread. The constellation of signals from the output of mode filters showed that a simple demodulator can achieve a high quality reception. Even during strong internal waves activity the acoustic energy was concentrated in a small number of the first acoustical modes. The receiver estimated the mode-time intensity distribution and used the strongest modes for demodulation. High quality reception is demonstrated with the data.

Andrey K. Morozov; James C. Preisig; Joseph C. Papp

2008-01-01T23:59:59.000Z

445

Investigation of modal processing for low frequency acoustic communications in shallow water  

Science Journals Connector (OSTI)

Acoustic receptions at a vertical line array collected during the SW06 experiment were processed to show the feasibility of broadband mode decomposition as a preprocessing method to shorten time?spread and concentrate received signal energy in a small number of independent channels. The vertical array spanned the water column from 12 m depth to the bottom. PSK m?sequence modulated signals with different carrier frequencies were transmitted from a distance of 19.2 km. Signals were processed for both the case of ordinary internal waves activity and the case with abnormally strong internal wavesolitons. The measured sound velocity and known bottom properties were accounted for. Mode filtering was based on a broadband pseudo?inverse processing of the received VLA signals. The broadband mode filtering decomposed the received signal into a number of independent signals with a reduced time?spread. The constellation of signals from the output of mode filters showed that a simple demodulator can achieve a high quality reception. Even during strong internal waves activity the acoustic energy was concentrated in a small number of the first acoustical modes. The receiver estimated the mode?time intensity distribution and used the strongest modes for demodulation. High quality reception is demonstrated with the data.

Andrey Morozov; James Preisig; Joseph Papp

2008-01-01T23:59:59.000Z

446

Laser light scattering by bubbles in water: Fundamentals and applications to acoustics.  

Science Journals Connector (OSTI)

Laser light scattering is sometimes used as an alternative to acoustical methods for monitoring bubbles in seawater. There has also been interest in using lasers to investigate bubbles in wakes. In some cases light scattering by bubbles has been used in conjunction with acoustical measurements to characterize dynamics of bubbles radiating sound [J. S. Stroud and P. L. Marston J. Acoust. Soc. Am. 94 2788–2792 (1993)]. In applications such as these it is important to understand the optical properties of bubbles that differ significantly from drops and particles. Examples include critical angle scattering and the transition to total reflection [D. S. Langley and P. L. Marston Appl. Opt. 23 1044–1054 (1984)] forward scattering and extinction [D. S. Langley and P. L. Marston Appl. Opt. 30 3452–3458 (1991); J. S. Stroud and P. L. Marston cited previously] glory back?scattering enhancements and shape effects [W. P. Arnott and P. L. Marston J. Opt. Soc. Am. A5 496–506 (1988); Appl. Opt. 30 3429–3442 (1991)] and Brewster angle scattering. Some optical effects of coatings on bubbles (which can occur naturally) have also been modeled [P. L. Marston Appl. Opt. 30 3479–3484 (1991)]. [Research supported by ONR between 1980 and 1995.

2009-01-01T23:59:59.000Z

447

Development of an Acoustic Sensor On-Line Gas Temperature Measurement in Gasifiers  

SciTech Connect

This project was awarded under U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) Program Solicitation DE-PS26-02NT41422 and specifically addresses Technical Topical Area 2 - Gasification Technologies. The project team includes Enertechnix, Inc. as the main contractor and ConocoPhillips Company as a technical partner, who also provides access to the SG Solutions Gasification Facility (formerly Wabash River Energy Limited), host for the field-testing portion of the research. The objective of this project was to adapt acoustic pyrometer technology to make it suitable for measuring gas temperature inside a coal gasifier, to develop a prototype sensor based on this technology, and to demonstrate its performance through testing on a commercial gasifier. The project was organized in three phases, each of approximately one year duration. The first phase consisted of researching a variety of sound generation and coupling approaches suitable for use with a high pressure process, evaluation of the impact of gas composition variability on the acoustic temperature measurement approach, evaluation of the impact of suspended particles and gas properties on sound attenuation, evaluation of slagging issues and development of concepts to deal with this issue, development and testing of key prototype components to allow selection of the best approaches, and development of a conceptual design for a field prototype sensor that could be tested on an operating gasifier. The second phase consisted of designing and fabricating a series of prototype sensors, testing them in the laboratory, and developing a conceptual design for a field prototype sensor. The third phase consisted of designing and fabricating the field prototype, and testing it in the lab and in a commercial gasifier to demonstrate the ability to obtain accurate measurements of gas temperature in an operating gasifier. Following the completion of the initial 3 year project, several continuations were awarded by the Department of Energy to allow Enertechnix to conduct extended testing of the sensor at the Wabash River facility. In February, 2008 the sensor was installed on the gasifier in preparation for a long-term test. During the initial testing of the sensor a stainless steel tube on the sensor failed and allowed syngas to escape. The syngas self-ignited and the ensuing small fire damaged some of the components on the sensor. There was no damage to the gasifier or other equipment and no injuries resulted from this incident. Two meetings were held to identify the root causes of the incident-one at Wabash River and one at Enertechnix. A list of recommended improvements that would have addressed the causes of the incident was created and presented to the Department of Energy on May 2, 2008. However, the DOE decided not to pursue these improvements and terminated the project. This report describes all of the activities conducted during the project and reports the findings of each activity in detail. The investigation of potential sound generation and coupling methods led to the selection of a reflected shock method which has been developed into a functioning prototype device. The principles of operation of this device and its performance characteristics are described in the report. Modeling of the attenuation of sound by suspended particles and by interaction of the sound pulses with the high temperature syngas inside the gasifier was conducted and the predictions of those models were used to determine the required sound pulse intensity to allow the sound pulses to be detected after passage through the gasifier environment. These modeling results are presented in this report. A study of the likely spatial and temporal variability of gas composition inside the gasifier was performed and the results of that study was used to predict the impact of that variability on the accuracy of the acoustic temperature method. These results are reported here. A design for a port rodding mechanism was developed to deal with potential slagging issues and was incorporated i

Peter Ariessohn

2008-06-30T23:59:59.000Z

448

R. White, Comsol Acoustics Introduction, 2/25/08  

E-Print Network (OSTI)

R. White, Comsol Acoustics Introduction, 2/25/08 #12;R. White, Comsol Acoustics Introduction, 2,y,z,t) Dependent Variables ­ unknown field (such as u) #12;R. White, Comsol Acoustics Introduction, 2/25/08 Finite ­ space and time (x,y,z,t) Dependent Variables ­ unknown field (such as u) #12;R. White, Comsol Acoustics

White, Robert D.

449

Massachusetts Wind Turbine Acoustics Research Project—Goals and preliminary results  

Science Journals Connector (OSTI)

The Commonwealth of Massachusetts (USA) has 43 operating wind turbine projects of 100 kW or more. At several of these projects noise complaints have been made to state authorities. The Massachusetts Clean Energy Center which provides funding for early stage analysis and development of wind power projects and the Massachusetts Department of Environmental Protection which regulates noise launched the project to increase understanding of (1) wind turbine acoustic impacts taking into account variables such as wind turbine size technology wind speed topography and distance and (2) the generation propagation and measurement of sound around wind turbine projects to inform policy-makers on how pre- and post-construction wind turbine noise studies should be conducted. This study involved the collection of detailed sound and meteorological data at five locations. The resulting database and interim reports contain information on infrasound and audible frequencies including amplitude modulation tonality and level. Analyses will include how the effects of wind shear and other variables may affect these parameters. Preliminary findings reflect the effects of meteorological conditions on wind turbine sound generation and propagation.

2014-01-01T23:59:59.000Z

450

Influence of boundary slip on the acoustical properties of microfibrous absorbents  

Science Journals Connector (OSTI)

In the past decades a variety of new highly porous materials with unusually small pores have been manufactured. In aerogels for instance pores can be less than 20 nm in diameter. The conventional models have to be modified when applied to describe acoustical properties of those materials. The non?slip condition on a pore surface is no longer valid and needs to be replaced by the Knudsen boundary condition. In attempt to provide an insight into the behaviour of microfibrous materials an analytical model has been developed which accounts for the boundary slip in a medium consisting of rigid parallel fibres assuming different directions of sound propagation with respect to fibres. It has been shown that the presence of the boundary slip leads to a significant change in model predictions. For instance in a material with fibre radius 80 nm and 95% porosity the sound speed decreases and attenuation increases by more than 20% compared to the values obtained assuming no boundary slip. The effect is stronger for smaller size fibres lower porosity values and for sound propagating parallel to fibres. Numerical computations have been performed to simulate oscillatory flow around the cylindrical fibres assuming Knudsen boundary conditions and the results have been compared with the analytical model predictions

Olga Umnova; David Tsiklauri; Rodolfo Venegas

2008-01-01T23:59:59.000Z

451

Acoustic propagation in the coastal environment of the Florida Straits—recent experimental results  

Science Journals Connector (OSTI)

An autonomous source was moored at ranges of 10 and then 20 km from a vertical receiver array with 32 elements in a depth of 145 m of water. M sequences were transmitted for 28 days at six center frequencies from 100 to 3200 in one octave increments. Arrivals and paths are identified with models and then fluctuation statistics coherence and predictability are examined in a parameter space of frequency range and receiver depth. A group of refracted?bottom?reflected (RBR) modes/rays has nearly equal group velocities and tends to focus in time and depth forming intense arrivals especially at the depth of the transmitted. A second group of surface reflected bottom reflected (SRBR) modes produce arrivals that fan out in time. Coastal areas inside western boundary currents have exceptionally variable sound speed fields owing to dynamical effects such as meanders shelf waves eddies coastal upwelling and energetic internal waves and tides. Sound speed fluctuations are observed to be an order greater than the deep ocean. Very large changes in mean sound speed profiles and extreme gradients occur at subinertial periods. Also potential energy of the internal wave field varies with the same longer periods as do statistical properties of observed acoustic signals.

2002-01-01T23:59:59.000Z

452

Aero-acoustics of silicone rubber lip reeds for alternative voice production in laryngectomees  

Science Journals Connector (OSTI)

To improve voice quality after laryngectomy a small pneumatic sound source to be incorporated in a regular tracheoesophageal shunt valve was designed. This artificial voice source consists of a single floppy lip reed which performs self-sustaining flutter-type oscillations driven by the expired pulmonary air that flows through the tracheoesophageal shunt valve along the outward-striking lip reed. In this in vitro study aero-acoustic data and detailed high-speed digital image sequences of lip reed behavior are obtained for 10 lip configurations. The high-speed visualizations provide a more explicit understanding and reveal details of lip reed behavior such as the onset of vibration beating of the lip against the walls of its housing and chaotic behavior at high volume flow. We discuss several aspects of lip reed behavior in general and implications for its application as an artificial voice source. For pressures above the sounding threshold volume flow fundamental frequency and sound pressure level generated by the floppy lip reed are almost linear functions of the driving force static pressure difference across the lip. Observed irregularities in these relations are mainly caused by transitions from one type of beating behavior of the lip against the walls of its housing to another. This beating explains the wide range and the driving force dependence of fundamental frequency and seems to have a strong effect on the spectral content. The thickness of the lip base is linearly related to the fundamental frequency of lip reed oscillation.

Marein van der Torn; Hans F. Mahieu; Joost M. Festen

2001-01-01T23:59:59.000Z

453

Puget Sound Energy - Commercial Retrofit Energy Efficiency Grant Program |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Puget Sound Energy - Commercial Retrofit Energy Efficiency Grant Puget Sound Energy - Commercial Retrofit Energy Efficiency Grant Program Puget Sound Energy - Commercial Retrofit Energy Efficiency Grant Program < Back Eligibility Commercial Fed. Government Industrial Local Government Nonprofit State Government Savings Category Heating & Cooling Commercial Heating & Cooling Heating Cooling Home Weatherization Construction Commercial Weatherization Design & Remodeling Manufacturing Other Heat Pumps Appliances & Electronics Commercial Lighting Lighting Program Info State District of Columbia Program Type Utility Grant Program Rebate Amount Up to 70% of installed cost of qualifying retrofit projects or up to 50% of qualifying lighting upgrades. Provider Puget Sound Energy PSE can provide a custom retrofit grant for any energy-efficiency project

454

Sound propagation in the nonhomogeneous ocean with currents  

Science Journals Connector (OSTI)

One considers the problem of sound propagation in the nonhomogeneous ocean with currents, where the characteristics of the medium vary...oco?1, ...

N. S. Grigor'eva

1985-09-10T23:59:59.000Z

455

Electromagnetic Soundings At Dixie Valley Geothermal Area (Mallan...  

Open Energy Info (EERE)

Mallan, Et Al., 2001) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Electromagnetic Soundings At Dixie Valley Geothermal Area (Mallan, Et Al.,...

456

Vertical Electrical Sounding Configurations At Mt Princeton Hot...  

Open Energy Info (EERE)

navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Vertical Electrical Sounding Configurations At Mt Princeton Hot Springs Geothermal Area (Zohdy, Et Al.,...

457

Schlumberger soundings in the Upper Raft River and Raft River...  

Open Energy Info (EERE)

Schlumberger soundings in the Upper Raft River and Raft River Valleys, Idaho and Utah Abstract In 1975, the U.S. Geological Survey made seventy Schlumberger resistivity...

458

22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 1 Kinetic theory of Geodesic Acoustic  

E-Print Network (OSTI)

22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 1 Kinetic theory of Geodesic Acoustic Zonca, Liu Chen and Zhiyong Qiu #12;22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 2 Chen and Zhiyong Qiu #12;22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 3 2 Linear

Zonca, Fulvio

459

Writing magnetic patterns with surface acoustic waves  

SciTech Connect

A novel patterning technique that creates magnetization patterns in a continuous magnetostrictive film with surface acoustic waves is demonstrated. Patterns of 10??m wide stripes of alternating magnetization and a 3??m dot of reversed magnetization are written using standing and focusing acoustic waves, respectively. The magnetization pattern is size-tunable, erasable, and rewritable by changing the magnetic field and acoustic power. This versatility, along with its solid-state implementation (no moving parts) and electronic control, renders it as a promising technique for application in magnetic recording, magnonic signal processing, magnetic particle manipulation, and spatial magneto-optical modulation.

Li, Weiyang; Buford, Benjamin; Jander, Albrecht; Dhagat, Pallavi, E-mail: dhagat@eecs.oregonstate.edu [School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, Oregon 97331 (United States)

2014-05-07T23:59:59.000Z

460

Acoustic probing of salt using sonar  

E-Print Network (OSTI)

ACOUSTIC PROBING OF SALT USING SONAR A Thesis by KENNETH BRYAN BUTLER Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE Oecember 1977 Major Subject...: Geophysics ACOUSTIC PROBING OF SALT USING SONAR A Thesis by KENNETH BRYAN BUTLER Approved as to style and content by: C airman of Com ttee ea of e r nt em er ember December 1977 ABSTRACT Acoustic Probing of Salt Using Sonar. (December 1977...

Butler, Kenneth Bryan

2012-06-07T23:59:59.000Z

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461

Design Parameters of a Miniaturized Piezoelectric Underwater Acoustic Transmitter  

SciTech Connect

The Juvenile Salmon Acoustic Telemetry System (JSATS) project supported by the U.S. Army Corps of Engineers, Portland District, has yielded the smallest acoustic fish tag transmitter commercially available to date. In order to study even smaller fish populations and make the transmitter injectable by needles, the JSATS acoustic micro transmitter needs to be further downsized. As part of the transmitter downsizing effort some of the design parameters of the lead zirconate titanate (PZT) ceramic tube transducer in the transmitter were studied, including the type of PZT, the backing material, the necessary drive voltage, the transmitting bandwidth and the length of the transducer. It was found that, to satisfy the 156-dB source level requirement of JSATS, a square wave with a 10-volt amplitude is required to drive 'soft' PZT transducers. PZT-5H demonstrated the best source level performance. For Navy types I and II, 16 volts or 18 volts were needed. Ethylene-propylene-diene monomer (EPDM) closed-cell foam was found to be the backing material providing the highest source level. The effect of tube length on the source level is also demonstrated in this paper, providing quantitative information for downsizing of small piezoelectric transmitters.

Li, Huidong; Deng, Zhiqun; Yuan, Yong; Carlson, Thomas J.

2012-07-02T23:59:59.000Z

462

Spectral line width decrease in the solar corona: resonant energy conversion from Alfv{é}n to acoustic waves  

E-Print Network (OSTI)

Observations reveal an increase with height of the line width of several coronal spectral lines probably caused by outwardly propagating Alfv{\\'e}n waves. However, the spectral line width sometimes shows a sudden decrease at a height 0.1-0.2 R, where the ratio of sound to Alfven speeds may approach unity. Qualitative analysis shows that the resonant energy conversion from Alfven to acoustic waves near the region of the corona where the plasma $\\beta$ approaches unity may explain the observed spectral line width reduction.

T. V. Zaqarashvili; R. Oliver; J. L. Ballester

2007-03-13T23:59:59.000Z