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Note: This page contains sample records for the topic "rotor rotor speed-the" 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.


1

Separators for flywheel rotors  

DOE Patents (OSTI)

A separator forms a connection between the rotors of a concentric rotor assembly. This separator allows for the relatively free expansion of outer rotors away from inner rotors while providing a connection between the rotors that is strong enough to prevent disassembly. The rotor assembly includes at least two rotors referred to as inner and outer flywheel rings or rotors. This combination of inner flywheel ring, separator, and outer flywheel ring may be nested to include an arbitrary number of concentric rings. The separator may be a segmented or continuous ring that abuts the ends of the inner rotor and the inner bore of the outer rotor. It is supported against centrifugal loads by the outer rotor and is affixed to the outer rotor. The separator is allowed to slide with respect to the inner rotor. It is made of a material that has a modulus of elasticity that is lower than that of the rotors. 10 figs.

Bender, D.A.; Kuklo, T.C.

1998-07-07T23:59:59.000Z

2

Separators for flywheel rotors  

DOE Patents (OSTI)

A separator forms a connection between the rotors of a concentric rotor assembly. This separator allows for the relatively free expansion of outer rotors away from inner rotors while providing a connection between the rotors that is strong enough to prevent disassembly. The rotor assembly includes at least two rotors referred to as inner and outer flywheel rings or rotors. This combination of inner flywheel ring, separator, and outer flywheel ring may be nested to include an arbitrary number of concentric rings. The separator may be a segmented or continuous ring that abuts the ends of the inner rotor and the inner bore of the outer rotor. It is supported against centrifugal loads by the outer rotor and is affixed to the outer rotor. The separator is allowed to slide with respect to the inner rotor. It is made of a material that has a modulus of elasticity that is lower than that of the rotors.

Bender, Donald A. (Dublin, CA); Kuklo, Thomas C. (Oakdale, CA)

1998-01-01T23:59:59.000Z

3

Radial-Radial Single Rotor Turbine  

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

Radial-Radial Single Rotor Turbine Radial-Radial Single Rotor Turbine A rotor for use in turbine applications. June 26, 2013 Radial-Radial Single Rotor Turbine A rotor for use in...

4

Single Rotor Turbine  

DOE Patents (OSTI)

A rotor for use in turbine applications has a centrifugal compressor having axially disposed spaced apart fins forming passages and an axial turbine having hollow turbine blades interleaved with the fins and through which fluid from the centrifugal compressor flows.

Platts, David A. (Los Alamos, NM)

2004-10-26T23:59:59.000Z

5

Main Generator Rotor Maintenance  

Science Conference Proceedings (OSTI)

Main generator rotors are constructed and designed to provide decades of reliable and trouble-free operation. However, a number of incidences have occurred over the years that can adversely impact reliable operation of generator rotors and, ultimately, production of electrical power. This report is a guide for power plant personnel responsible for reliable operation and maintenance of main generators. As a guide, this report provides knowledge and experience from generator experts working at power plants...

2006-11-27T23:59:59.000Z

6

ROTOR END CAP  

DOE Patents (OSTI)

An improved end cap is described for the cylindrical rotor or bowl of a high-speed centrifugal separator adapted to permit free and efficient continuous counter current flow of gas therethrough for isotope separation. The end cap design provides for securely mounting the same to the hollow central shaft and external wall of the centrifuge. Passageways are incorporated and so arranged as to provide for continuous counter current flow of the light and heavy portions of the gas fed to the centrifuge.

Rushing, F.C.

1959-02-01T23:59:59.000Z

7

Single rotor turbine engine  

SciTech Connect

There has been invented a turbine engine with a single rotor which cools the engine, functions as a radial compressor, pushes air through the engine to the ignition point, and acts as an axial turbine for powering the compressor. The invention engine is designed to use a simple scheme of conventional passage shapes to provide both a radial and axial flow pattern through the single rotor, thereby allowing the radial intake air flow to cool the turbine blades and turbine exhaust gases in an axial flow to be used for energy transfer. In an alternative embodiment, an electric generator is incorporated in the engine to specifically adapt the invention for power generation. Magnets are embedded in the exhaust face of the single rotor proximate to a ring of stationary magnetic cores with windings to provide for the generation of electricity. In this alternative embodiment, the turbine is a radial inflow turbine rather than an axial turbine as used in the first embodiment. Radial inflow passages of conventional design are interleaved with radial compressor passages to allow the intake air to cool the turbine blades.

Platts, David A. (Los Alamos, NM)

2002-01-01T23:59:59.000Z

8

Rotor Noise in Maneuvering Flight.  

E-Print Network (OSTI)

??The objective of this research is to understand the physics of rotor noise in the maneuvering flight. To achieve this objective, an integrated noise prediction… (more)

Chen, Hsuan-nien

2006-01-01T23:59:59.000Z

9

Homopolar motor with dual rotors  

DOE Patents (OSTI)

A homopolar motor has a field rotor mounted on a frame for rotation in a first rotational direction and for producing an electromagnetic field, and an armature rotor mounted for rotation on said frame within said electromagnetic field and in a second rotational direction counter to said first rotational direction of said field rotor. The two rotors are coupled through a 1:1 gearing mechanism, so as to travel at the same speed but in opposite directions. This doubles the output voltage and output power, as compared to a motor in which only the armature is rotated. Several embodiments are disclosed. 7 figs.

Hsu, J.S.

1998-12-01T23:59:59.000Z

10

Recurrent Rotor-Router Configurations  

E-Print Network (OSTI)

We prove the existence of recurrent initial configurations for the rotor walk on many graphs, including Z^d, and planar graphs with locally finite embeddings. We also prove that recurrence and transience of rotor walks are invariant under changes in the starting vertex and finite changes in the initial configuration.

Angel, Omer

2011-01-01T23:59:59.000Z

11

Recurrent Rotor-Router Configurations  

E-Print Network (OSTI)

We prove the existence of recurrent initial configurations for the rotor walk on many graphs, including Z d, and planar graphs with locally finite embeddings. We also prove that recurrence and transience of rotor walks are invariant under changes in the starting vertex and finite changes in the initial configuration.

Omer Angel; Alexander E. Holroyd

2011-01-01T23:59:59.000Z

12

Brake rotor design and comparison using finite element analysis : an investigation in topology optimization  

E-Print Network (OSTI)

and Rotor Figures . . . . . . . . . . . . . . . . . .Appendix D Unsatisfactory RotorAppendix G Supplemental Rotor Symmetrical Instance

Domond, Kenneth

2010-01-01T23:59:59.000Z

13

Wind turbine rotor aileron  

DOE Patents (OSTI)

A wind turbine has a rotor with at least one blade which has an aileron which is adjusted by an actuator. A hinge has two portions, one for mounting a stationary hinge arm to the blade, the other for coupling to the aileron actuator. Several types of hinges can be used, along with different actuators. The aileron is designed so that it has a constant chord with a number of identical sub-assemblies. The leading edge of the aileron has at least one curved portion so that the aileron does not vent over a certain range of angles, but vents if the position is outside the range. A cyclic actuator can be mounted to the aileron to adjust the position periodically. Generally, the aileron will be adjusted over a range related to the rotational position of the blade. A method for operating the cyclic assembly is also described.

Coleman, Clint (Warren, VT); Kurth, William T. (Warren, VT)

1994-06-14T23:59:59.000Z

14

Optimized Maintenance of Generator Rotors  

Science Conference Proceedings (OSTI)

Generator rotor maintenance options are limited and expensive. The timing and scope of work done requires optimization to obtain the maximum benefits for continued long-term trouble-free operation. This document is a comprehensive guide to the maintenance of large generator rotors of 2 and 4 pole design that are cooled directly or indirectly by air or hydrogen. These include 50 and 60 Hz machines, operating at speeds of 1500, 1800, 3000, and 3600 RPM. The guide does not cover water-cooled rotors. The inf...

2004-12-13T23:59:59.000Z

15

Rotor assembly and assay method  

DOE Patents (OSTI)

A rotor assembly for carrying out an assay includes a rotor body which is rotatable about an axis of rotation, and has a central chamber and first, second, third, fourth, fifth, and sixth chambers which are in communication with and radiate from the central chamber. The rotor assembly further includes a shuttle which is movable through the central chamber and insertable into any of the chambers, the shuttle including a reaction cup carrying an immobilized antigen or an antibody for transport among the chambers. A method for carrying out an assay using the rotor assembly includes moving the reaction cup among the six chambers by passing the cup through the central chamber between centrifugation steps in order to perform the steps of: separating plasma from blood cells, binding plasma antibody or antigen, washing, drying, binding enzyme conjugate, reacting with enzyme substrate and optically comparing the resulting reaction product with unreacted enzyme substrate solution. The movement of the reaction cup can be provided by attaching a magnet to the reaction cup and supplying a moving magnetic field to the rotor.

Burtis, Carl A. (Oak Ridge, TN); Johnson, Wayne F. (Loudon, TN); Walker, William A. (Knoxville, TN)

1993-01-01T23:59:59.000Z

16

Rotor walks on general trees  

E-Print Network (OSTI)

The rotor walk on a graph is a deterministic analogue of random walk. Each vertex is equipped with a rotor, which routes the walker to the neighbouring vertices in a fixed cyclic order on successive visits. We consider rotor walk on an infinite rooted tree, restarted from the root after each escape to infinity. We prove that the limiting proportion of escapes to infinity equals the escape probability for random walk, provided only finitely many rotors send the walker initially towards the root. For i.i.d. random initial rotor directions on a regular tree, the limiting proportion of escapes is either zero or the random walk escape probability, and undergoes a discontinuous phase transition between the two as the distribution is varied. In the critical case there are no escapes, but the walker's maximum distance from the root grows doubly exponentially with the number of visits to the root. We also prove that there exist trees of bounded degree for which the proportion of escapes eventually exceeds the escape p...

Angel, Omer

2010-01-01T23:59:59.000Z

17

Probabilistic analysis of meanline compressor rotor performance  

E-Print Network (OSTI)

This thesis addresses variability in aerodynamic performance of a compressor rotor due to geometric variation. The performance of the rotor is computed using a meanline model that includes the effect of tip clearance ...

Fitzgerald, Nathan Andrew, 1980-

2004-01-01T23:59:59.000Z

18

The Influence of Inversions on Rotors  

Science Conference Proceedings (OSTI)

Rotors are small-scale circulations about a horizontal or quasi-horizontal axis that usually form in conjunction with high-amplitude mountain waves. The moderate to severe turbulence often found within rotors is a hazard to aviation. Observations ...

Rolf F. Hertenstein

2009-01-01T23:59:59.000Z

19

The Terrain-Induced Rotor Experiment  

Science Conference Proceedings (OSTI)

The Terrain-Induced Rotor Experiment (T-REX) is a coordinated international project, composed of an observational field campaign and a research program, focused on the investigation of atmospheric rotors and closely related phenomena in complex ...

Vanda Grubiši?; James D. Doyle; Joachim Kuettner; Richard Dirks; Stephen A. Cohn; Laura L. Pan; Stephen Mobbs; Ronald B. Smith; C. David Whiteman; Stanley Czyzyk; Simon Vosper; Martin Weissmann; Samuel Haimov; Stephan F. J. De Wekker; Fotini Katopodes Chow

2008-10-01T23:59:59.000Z

20

Rotor for centrifugal fast analyzers  

DOE Patents (OSTI)

The invention is an improved photometric analyzer of the rotary cuvette type, the analyzer incorporating a multicuvette rotor of novel design. The rotor (a) is leaktight, (b) permits operation in the 90/sup 0/ and 180/sup 0/ excitation modes, (c) is compatible with extensively used Centrifugal Fast Analyzers, and (d) can be used thousands of times. The rotor includes an assembly comprising a top plate, a bottom plate, and a central plate, the rim of the central plate being formed with circumferentially spaced indentations. A uv-transmitting ring is sealably affixed to the indented rim to define with the indentations an array of cuvettes. The ring serves both as a sealing means and an end window for the cuvettes.

Lee, N.E.

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Rotor for centrifugal fast analyzers  

DOE Patents (OSTI)

The invention is an improved photometric analyzer of the rotary cuvette type, the analyzer incorporating a multicuvette rotor of novel design. The rotor (a) is leaktight, (b) permits operation in the 90.degree. and 180.degree. excitation modes, (c) is compatible with extensively used Centrifugal Fast Analyzers, and (d) can be used thousands of times. The rotor includes an assembly comprising a top plate, a bottom plate, and a central plate, the rim of the central plate being formed with circumferentially spaced indentations. A UV-transmitting ring is sealably affixed to the indented rim to define with the indentations an array of cuvettes. The ring serves both as a sealing means and an end window for the cuvettes.

Lee, Norman E. (Knoxville, TN)

1985-01-01T23:59:59.000Z

22

Turbomachine rotor with improved cooling  

DOE Patents (OSTI)

A gas turbine rotor has an essentially closed loop cooling air scheme in which cooling air drawn from the compressor discharge air that is supplied to the combustion chamber is further compressed, cooled, and then directed to the aft end of the turbine rotor. Downstream seal rings attached to the downstream face of each rotor disc direct the cooling air over the downstream disc face, thereby cooling it, and then to cooling air passages formed in the rotating blades. Upstream seal rings attached to the upstream face of each disc direct the heated cooling air away from the blade root while keeping the disc thermally isolated from the heated cooling air. From each upstream seal ring, the heated cooling air flows through passages in the upstream discs and is then combined and returned to the combustion chamber from which it was drawn. 5 figs.

Hultgren, K.G.; McLaurin, L.D.; Bertsch, O.L.; Lowe, P.E.

1998-05-26T23:59:59.000Z

23

Turbomachine rotor with improved cooling  

SciTech Connect

A gas turbine rotor has an essentially closed loop cooling air scheme in which cooling air drawn from the compressor discharge air that is supplied to the combustion chamber is further compressed, cooled, and then directed to the aft end of the turbine rotor. Downstream seal rings attached to the downstream face of each rotor disc direct the cooling air over the downstream disc face, thereby cooling it, and then to cooling air passages formed in the rotating blades. Upstream seal rings attached to the upstream face of each disc direct the heated cooling air away from the blade root while keeping the disc thermally isolated from the heated cooling air. From each upstream seal ring, the heated cooling air flows through passages in the upstream discs and is then combined and returned to the combustion chamber from which it was drawn.

Hultgren, Kent Goran (Winter Park, FL); McLaurin, Leroy Dixon (Winter Springs, FL); Bertsch, Oran Leroy (Titusville, FL); Lowe, Perry Eugene (Oviedo, FL)

1998-01-01T23:59:59.000Z

24

The fractional symmetric rigid rotor  

E-Print Network (OSTI)

Based on the Riemann fractional derivative the Casimir operators and multipletts for the fractional extension of the rotation group SO(n) are calculated algebraically. The spectrum of the corresponding fractional symmetric rigid rotor is discussed. It is shown, that the rotational, vibrational and $\\gamma$-unstable limits of the standard geometric collective models are particular limits of this spectrum. A comparison with the ground state band spectra of nuclei shows an agreement with experimental data better than 2%. The derived results indicate, that the fractional symmetric rigid rotor is an appropriate tool for a description of low energy nuclear excitations.

Richard Herrmann

2006-10-24T23:59:59.000Z

25

Dielectric anomaly in coupled rotor systems  

E-Print Network (OSTI)

The correlated dynamics of coupled quantum rotors carrying electric dipole moment is theoretically investigated. The energy spectra of coupled rotors as a function of dipolar interaction energy is analytically solved. The calculated dielectric susceptibilities of the system show the peculiar temperature dependence different from that of isolated rotors.

Hiroyuki Shima; Tsuneyoshi Nakayama

2004-07-02T23:59:59.000Z

26

Filter type rotor for multistation photometer  

DOE Patents (OSTI)

A filter type rotor for a multistation photometer is provided. The rotor design combines the principle of cross-flow filtration with centrifugal sedimentation so that these occur simultaneously as a first stage of processing for suspension type fluids in an analytical type instrument. The rotor is particularly useful in whole-blood analysis.

Shumate, II, Starling E. (Knoxville, TN)

1977-07-12T23:59:59.000Z

27

Radial-Radial Single Rotor Turbine  

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

Radial-Radial Single Rotor Turbine Radial-Radial Single Rotor Turbine Radial-Radial Single Rotor Turbine A rotor for use in turbine applications. Available for thumbnail of Feynman Center (505) 665-9090 Email Radial-Radial Single Rotor Turbine A rotor for use in turbine applications has a radial compressor/pump having radially disposed spaced apart fins forming passages and a radial turbine having hollow turbine blades interleaved with the fins and through which fluid from the radial compressor/pump flows. The rotor can, in some applications, be used to produce electrical power. U.S. Patent No.: 7,044,718 (DOE S-100,626) Patent Application Filing Date: July 8, 2003 Patent Issue Date: May 16, 2006 Licensing Status: Available for Express Licensing (?). View terms and a sample license agreement.

28

Rotor walks and Markov chains  

E-Print Network (OSTI)

The rotor walk is a derandomized version of the random walk on a graph. On successive visits to any given vertex, the walker is routed to each of the neighboring vertices in some fixed cyclic order, rather than to a random sequence of neighbors. The concept generalizes naturally to countable Markov chains. Subject to general conditions, we prove that many natural quantities associated with the rotor walk (including normalized hitting frequencies, hitting times and occupation frequencies) concentrate around their expected values for the random walk. Furthermore, the concentration is stronger than that associated with repeated runs of the random walk; the discrepancy is at most C/n after n runs (for an explicit constant C), rather than c / ? n. 1

Alexander E. Holroyd; James Propp

2010-01-01T23:59:59.000Z

29

Rotor Walks and Markov Chains  

E-Print Network (OSTI)

The rotor walk is a derandomized version of the random walk on a graph. On successive visits to any given vertex, the walker is routed to each of the neighboring vertices in some fixed cyclic order, rather than to a random sequence of neighbors. The concept generalizes naturally to Markov chains on a countable state space. Subject to general conditions, we prove that many natural quantities associated with the rotor walk (including normalized hitting frequencies, hitting times and occupation frequencies) concentrate around their expected values for the random walk. Furthermore, the concentration is stronger than that associated with repeated runs of the random walk, with discrepancy at most C/n after n runs (for an explicit constant C), rather than constant/sqrt n.

Holroyd, Alexander E

2009-01-01T23:59:59.000Z

30

Rotor blades for turbine engines  

DOE Patents (OSTI)

A tip shroud that includes a plurality of damping fins, each damping fin including a substantially non-radially-aligned surface that is configured to make contact with a tip shroud of a neighboring rotor blade. At least one damping fin may include a leading edge damping fin and at least one damping fin may include a trailing edge damping fin. The leading edge damping fin may be configured to correspond to the trailing edge damping fin.

Piersall, Matthew R; Potter, Brian D

2013-02-12T23:59:59.000Z

31

A Note on Rotor-Router Aggregation on the Comb  

E-Print Network (OSTI)

We prove a shape theorem for rotor-router aggregation on the comb, for a specific initial rotor configuration and clockwise rotor sequence for all vertices. Furthermore, as an application of rotor-router walks, we describe the harmonic measure for the limiting shape of rotor-router aggregation, which is useful in the study of other growth models on the comb.

Huss, Wilfried

2011-01-01T23:59:59.000Z

32

Gas Turbine Rotor Life: Material Testing  

Science Conference Proceedings (OSTI)

Gas turbine rotor materials are subject to degradation from prolonged hours and multiple start/stop cycles of operation. Periodically, plant operators disassemble the compressor and turbine sections of the rotor system and inspect the components for signs of creep, embrittlement, corrosion, thermal fatigue, and high- and low-cycle fatigue. Beyond limited rotor inspections performed during hot gas path inspections and major overhauls, a more thorough inspection is often required by the equipment ...

2012-12-14T23:59:59.000Z

33

Gas Turbine Rotor Life Assessment Guideline  

Science Conference Proceedings (OSTI)

Gas turbine rotor materials are subject to degradation from prolonged hours and multiple start/stop cycles of operation. Periodically, plant operators disassemble the compressor and turbine sections of the rotor system and inspect the components for signs of creep, embrittlement, corrosion, thermal fatigue, and high- and low-cycle fatigue. Beyond limited rotor inspections performed during hot gas path inspections and major overhauls, a more thorough inspection is often required by the equipment manufactu...

2011-12-14T23:59:59.000Z

34

Design of plywood and paper flywheel rotors  

SciTech Connect

Technical and economic design factors of cellulosic rotors are compared with conventional materials for stationaly flywheel energy storage systems. Wood species, operation in a vacuum, assembly and costs of plywood rotors are evaluated. Wound kraft paper, twine and veneer rotors are examined. Plywood moisture equilibration during manufacture and assembly is critical. Disk shaping and rotor assembly are described. Potential self-centering dynamic balancing methods and equipment are described. High resolution tensile tests were performed while monitoring the acoustic emissions. Reasonable correlations exist between the instantaneous sample stiffness during the test and the accumulated acoustic energy released in fracture of the sample. They indicate promise for short term monitoring of damage during tensile tests. Preliminary duration of load tests were performed on vacuum dried hexagonal Birch plywood. Dynamic and static rotor-hub fatigue equipment were designed. Moisture loss rates while vacuum drying plywood cylinders were measured, and the radial and axial diffusion coefficients were evaluated. Diffusion coefficients of epoxy coated plywood cylinders were also obtained. Economics of cellulosic and conventional rotors were examined. Plywood rotor manufacturing costs were evaluated. The optimum economic shape for laminated rotors is shown to be cylindrical. Vacuum container costs are parametrically derived and based on material properties and costs. Containment costs are significant and are included in comparisons. The optimum design stress and wound rotor configuration are calculated for 17 examples. Plywood rotors appear to be marginally competitive with steel hose wire or E-glass rotors. High performance oriented draft paper rotors potentially provide the lowest energy storage costs in stationary systems.

Hagen, D.L.

1982-01-01T23:59:59.000Z

35

Negative Sequence Effects on Generator Rotors  

Science Conference Proceedings (OSTI)

Main generator rotors are constructed and designed to provide decades of reliable and trouble-free operation. However, a number of negative sequence and motoring incidences have occurred over the years that can adversely impact reliable operation of generator rotors and, ultimately, production of electrical power. Severe overheating leads to rotor material changes, such as steel hardness, and may if not detected, ultimately lead to catastrophic failure. This report discusses the effects of severe negativ...

2007-12-18T23:59:59.000Z

36

Optical Control of a Quantum Rotor  

E-Print Network (OSTI)

The possibility to coherently control a quantum rotor is investigated theoretically. The rotor is realized by an antiferromagnetic spin-1 Bose-Einstein condensate, trapped in the optical field of a Fabry-Perot resonator. By tuning the pumping field of the resonator, coherent control over the rotor is achieved. The technique is illustrated by the numerical simulation of a protocol that transforms the rotor's ground state into a squeezed state. The detection of the squeezed state via measurement of intensity-correlations of the cavity field is proposed.

Lukas F. Buchmann; H. Jing; C. Raman; P. Meystre

2013-03-04T23:59:59.000Z

37

Rotor interaction in the annulus billiard  

E-Print Network (OSTI)

Introducing the rotor interaction in the integrable system of the annulus billiard produces a variety of dynamical phenomena, from integrability to ergodicity.

Péter Bálint; Serge Troubetzkoy

2004-01-16T23:59:59.000Z

38

BISTABLE DEVICES FOR MORPHING ROTOR BLADES.  

E-Print Network (OSTI)

??This dissertation presents two bistable concepts for morphing rotor blades. These concepts are simple and are composed of bistable devices that act as coupling structures… (more)

Johnson, Terrence

2010-01-01T23:59:59.000Z

39

On the Optimization of Composite Flywheel Rotors.  

E-Print Network (OSTI)

??Energy storing flywheel rotor technology has yet to be fully optimized given the design possibilities. There have been many design approaches that have been published… (more)

Ross, Jacob

2013-01-01T23:59:59.000Z

40

The Intense Lee-Wave Rotor Event of Sierra Rotors IOP 8  

Science Conference Proceedings (OSTI)

A large-amplitude lee-wave rotor event observationally documented during Sierra Rotors Project Intensive Observing Period (IOP) 8 on 24–26 March 2004 in the lee of the southern Sierra Nevada is examined. Mountain waves and rotors occurred over ...

Vanda Grubiši?; Brian J. Billings

2007-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Method for manufacturing a rotor having superconducting coils  

DOE Patents (OSTI)

A method and apparatus for manufacturing a rotor for use with a rotating machine is provided that employs a superconducting coil on the rotor. An adhesive is applied to an outer surface of the rotor body, which may include a groove disposed within an outer surface of the rotor body. A superconducting coil is then mounted onto the rotor body such that the adhesive bonds the superconducting coil to the rotor body.

Driscoll, David I. (South Euclid, OH); Shoykhet, Boris A. (Beachwood, OH)

2001-01-01T23:59:59.000Z

42

Steam Turbine Rotor Life Assessment and Extension: Evaluation of Retired Rotors: Volume 2: Mechanical Properties of Service-Exposed Rotors  

Science Conference Proceedings (OSTI)

Informed run/retire decisions on high and intermediate pressure (HP/IP) rotors require mechanical property data on service-exposed material. This report presents a comprehensive set of mechanical property data, including creep and creep-fatigue crack growth, on a 1950 vintage CrMoV HP/IP rotor retired after more than 160,000 hours of service.

1994-04-01T23:59:59.000Z

43

Extension-Twist Coupling Optimization in Composite Rotor Blades .  

E-Print Network (OSTI)

??For optimal rotor performance in a tiltrotor aircraft the difference in the inflow and the rotor speeds between the hover and cruise flight modes suggests… (more)

Ozbay, Serkan

2005-01-01T23:59:59.000Z

44

Signature splitting in $^{173}$W with triaxial particle rotor model  

E-Print Network (OSTI)

A particle rotor model with a quasi-neutron coupled with a triaxially deformed rotor is applied to study signature splitting for bands with intruder orbital $\

B. Qi; S. Q. Zhang; S. Y. Wang; J. Meng

2008-06-15T23:59:59.000Z

45

Signature splitting in $^{173}$W with triaxial particle rotor model  

E-Print Network (OSTI)

A particle rotor model with a quasi-neutron coupled with a triaxially deformed rotor is applied to study signature splitting for bands with intruder orbital $\

Qi, B; Wang, S Y; Meng, J

2008-01-01T23:59:59.000Z

46

Multiple piece turbine rotor blade  

DOE Patents (OSTI)

A multiple piece turbine rotor blade with a shell having an airfoil shape and secured between a spar and a platform with the spar including a tip end piece. a snap ring fits around the spar and abuts against the spar tip end piece on a top side and abuts against a shell on the bottom side so that the centrifugal loads from the shell is passed through the snap ring and into the spar and not through a tip cap dovetail slot and projection structure.

Jones, Russell B; Fedock, John A

2013-05-21T23:59:59.000Z

47

Radial-radial single rotor turbine  

SciTech Connect

A rotor for use in turbine applications has a radial compressor/pump having radially disposed spaced apart fins forming passages and a radial turbine having hollow turbine blades interleaved with the fins and through which fluid from the radial compressor/pump flows. The rotor can, in some applications, be used to produce electrical power.

Platts, David A. (Los Alamos, NM)

2006-05-16T23:59:59.000Z

48

Substantially parallel flux uncluttered rotor machines  

Science Conference Proceedings (OSTI)

A permanent magnet-less and brushless synchronous system includes a stator that generates a magnetic rotating field when sourced by polyphase alternating currents. An uncluttered rotor is positioned within the magnetic rotating field and is spaced apart from the stator. An excitation core is spaced apart from the stator and the uncluttered rotor and magnetically couples the uncluttered rotor. The brushless excitation source generates a magnet torque by inducing magnetic poles near an outer peripheral surface of the uncluttered rotor, and the stator currents also generate a reluctance torque by a reaction of the difference between the direct and quadrature magnetic paths of the uncluttered rotor. The system can be used either as a motor or a generator

Hsu, John S.

2012-12-11T23:59:59.000Z

49

Flywheel rotor and containment technology development  

DOE Green Energy (OSTI)

The goals of the project are: to develop an economical and practical composite flywheel having an energy density of 88 Wh/kg at failure, an operational energy density of 44 to 55 Wh/kg, and an energy storage capacity of approximately 1 kWh; to determine the suitability of various manufacturing processes for low-cost rotor fabrication; to investigate flywheel and flywheel-systems dynamics; to test and evaluate prototype rotors for use in transportation and stationary applications; and to develop a fail-safe, lightweight, and low-cost flywheel containment. The following tasks have been accomplished: evaluation and selection of 1-kWh, first-generation, advanced flywheel rotor designs for subsequent development towards the DOE-established energy density goal of 88 Wh/kg at burst; completion of an advanced design concept for a flywheel primary containment structure, capable of containing the failure of a 1-kWh flywheel rotor and targeted for vehicular applications; non-destructive inspection and burst testing of approximately twenty (20) prototype rotors, and initiation of cyclic testing; completion of various activities in the areas of rotor manufacturing processes, dynamic analyses and composite materials design data generation; and initiation of an economic feasibility study to establish a rational costing methodology for composite rotors and containment.

Kulkarni, S.V.

1981-08-11T23:59:59.000Z

50

A reduced Blade-Vortex Interaction rotor  

E-Print Network (OSTI)

This research work aims at mapping the BVI azimuthal locations using a model rotor. A model rotor was first developed. An experimental investigation was then carried out to determine the possible BVI locations. The results of the mapping are presented. A qualitative discussion about the nature of the pressure signals obtained is presented. An attempt is made to reduce the BVI strengths using an innovative blade tip device. The results for the rotor with the tip device installed are compared with the results obtained without the tip device installed. The comparisons show the tip device to be fairly effective in reducing the strength of the BVI.

Mani, Somnath

1996-01-01T23:59:59.000Z

51

Antiferromagnetic spinor condensates are quantum rotors  

Science Conference Proceedings (OSTI)

We establish a theoretical correspondence between spin-one antiferromagnetic spinor condensates in an external magnetic field and quantum rotor models in an external potential. We show that the rotor model provides a conceptually clear picture of the possible phases and dynamical regimes of the antiferromagnetic condensate. We also show that this mapping simplifies calculations of the condensate's spectrum and wave functions. We use the rotor mapping to describe the different dynamical regimes recently observed in {sup 23}Na condensates [Phys. Rev. Lett. 102, 125301 (2009); Phys. Rev. Lett. 102, 225301 (2009)]. We also suggest a way to experimentally observe quantum-mechanical effects (collapse and revival) in spinor condensates.

Barnett, Ryan; Sau, Jay D.; Das Sarma, S. [Joint Quantum Institute and Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742-4111 (United States)

2010-09-15T23:59:59.000Z

52

Rotor apparatus for high strength undiffused brushless ...  

A radial gap brushless electric machine (30) having a stator (31) and a rotor (32) and a main air gap (34) also has at least one stationary excitation coil (35a, 36a ...

53

Wind turbine rotor hub and teeter joint  

DOE Patents (OSTI)

A rotor hub is provided for coupling a wind turbine rotor blade and a shaft. The hub has a yoke with a body which is connected to the shaft, and extension portions which are connected to teeter bearing blocks, each of which has an aperture. The blocks are connected to a saddle which envelops the rotor blade by one or two shafts which pass through the apertures in the bearing blocks. The saddle and blade are separated by a rubber interface which provides for distribution of stress over a larger portion of the blade. Two teeter control mechanisms, which may include hydraulic pistons and springs, are connected to the rotor blade and to the yoke at extension portions. These control mechanisms provide end-of-stroke damping, braking, and stiffness based on the teeter angle and speed of the blade.

Coleman, Clint (Warren, VT); Kurth, William T. (Warren, VT); Jankowski, Joseph (Stowe, VT)

1994-10-11T23:59:59.000Z

54

Interlayer toughening of fiber composite flywheel rotors  

DOE Patents (OSTI)

An interlayer toughening mechanism is described to mitigate the growth of damage in fiber composite flywheel rotors for long application. The interlayer toughening mechanism may comprise one or more tough layers composed of high-elongation fibers, high-strength fibers arranged in a woven pattern at a range from 0{degree} to 90{degree} to the rotor axis and bound by a ductile matrix material which adheres to and is compatible with the materials used for the bulk of the rotor. The number and spacing of the tough interlayers is a function of the design requirements and expected lifetime of the rotor. The mechanism has particular application in uninterruptable power supplies, electrical power grid reservoirs, and compulsators for electric guns, as well as electromechanical batteries for vehicles. 2 figs.

Groves, S.E.; Deteresa, S.J.

1998-07-14T23:59:59.000Z

55

Interlayer toughening of fiber composite flywheel rotors  

DOE Patents (OSTI)

An interlayer toughening mechanism to mitigate the growth of damage in fiber composite flywheel rotors for long application. The interlayer toughening mechanism may comprise one or more tough layers composed of high-elongation fibers, high-strength fibers arranged in a woven pattern at a range from 0.degree. to 90.degree. to the rotor axis and bound by a ductile matrix material which adheres to and is compatible with the materials used for the bulk of the rotor. The number and spacing of the tough interlayers is a function of the design requirements and expected lifetime of the rotor. The mechanism has particular application in uninterruptable power supplies, electrical power grid reservoirs, and compulsators for electric guns, as well as electromechanical batteries for vehicles.

Groves, Scott E. (Brentwood, CA); Deteresa, Steven J. (Livermore, CA)

1998-01-01T23:59:59.000Z

56

A carbon nanotube bearing and Stodola rotor  

E-Print Network (OSTI)

A nano-scale rotor supported on a cantilevered multi-wall carbon nanotube (MWNT) shaft (Stodola configuration) is proposed. The nanotube is also expected to function as the bearing, since individual walls of a MWNT are not ...

Cook, Eugene Hightower

2008-01-01T23:59:59.000Z

57

Voith High Efficiency HM Rotor Energy Data, A Repulper Rotor Design Case Study  

E-Print Network (OSTI)

A recently completed demonstration project, funded partly by the Wisconsin Focus on Energy program and Wisconsin Public Service Corporation, shows the effectiveness of an energy efficient repulper rotor design compared with that of a conventional rotor. We conducted a demonstration to measure the performance and energy consumption of the energy efficient virgin pulp repulper of Wausau Paper in Rhinelander, Wisconsin. This paper describes the demonstration setting, shows the analysis, and discusses the results. Careful monitoring of the batch repulping operation gave us a very good picture of the energy savings. We monitored the energy use and impact on pulp quality under the following three conditions: 1. The existing conventional repulping blade (HOG rotor) 2. A new conventional repulping blade of the same style (spare HOG rotor) 3. A new energy efficient repulping blade (HM rotor) The HM rotor, a tall, swept-back blade design, has been engineered to provide effective turbulence of the fiber suspension and maximum rotor-fiber contact while consuming low horsepower.

Aue, J.; Fineran, B.

2005-01-01T23:59:59.000Z

58

MHK Technologies/Wave Rotor | Open Energy Information  

Open Energy Info (EERE)

Rotor Rotor < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Wave Rotor.jpg Technology Profile Primary Organization Ecofys Subsidiary of Econcern Project(s) where this technology is utilized *MHK Projects/C Energy Technology Resource Click here Wave Technology Type Click here Axial Flow Turbine Technology Readiness Level Click here TRL 5/6: System Integration and Technology Laboratory Demonstration Technology Description The Wave Rotor uses a combined Darrieus-Wells rotor, which is contained on the same vertical axis of rotation. These are respectively omni- and bi-directional rotors that can operate in currents of changing directions. The Wave Rotor is mounted on a platform to allow for the capture of wave energy from circulating water particles created by local currents. Since it uses two types of rotor on a single axis of rotation it is able to convert not only tidal currents, but also waves into electricity.

59

PN Rotor GmbH | Open Energy Information  

Open Energy Info (EERE)

PN Rotor GmbH Jump to: navigation, search Name PN Rotor GmbH Place Lower Saxony, Germany Sector Wind energy Product Germany-based subsidiary of Prokon Nord Energiesysteme GmbH and...

60

Wind turbine rotor hub and teeter joint - Energy Innovation Portal  

A rotor hub is provided for coupling a wind turbine rotor blade and a shaft. The hub has a yoke with a body which is connected to the shaft, and extension portions ...

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Evaluation of Temper Embrittlement in Turbine Rotor Material  

Science Conference Proceedings (OSTI)

To assess the integrity of in-service steam turbine rotors, utilities need to know their current toughness. This report presents a procedure for nondestructively estimating toughness on the basis of the chemical composition of the rotor steel.

1991-03-01T23:59:59.000Z

62

The cost of noise reduction in commercial tilt rotor aircraft  

E-Print Network (OSTI)

The relationship between direct operating cost and departure noise annoyance was developed for commercial tilt rotor aircraft. This was accomplished by generating a series of tilt rotor aircraft designs to meet various ...

Faulkner, Henry B.

1974-01-01T23:59:59.000Z

63

Rotor Design and Process Optimization for Rotary Inert Dgeasser  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, Materials Science & Technology 2012. Symposium, Advances in Metal Casting Technologies. Presentation Title, Rotor Design and ...

64

Encoding many qubits in a rotor  

Science Conference Proceedings (OSTI)

We propose a scheme for encoding many qubits in a single rotor, that is, a continuous and periodic degree of freedom. A key feature of this scheme is its ability to manipulate and entangle the encoded qubits with a single operation on the system. We also show, using quantum error-correcting codes, how to protect the qubits against small errors in angular position and momentum which may affect the rotor. We then discuss the feasibility of this scheme and suggest several candidates for its implementation. The proposed scheme is immediately generalizable to qudits of any finite dimension.

Raynal, Philippe; Kalev, Amir [Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, 117543 (Singapore); Suzuki, Jun [National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo, 101-8430 (Japan); Englert, Berthold-Georg [Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, 117543 (Singapore); Department of Physics, National University of Singapore, 2 Science Drive 3, 117542 (Singapore)

2010-05-15T23:59:59.000Z

65

Encoding many qubits in a rotor  

E-Print Network (OSTI)

We propose a scheme for encoding many qubits in a single rotor, that is, a continuous and periodic degree of freedom. A key feature of this scheme is its ability to manipulate and entangle the encoded qubits with a single operation on the system. We also show, using quantum error-correcting codes, how to protect the qubits against small errors in angular position and momentum which may affect the rotor. We then discuss the feasibility of this scheme and suggest several candidates for its implementation. The proposed scheme is immediately generalizable to qudits of any finite dimension.

Kalev, Amir; Suzuki, Jun; Englert, Berthold-Georg

2010-01-01T23:59:59.000Z

66

Kicked rotor quantum resonances in position space  

E-Print Network (OSTI)

We present an approach of the kicked rotor quantum resonances in position-space, based on its analogy with the optical Talbot effect. This approach leads to a very simple picture of the physical mechanism underlying the dynamics and to analytical expressions for relevant physical quantities, such as mean momentum or kinetic energy. The ballistic behavior, which is closely associated to quantum resonances, is analyzed and shown to emerge from a coherent adding of successive kicks applied to the rotor thanks to a periodic reconstruction of the spatial wavepacket.

Maxence Lepers; Véronique Zehnlé; Jean Claude Garreau

2007-11-11T23:59:59.000Z

67

Kicked rotor quantum resonances in position space  

E-Print Network (OSTI)

We present an approach of the kicked rotor quantum resonances in position-space, based on its analogy with the optical Talbot effect. This approach leads to a very simple picture of the physical mechanism underlying the dynamics and to analytical expressions for relevant physical quantities, such as mean momentum or kinetic energy. The ballistic behavior, which is closely associated to quantum resonances, is analyzed and shown to emerge from a coherent adding of successive kicks applied to the rotor thanks to a periodic reconstruction of the spatial wavepacket.

Lepers, Maxence; Garreau, Jean Claude

2007-01-01T23:59:59.000Z

68

Encoding many qubits in a rotor  

E-Print Network (OSTI)

We propose a scheme for encoding many qubits in a single rotor, that is, a continuous and periodic degree of freedom. A key feature of this scheme is its ability to manipulate and entangle the encoded qubits with a single operation on the system. We also show, using quantum error-correcting codes, how to protect the qubits against small errors in angular position and momentum which may affect the rotor. We then discuss the feasibility of this scheme and suggest several candidates for its implementation. The proposed scheme is immediately generalizable to qudits of any finite dimension.

Amir Kalev; Philippe Raynal; Jun Suzuki; Berthold-Georg Englert

2010-03-05T23:59:59.000Z

69

Accelerator dynamics of a fractional kicked rotor  

E-Print Network (OSTI)

It is shown that the Weyl fractional derivative can quantize an open system. A fractional kicked rotor is studied in the framework of the fractional Schrodinger equation. The system is described by the non-Hermitian Hamiltonian by virtue of the Weyl fractional derivative. Violation of space symmetry leads to acceleration of the orbital momentum. Quantum localization saturates this acceleration, such that the average value of the orbital momentum can be a direct current and the system behaves like a ratchet. The classical counterpart is a nonlinear kicked rotor with absorbing boundary conditions.

A. Iomin

2006-09-14T23:59:59.000Z

70

On the Classification of Universal Rotor-Routers  

E-Print Network (OSTI)

The combinatorial theory of rotor-routers has connections with problems of statistical mechanics, graph theory, chaos theory, and computer science. A rotor-router network defines a deterministic walk on a digraph G in which a particle walks from a source vertex until it reaches one of several target vertices. Motivated by recent results due to Giacaglia et al., we study rotor-router networks in which all non-target vertices have the same type. A rotor type r is universal if every hitting sequence can be achieved by a homogeneous rotor-router network consisting entirely of rotors of type r. We give a conjecture that completely classifies universal rotor types. Then, this problem is simplified by a theorem we call the Reduction Theorem that allows us to consider only two-state rotors. A rotor-router network called the compressor, because it tends to shorten rotor periods, is introduced along with an associated algorithm that determines the universality of almost all rotors. New rotor classes, including boppy ro...

He, Xiaoyu

2011-01-01T23:59:59.000Z

71

A Recurrent Rotor-Router Configuration in Z^3  

E-Print Network (OSTI)

Rotor Router models were first introduced by James Propp in 2002. A recurrent Rotor configuration is the one in which every state is visited infinitely often. In this project we investigated whether there is a recurrent Rotor configuration in Z^d (d>2).

A, Tulasi Ram Reddy

2010-01-01T23:59:59.000Z

72

Design of plywood and paper flywheel rotors. Final report  

SciTech Connect

Technical and economic design factors of cellulosic rotors are compared with conventional materials for stationary flywheel energy storage systems. Wood species, operation in a vacuum, assembly and costs of rotors are evaluated. Wound kraft paper, twine and plywood rotors are examined. Two hub attachments are designed. Support stiffness is shown to be constrained by the material strength, rotor configuration and speed ratio. Preliminary duration of load tests was performed on vacuum dried hexagonal birch plywood. Dynamic and static rotor-hub fatigue equipment is designed. Moisture loss rates while vacuum drying plywood cylinders were measured, and the radial and axial diffusion coefficients were evaluated. Diffusion coefficients of epoxy coated plywood cylinders were also obtained. Economics of cellulosic and conventional rotors were examined. Plywood rotor manufacturing costs were evaluated. The optimum economic shape for laminated rotors is shown to be cylindrical. Vacuum container costs are parametrically derived and based on material properties and costs. Containment costs are significant and are included in comparisons. The optimum design stress and wound rotor configuration are calculated for seventeen examples. Plywood rotors appear to be marginally competitive with the steel hose wire or E-glass rotors. High performance oriented kraft paper rotors potentially provide the lowest energy storage costs in stationary systems.

Erdman, A.G.; Hagen, D.L.; Gaff, S.A.

1982-05-01T23:59:59.000Z

73

Rotor bore and turbine rotor wheel/spacer heat exchange flow circuit  

SciTech Connect

In a turbine having closed-circuit steam-cooling passages about the rim of the rotor during steady-state operation, compressor discharge air is supplied to the rotor bore for passage radially outwardly into the wheel space cavities between the wheels and spacers. Communicating slots and channels in the spacers and wheels at circumferentially spaced positions enable egress of the compressor discharge air into the hot gas flow path. At turbine startup, cooling air flows through the closed-circuit steam passages to cool the outer rim of the rotor while compressor discharge air pre-warms the wheels and spacers. At steady-state, cooling steam is supplied in the closed-circuit steam-cooling passages and compressor discharge air is supplied through the bore and into the wheel space cavities to cool the rotor.

Caruso, Philip M. (Selkirk, NY); Eldrid, Sacheverel Quentin (Saratoga Springs, NY); Ladhani, Azad A. (Niskayuna, NY); DeMania, Alan Richard (Niskayuna, NY); Palmer, Gene David (Clifton Park, NY); Wilson, Ian David (Clifton Park, NY); Rathbun, Lisa Shirley (Scotia, NY); Akin, Robert Craig (Schenectady, NY)

2002-01-01T23:59:59.000Z

74

Quantum beats of the rigid rotor  

E-Print Network (OSTI)

The dynamics is investigated of a free particle on a sphere (rigid rotor or rotator) that is initially in a coherent state. The instability of coherent states with respect to the free evolution leads to nontrivial time-development of averages of observables representing the position of a particle on a sphere that can be interpreted as quantum beats.

K. Kowalski; J. Rembieli?ski

2013-09-23T23:59:59.000Z

75

The Evolution of Rotor and Blade Design  

DOE Green Energy (OSTI)

The objective of this paper is to provide a historical perspective of the evolution of rotor and blade design during the last 20 years. This evolution is a balanced integration of economic, aerodynamic, structural dynamic, noise, and aesthetic considerations, which are known to be machine type and size dependent.

Tangler, J.

2000-08-01T23:59:59.000Z

76

Cracked rotor vibrations by multifractal analysis  

E-Print Network (OSTI)

Multifractal analysis has been used to diagnoze cracked and healthy rotors. Is has been shown that the complexity and regularity criteria of the dynamical systems defined by the multiple scaling of the time series can indicate the damages of the rotating shaft.

Grzegorz Litak; Jerzy T. Sawicki

2008-04-15T23:59:59.000Z

77

Quantum beats of the rigid rotor  

E-Print Network (OSTI)

The dynamics is investigated of a free particle on a sphere (rigid rotor or rotator) that is initially in a coherent state. The instability of coherent states with respect to the free evolution leads to nontrivial time-development of averages of observables representing the position of a particle on a sphere that can be interpreted as quantum beats.

Kowalski, K

2013-01-01T23:59:59.000Z

78

Utilization of rotor kinetic energy storage for hybrid vehicles  

DOE Patents (OSTI)

A power system for a motor vehicle having an internal combustion engine, the power system comprises an electric machine (12) further comprising a first excitation source (47), a permanent magnet rotor (28) and a magnetic coupling rotor (26) spaced from the permanent magnet rotor and at least one second excitation source (43), the magnetic coupling rotor (26) also including a flywheel having an inertial mass to store kinetic energy during an initial acceleration to an operating speed; and wherein the first excitation source is electrically connected to the second excitation source for power cycling such that the flywheel rotor (26) exerts torque on the permanent magnet rotor (28) to assist braking and acceleration of the permanent magnet rotor (28) and consequently, the vehicle. An axial gap machine and a radial gap machine are disclosed and methods of the invention are also disclosed.

Hsu, John S. (Oak Ridge, TN)

2011-05-03T23:59:59.000Z

79

Closed continuous-flow centrifuge rotor  

DOE Patents (OSTI)

A blood separation centrifuge rotor having a generally parabolic core disposed concentrically and spaced apart within a housing having a similarly shaped cavity. Blood is introduced through a central inlet and into a central passageway enlarged downwardly to decrease the velocity of the entrant blood. Septa are disposed inside the central passageway to induce rotation of the entrant blood. A separation chamber is defined between the core and the housing wherein the whole blood is separated into red cell, white cell, and plasma zones. The zones are separated by annular splitter blades disposed within the separation chamber. The separated components are continuously removed through conduits communicating through a face seal to the outside of the rotor.

Breillatt, Jr., Julian P. (Oak Ridge, TN); Remenyik, Carl J. (Knoxville, TN); Sartory, Walter K. (Oak Ridge, TN); Thacker, Louis H. (Knoxville, TN); Penland, William Z. (Bethesda, MD)

1976-01-01T23:59:59.000Z

80

Negative Sequence Effects on Generator Rotors  

Science Conference Proceedings (OSTI)

This report is the second part of a study of the effects of severe negative sequence events on round rotor turbine generators. The first part (EPRI report 1014910) introduced simplified models to investigate the thermal and mechanical stresses resulting from unbalanced short circuits and other events. The current report provides documentation on these simplified models. It also describes further studies of the retaining ring and introduces additional models for the pole face and cross-slot regions.

2009-01-16T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Rotor assembly and method for automatically processing liquids  

DOE Patents (OSTI)

A rotor assembly for performing a relatively large number of processing steps upon a sample, such as a whole blood sample, and a diluent, such as water, includes a rotor body for rotation about an axis and including a network of chambers within which various processing steps are performed upon the sample and diluent and passageways through which the sample and diluent are transferred. A transfer mechanism is movable through the rotor body by the influence of a magnetic field generated adjacent the transfer mechanism and movable along the rotor body, and the assembly utilizes centrifugal force, a transfer of momentum and capillary action to perform any of a number of processing steps such as separation, aliquoting, transference, washing, reagent addition and mixing of the sample and diluent within the rotor body. The rotor body is particularly suitable for automatic immunoassay analyses.

Burtis, Carl A. (Oak Ridge, TN); Johnson, Wayne F. (Loudon, TN); Walker, William A. (Knoxville, TN)

1992-01-01T23:59:59.000Z

82

Double-ended ceramic helical-rotor expander  

DOE Patents (OSTI)

A ceramic helical rotor expander using a double-ended or tandem herringbone type rotor arrangement with bearing and seal assemblies remote from the hot gas inlets and especially capable of operating at an inlet temperature of above 1100.degree. C. The rotors are solid or hollow and bonded to hollow metal shafts, and mounted in a composite or simple prismatic casing. The rotors, casing and shafts are constructed from low expansivity materials. In the preferred embodiment the rotors are constructed of silicon nitride and the shafts constructed of an molybdenum alloy, with the metal shafts being supported in bearings and secured to synchronizing gears. The rotors and casing may be provided with coolant channels therein, and are constructed to eliminate the problem of end leakages at inlet temperature and pressure, and the need for high temperature bearings and seals.

Mohr, Peter B. (Livermore, CA); Myers, Wendell B. (Livermore, CA)

1995-01-01T23:59:59.000Z

83

Rotor assembly and method for automatically processing liquids  

DOE Patents (OSTI)

A rotor assembly is described for performing a relatively large number of processing steps upon a sample, such as a whole blood sample, and a diluent, such as water. It includes a rotor body for rotation about an axis and includes a network of chambers within which various processing steps are performed upon the sample and diluent and passageways through which the sample and diluent are transferred. A transfer mechanism is movable through the rotor body by the influence of a magnetic field generated adjacent the transfer mechanism and movable along the rotor body, and the assembly utilizes centrifugal force, a transfer of momentum and capillary action to perform any of a number of processing steps such as separation, aliquoting, transference, washing, reagent addition and mixing of the sample and diluent within the rotor body. The rotor body is particularly suitable for automatic immunoassay analyses. 34 figs.

Burtis, C.A.; Johnson, W.F.; Walker, W.A.

1992-12-22T23:59:59.000Z

84

Double-ended ceramic helical-rotor expander  

DOE Patents (OSTI)

A ceramic helical rotor expander is disclosed using a double-ended or tandem herringbone type rotor arrangement with bearing and seal assemblies remote from the hot gas inlets and especially capable of operating at an inlet temperature of above 1,100 C. The rotors are solid or hollow and bonded to hollow metal shafts, and mounted in a composite or simple prismatic casing. The rotors, casing and shafts are constructed from low expansivity materials. In the preferred embodiment the rotors are constructed of silicon nitride and the shafts constructed of an molybdenum alloy, with the metal shafts being supported in bearings and secured to synchronizing gears. The rotors and casing may be provided with coolant channels therein, and are constructed to eliminate the problem of end leakages at inlet temperature and pressure, and the need for high temperature bearings and seals. 3 figs.

Mohr, P.B.; Myers, W.B.

1995-02-28T23:59:59.000Z

85

Escape rates for rotor walks in Z d  

E-Print Network (OSTI)

Rotor walk is a deterministic analogue of random walk. We study its recurrence and transience properties on Z d for the initial configuration of all rotors aligned. If n particles in turn perform rotor walks starting from the origin, we show that the number that escape (i.e., never return to the origin) is of order n in dimensions d ? 3, and of order n / log n in dimension 2. 1

Laura Florescu; Shirshendu Ganguly; Lionel Levine; Yuval Peres

2013-01-01T23:59:59.000Z

86

Geometrical terms in the effective Hamiltonian for rotor molecules  

E-Print Network (OSTI)

An analogy between asymmetric rotor molecules and anisotropic cosmology can be used to calculate new centrifugal distortion terms in the effective potential of asymmetric rotor molecules which have no internal 3-fold symmetry. The torsional potential picks up extra $\\cos\\alpha$ and $\\cos2\\alpha$ contributions, which are comparable to corrections to the momentum terms in methanol and other rotor molecules with isotope replacements.

Moss, Ian G

2013-01-01T23:59:59.000Z

87

Rotor for processing liquids using movable capillary tubes  

DOE Patents (OSTI)

A rotor assembly for processing liquids, especially whole blood samples, is disclosed. The assembly includes apparatus for separating non-liquid components of whole blood samples from liquid components, apparatus for diluting the separated liquid component with a diluent and apparatus for transferring the diluted sample to an external apparatus for analysis. The rotor assembly employs several movable capillary tubes to handle the sample and diluents. A method for using the rotor assembly to process liquids is also described.

Johnson, Wayne F. (Loudon, TN); Burtis, Carl A. (Oak Ridge, TN); Walker, William A. (Knoxville, TN)

1989-05-30T23:59:59.000Z

88

Rotor for processing liquids using movable capillary tubes  

DOE Patents (OSTI)

A rotor assembly for processing liquids, especially whole blood samples, is disclosed. The assembly includes apparatus for separating non-liquid components of whole blood samples from liquid components, apparatus for diluting the separated liquid component with a diluent and apparatus for transferring the diluted sample to an external apparatus for analysis. The rotor assembly employs several movable capillary tubes to handle the sample and diluents. A method for using the rotor assembly to process liquids is also described. 5 figs.

Johnson, W.F.; Burtis, C.A.; Walker, W.A.

1987-07-17T23:59:59.000Z

89

Rotor for processing liquids using movable capillary tubes  

DOE Patents (OSTI)

A rotor assembly for processing liquids, especially whole blood samples, is disclosed. The assembly includes apparatus for separating non-liquid components of whole blood samples from liquid components, apparatus for diluting the separated liquid component with a diluent and apparatus for transferring the diluted sample to an external apparatus for analysis. The rotor assembly employs several movable capillary tubes to handle the sample and diluents. A method for using the rotor assembly to process liquids is also described.

Johnson, Wayne F. (Loudon, TN); Burtis, Carl A. (Oak Ridge, TN); Walker, William A. (Knoxville, TN)

1989-01-01T23:59:59.000Z

90

Geometrical terms in the effective Hamiltonian for rotor molecules  

E-Print Network (OSTI)

An analogy between asymmetric rotor molecules and anisotropic cosmology can be used to calculate new centrifugal distortion terms in the effective potential of asymmetric rotor molecules which have no internal 3-fold symmetry. The torsional potential picks up extra $\\cos\\alpha$ and $\\cos2\\alpha$ contributions, which are comparable to corrections to the momentum terms in methanol and other rotor molecules with isotope replacements.

Ian G. Moss

2013-03-25T23:59:59.000Z

91

Gas Turbine Rotor Life Evaluation: Siemens V84.2  

Science Conference Proceedings (OSTI)

Gas turbine rotor materials are subject to degradation from prolonged hours and multiple start/stop cycles of operation. Occasionally, plant operators have the compressor and turbine sections of the rotor system disassembled and the components inspected for signs of creep, embrittlement, corrosion, thermal fatigue, and high- and low-cycle fatigue. Inspections of rotor rim areas typically take place more regularly during hot gas path and major maintenance intervals when casings and blades are removed. Thi...

2011-11-10T23:59:59.000Z

92

Electrostatic generator/motor having rotors of varying ...  

Electrostatic generator/motor having rotors of varying thickness and a central stator electrically connected together into two groups United States Patent

93

Mechanical coupling for a rotor shaft assembly of dissimilar materials  

DOE Patents (OSTI)

A mechanical coupling for coupling a ceramic disc member to a metallic shaft includes a first wedge clamp and a second wedge clamp. A fastener engages a threaded end of a tie-bolt to sandwich the ceramic disc between the wedge clamps. An axial spring is positioned between the fastener and the second wedge clamp to apply an axial preload along the longitudinal axis. Another coupling utilizes a rotor shaft end of a metallic rotor shaft as one wedge clamp. Still another coupling includes a solid ceramic rotor disc with a multiple of tie-bolts radially displaced from the longitudinal axis to exert the preload on the solid ceramic rotor disc.

Shi, Jun (Glastonbury, CT); Bombara, David (New Hartford, CT); Green, Kevin E. (Broad Brook, CT); Bird, Connic (Rocky Hill, CT); Holowczak, John (South Windsor, CT)

2009-05-05T23:59:59.000Z

94

Quantum rotor theory of spinor condensates in tight traps  

Science Conference Proceedings (OSTI)

In this work, we theoretically construct exact mappings of many-particle bosonic systems onto quantum rotor models. In particular, we analyze the rotor representation of spinor Bose-Einstein condensates. In a previous work [R. Barnett et al., Phys. Rev. A 82, 031602(R) (2010)] it was shown that there is an exact mapping of a spin-one condensate of fixed particle number with quadratic Zeeman interaction onto a quantum rotor model. Since the rotor model has an unbounded spectrum from above, it has many more eigenstates than the original bosonic model. Here we show that for each subset of states with fixed spin F{sub z}, the physical rotor eigenstates are always those with the lowest energy. We classify three distinct physical limits of the rotor model: the Rabi, Josephson, and Fock regimes. The last regime corresponds to a fragmented condensate and is thus not captured by the Bogoliubov theory. We next consider the semiclassical limit of the rotor problem and make connections with the quantum wave functions through the use of the Husimi distribution function. Finally, we describe how to extend the analysis to higher-spin systems and derive a rotor model for the spin-two condensate. Theoretical details of the rotor mapping are also provided here.

Barnett, Ryan; Hui, Hoi-Yin; Lin, Chien-Hung; Sau, Jay D.; Das Sarma, S. [Joint Quantum Institute and Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742-4111 (United States)

2011-02-15T23:59:59.000Z

95

Flight Control Design for Rotorcraft with Variable Rotor Speed.  

E-Print Network (OSTI)

??Flight control design issues for rotorcraft with variable rotor speed are investigated, and new design methodologies are developed to deal with the challenges of variable… (more)

Guo, Wei

2009-01-01T23:59:59.000Z

96

Hawaii Zuteck Rotor Project: Compilation of project reports  

DOE Green Energy (OSTI)

Summarizes project to design and build aileron retrofit blades for a 600 kW upwind, teetered rotor, full-span pitch control, horizontal-axis wind turbine.

Zuteck, M.D.; Miller, M.W.

1999-02-25T23:59:59.000Z

97

Optimal propulsion system design for a micro quad rotor.  

E-Print Network (OSTI)

?? Currently a 50 gram micro quad rotor vehicle is being developed in collaboration with Daedalus Flight Systems. Optimization of the design at this scale… (more)

Harrington, Aaron M.

2011-01-01T23:59:59.000Z

98

Interface structure for hub and mass attachment in flywheel rotors  

DOE Patents (OSTI)

An interface structure is described for hub and mass attachment in flywheel rotors. The interface structure efficiently transmits high radial compression forces and withstands both large circumferential elongation and local stresses generated by mass-loading and hub attachments. The interface structure is comprised of high-strength fiber, such as glass and carbon, woven into an angle pattern which is about 45{degree} with respect to the rotor axis. The woven fiber is bonded by a ductile matrix material which is compatible with and adheres to the rotor material. This woven fiber is able to elongate in the circumferential direction to match the rotor growth during spinning. 2 figs.

Deteresa, S.J.; Groves, S.E.

1998-06-02T23:59:59.000Z

99

Interface structure for hub and mass attachment in flywheel rotors  

DOE Patents (OSTI)

An interface structure for hub and mass attachment in flywheel rotors. The interface structure efficiently transmits high radial compression forces and withstands both large circumferential elongation and local stresses generated by mass-loading and hub attachments. The interface structure is comprised of high-strength fiber, such as glass and carbon, woven into an angle pattern which is about 45.degree. with respect to the rotor axis. The woven fiber is bonded by a ductile matrix material which is compatible with and adheres to the rotor material. This woven fiber is able to elongate in the circumferential direction to match the rotor growth during spinning.

Deteresa, Steven J. (Livermore, CA); Groves, Scott E. (Brentwood, CA)

1998-06-02T23:59:59.000Z

100

Control of wind turbine output power via a variable rotor resistance.  

E-Print Network (OSTI)

??Many utility-scale wind turbine generators use wound-rotor induction machines. By adding an external rotor resistance to the rotor circuit it is possible to control the… (more)

Burnham, David James

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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.


101

Technical Basis for Generator Rotor Remaining Life Estimation Using Boresonic Inspection Data  

Science Conference Proceedings (OSTI)

Because they operate at much lower temperatures than turbine rotors, generator rotors do not experience the creep or thermal fatigue damage associated with turbine rotors. The major damage mechanism for generator rotors’ near-bore regions is low-cycle fatigue due to startups. However, current practices of generator boresonic inspection do not differentiate between generator rotors and turbine rotors. The current practices also have large variations, ranging from no boresonic inspection to ...

2012-12-12T23:59:59.000Z

102

A Numerical Study of Water Injection on Transonic Compressor Rotor Performance.  

E-Print Network (OSTI)

??In this study, numerical simulations of two-phase flow in a transonic compressor rotor (NASA Rotor 37) were performed. Both flow and droplets governing equations were… (more)

Szabo, Istvan

2008-01-01T23:59:59.000Z

103

AN INVESTIGATION OF PERFORMANCE BENEFITS AND TRIM REQUIREMENTS OF A VARIABLE SPEED HELICOPTER ROTOR.  

E-Print Network (OSTI)

??This study primarily examines the main rotor power reductions possible through variation in rotor RPM. Simulations were based on the UH-60 Blackhawk helicopter, and emphasis… (more)

Steiner, Jason

2008-01-01T23:59:59.000Z

104

Turbulence ingestion noise of open rotors  

E-Print Network (OSTI)

liners, which play a crucial role in specific tone reduction for turbofans, cannot of course be used to attenuate noise from these rotors. General Electric (GE) in the US began an in-house ‘UnDucted Fan’ (UDF) research programme in 1983 and also... ), has established ambitious targets for new aircraft entering service in 2020, compared to those entering service in 2000, of a 50% reduction in fuel consumption and CO2 emissions per passenger kilometre (of which 20%, that is just under half...

Robison, Rosalyn Aruna Venner

2012-04-10T23:59:59.000Z

105

Quantum diffusion in the quasiperiodic kicked rotor  

E-Print Network (OSTI)

We study the mechanisms responsible for quantum diffusion in the quasiperiodic kicked rotor. We report experimental measurements of the diffusion constant on the atomic version of the system and develop a theoretical approach (based on the Floquet theorem) explaining the observations, especially the ``sub-Fourier'' character of the resonances observed in the vicinity of exact periodicity, i.e. the ability of the system to distinguish two neighboring driving frequencies in a time shorter than the inverse of the difference of the two frequencies.

Hans Lignier; Jean Claude Garreau; Pascal Szriftgiser; Dominique Delande

2004-12-02T23:59:59.000Z

106

Steam Turbine Rotor Life Assessment: Volumes 1-5  

Science Conference Proceedings (OSTI)

To assess the integrity and residual life of an in-service steam turbine rotor, utilities need to know the rotor's current creep and/or fatigue damage. This series of reports presents procedures for non-destructively estimating this damage using hardness, replication, and X-ray based approaches.

1994-05-21T23:59:59.000Z

107

Intelligent acoustic rotor speed estimation for an autonomous helicopter  

Science Conference Proceedings (OSTI)

Acoustic sensing to gather information about a machine can be highly beneficial, but processing the data can be difficult. In this work, a variety of methodologies have been studied to extract rotor speed information from the sound signature of an autonomous ... Keywords: Acoustic sensing, Adaptive network-based fuzzy inference system, Artificial neural network, Feature selection, Genetic algorithm, Helicopter, Rotor speeds

Benjamin N. Passow; Mario A. Gongora; Adrian A. Hopgood; Sophy Smith

2012-11-01T23:59:59.000Z

108

Disc rotors with permanent magnets for brushless DC motor  

DOE Patents (OSTI)

A brushless dc permanent magnet motor drives an autonomous underwater vehe. In one embodiment, the motor comprises four substantially flat stators in stacked relationship, with pairs of the stators axially spaced, each of the stators comprising a tape-wound stator coil, and first and second substantially flat rotors disposed between the spaced pairs of stators. Each of the rotors includes an annular array of permanent magnets embedded therein. A first shaft is connected to the first rotor and a second, concentric shaft is connected to the second rotor, and a drive unit causes rotation of the two shafts in opposite directions. The second shaft comprises a hollow tube having a central bore in which the first shaft is disposed. Two different sets of bearings support the first and second shafts. In another embodiment, the motor comprises two ironless stators and pairs of rotors mounted on opposite sides of the stators and driven by counterrotating shafts.

Hawsey, Robert A. (Oak Ridge, TN); Bailey, J. Milton (Knoxville, TN)

1992-01-01T23:59:59.000Z

109

Local-to-global principles for rotor walk  

E-Print Network (OSTI)

In rotor walk on a finite directed graph, the exits from each vertex follow a prescribed periodic sequence. Here we consider the case of rotor walk where a particle starts from a designated source vertex and continues until it hits a designated target set, at which point the walk is restarted from the source. We show that the sequence of successively hit targets, which is easily seen to be eventually periodic, is in fact periodic. We show moreover that reversing the periodic patterns of all rotor sequences causes the periodic pattern of the hitting sequence to be reversed as well. The proofs involve a new notion of equivalence of rotor configurations, and an extension of rotor walk incorporating time-reversed particles.

Giacaglia, Giuliano Pezzolo; Propp, James; Zayas-Palmer, Linda

2011-01-01T23:59:59.000Z

110

Small-Scale Aeroelastic Rotor Simulation, Design and Fabrication  

E-Print Network (OSTI)

Efficient, small-scale fixed-pitch rotor blades are essential for miniature rotorcraft. Extremely thin blade sections are required for highly efficient rotor performance that leads to acceptable mission endurance. Such rotor blades are difficult to manufacture from sufficiently rigid material to avoid significant torsional deformation in operating conditions. In practice, it is necessary to trade-off manufacturing simplicity and mechanical rigidity of a blade design against aerodynamic performance. This paper presents a design methodology for this problem, based on development of a simulator for steady-state rotor performance along with a search algorithm to find the ideal taper and twist geometry for a specified motor torque. The approach is demonstrated on the design of rotors for a small scale quad-rotor unmanned aerial vehicle under development at the Australian National University. Experimental thrust tests indicate good correspondence with theoretical predications. Nomenclature A Rotor disc area, m2 AoA Angle of Attack, rad c Blade chord, m cd Non-dimensional drag coefficient cl Non-dimensional lift coefficient cm Non-dimensional moment coefficient

Paul Pounds; Robert Mahony

2005-01-01T23:59:59.000Z

111

An experimental study on improvement of a Savonius rotor performance with curtaining  

Science Conference Proceedings (OSTI)

This study introduces a new curtaining arrangement to improve the performance of Savonius wind rotors. The curtain arrangement was placed in front of the rotor preventing the negative torque opposite the rotor rotation. The geometrical parameters of the curtain arrangement were optimized to generate an optimum performance. The rotor with different curtain arrangements was tested out of a wind tunnel, and its performance was compared with that of the conventional rotor. The maximum power coefficient of the Savonius wind rotor is increased to about 38.5% with the optimum curtain arrangement. The experimental results showed that the performance of Savonius wind rotors could be improved with a suitable curtain arrangement. (author)

Altan, Burcin Deda; Atilgan, Mehmet [Department of Mechanical Engineering, Faculty of Engineering, Pamukkale University, Kinikli 20070 Denizli (Turkey); Oezdamar, Aydogan [Department of Mechanical Engineering, Faculty of Engineering, Ege University, Bornova, 35100 Izmir (Turkey)

2008-09-15T23:59:59.000Z

112

Control coil arrangement for a rotating machine rotor  

DOE Patents (OSTI)

A rotating machine (e.g., a turbine, motor or generator) is provided wherein a fixed solenoid or other coil configuration is disposed adjacent to one or both ends of the active portion of the machine rotor for producing an axially directed flux in the active portion so as to provide planar axial control at single or multiple locations for rotor balance, levitation, centering, torque and thrust action. Permanent magnets can be used to produce an axial bias magnetic field. The rotor can include magnetic disks disposed in opposed, facing relation to the coil configuration.

Shah, Manoj R. (Latham, NY); Lewandowsk, Chad R. (Amsterdam, NY)

2001-07-31T23:59:59.000Z

113

Control Coil Arrangement for a Rotating Machine Rotor  

DOE Patents (OSTI)

A rotating machine (e.g., a turbine, motor or generator) is provided wherein a fixed solenoid or other coil configuration is disposed adjacent to one or both ends of the active portion of the machine rotor for producing an axially directed flux in the active portion so as to provide planar axial control at single or multiple locations for rotor balance, levitation, centering, torque and thrust action. Permanent magnets can be used to produce an axial bias magnetic field. The rotor can include magnetic disks disposed in opposed, facing relation to the coil configuration.

Shah, Manoj R.; Lewandowski, Chad R.

1999-05-05T23:59:59.000Z

114

Tilt Rotor Aeromechanics Phenomena in Low Speed Flight  

Science Conference Proceedings (OSTI)

This work investigates important aeromechanics phenomena affecting the V-22 tilt rotor in low speed sideward flight or while hovering in quartering or crosswind conditions. These phenomena, such as pitch-up with sideslip and increased power required ...

Mark A. Potsdam; Mark J. Silva

2004-06-01T23:59:59.000Z

115

The Dynamics of Mountain-Wave-Induced Rotors  

Science Conference Proceedings (OSTI)

The development of rotor flow associated with mountain lee waves is investigated through a series of high-resolution simulations with the nonhydrostatic Coupled Ocean–Atmospheric Mesoscale Prediction System (COAMPS) model using free-slip and no-...

James D. Doyle; Dale R. Durran

2002-01-01T23:59:59.000Z

116

Chip-Firing and Rotor-Routing on Directed Graphs  

E-Print Network (OSTI)

We give a rigorous and self-contained survey of the abelian sandpile model and rotor-router model on finite directed graphs, highlighting the connections between them. We present several intriguing open problems.

Holroyd, Alexander E; Meszaros, Karola; Peres, Yuval; Propp, James; Wilson, David B

2008-01-01T23:59:59.000Z

117

Gas Turbine Rotor Life Evaluation: GE 7E/EA  

Science Conference Proceedings (OSTI)

Gas turbine rotor materials are subject to degradation from prolonged hours and multiple start/stop cycles of operation. Periodically, plant operators disassemble the compressor and turbine sections of the rotor system and inspect the components for signs of creep, embrittlement, corrosion, thermal fatigue, and high- and low-cycle fatigue. These inspections typically take place during hot-gas-path and major maintenance intervals when casings are removed. This report provides results of an analysis to est...

2011-10-26T23:59:59.000Z

118

On the Spectrum of the Resonant Quantum Kicked Rotor  

E-Print Network (OSTI)

It is proven that none of the bands in the quasi-energy spectrum of the Quantum Kicked Rotor is flat at any primitive resonance of any order. Perturbative estimates of bandwidths at small kick strength are established for the case of primitive resonances of prime order. Different bands scale with different powers of the kick strength, due to degeneracies in the spectrum of the free rotor.

Italo Guarneri

2009-02-23T23:59:59.000Z

119

On the Spectrum of the Resonant Quantum Kicked Rotor  

E-Print Network (OSTI)

It is proven that none of the bands in the quasi-energy spectrum of the Quantum Kicked Rotor is flat at any primitive resonance of any order. Perturbative estimates of bandwidths at small kick strength are established for the case of primitive resonances of prime order. Different bands scale with different powers of the kick strength, due to degeneracies in the spectrum of the free rotor.

Guarneri, Italo

2009-01-01T23:59:59.000Z

120

Sub-ballistic behaviour of the Quantum Kicked Rotor  

E-Print Network (OSTI)

We study the resonances of the quantum kicked rotor subjected to an excitation that follows an aperiodic Fibonacci prescription. In such a case the secondary resonances show a sub-ballistic behaviour like the quantum walk with the same aperiodic prescription for the coin. The principal resonances maintain the well-known ballistic behaviour. Then the parallelism previusly established between the kicked rotor and the generalized quantum walk is retained only with the secondary resonances.

A. Romanelli; A. Auyuanet; R. Siri; V. Micenmacher

2006-07-20T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Proposed Update of SAFER-PC Rotor Life Assessment Code  

Science Conference Proceedings (OSTI)

Evaluating the remaining life of power plant turbine and generator rotors is a perennial dilemma facing utility engineers. Extended operation of a critically flawed rotor can result in catastrophic failure. Conversely, premature retirement of equipment burdens a utility financially. With today's pressures to reduce operation and maintenance costs, life extension and maintenance of plant components is receiving considerable attention. Accurate component life assessment is crucial in developing a technical...

1999-12-13T23:59:59.000Z

122

Whole blood analysis rotor assembly having removable cellular sedimentation bowl  

DOE Patents (OSTI)

A rotor assembly for performing photometric analyses using whole blood samples is described. Following static loading of a gross blood sample within a centrally located, removable, cell sedimentation bowl, the red blood cells in the gross sample are centrifugally separated from the plasma, the plasm displaced from the sedimentation bowl, and measured subvolumes of plasma distributed to respective sample analysis cuvettes positioned in an annular array about the rotor periphery. Means for adding reagents to the respective cuvettes are also described. (auth)

Burtis, C.A.; Johnson, W.F.

1975-08-26T23:59:59.000Z

123

The Rotor-Router Model on Regular Trees  

E-Print Network (OSTI)

The rotor-router model is a deterministic analogue of random walk. It can be used to define a deterministic growth model analogous to internal DLA. We show that if the initial rotor configuration is acyclic, then the set of occupied sites for rotor-router aggregation on an infinite regular tree is a perfect ball whenever it can be. This is proved by defining the rotor-router group of a graph, which we show is isomorphic to the sandpile group. We also address the question of recurrence and transience: We give two rotor configurations on the infinite ternary tree, one for which chips exactly alternate escaping to infinity with returning to the origin, and one for which every chip returns to the origin. We also characterize the possible "escape sequences" for the ternary tree, that is, binary words $a_1 ... a_n$ for which there exists a rotor configuration so that the $k$-th chip escapes to infinity if and only if $a_k=1$.

Landau, Itamar

2007-01-01T23:59:59.000Z

124

The Rotor-Router Model on Regular Trees  

E-Print Network (OSTI)

The rotor-router model is a deterministic analogue of random walk. It can be used to define a deterministic growth model analogous to internal DLA. We show that the set of occupied sites for this model on an infinite regular tree is a perfect ball whenever it can be, provided the initial rotor configuration is acyclic (that is, no two neighboring vertices have rotors pointing to one another). This is proved by defining the rotor-router group of a graph, which we show is isomorphic to the sandpile group. We also address the question of recurrence and transience: We give two rotor configurations on the infinite ternary tree, one for which chips exactly alternate escaping to infinity with returning to the origin, and one for which every chip returns to the origin. Further, we characterize the possible “escape sequences ” for the ternary tree, that is, binary words a1... an for which there exists a rotor configuration so that the k-th chip escapes to infinity if and only if ak = 1. 1

Itamar L; Lionel Levine

2008-01-01T23:59:59.000Z

125

The Rotor-Router Model on Regular Trees  

E-Print Network (OSTI)

The rotor-router model is a deterministic analogue of random walk. It can be used to define a deterministic growth model analogous to internal DLA. We show that the set of occupied sites for this model on an infinite regular tree is a perfect ball whenever it can be, provided the initial rotor configuration is acyclic (that is, no two neighboring vertices have rotors pointing to one another). This is proved by defining the rotor-router group of a graph, which we show is isomorphic to the sandpile group. We also address the question of recurrence and transience: We give two rotor configurations on the infinite ternary tree, one for which chips exactly alternate escaping to infinity with returning to the origin, and one for which every chip returns to the origin. Further, we characterize the possible “escape sequences ” for the ternary tree, that is, binary words a1... an for which there exists a rotor configuration so that the k-th chip escapes to infinity if and only if ak = 1.

Itamar Landau; Lionel Levine

2008-01-01T23:59:59.000Z

126

Structural testing of the North Wind 250 composite rotor joint  

DOE Green Energy (OSTI)

The North Wind 250 wind turbine is under development at Northern Power Systems (NPS) in Moretown, VT. The turbine uses a unique, flow-through, teetered-rotor design. This design eliminates structural discontinuities at the blade/hub interface by fabricating the rotor as one continuous structural element. To accomplish this, the two blade spars are joined at the center of the rotor using a proprietary bonding technique. Fatigue tests were conducted on the full-scale rotor joint at the National Renewable Energy Laboratory (NREL). Subsequent tests are now underway to test the full-scale rotor and hub assembly to verify the design assumptions. The test articles were mounted in dedicated test fixtures. For the joint test, a constant moment was generated across the joint and parent material. Hydraulic actuators applied sinusoidal loading to the test article at levels equivalent to 90% of the extreme wind load for over one million cycles. When the loading was increased to 112% of the extreme wind load, the joint failed by buckling. Strain levels were monitored at 14 locations inside and outside of the blade joint during the test. The tests were used to qualify this critical element of the rotor for field testing and to provide information needed to improve the structural design of the joint.

Musial, W; Link, H [National Renewable Energy Lab., Golden, CO (United States); Coleman, C [Northern Power Systems, Moretown, VT (United States)

1994-05-01T23:59:59.000Z

127

Copper in the Rotor for Lighter, Longer Lasting Motors  

E-Print Network (OSTI)

This paper reviews the advantages of substituting die-cast copper for aluminum in the motor rotor. This advance in motor technology has been long sought by the motor industry but short die life due to the high melting point of copper frustrated attempts to manufacture by pressure die casting. The nickel-base alloy hot die technology developed to solve the manufacturing problem is briefly reviewed. Development work done prior to the present program and commercial motors derived from that work have focused on the increased electrical energy efficiency achievable by using copper with its higher electrical conductivity in the rotor. Performance characteristics of example industrial motors are presented. Modification of the conductor bar shape to control in-rush current and starting torque to accommodate copper in the rotor will be discussed. Modeling by motor manufacturers has shown that by using copper in the rotor, a lighter motor than an aluminum rotor motor at the same efficiency can be built. An example of weight savings calculated for a 15 Hp (11 kW) motor is presented. Data presented here show that motors with copper rotors run cooler. Industry experience shows that cooler operation translates to reduced maintenance costs, improved reliability and longer motor life.

C. Stark; J. G. Cowie; D. T. Peters; E. F. Brush

2005-01-01T23:59:59.000Z

128

Using a collision model to design safer wind turbine rotors for birds  

Science Conference Proceedings (OSTI)

A mathematical model for collisions between birds and propeller-type turbine rotors identifies the variables that can be manipulated to reduce the probability that birds will collide with the rotor. This study defines a safety index--the clearance power density--that allows rotors of different sizes and designs to be compared in terms of the amount of wind energy converted to electrical energy per bird collision. The collision model accounts for variations in wind speed during the year and shows that for model rotors with simple, one-dimensional blades, the safety index increases in proportion to rotor diameter, and variable speed rotors have higher safety indexes than constant speed rotors. The safety index can also be increased by enlarging the region near the center of the rotor hub where the blades move slowly enough for birds to avoid them. Painting the blades to make them more visible might have this effect. Model rotors with practical designs can have safety indexes an order of magnitude higher than those for model rotors typical of the constant speeds rotors in common use today. This finding suggests that redesigned rotors could have collision rates with birds perhaps an order of magnitude lower than today`s rotors, with no reduction in the production of wind power. The empirical data that exist for collisions between raptors, such as hawks and eagles, and rotors are consistent with the model: the numbers of raptor carcasses found beneath large variable speed rotors, relative to the numbers found under small constant speed rotors, are in the proportions predicted by the collision model rather than in proportion to the areas swept by the rotor blades. However, uncontrolled variables associated with these data prevent a stronger claim of support for the model.

Tucker, V.A. [Duke Univ., Durham, NC (United States). Dept. of Zoology

1996-11-01T23:59:59.000Z

129

Rotor apparatus for high strength undiffused brushless electric machine  

DOE Patents (OSTI)

A radial gap brushless electric machine (30) having a stator (31) and a rotor (32) and a main air gap (34) also has at least one stationary excitation coil (35a, 36a) separated from the rotor (32) by a secondary air gap (35e, 35f, 36e, 36f) so as to induce a secondary flux in the rotor (32) which controls a resultant flux in the main air gap (34). Permanent magnetic (PM) material (38) is disposed in spaces between the rotor pole portions (39) to inhibit the second flux from leaking from the pole portions (39) prior to reaching the main air gap (34). By selecting the direction of current in the stationary excitation coil (35a, 36a) both flux enhancement and flux weakening are provided for the main air gap (34). Improvements of a laminated rotor, an end pole structure, and an arrangement of the PM elements for providing an arrangement of the flux paths from the auxiliary field coil assemblies are also disclosed.

Hsu, John S [Oak Ridge, TN

2006-01-24T23:59:59.000Z

130

Hi-Q Rotor - Low Wind Speed Technology  

DOE Green Energy (OSTI)

The project objective was to optimize the performance of the Hi-Q Rotor. Early research funded by the California Energy Commission indicated the design might be advantageous over state-of-the-art turbines for collecting wind energy in low wind conditions. The Hi-Q Rotor is a new kind of rotor targeted for harvesting wind in Class 2, 3, and 4 sites, and has application in areas that are closer to cities, or 'load centers.' An advantage of the Hi-Q Rotor is that the rotor has non-conventional blade tips, producing less turbulence, and is quieter than standard wind turbine blades which is critical to the low-wind populated urban sites. Unlike state-of-the-art propeller type blades, the Hi-Q Rotor has six blades connected by end caps. In this phase of the research funded by DOE's Inventions and Innovation Program, the goal was to improve the current design by building a series of theoretical and numeric models, and composite prototypes to determine a best of class device. Development of the rotor was performed by aeronautical engineering and design firm, DARcorporation. From this investigation, an optimized design was determined and an 8-foot diameter, full-scale rotor was built and mounted using a Bergey LX-1 generator and furling system which were adapted to support the rotor. The Hi-Q Rotor was then tested side-by-side against the state-of-the-art Bergey XL-1 at the Alternative Energy Institute's Wind Test Center at West Texas State University for six weeks, and real time measurements of power generated were collected and compared. Early wind tunnel testing showed that the cut-in-speed of the Hi-Q rotor is much lower than a conventional tested HAWT enabling the Hi-Q Wind Turbine to begin collecting energy before a conventional HAWT has started spinning. Also, torque at low wind speeds for the Hi-Q Wind Turbine is higher than the tested conventional HAWT and enabled the wind turbine to generate power at lower wind speeds. Based on the data collected, the results of our first full-scale prototype wind turbine proved that higher energy can be captured at lower wind speeds with the new Hi-Q Rotor. The Hi-Q Rotor is almost 15% more productive than the Bergey from 6 m/s to 8 m/s, making it ideal in Class 3, 4, and 5 wind sites and has application in the critical and heretofore untapped areas that are closer to cities, 'load centers,' and may even be used directly in urban areas. The additional advantage of the Hi-Q Rotor's non-conventional blade tips, which eliminates most air turbulence, is noise reduction which makes it doubly ideal for populated urban areas. Hi-Q Products recommends one final stage of development to take the Hi-Q Rotor through Technology Readiness Levels 8-9. During this stage of development, the rotor will be redesigned to further increase efficiency, match the rotor to a more suitable generator, and lower the cost of manufacturing by redesigning the structure to allow for production in larger quantities at lower cost. Before taking the rotor to market and commercialization, it is necessary to further optimize the performance by finding a better generator and autofurling system, ones more suitable for lower wind speeds and rpms should be used in all future testing. The potential impact of this fully developed technology will be the expansion and proliferation of energy renewal into the heretofore untapped Class 2, 3, 4, and 5 Wind Sites, or the large underutilized sites where the wind speed is broken by physical features such as mountains, buildings, and trees. Market estimates by 2011, if low wind speed technology can be developed are well above: 13 million homes, 675,000 commercial buildings, 250,000 public facilities. Estimated commercial exploitation of the Hi-Q Rotor show potential increase in U.S. energy gained through the clean, renewable wind energy found in low and very low wind speed sites. This new energy source would greatly impact greenhouse emissions as well as the public sector's growing energy demands.

Todd E. Mills; Judy Tatum

2010-01-11T23:59:59.000Z

131

Rotating Shake Test and Modal Analysis of a Model Helicopter Rotor Blade  

Science Conference Proceedings (OSTI)

Rotating blade frequencies for a model generic helicopter rotor blade mounted on an articulated hub were experimentally determined. Testing was conducted using the Aeroelastic Rotor Experimental System (ARES) testbed in the Helicopter Hover Facility ...

Wilkie W. Keats; Mirick Paul H.; Langston Chester W.

1997-06-01T23:59:59.000Z

132

Method and apparatus for assembling permanent magnet rotors  

DOE Patents (OSTI)

A permanent magnet assembly for assembly in large permanent magnet motors and generators includes a two-piece carrier that can be slid into a slot in the rotor and then secured in place using a set screw. The invention also provides an auxiliary carrier device with guide rails that line up with the teeth of the rotor, so that a permanent magnet assembly can be pushed first into a slot, and then down the slot to its proper location. An auxiliary tool is provided to move the permanent magnet assembly into position in the slot before it is secured in place. Methods of assembling and disassembling the magnet assemblies in the rotor are also disclosed. 2 figs.

Hsu, J.S.; Adams, D.J.

1999-06-22T23:59:59.000Z

133

Operating Modes of a Teeter-Rotor Wind Turbine  

DOE Green Energy (OSTI)

We examine the operating modes of a two-bladed teetered wind turbine. Because of the gyroscopic asymmetry of its rotor, this turbine's dynamics can be quite distinct from those of a turbine with three or more blades. This asymmetry leads to system equations with periodic coefficients that are solved using the Floquet approach to extract the correct modal parameters. The system equations are derived using a simple analytical model with four degrees of freedom: cacelle yaw, rotor teeter, and flapping associated with each blade. Results confirm that the turbine modes become more dominated by the centrifugal and gyroscopic effects as the rotor speed increases. They gyroscopic effect may also cause dynamic instability. Under certain design conditions, yaw and teeter modal frequencies may coalesce.

Bir, G. S. (National Renewable Energy Laboratory); Stol, K. (University of Colorado at Boulder)

1999-02-25T23:59:59.000Z

134

Rotor-router aggregation on the layered square lattice  

E-Print Network (OSTI)

In rotor-router aggregation on the square lattice Z^2, particles starting at the origin perform deterministic analogues of random walks until reaching an unoccupied site. The limiting shape of the cluster of occupied sites is a disk. We consider a small change to the routing mechanism for sites on the x- and y-axes, resulting in a limiting shape which is a diamond instead of a disk. We show that for a certain choice of initial rotors, the occupied cluster grows as a perfect diamond.

Kager, Wouter

2010-01-01T23:59:59.000Z

135

Quantum phase transitions in the quasi-periodic kicked rotor  

E-Print Network (OSTI)

We present a microscopic theory of transport in quasi-periodically driven environments (`kicked rotors'), as realized in recent atom optic experiments. We find that the behavior of these systems depends sensitively on the value of Planck's constant $\\tilde h$: for irrational values of $\\tilde h/(4\\pi)$ they fall into the universality class of disordered electronic systems and we derive the microscopic theory of the ensuing localization phenomena. In contrast, for rational values the rotor-Anderson insulator acquires an infinite (static) conductivity and turns into a `super-metal'. Signatures of the corresponding metal/super-metal transition are discussed.

Chushun Tian; Alexander Altland; Markus Garst

2011-01-17T23:59:59.000Z

136

Unsteady rotor-stator interaction in a low pressure centrifugal compressor  

Science Conference Proceedings (OSTI)

The aim of this paper is to study the unsteady rotor-stator interaction in a low-pressure centrifugal compressor using the finite volume method to solve the Unsteady Reynolds-Averaged Navier-Stokes. In order to understand better, the rotor-stator interaction, ... Keywords: Adamczyk decomposition, CFD, POD, URANS, compressor, unsteady rotor-stator interaction

Mihai Leonida Niculescu; Sterian D?n?il?

2010-04-01T23:59:59.000Z

137

A permanent-magnet rotor for a high-temperature superconducting bearing  

DOE Green Energy (OSTI)

Design, fabrication, and performance, of a 1/3-m dia., 10-kg flywheel rotor with only one bearing is discussed. To achieve low-loss energy storage, the rotor`s segmented-ring permanent-magnet (PM) is optimized for levitation and circumferential homogeneity. The magnet`s carbon composite bands enable practical energy storage.

Mulcahy, T.M.; Hull, J.R.; Uherka, K.L. [Argonne National Lab., IL (United States); Abboud, R.G. [Commonwealth Research Corp., Chicago, IL (United States); Wise, J.H.; Carnegie, D.W. [Pennsylvania State Univ., University Park, PA (United States). Engineering Science

1995-07-01T23:59:59.000Z

138

Modeling and linear function parametric identification for a helicopter main rotor  

Science Conference Proceedings (OSTI)

A model of a helicopter test rotor obtained according to the Euler-Lagrange approach is presented. A simplified linear representation for this model, suitable for control system design, is also proposed. The dynamics of the helicopter test rotor are ... Keywords: helicopter rotors, identification, modeling

José M. Molinar-Monterrubio; Rafael Castro-Linares; Eduardo Licéaga-Castro

2007-05-01T23:59:59.000Z

139

To Design, Build and Test a Wireless Measurement System for Machine Rotor  

Science Conference Proceedings (OSTI)

A wireless measurement system was designed to detect the rotor current of an induction machine. The reason of using wireless technique instead of wire is that it is difficult to connect measured components with wire directly from the rotor which is running ... Keywords: wireless measurement system, machine rotor

Jieyin Zhang; Minxia Zhang

2009-03-01T23:59:59.000Z

140

A new field balancing method of rotor systems based on holospectrum and genetic algorithm  

Science Conference Proceedings (OSTI)

Field balancing of flexible rotor system is a key technique to reduce turbine vibration in power plants. Traditional balancing methods are generally based on the information from a unidirectional sensor. In fact, the motion of a rotor system is a complex ... Keywords: Field balancing, Flexible rotor, Genetic algorithm, Holospectrum

Shi Liu; Liangsheng Qu

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Cirriform Rotor Cloud Observed on a Canadian Arctic Ice Cap  

Science Conference Proceedings (OSTI)

A thin rotor cloud was observed on the lee side of Penny Ice Cap in the Canadian Arctic on 21 April 1996. The cloud consisted of thin cirriform layers, so that its motion was clearly observed. By means of time-lapse camera photography, the ...

Hisashi Ozawa; Kumiko Goto-Azuma; Koyuru Iwanami; Roy M. Koerner

1998-06-01T23:59:59.000Z

142

Early Observations of Rotor Clouds by Andrija Mohorovi?i?  

Science Conference Proceedings (OSTI)

This article delivers a short history of the early quantitative documentation of a rotor-type circulation in the bora-type flow on the northern Adriatic by Andrija Mohorovi?i?, an all-around geophysicist and the father of Croatian geophysical ...

Vanda Grubiši?; Mirko Orli?

2007-05-01T23:59:59.000Z

143

Counter Rotating Open Rotor Animation using Particle Image Velocimetry  

E-Print Network (OSTI)

This article describes the two accompanying fluid dynamics videos for the "Counter rotating open rotor flow field investigation using stereoscopic Particle Image Velocimetry" presented at the 64th Annual Meeting of the APS Division of Fluid Dynamics in Baltimore, Maryland, November 20-22, 2011.

Roosenboom, E W M; Geisler, R; Pallek, D; Agocs, J; Neitzke, K -P

2011-01-01T23:59:59.000Z

144

Helical-rotor expander applications for geothermal energy conversion  

DOE Green Energy (OSTI)

The helical-rotor expander is one of numerous candidates for the direct ''total flow'' expansion of geothermal fluids. The potential exists for expansion efficiencies as high as 70 percent. Engine efficiencies will generally be below 70 percent because of an expansion-ratio limitation of 15 and a maximum pressure differential of 110 psi. Single-stage expansion of self-pumped geothermal fluids from reservoirs at 350 to 752/sup 0/F gives engine efficiencies in the range from 57.3 to 43.1 percent. Calculated rotor diameters range from 10.5 to 41.6 ft for a range of outputs of 5 to 40 MW. Two-stage expansion of fluid from the 572/sup 0/F reservoir gives an engine efficiency of 62.3 percent and a 21 percent reduction in the diameter of the larger rotor. Rotor diameters can be held to more reasonable sizes by using the expander in combination with a vapor turbine.

House, P.A.

1976-04-01T23:59:59.000Z

145

Coplanar Doppler Lidar Retrieval of Rotors from T-REX  

Science Conference Proceedings (OSTI)

Dual-Doppler analysis of data from two coherent lidars during the Terrain-Induced Rotor Experiment (T-REX) allows the retrieval of flow structures, such as vortices, during mountain-wave events. The spatial and temporal resolution of this ...

Michael Hill; Ron Calhoun; H. J. S. Fernando; Andreas Wieser; Andreas Dörnbrack; Martin Weissmann; Georg Mayr; Robert Newsom

2010-03-01T23:59:59.000Z

146

Performance of twist-coupled blades on variable speed rotors  

DOE Green Energy (OSTI)

The load mitigation and energy capture characteristics of twist-coupled HAWT blades that are mounted on a variable speed rotor are investigated in this paper. These blades are designed to twist toward feather as they bend with pretwist set to achieve a desirable twist distribution at rated power. For this investigation, the ADAMS-WT software has been modified to include blade models with bending-twist coupling. Using twist-coupled and uncoupled models, the ADAMS software is exercised for steady wind environments to generate C{sub p} curves at a number of operating speeds to compare the efficiencies of the two models. The ADAMS software is also used to generate the response of a twist-coupled variable speed rotor to a spectrum of stochastic wind time series. This spectrum contains time series with two mean wind speeds at two turbulence levels. Power control is achieved by imposing a reactive torque on the low speed shaft proportional to the RPM squared with the coefficient specified so that the rotor operates at peak efficiency in the linear aerodynamic range, and by limiting the maximum RPM to take advantage of the stall controlled nature of the rotor. Fatigue calculations are done for the generated load histories using a range of material exponents that represent materials from welded steel to aluminum to composites, and results are compared with the damage computed for the rotor without twist-coupling. Results indicate that significant reductions in damage are achieved across the spectrum of applied wind loading without any degradation in power production.

Lobitz, D.W.; Veers, P.S.; Laino, D.J.

1999-12-07T23:59:59.000Z

147

Deutsche Rotor und Turm Service GmbH Co KG DRTS | Open Energy Information  

Open Energy Info (EERE)

Rotor und Turm Service GmbH Co KG DRTS Rotor und Turm Service GmbH Co KG DRTS Jump to: navigation, search Name Deutsche Rotor und Turm Service GmbH & Co KG (DRTS) Place Bremen, Germany Zip 28239 Sector Wind energy Product Service company for wind turbine blades and towers. References Deutsche Rotor und Turm Service GmbH & Co KG (DRTS)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Deutsche Rotor und Turm Service GmbH & Co KG (DRTS) is a company located in Bremen, Germany . References ↑ "Deutsche Rotor und Turm Service GmbH & Co KG (DRTS)" Retrieved from "http://en.openei.org/w/index.php?title=Deutsche_Rotor_und_Turm_Service_GmbH_Co_KG_DRTS&oldid=344202" Categories:

148

Steam Turbine Rotor Life Assessment and Extension: Evaluation of Retired Rotors: Volume 1: Quantification of NDE Uncertainty  

Science Conference Proceedings (OSTI)

In the past, uncertainty in defect sizing during boresonic inspection has been a major source of inaccuracy in assessing the remaining life of steam turbine rotors. This report provides correlations between the boresonically reported defect sizes and the measured metallurgical sizes for

1994-05-14T23:59:59.000Z

149

Analysis of a teetered, variable-speed rotor: final report  

DOE Green Energy (OSTI)

A computer model of a horizontal axis wind turbine (HOOT) with four structural degrees of freedom has been derived and verified. The four degrees of freedom include flapwise motion of the blades, teeter motion, and variable rotor speed. Options for the variable rotor speed include synchronous, induction, and constant-tip speed generator models with either start, stop, or normal operations. Verification is made by comparison with analytical solutions and mean and cyclic ESI-80 data. The Veers full-field turbulence model is used as a wind input for a synchronous and induction generator test case during normal operation. As a result of the comparison, it is concluded that the computer model can be used to predict accurately mean and cyclic loads with a turbulent wind input. 47 refs., 19 figs.

Weber, T.L.; Wilson, R.E.; Walker, S.N. (Oregon State Univ., Corvallis, OR (USA). Dept. of Mechanical Engineering) [Oregon State Univ., Corvallis, OR (USA). Dept. of Mechanical Engineering

1991-06-01T23:59:59.000Z

150

Flywheel rotor and containment technology development, FY83  

DOE Green Energy (OSTI)

The Department of Energy decided to terminate the Flywheel Rotor and Containment Technology Development project during FY 1983. Activities this year included fabrication, inspection, and test evaluation of rotor and containment structures. A peak energy of 700 Wh was stored at an energy density of 70 Wh/kg. In cyclic tests, 10,000 cycles from design speed to half speed were logged without failure. The first test of a lightweight containment structure indicates the need for additional development. In complementary studies, production cost estimates were made for three flywheel designs. In a cooperative program with the University of Wisconsin, work began on construction of a flywheel/continuously variable transmission/heat engine car which promises fuel economy improvements of up to 100%. Suggestions are made for the direction of future work when interest in flywheel system reappears.

Mohr, P.B.; Walter, C.E.

1983-09-12T23:59:59.000Z

151

Aeroacoustics and aerodynamic performance of a rotor with flatback airfoils.  

Science Conference Proceedings (OSTI)

The aerodynamic performance and aeroacoustic noise sources of a rotor employing flatback airfoils have been studied in field test campaign and companion modeling effort. The field test measurements of a sub-scale rotor employing nine meter blades include both performance measurements and acoustic measurements. The acoustic measurements are obtained using a 45 microphone beamforming array, enabling identification of both noise source amplitude and position. Semi-empirical models of flatback airfoil blunt trailing edge noise are developed and calibrated using available aeroacoustic wind tunnel test data. The model results and measurements indicate that flatback airfoil noise is less than drive train noise for the current test turbine. It is also demonstrated that the commonly used Brooks, Pope, and Marcolini model for blunt trailing edge noise may be over-conservative in predicting flatback airfoil noise for wind turbine applications.

Paquette, Joshua A.; Barone, Matthew Franklin; Christiansen, Monica (Pennsylvania State University, State College, PA); Simley, Eric (University of Colorado, Boulder, CO)

2010-06-01T23:59:59.000Z

152

Sweep-twist adaptive rotor blade : final project report.  

DOE Green Energy (OSTI)

Knight & Carver was contracted by Sandia National Laboratories to develop a Sweep Twist Adaptive Rotor (STAR) blade that reduced operating loads, thereby allowing a larger, more productive rotor. The blade design used outer blade sweep to create twist coupling without angled fiber. Knight & Carver successfully designed, fabricated, tested and evaluated STAR prototype blades. Through laboratory and field tests, Knight & Carver showed the STAR blade met the engineering design criteria and economic goals for the program. A STAR prototype was successfully tested in Tehachapi during 2008 and a large data set was collected to support engineering and commercial development of the technology. This report documents the methodology used to develop the STAR blade design and reviews the approach used for laboratory and field testing. The effort demonstrated that STAR technology can provide significantly greater energy capture without higher operating loads on the turbine.

Ashwill, Thomas D.

2010-02-01T23:59:59.000Z

153

Variable speed operation of generators with rotor-speed feedback in wind power applications  

SciTech Connect

The use of induction generators in wind power applications has been common since the early development of the wind industry. Most of these generators operate at fixed frequency and are connected directly to the utility grid. Unfortunately, this mode of operation limits the rotor speed to a specific rpm. Variable-speed operation is preferred in order to facilitate maximum energy capture over a wide range of wind speeds. This paper explores variable-speed operating strategies for wind turbine applications. The objectives are to maximize energy production, provide controlled start-up and reduce torque loading. This paper focuses on optimizing the energy captured by operating at maximum aerodynamic efficiency at any wind speed. The control strategy we analyze uses rotor speed and generator power as the feedback signals. In the normal operating region, rotor speed is used to compute a target power that corresponds to optimum operation. With power as the control objective, the power converter and generator are controlled to track the target power at any rpm. Thus, the torque-speed characteristic of the generator is shaped to optimize the energy capture. The target power is continuously updated at any rpm. in extreme areas of the operating envelope, during start-up, shutdown, generator overload, or overspeed, different strategies driven by other system considerations must be used.

Muljadi, E.; Butterfield, C.P.; Migliore, P.

1995-11-01T23:59:59.000Z

154

New forms of BRST symmetry in rigid rotor  

E-Print Network (OSTI)

We derive the different forms of BRST symmetry by using the Batalin-Fradkin-Vilkovisky formalism in a rigid rotor. The so called "dual-BRST" symmetry is obtained from usual BRST symmetry by making a canonical transformation in the ghost sector. On the other hand, a canonical transformation in the sector involving Lagrange multiplier and its corresponding momentum leads to a new form of BRST as well as dual-BRST symmetry.

Sumit Kumar Rai; Bhabani Prasad Mandal

2010-01-29T23:59:59.000Z

155

Universality of the Anderson transition with the quasiperiodic kicked rotor  

E-Print Network (OSTI)

We report a numerical analysis of the Anderson transition in a quantum-chaotic system, the quasiperiodic kicked rotor with three incommensurate frequencies. It is shown that this dynamical system exhibits the same critical phenomena as the truly random 3D-Anderson model. By taking proper account of systematic corrections to one-parameter scaling, the universality of the critical exponent is demonstrated. Our result $\

G. Lemarié; B. Grémaud; D. Delande

2009-04-15T23:59:59.000Z

156

Fractional dynamics in the L\\'evy quantum kicked rotor  

E-Print Network (OSTI)

We investigate the quantum kicked rotor in resonance subjected to momentum measurements with a L\\'evy waiting time distribution. We find that the system has a sub-ballistic behavior. We obtain an analytical expression for the exponent of the power law of the variance as a function of the characteristic parameter of the L\\'evy distribution and connect this anomalous diffusion with a fractional dynamics.

Romanelli, Alejandro

2008-01-01T23:59:59.000Z

157

New forms of BRST symmetry in rigid rotor  

E-Print Network (OSTI)

We derive the different forms of BRST symmetry by using the Batalin-Fradkin-Vilkovisky formalism in a rigid rotor. The so called "dual-BRST" symmetry is obtained from usual BRST symmetry by making a canonical transformation in the ghost sector. On the other hand, a canonical transformation in the sector involving Lagrange multiplier and its corresponding momentum leads to a new form of BRST as well as dual-BRST symmetry.

Rai, Sumit Kumar

2010-01-01T23:59:59.000Z

158

Utility of atomic kicked-rotor interferometers for precision measurements  

Science Conference Proceedings (OSTI)

We theoretically investigate a proposed scheme to use an atomic {delta}-kicked rotor resonance for high-precision measurements of accelerations and the photon recoil frequency. Although the technique offers rapid scaling of the measurement sensitivity with pulse number, it also features a high sensitivity to initial atomic momentum. We find that for realistic atom sources, the momentum sensitivity significantly limits the achievable precision. We consider several different variations on the technique, but find similar limitations in all cases.

Horne, R. A.; Leonard, R. H.; Sackett, C. A. [Physics Department, University of Virginia, Charlottesville, Virginia 22904 (United States)

2011-06-15T23:59:59.000Z

159

Suppression of decoherence effects in the quantum kicked rotor  

E-Print Network (OSTI)

We describe a method allowing transient suppression of decoherence effects on the atom-optics realization of the kicked rotor. The system is prepared in an initial state with a momentum distribution concentrated in an interval much sharper than the Brillouin zone; the measure of the momentum distribution is restricted to this interval of quasimomenta: As most of the atoms undergoing decoherence processes fall outside this detection range and thus are not detected, the measured signal is effectively decoherence-free.

Maxence Lepers; Véronique Zehnlé; Jean Claude Garreau

2010-04-15T23:59:59.000Z

160

Fidelity of the near resonant quantum kicked rotor  

E-Print Network (OSTI)

We present a perturbative result for the temporal evolution of the fidelity of the quantum kicked rotor, i.e. the overlap of the same initial state evolved with two slightly different kicking strengths, for kicking periods close to a principal quantum resonance. Based on a pendulum approximation we describe the fidelity for rotational orbits in the pseudo-classical phase space of a corresponding classical map. Our results are compared to numerical simulations indicating the range of applicability of our analytical approximation.

Benedikt Probst; Remy Dubertrand; Sandro Wimberger

2011-04-14T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Fractional dynamics in the Lévy quantum kicked rotor  

E-Print Network (OSTI)

We investigate the quantum kicked rotor in resonance subjected to momentum measurements with a L\\'evy waiting time distribution. We find that the system has a sub-ballistic behavior. We obtain an analytical expression for the exponent of the power law of the variance as a function of the characteristic parameter of the L\\'evy distribution and connect this anomalous diffusion with a fractional dynamics.

Alejandro Romanelli

2008-04-15T23:59:59.000Z

162

Preform spar cap for a wind turbine rotor blade  

DOE Patents (OSTI)

A spar cap for a wind turbine rotor blade. The spar cap may include multiple preform components. The multiple preform components may be planar sheets having a swept shape with a first end and a second end. The multiple preform components may be joined by mating the first end of a first preform component to the second end of a next preform component, forming the spar cap.

Livingston, Jamie T. (Simpsonville, SC); Driver, Howard D. (Greer, SC); van Breugel, Sjef (Enschede, NL); Jenkins, Thomas B. (Cantonment, FL); Bakhuis, Jan Willem (Nijverdal, NL); Billen, Andrew J. (Daarlerveen, NL); Riahi, Amir (Pensacola, FL)

2011-07-12T23:59:59.000Z

163

Gas Turbine Rotor Life: General Electric FA Disc Cracking  

Science Conference Proceedings (OSTI)

This report covers the integrated results of the investigation into the occurrence of cooling slot and other rim cracking found in GE 7FA and 9FA gas turbine first and second stage rotor discs. Sections of the report address dimensional characterization, rim temperature measurement, metallurgical results, analytical methods, evaluation of mitigation approaches, and damage tolerance. Structural stress analysis assessed the effectiveness of the blend-polish-peen slot modification and a redesigned ...

2010-12-08T23:59:59.000Z

164

Blade platform seal for ceramic/metal rotor assembly  

DOE Patents (OSTI)

A combination ceramic and metal turbine rotor for use in high temperature gas turbine engines includes a metal rotor disc having a rim with a plurality of circumferentially spaced blade root retention slots therein to receive a plurality of ceramic blades, each including side platform segments thereon and a dovetail configured root slidably received in one of the slots. Adjacent ones of the platform segments including edge portions thereon closely spaced when the blades are assembled to form expansion gaps in an annular flow surface for gas passage through the blades and wherein the assembly further includes a plurality of unitary seal members on the rotor connected to its rim and each including a plurality of spaced, axially extending, flexible fingers that underlie and conform to the edge portions of the platform segments and which are operative at turbine operating temperatures and speeds to distribute loading on the platform segments as the fingers are seated against the underside of the blade platforms to seal the gaps without undesirably stressing thin web ceramic sections of the platform.

Wertz, John L. (Indianapolis, IN)

1982-01-01T23:59:59.000Z

165

Segmented and self-adjusting wind turbine rotors. Final report  

DOE Green Energy (OSTI)

An investigation was carried out to examine the use of blade aeroelastic properties for providing rotational speed control for a wind turbine generator (WTG). The study was specifically directed at obtaining a rotor configuration that has the capability for maintaining nearly constant torque at constant RPM in the presence of varying wind conditions and is aimed at eliminating the current requirement for mechanical pitch change devices. The approach considered is one in which rotor twist due to aerodynamic loading is used to adjust the blade's pitch as the wind speed changes. The preliminary design concept that has evolved is a flexible rotor blade formed from a series of individual, light, rigid segments that are arranged along the blade spar. Each segment can rotate around the spar but is restricted in pitch by a nonlinear mechanical spring. The results of performance calculations as well as vibration and flutter analyses are presented. Based on these results, the concept appears to provide an attractive solution to the problem of WTG operation in a varying wind field.

Jordan, P.F.; Goldman, R.L.

1976-04-01T23:59:59.000Z

166

Oxygen-Diffused Titanium as a Candidate Brake Rotor Material  

SciTech Connect

Titanium alloys are one of several candidate materials for the next generation of truck disk brake rotors. Despite their advantages of lightweight relative to cast iron and good strength and corrosion resistance, titanium alloys are unlikely to be satisfactory brake rotor materials unless their friction and wear behavior can be significantly improved. In this study, a surface engineering process oxygen diffusion was applied to titanium rotors and has shown very encouraging results. The oxygen diffused Ti-6Al-4V (OD-Ti) was tested on a sub-scale brake tester against a flat block of commercial brake lining material and benchmarked against several other Ti-based materials, including untreated Ti-6Al-4V, ceramic particle-reinforced Ti composites (MMCs), and a thermal-spray-coated Ti alloy. With respect to friction, the OD-Ti outperformed all other candidate materials under the imposed test conditions with the friction coefficient remaining within a desirable range of 0.35-0.50, even under the harshest conditions when the disk surface temperature reached nearly 600 ?C. In addition, the OD-Ti showed significantly improved wear-resistance over the non-treated one and was even better than the Ti-based composite materials.

Qu, Jun [ORNL; Blau, Peter Julian [ORNL; Jolly, Brian C [ORNL

2009-01-01T23:59:59.000Z

167

CFD analysis of rotating two-bladed flatback wind turbine rotor.  

DOE Green Energy (OSTI)

The effects of modifying the inboard portion of the NREL Phase VI rotor using a thickened, flatback version of the S809 design airfoil are studied using a three-dimensional Reynolds-averaged Navier-Stokes method. A motivation for using such a thicker airfoil design coupled with a blunt trailing edge is to alleviate structural constraints while reducing blade weight and maintaining the power performance of the rotor. The calculated results for the baseline Phase VI rotor are benchmarked against wind tunnel results obtained at 10, 7, and 5 meters per second. The calculated results for the modified rotor are compared against those of the baseline rotor. The results of this study demonstrate that a thick, flatback blade profile is viable as a bridge to connect structural requirements with aerodynamic performance in designing future wind turbine rotors.

van Dam, C.P. (University of California, David, CA); Chao, David D.; Berg, Dale E. (University of California, David, CA)

2008-04-01T23:59:59.000Z

168

A bubble-powered micro-rotor: conception, manufacturing, assembly, and characterization  

E-Print Network (OSTI)

A steady fluid flow, called microstreaming, can be generated in the vicinity of a micro-bubble excited by ultrasound. In this article, we use this phenomenon to assemble and power a microfabricated rotor at rotation speeds as high as 625 rpm. The extractible power is estimated to be on the order of a few femtowatts. A first series of experiments with uncontrolled rotor shapes is presented, demonstrating the possibility of this novel actuation scheme. A second series of experiments with 65 micron rotors micromanufactured in SU-8 resin are presented. Variables controlling the rotation speed and rotor stability are investigated, such as the bubble diameter, the acoustic excitation frequency and amplitude, and the rotor geometry. Finally, an outlook is provided on developing this micro-rotor into a MEMS-based motor capable of delivering tunable, infinitesimal rotary power at the microscale.

Kao, Jonathan; Warren, John; Xu, Jie; Attinger, Daniel; 10.1088/0960-1317/17/12/010

2009-01-01T23:59:59.000Z

169

Hydrodynamic Optimization Method and Design Code for Stall-Regulated Hydrokinetic Turbine Rotors  

DOE Green Energy (OSTI)

This report describes the adaptation of a wind turbine performance code for use in the development of a general use design code and optimization method for stall-regulated horizontal-axis hydrokinetic turbine rotors. This rotor optimization code couples a modern genetic algorithm and blade-element momentum performance code in a user-friendly graphical user interface (GUI) that allows for rapid and intuitive design of optimal stall-regulated rotors. This optimization method calculates the optimal chord, twist, and hydrofoil distributions which maximize the hydrodynamic efficiency and ensure that the rotor produces an ideal power curve and avoids cavitation. Optimizing a rotor for maximum efficiency does not necessarily create a turbine with the lowest cost of energy, but maximizing the efficiency is an excellent criterion to use as a first pass in the design process. To test the capabilities of this optimization method, two conceptual rotors were designed which successfully met the design objectives.

Sale, D.; Jonkman, J.; Musial, W.

2009-08-01T23:59:59.000Z

170

Preliminary structural design conceptualization for composite rotor for verdant power water current turbine  

DOE Green Energy (OSTI)

Sandia National Laboratories (SNL) and Verdant Power Inc. (VPI) have partnered under a Cooperative Research and Development Agreement (CRADA) to develop a new kinetic hydropower rotor. The rotor features an improved hydrodynamic and structural design which features state-of-the-art technology developed for the wind industry. The new rotor will have higher energy capture, increased system reliability, and reduction of overall cost of energy. This project was divided into six tasks: (1) Composite Rotor Project Planning and Design Specification; (2) Baseline Fatigue Testing and Failure analysis; (3) Develop Blade/Rotor Performance Model; (4) Hydrofoil Survey and Selection; (5) FEM Structural Design; and (6) Develop Candidate Rotor Designs and Prepare Final Report.

Paquette, J. A.

2012-03-01T23:59:59.000Z

171

Metallurgical Guidebook for Steam Turbine Rotors and Discs, Volume 2: Materials Property Database for HP-IP and LP Rotors  

Science Conference Proceedings (OSTI)

As the power plants are aging, many of the components have either surpassed or are nearing their intended design lives. Due to the range of temperatures the steam turbine components areexposed to, material composition, manufacturing and heat treatment methods, and property requirements vary widely. Having the proper knowledge about the vintage, manufacturing history, quality conditions, chemical and mechanical properties, etc., of the rotors and discs become vital when decisions about run, repair, or rep...

2010-12-23T23:59:59.000Z

172

Gas Turbine Rotor Life: CrMoV Material Testing, 2013 Status Report  

Science Conference Proceedings (OSTI)

Gas turbine rotor materials are subject to degradation from prolonged hours and multiple start/stop cycles of operation. Periodically, plant operators disassemble the compressor and turbine sections of the rotor system and inspect the components for signs of creep, embrittlement, corrosion, thermal fatigue, and high- and low-cycle fatigue. Beyond limited rotor inspections performed during hot gas path inspections and major overhauls, a more thorough inspection is often required by the equipment ...

2013-12-18T23:59:59.000Z

173

Analytical Parameterization of Rotors and Proof of a Goldberg Conjecture by Optimal Control Theory  

Science Conference Proceedings (OSTI)

Curves which can be rotated freely in an $n$-gon (that is, a regular polygon with $n$ sides) so that they always remain in contact with every side of the $n$-gon are called rotors. Using optimal control theory, we prove that the rotor with minimal area ... Keywords: Noether theorem, Pontryagin maximum principle, bang control, constant width bodies, convexity, optimal control, rotors, shape optimization, support function, switching point

Térence Bayen

2008-11-01T23:59:59.000Z

174

Gas Turbine Rotor Life Evaluation: GE 7FA and 9FA  

Science Conference Proceedings (OSTI)

Gas turbine rotor materials are subject to degradation from prolonged hours and multiple start/stop cycles of operation. Occasionally, plant operators have the compressor and turbine sections of the rotor system disassembled and the components inspected for signs of creep, embrittlement, corrosion, thermal fatigue, and high- and low-cycle fatigue. The inspection of rotor rim areas typically take place more regularly during hot-gas-path and major maintenance intervals when casings and blades are removed. ...

2011-12-19T23:59:59.000Z

175

Gas Turbine Rotor Life Evaluation: Siemens-Westinghouse W501B  

Science Conference Proceedings (OSTI)

Gas turbine rotor materials are subject to degradation from prolonged hours and multiple start/stop cycles of operation. Occasionally, plant operators have the compressor and turbine sections of the rotor system disassembled and the components inspected for signs of creep, embrittlement, corrosion, thermal fatigue, and high- and low-cycle fatigue. The inspection of rotor rim areas typically takes place more regularly during hot-gas-path and major maintenance intervals when casings and blades are removed....

2011-11-14T23:59:59.000Z

176

Control for stabilizing the alignment position of the rotor of a synchronous motor  

DOE Patents (OSTI)

A method and apparatus for damping oscillations in the rotor load angle of a synchronous motor to provide stable rotational alignment in high precision applications. The damping method includes sensing the angular position of the rotor and utilizing the position signal to generate an error signal in response to changes in the period of rotation of the rotor. The error signal is coupled to phase shift amplifiers which shift the phase of the motor drive signal in a direction to damp out the oscillations in the rotor load angle.

Donley, Lawrence I. (Lemont, IL)

1988-01-01T23:59:59.000Z

177

Modeling And Analysis of Radial Flux Toroidally Wound Twin Rotor Permanent Magnet Motor.  

E-Print Network (OSTI)

??The main objective of current thesis is the study of Radial Flux Twin Rotor Permanent Magnet (RFTWTRPM) motor. The tasks were to review the literature… (more)

Pratapa, Ravi Kishore

2010-01-01T23:59:59.000Z

178

Turning Waste Heat into Power: Ener-G-Rotors and the Entrepreneurial  

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

Turning Waste Heat into Power: Ener-G-Rotors and the Turning Waste Heat into Power: Ener-G-Rotors and the Entrepreneurial Mentorship Program Turning Waste Heat into Power: Ener-G-Rotors and the Entrepreneurial Mentorship Program March 16, 2011 - 4:55pm Addthis Ener-G-Rotors' 5kW prototype system | courtesy of Ener-G-Rotors Ener-G-Rotors' 5kW prototype system | courtesy of Ener-G-Rotors April Saylor April Saylor Former Digital Outreach Strategist, Office of Public Affairs If you've ever driven by an industrial plant, you've probably noticed big white plumes rising from the tops of the facilities. While it might look like smoke or pollution at first glance, most of the time those white plumes are comprised of steam and heat, or what Ener-G-Rotors CEO Michael Newell calls waste heat. Mike and the researchers of Ener-G-Rotors are finding ways to use this

179

Initial rotor position estimation for low saliency interior permanent-magnet synchronous motor drives.  

E-Print Network (OSTI)

??This work presents an initial rotor position estimation method for low saliency interior permanent-magnet synchronous motor (IPMSM) drives. The method injects signals into the stationary… (more)

Yang, Yan.

2010-01-01T23:59:59.000Z

180

Study on Performance Characteristics of Interior Permanent Magnet Synchronous Motor Due to Rotor Configuration.  

E-Print Network (OSTI)

??This research study was conducted in an effort to understand what effects the rotor configuration has on the performance of a permanent magnet synchronous machine,… (more)

Kettlewell, James

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Control for stabilizing the alignment position of the rotor of the synchronous motor  

DOE Patents (OSTI)

A method and apparatus is described for damping oscillations in the rotor load angle of a synchronous motor to provide stable rotational alignment in high precision applications. The damping method includes sensing the angular position of the rotor and utilizing the position signal to generate an error signal in response to changes in the period of rotation of the rotor. The error signal is coupled to phase shift amplifiers which shift the phase of the motor drive signal in a direction to damp out the oscillations in the rotor load angle.

Donley, L.I.

1985-03-12T23:59:59.000Z

182

Tuning thermal mismatch between turbine rotor parts with a thermal medium  

DOE Patents (OSTI)

In a turbine rotor, an aft shaft wheel and the final-stage wheel of the rotor are coupled together, including by a rabbeted joint. During shutdown and startup of the turbine, a thermal mismatch between the aft shaft wheel and final-stage wheel is avoided by respectively heating and cooling the aft shaft wheel to maintain the thermal mismatch within acceptable limits, thereby avoiding opening of the rabbeted joint and the potential for unbalancing the rotor and rotor vibration. The thermal medium may be supplied by piping in the aft bearing cavity into the cavity between the forward closure plate and the aft shaft wheel.

Schmidt, Mark Christopher (Niskayuna, NY)

2001-01-01T23:59:59.000Z

183

Aero-Structural Optimization of a 5 MW Wind Turbine Rotor.  

E-Print Network (OSTI)

??A 5 MW wind turbine rotor blade based on the NREL 5 MW Reference Turbine is optimized for maximum efficiency and minimum flapwise hub bending… (more)

Vesel, Richard W., Jr.

2012-01-01T23:59:59.000Z

184

Decoherence without classicality in the resonant quantum kicked rotor  

E-Print Network (OSTI)

We study the quantum kicked rotor in resonance subjected to an unitary noise defined through Kraus operators, we show that this type of decoherence does not, in general, lead to the classical diffusive behavior. We find exact analytical expressions for the density matrix and the variance in the primary resonances. The variance does not loose its ballistic behavior, however the coherence decays as a power law. The secondary resonances are treated numerically, obtaining a power-law decay for the variance and an exponential law decay for the coherence.

A. Romanelli

2009-05-05T23:59:59.000Z

185

Saturation of fidelity in the atom-optics kicked rotor  

E-Print Network (OSTI)

We show that the quantum fidelity is accessible to cold atom experiments for a large class of evolutions in periodical potentials, properly taking into account the experimental initial conditions of the atomic ensemble. We prove analytically that, at the fundamental quantum resonances of the atom-optics kicked rotor, the fidelity saturates at a constant, time-independent value after a small number of kicks. The latter saturation arises from the bulk of the atomic ensemble, whilst for the resonantly accelerated atoms the fidelity is predicted to decay slowly according to a power law.

Sandro Wimberger; Andreas Buchleitner

2006-03-10T23:59:59.000Z

186

Classical diffusive dynamics for the quasiperiodic kicked rotor  

E-Print Network (OSTI)

We study the classical dynamics of a quasiperiodic kicked rotor, whose quantum counterpart is known to be an equivalent of the 3D Anderson model. Using this correspondence allowed for a recent experimental observation of the Anderson transition with atomic matter waves. In such a context, it is particularly important to assert the chaotic character of the classical dynamics of this system. We show here that it is a 3D anisotropic diffusion. Our simple analytical predictions for the associated diffusion tensor are found in good agreement with the results of numerical simulations.

Gabriel Lemarié; Dominique Delande; Jean Claude Garreau; Pascal Szriftgiser

2010-03-23T23:59:59.000Z

187

Anomalous diffusion in the resonant quantum kicked rotor  

E-Print Network (OSTI)

We study the resonances of the quantum kicked rotor subjected to an excitation that follows a deterministic time-dependent prescription. For the primary resonances we find an analytical relation between the long-time behavior of the standard deviation and the external kick strength. For the secondary resonances we obtain essentially the same result numerically. Selecting the time sequence of the kick allows to obtain a variety of asymptotic wave-function spreadings: super-ballistic, ballistic, sub-ballistic, diffusive, sub-diffusive and localized.

A. Romanelli; Guzmán Hernández

2009-08-31T23:59:59.000Z

188

Neural Network Based Modeling of a Large Steam Turbine-Generator Rotor Body Parameters from On-Line Disturbance Data  

E-Print Network (OSTI)

Neural Network Based Modeling of a Large Steam Turbine-Generator Rotor Body Parameters from On technique to estimate and model rotor- body parameters of a large steam turbine-generator from real time

189

Neuro-fuzzy modeling tools for estimation of torque in Savonius rotor wind turbine  

Science Conference Proceedings (OSTI)

In the present paper, the ability and accuracy of an adaptive neuro-fuzzy inference system (ANFIS) has been investigated for dynamic modeling of wind turbine Savonius rotor. The main objective of this research is to predict torque performance as a function ... Keywords: ANFIS, ANN, BP, FIS, LSE, MSE, Max, Min, Modeling, Prob, Prod, RBF, RMSE, SD, Savonius rotor, Torque

J. Sargolzaei; A. Kianifar

2010-04-01T23:59:59.000Z

190

Wind Profiler Observations of Mountain Waves and Rotors during T-REX  

Science Conference Proceedings (OSTI)

A network of three boundary layer radar wind profilers is used to study characteristics of mountain waves and rotors and to explore the utility of such a network. The data employed were collected as part of the Terrain-Induced Rotor Experiment (T-...

Stephen A. Cohn; Vanda Grubiši?; William O. J. Brown

2011-04-01T23:59:59.000Z

191

Rotor power feedback control of wind turbine system doubly-fed induction generator  

Science Conference Proceedings (OSTI)

The paper deals with a new system of wind turbine active power vector control. The already familiar cascade regulation with internal vector component feedback of rotor current and external active and reactive power feedbacks control of wind turbine has ... Keywords: DFIG rotor power regulator, doubly-fed induction generator, simulation, vector control

J. Smajo

2006-09-01T23:59:59.000Z

192

The Influence of Support Rods on the Rotation Speed of Savonius Rotors  

Science Conference Proceedings (OSTI)

When a Savonius rotor is used on a current meter as a sensor for fluid speed, it is usually surrounded by a number of support rods. These rods interfere with the flow to the rotor and, depending on their orientation to the flow, can be found to ...

H. D. Pite

1986-09-01T23:59:59.000Z

193

Chirality in odd-$A$ nucleus $^{135}$Nd in particle rotor model  

E-Print Network (OSTI)

A particle rotor model is developed which couples several valence protons and neutrons to a rigid triaxial rotor core. It is applied to investigating the chirality in odd-$A$ nucleus $^{135}$Nd with $\\pi h_{11/2}^2\\otimes\

B. Qi; S. Q. Zhang; J. Meng; S. Y. Wang; S. Frauendorf

2008-12-25T23:59:59.000Z

194

Chirality in odd-$A$ nucleus $^{135}$Nd in particle rotor model  

E-Print Network (OSTI)

A particle rotor model is developed which couples several valence protons and neutrons to a rigid triaxial rotor core. It is applied to investigating the chirality in odd-$A$ nucleus $^{135}$Nd with $\\pi h_{11/2}^2\\otimes\

Qi, B; Meng, J; Wang, S Y; Frauendorf, S

2008-01-01T23:59:59.000Z

195

Fractal Fault Diagnosis of Rotor System Based on Morphological De-nosing  

Science Conference Proceedings (OSTI)

As an experimental tool for analyzing movement of chaos, we intend to introduce the correlation dimension for analyzing vibration signals of rotor system in this paper. For noise corruption existing in field-measured vibration signal, morphological filter ... Keywords: Rotor system, fractal, fault Diagnosis, correlation dimension, morphological filter

Bi-qiang Du; Gui-ji Tang; Song-ling Wang

2008-05-01T23:59:59.000Z

196

Typical fault mode determination for rotor test rig based on correlation dimension and Kolmogorov entropy  

Science Conference Proceedings (OSTI)

This paper experimentally investigates the vibration faults of rotor, such as the unbalance, the loosening and the friction, using the rotor test rig. According to the theory of fractal and chaos, the vibration signal series are reconstructed. By the ... Keywords: Kolmogorov entropy, correlation dimension, fractal and chaos, vibration fault

Fengling Zhang; Yanting Ai; Fei Liu

2009-08-01T23:59:59.000Z

197

Computationally fast harmonic balance methods for unsteady aerodynamic predictions of helicopter rotors  

Science Conference Proceedings (OSTI)

A harmonic balance technique for the analysis of unsteady flows about helicopter rotors in forward flight and hover is presented in this paper. The aerodynamics of forward flight are highly nonlinear, with transonic flow on the advancing blade, subsonic ... Keywords: Computational fluid dynamics, Frequency-domain methods, Harmonic balance technique, Helicopter rotors, Unsteady aerodynamics

Kivanc Ekici; Kenneth C. Hall; Earl H. Dowell

2008-06-01T23:59:59.000Z

198

Advanced Flywheel Composite Rotors: Low-Cost, High-Energy Density Flywheel Storage Grid Demonstration  

SciTech Connect

GRIDS Project: Boeing is developing a new material for use in the rotor of a low-cost, high-energy flywheel storage technology. Flywheels store energy by increasing the speed of an internal rotor —slowing the rotor releases the energy back to the grid when needed. The faster the rotor spins, the more energy it can store. Boeing’s new material could drastically improve the energy stored in the rotor. The team will work to improve the storage capacity of their flywheels and increase the duration over which they store energy. The ultimate goal of this project is to create a flywheel system that can be scaled up for use by electric utility companies and produce power for a full hour at a cost of $100 per kilowatt hour.

None

2010-10-01T23:59:59.000Z

199

Evaluation of 2 Percent CrMoWV HP/LP Rotor Gap Forging for Single Cylinder Steam Turbine Use  

Science Conference Proceedings (OSTI)

There has been considerable industry interest in developing a single shaft rotor configuration that uses the same rotor in the high-pressure (HP) as well as the Low Pressure (LP) sections of a steam turbine. This report evaluates an HP/LP rotor forging for single cylinder steam turbines.

1998-11-24T23:59:59.000Z

200

Dynamic Response of a Rotor-air Bearing System Due to Base Induced Periodic Motions  

E-Print Network (OSTI)

Oil-free microturbomachinery (MTM) are inevitably subjected to base or foundation excitations: multiple periodic load excitations from internal combustion (IC) engines in turbochargers, for example. Too large base excitations can produce severe damage, even failure, due to hard collision or rubbing contact between a rotor and its bearings. Therefore, it is paramount to evaluate the reliability of rotor-air bearing systems to withstanding base load excitations. In 2008, intermittent shock excitations, up to 30 g (pk-pk), were introduced to a test rig consisting of a rotor (0.825 kg) supported on two hybrid flexure pivot tilting pad gas bearings (FPTPBs). The experiments demonstrated the reliability of the gas bearings to withstanding external transient load excitations. Presently, a shaker delivers periodic load excitations to the base plate supporting the test rig. The whole system, weighing 48 kg, is supported on two soft coil springs and its lowest natural frequency is ~5 Hz. The rod connecting the shaker to the base plate is not affixed rigidly to the test rig base. The rod merely pushes on the base plate and hence the induced based motions are intermittent with multiple impacts and frequencies. As with most practical conditions, the base motion frequencies (5-12 Hz) are low respective to the operating speed of the rotor-bearing system. Rotor speed coast down tests evidence the rotor-bearing system natural frequency when the gas bearings are supplied with feed pressures increasing from 2.36 to 5.08 bar (ab). Shaker excitation induced rotor response, relative to the bearing housings, contains the main input frequency (5-12 Hz) and its super harmonics; and because of the intermittency of the base motions, it also excites the rotor-bearing system natural frequency, with smaller motion amplitudes than synchronous motion components. The excitation of the system natural frequency does not mean rotordynamic instability. With base induced motions, the rotor motion amplitude at the system natural frequency increases as the gas bearing feed pressure decreases, as the rotor speed increases, and as the shaker input excitation frequency increases (5-12 Hz). Hence, the test rotor-air bearing system is highly sensitive to base motions, intermittent in character, in particular when the gas bearings are supplied with a low feed pressure. Predicted rotor motion responses obtained from XLTRC2 and an analytical rigid rotor model, both including the (measured) periodic base motions, show good correlation with the measurements. The research results demonstrate further the applicability of gas bearings into oil-free high speed MTM.

Niu, Yaying

2009-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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.


201

Assembly for facilitating inservice inspection of a reactor coolant pump rotor  

DOE Patents (OSTI)

A reactor coolant pump has an outer casing with an internal cavity holding a coolant and a rotor rotatably mounted in the cavity within the coolant. An assembly for permitting inservice inspection of the pump rotor without first draining the coolant from the casing cavity is attached to an end of the pump. A cylindrical bore is defined through the casing in axial alignment with an end of pump rotor and opening into the internal cavity. An extension attached on the rotor end and rotatable therewith has a cylindrical coupler member extending into the bore. An outer end of the coupler member has an element configured to receive a tool for performance of inservice rotor inspection. A hollow cylindrical member is disposed in the bore and surrounds the coupler member. The cylindrical member is slidably movable relative to the coupler member along the bore between a retracted position wherein the cylindrical member is stored for normal pump operation and an extended position wherein the cylindrical member is extended for permitting inservice rotor inspection. A cover member is detachably and sealably attached to the casing across the bore for closing the bore and retaining the cylindrical member at its retracted position for normal pump operation. Upon detachment of the cover member, the cylindrical member can be extended to permit inservice rotor inspection.

Veronesi, Luciano (O' Hara Township, Allegheny County, PA)

1990-01-01T23:59:59.000Z

202

Quantum ether: photons and electrons from a rotor model  

E-Print Network (OSTI)

We give an example of a purely bosonic model -- a rotor model on the 3D cubic lattice -- whose low energy excitations behave like massless U(1) gauge bosons and massless Dirac fermions. This model can be viewed as a ``quantum ether'': a medium that gives rise to both photons and electrons. It illustrates a general mechanism for the emergence of gauge bosons and fermions known as ``string-net condensation.'' Other, more complex, string-net condensed models can have excitations that behave like gluons, quarks and other particles in the standard model. This suggests that photons, electrons and other elementary particles may have a unified origin: string-net condensation in our vacuum.

Michael Levin; Xiao-Gang Wen

2005-07-13T23:59:59.000Z

203

Rigid Rotor as a Toy Model for Hodge Theory  

E-Print Network (OSTI)

We apply the superfield approach to the toy model of a rigid rotor and show the existence of the nilpotent and absolutely anticommuting Becchi-Rouet-Stora-Tyutin (BRST) and anti-BRST symmetry transformations, under which, the kinetic term and action remain invariant. Furthermore, we also derive the off-shell nilpotent and absolutely anticommuting (anti-) co-BRST symmetry transformations, under which, the gauge-fixing term and Lagrangian remain invariant. The anticommutator of the above nilpotent symmetry transformations leads to the derivation of a bosonic symmetry transformation, under which, the ghost terms and action remain invariant. Together, the above transformations (and their corresponding generators) respect an algebra that turns out to be a physical realization of the algebra obeyed by the de Rham cohomological operators of differential geometry. Thus, our present model is a toy model for the Hodge theory.

Saurabh Gupta; R. P. Malik

2009-10-15T23:59:59.000Z

204

Cooling system for a bearing of a turbine rotor  

SciTech Connect

In a gas turbine, a bore tube assembly radially inwardly of an aft bearing conveys cooling steam to the buckets of the turbine and returns the cooling steam to a return. To cool the bearing and thermally insulate the bearing from the cooling steam paths, a radiation shield is spaced from the bore tube assembly by a dead air gap. Additionally, an air passageway is provided between the radiation shield and the inner surface of an aft shaft forming part of the rotor. Air is supplied from an inlet for flow along the passage and radially outwardly through bores in the aft shaft disk to cool the bearing and insulate it from transfer of heat from the cooling steam.

Schmidt, Mark Christopher (Niskayuna, NY)

2002-01-01T23:59:59.000Z

205

Final project report: High energy rotor development, test and evaluation  

DOE Green Energy (OSTI)

Under the auspices of the {open_quotes}Government/Industry Wind Technology Applications Project{close_quotes} [{open_quotes}Letter of Interest{close_quotes} (LOI) Number RC-1-11101], Flo Wind Corp. has successfully developed, tested, and delivered a high-energy rotor upgrade candidate for their 19-meter Vertical Axis Wind Turbine. The project included the demonstration of the innovative extended height-to-diameter ratio concept, the development of a continuous span single-piece composite blade, the demonstration of a continuous blade manufacturing technique, the utilization of the Sandia National Laboratories developed SNLA 2150 natural laminar flow airfoil and the reuse of existing wind turbine and wind power plant infrastructure.

NONE

1996-09-01T23:59:59.000Z

206

Assessment of research needs for wind turbine rotor materials technology  

DOE Green Energy (OSTI)

Wind-driven power systems is a renewable energy technology that is still in the early stages of development. Wind power plants installed in early 1980s suffered structural failures chiefly because of incomplete understanding of wind forces (turbulent), in some cases because of poor product quality. Failures of rotor blades are now somewhat better understood. This committee has examined the experience base accumulated by wind turbines and the R and D programs sponsored by DOE. It is concluded that a wind energy system such as is described is within the capability of engineering practice; however because of certain gaps in knowledge, and the presence of only one major integrated manufacturer of wind power machines in the USA, a DOE R and D investment is still required.

Not Available

1991-01-01T23:59:59.000Z

207

WindPACT Turbine Rotor Design Study: June 2000--June 2002 (Revised)  

SciTech Connect

This report presents the results of the turbine rotor study completed by Global Energy Concepts (GEC) as part of the U.S. Department of Energy's WindPACT (Wind Partnership for Advanced Component Technologies) project. The purpose of the WindPACT project is to identify technology improvements that will enable the cost of energy from wind turbines to fall to a target of 3.0 cents/kilowatt-hour in low wind speed sites. The study focused on different rotor configurations and the effect of scale on those rotors.

Malcolm, D. J.; Hansen, A. C.

2006-04-01T23:59:59.000Z

208

Rotor Spectra, Berry Phases, and Monopole Fields: from Antiferromagnets to QCD  

E-Print Network (OSTI)

The order parameter of a finite system with a spontaneously broken continuous global symmetry acts as a quantum mechanical rotor. Both antiferromagnets with a spontaneously broken $SU(2)_s$ spin symmetry and massless QCD with a broken $SU(2)_L \\times SU(2)_R$ chiral symmetry have rotor spectra when considered in a finite volume. When an electron or hole is doped into an antiferromagnet or when a nucleon is propagating through the QCD vacuum, a Berry phase arises from a monopole field and the angular momentum of the rotor is quantized in half-integer units.

S. Chandrasekharan; F. -J. Jiang; M. Pepe; U. -J. Wiese

2006-12-11T23:59:59.000Z

209

Guidelines for the Uprate Design of Turbine-Generator Rotor Support Systems  

Science Conference Proceedings (OSTI)

The focus of this guidelines document is the rotor support structure for uprated turbine-generator (T/G) systems. The overall objective of the guidelines is to provide utility personnel with the guidance needed to validate the design of the components prior to a plant uprate/upgrade to ensure that the unit will operate without unplanned and unanticipated issues related to the rotor bearings, bearing support structures, and pedestals. The guidelines are applicable to both nuclear and fossil T/G rotor supp...

2011-12-23T23:59:59.000Z

210

Non-linear dynamic of rotor-stator system with non-linear bearing clearance  

E-Print Network (OSTI)

The study deals with a rotor-stator contact inducing vibration in rotating machinery. A numerical rotor-stator system, including a non-linear bearing with Hertz contact and clearance is considered. To determine the non-linear responses of this system, non-linear dynamic equations can be integrated numerically. However, this procedure is both time consuming and costly to perform. The aim of this Note is to apply the Alternate Frequency/Time Method and the 'path following continuation' in order to obtain the non-linear responses to this problem. Then the orbits of rotor and stator responses at various speeds are investigated.

Jean-Jacques Sinou; Fabrice Thouverez

2008-01-19T23:59:59.000Z

211

Non-linear dynamic of rotor-stator system with non-linear bearing clearance  

E-Print Network (OSTI)

The study deals with a rotor-stator contact inducing vibration in rotating machinery. A numerical rotor-stator system, including a non-linear bearing with Hertz contact and clearance is considered. To determine the non-linear responses of this system, non-linear dynamic equations can be integrated numerically. However, this procedure is both time consuming and costly to perform. The aim of this Note is to apply the Alternate Frequency/Time Method and the 'path following continuation' in order to obtain the non-linear responses to this problem. Then the orbits of rotor and stator responses at various speeds are investigated.

Sinou, Jean-Jacques

2008-01-01T23:59:59.000Z

212

Axial thermal medium delivery tubes and retention plates for a gas turbine rotor  

SciTech Connect

In a multi-stage turbine rotor, tubes are disposed in openings adjacent the rotor rim for flowing a thermal medium to rotor buckets and returning spent thermal medium. The tubes have axially spaced lands of predetermined wall thickness with thin-walled tube sections between the lands and of increasing thickness from the forward to the aft ends of the tubes. A pair of retention plates are carried on the aft end face of the aft wheel and straddle the tube and engage against a shoulder on the tube to preclude displacement of the tube in an aft direction.

Mashey, Thomas Charles (Coxsackie, NY)

2002-01-01T23:59:59.000Z

213

WindPACT Turbine Rotor Design Study: June 2000--June 2002 (Revised)  

DOE Green Energy (OSTI)

This report presents the results of the turbine rotor study completed by Global Energy Concepts (GEC) as part of the U.S. Department of Energy's WindPACT (Wind Partnership for Advanced Component Technologies) project. The purpose of the WindPACT project is to identify technology improvements that will enable the cost of energy from wind turbines to fall to a target of 3.0 cents/kilowatt-hour in low wind speed sites. The study focused on different rotor configurations and the effect of scale on those rotors.

Malcolm, D. J.; Hansen, A. C.

2006-04-01T23:59:59.000Z

214

An Experimental Study of the Sensitivity of Helicopter Rotor Blade Tracking . . .  

E-Print Network (OSTI)

(Maximum 200 words) The sensitivity of blade tracking in hover to variations in root pitch was examined for two rotor configurations. Tests were conducted using a four-bladed articulated rotor mounted on the NASA-Army aeroelastic rotor experimental system (ARES). Two rotor configurations were tested: one consisting of a blade set with flexible fiberglass spars and one with stiffer (by a factor of five in flapwise and torsional stiffnesses) aluminum spars. Both blade sets were identical in planform and airfoil distribution and were untwisted. The two configurations were ballasted to the same Lock number so that a direct comparison of the tracking sensitivity to a gross change in blade stiffness could be made. Experimental results show no large differences between the two sets of blades in the sensitivity of the blade tracking to root pitch adjustments. However, a measurable reduction in in-track coning of the fiberglass spar blades with respect to the aluminum blades is noted at higher...

W. Keats Wilkie; Omb No; Jeffrey D. Singleton; Matthew L. Wilbur; William T. Yeager; Aerostructures Directorate

1991-01-01T23:59:59.000Z

215

The cost of noise reduction for departure and arrival operations of commercial tilt rotor aircraft  

E-Print Network (OSTI)

The relationship between direct operating cost (DOC) and noise annoyance due to a departure and an arrival operation was developed for commercial tilt rotor aircraft. This was accomplished by generating a series of tilt ...

Faulkner, Henry B.

1976-01-01T23:59:59.000Z

216

Chiral bands for quasi-proton and quasi-neutron coupling with a triaxial rotor  

E-Print Network (OSTI)

A particle rotor model (PRM) with a quasi-proton and a quasi-neutron coupled with a triaxial rotor is developed and applied to study chiral doublet bands with configurations of a $h_{11/2}$ proton and a $h_{11/2}$ quasi-neutron. With pairing treated by the BCS approximation, the present quasi-particle PRM is aimed at simulating one proton and many neutron holes coupled with a triaxial rotor. After a detailed analysis of the angular momentum orientations, energy separation between the partner bands, and behavior of electromagnetic transitions, for the first time we find aplanar rotation or equivalently chiral geometry beyond the usual one proton and one neutron hole coupled with a triaxial rotor.

S. Q. Zhang; B. Qi; S. Y. Wang; J. Meng

2007-03-15T23:59:59.000Z

217

Geometric Integration of Non-autonomous Systems with Application to Rotor Dynamics  

E-Print Network (OSTI)

Geometric integration of non-autonomous classical engineering problems, such as rotor dynamics, is investigated. It is shown, both numerically and by backward error analysis, that geometric (structure preserving) integration algorithms are superior to conventional Runge-Kutta methods.

Modin, Klas

2011-01-01T23:59:59.000Z

218

Chirality in odd-$A$ Rh isotopes within triaxial particle rotor model  

E-Print Network (OSTI)

Adopting the fully quantal triaxial particle rotor model, the candidate chiral doublet bands in odd-$A$ nuclei $^{103}$Rh and $^{105}$Rh with $\\pi g_{9/2}^{-1}\\otimes\

B. Qi; S. Q. Zhang; S. Y. Wang; J. Meng; T. Koike

2011-02-11T23:59:59.000Z

219

Observation of coherence revival and fidelity saturation in a delta-kicked rotor potential  

E-Print Network (OSTI)

We experimentally investigate the effect of atomic delta-kicked rotor potentials on the mutual coherence between wavepackets in an atom interferometer. The differential action of the kicked rotor degrades the mutual coherence, leading to a reduction of the interferometry fringe visibility; however, when the repetition rate of the kicked rotor is at or near the quantum resonance, we observe revival of matter-wave coherence as the number of kicks increases, resulting in non-vanishing coherence in the large kick number limit. This coherence saturation effect reflects a fidelity saturation in phase-space displacement echoes in deep quantum regime. The saturation effect is accompanied with an invariant distribution of matter-wave coherence under the kicked rotor perturbations.

Wu, Saijun; Prentiss, Mara G

2008-01-01T23:59:59.000Z

220

Assessment of Slag-Aided Deoxidation Process in 3.5crmov Rotor ...  

Science Conference Proceedings (OSTI)

Presentation Title, Assessment of Slag-Aided Deoxidation Process in 3.5crmov Rotor Steel. Author(s), June-Seong Park, Chang-Woo Seo, Seonhyo Kim.

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Deflection Shape Reconstructions of a Rotating Five-blade Helicopter Rotor from TLDV Measurements  

Science Conference Proceedings (OSTI)

Helicopters are aircraft machines which are subjected to high level of vibrations, mainly due to spinning rotors. These are made of two or more blades attached by hinges to a central hub, which can make the dynamic behaviour difficult to study. However, they share some common dynamic properties with the ones expected in bladed discs, thereby the analytical modelling of rotors can be performed using some assumptions as the ones adopted for the bladed discs. This paper presents results of a vibrations study performed on a scaled helicopter rotor model which was rotating at a fix rotational speed and excited by an air jet. A simplified analytical model of that rotor was also produced to help the identifications of the vibration patterns measured using a single point tracking-SLDV measurement method.

Fioretti, A.; Castellini, P.; Tomasini, E. P. [Universita Politecnica delle Marche, Dipartimento di Meccanica, Ancona (Italy); Di Maio, D.; Ewins, D. J. [University of Bristol, Aerospace Department, Bristol (United Kingdom)

2010-05-28T23:59:59.000Z

222

Diurnal Variation of Downslope Winds in Owens Valley during the Sierra Rotor Experiment  

Science Conference Proceedings (OSTI)

The impact of diurnal forcing on a downslope wind event that occurred in Owens Valley in California during the Sierra Rotors Project (SRP) in the spring of 2004 has been examined based on observational analysis and diagnosis of numerical ...

Qingfang Jiang; James D. Doyle

2008-10-01T23:59:59.000Z

223

Observation of coherence revival and fidelity saturation in a delta-kicked rotor potential  

E-Print Network (OSTI)

We experimentally investigate the effect of atomic $\\delta$-kicked rotor potentials on the mutual coherence between wavepackets in an atom interferometer. The differential action of the kicked rotor degrades the mutual coherence, leading to a reduction of the interferometry fringe visibility; however, when the repetition rate of the kicked rotor is at or near the quantum resonance, we observe revival of matter-wave coherence as the number of kicks increases, resulting in non-vanishing coherence in the large kick number limit. This coherence saturation effect reflects a saturation of fidelity decay due to momentum displacements in deep quantum regime. The saturation effect is accompanied with an invariant distribution of matter-wave coherence under the kicked rotor perturbations.

Saijun Wu; Alexey Tonyushkin; Mara G. Prentiss

2008-01-03T23:59:59.000Z

224

High-Resolution Doppler Lidar Observations of Transient Downslope Flows and Rotors  

Science Conference Proceedings (OSTI)

The authors present observations of the temporal evolution of downslope windstorms with rotors and internal hydraulic jumps of unprecedented detail and spatiotemporal coverage. The observations were carried out by means of a coherent Doppler lidar ...

Christian Kühnlein; Andreas Dörnbrack; Martin Weissmann

2013-10-01T23:59:59.000Z

225

Rotor and Subrotor Dynamics in the Lee of Three-Dimensional Terrain  

Science Conference Proceedings (OSTI)

The internal structure and dynamics of rotors that form in the lee of topographic ridges are explored using a series of high-resolution eddy-resolving numerical simulations. Surface friction generates a sheet of horizontal vorticity along the lee ...

James D. Doyle; Dale R. Durran

2007-12-01T23:59:59.000Z

226

Effects of rotor tip clearance on an embedded compressor stage performance  

E-Print Network (OSTI)

Compressor efficiency variation with rotor tip gap is assessed using numerical simulations on an embedded stage representative of that in a large industrial gas turbine with Reynolds number being approximately 2 x 106 to ...

Sakulkaew, Sitanun

2012-01-01T23:59:59.000Z

227

Evaluation of the AEA Technology Engineering Services AIS Rotor Bore Ultrasonic Imaging System  

Science Conference Proceedings (OSTI)

Reliable and repeatable boresonic inspections of turbine rotors and generator fields are critical for accurately predicting the remaining life of those components. EPRI's boresonic system evaluation program provides utilities with insight into the capability of commercial boresonic system performance. This report features an evaluation of the Automated Inspection System (AIS) Rotor Bore Ultrasonic Imaging System, a boresonic system owned and operated by AEA Technology Engineering Services.

2006-06-05T23:59:59.000Z

228

Stabilized space---time computation of wind-turbine rotor aerodynamics  

Science Conference Proceedings (OSTI)

We show how we use the Deforming-Spatial-Domain/Stabilized Space---Time (DSD/SST) formulation for accurate 3D computation of the aerodynamics of a wind-turbine rotor. As the test case, we use the NREL 5MW offshore baseline wind-turbine rotor. This class ... Keywords: DSD/SST formulation, Rotating turbulent flow, Space---time variational multiscale method, Torque values, Wind-turbine aerodynamics

Kenji Takizawa; Bradley Henicke; Tayfun E. Tezduyar; Ming-Chen Hsu; Yuri Bazilevs

2011-09-01T23:59:59.000Z

229

Control system for a wound-rotor motor  

DOE Patents (OSTI)

A load switching circuit for switching two or more transformer taps under load carrying conditions includes first and second parallel connected bridge rectifier circuits which control the selective connection of a direct current load to taps of a transformer. The first bridge circuit is normally conducting so that the load is connected to a first tap through the first bridge circuit. To transfer the load to the second tap, a switch is operable to connect the second bridge circuit to a second tap, and when the second bridge circuit begins to conduct, the first bridge circuit ceases conduction because the potential at the second tap is higher than the potential at the first tap, and the load is thus connected to the second tap through the second bridge circuit. The load switching circuit is applicable in a motor speed controller for a wound-rotor motor for effecting tap switching as a function of motor speed while providing a stepless motor speed control characteristics.

Ellis, J.N.

1981-07-17T23:59:59.000Z

230

Control system for a wound-rotor motor  

DOE Patents (OSTI)

A load switching circuit for switching two or more transformer taps under load carrying conditions includes first and second parallel connected bridge rectifier circuits which control the selective connection of a direct current load to taps of a transformer. The first bridge circuit is normally conducting so that the load is connected to a first tap through the first bridge circuit. To transfer the load to the second tap, a switch is operable to connect the second bridge circuit to a second tap, and when the second bridge circuit begins to conduct, the first bridge circuit ceases conduction because the potential at the second tap is higher than the potential at the first tap, and the load is thus connected to the second tap through the second bridge circuit. The load switching circuit is applicable in a motor speed controller for a wound-rotor motor for effecting tap switching as a function of motor speed while providing a stepless motor speed control characteristic.

Ellis, James N. (Chatsworth, CA)

1983-01-01T23:59:59.000Z

231

RAMGEN ROTOR CARTRIDGE FOR THE PRE-PROTOTYPE RAMGEN ENGINE  

Science Conference Proceedings (OSTI)

The research and development of a unique combustion engine is presented. The engine converts the thrust from ramjet modules located on the rim of a disk into shaft torque, which in turn can be used for electrical power generation or mechanical drive applications. A test program was undertaken that included evaluation of the pre-prototype engine and incorporation of improvements to the thrust modules and supporting systems. Fuel mixing studies with vortex generators and bluff body flame holders demonstrated the importance of increasing the shear-layer area and spreading angle to augment flame volume. Evaluation of flame-holding configurations (with variable fuel injection methods) concluded that the heat release zone, and therefore combustion efficiency, could be manipulated by judicious selection of bluff body geometry, and is less influenced by fuel injection distribution. Finally, successful operation of novel fuel and cooling air delivery systems have resolved issues of gas (fuel and air) delivery to the individual rotor segments. The lessons learned from the pre-prototype engine are currently being applied to the development of a 2.8MW engine.

Aaron Koopman

2003-09-01T23:59:59.000Z

232

Designing an H-rotor type Wind Turbine for Operation on Amundsen-Scott South Pole Station.  

E-Print Network (OSTI)

?? This thesis focuses on designing the turbine, tower structure and generator for an H-rotor type wind turbine. The produced power will be used for… (more)

Wahl, Mats

2007-01-01T23:59:59.000Z

233

Characteristics of wind power on Savonius rotor using a guide-box tunnel  

Science Conference Proceedings (OSTI)

This study investigates to improve and adjust the output power of Savonius rotor under various wind power and suggests the method of prevention the rotor from strong wind disaster. In this study, as the appropriate device to achieve the purpose of it, a guide-box tunnel is employed. The guide-box tunnel is like a rectangular box as wind passage in which a test rotor is included. The area ratio between the inlet and exit of it is variable to adjust the inlet mass flow rate or input power. At first, the experiment was conducted to find the adequate configuration which would provide the best relative performance. The present experiment, however, does not include the test to retain the guide-box tunnel from the strong wind. The experiments include the static torque test of the fixed rotor at any phase angle and the dynamic torque test at rotation of them. Consequently, it was found that the maximum rotor rotational speed was achieved in the range of the guide-box area ratio between 0.3 and 0.7 and the value of the output power coefficient of the rotor with guide-box tunnel of the area ratio 0.43 increases about 1.5 times with three blades and 1.23 times with two blades greater than that without guide-box tunnel, respectively. It seemed that the performance of Savonius rotor within the guide-box tunnel is comparable enough with other methods for augmentation and control of the output. (author)

Irabu, Kunio; Roy, Jitendro Nath [Faculty of Mechanical Engineering, University of the Ryukyus, Senbaru-1, Nishihara, Okinawa 903-0213 (Japan)

2007-11-15T23:59:59.000Z

234

Segmented Ultralight Pre-Aligned Rotor for Extreme-Scale Wind Turbines  

SciTech Connect

To alleviate the mass-scaling issues associated with conventional upwind rotors of extreme-scale turbines, a downwind rotor concept is proposed which employs fixed blade curvature based on force alignment at rated conditions. For a given peak stress constraint, the reduction in downwind cantilever loads allows reduced shell and spar thickness, and thus a reduced blade mass as compared with a conventional upwind rotor, especially as rotor sizes approach extreme-scales. To quantify this mass reduction, a Finite Element Analysis was conducted for a 10 MW rated rotor based on the NREL offshore 5 MW baseline wind turbine. The results show that this 'pre-alignment' yields a net downstream deflection of 32 deg, a downward hub-pitch angle of 6 deg, a 20% increase in blade length (to maintain the same radius as the conventional blade), and a net mass savings of about 50% through decreased shell and spar thicknesses. The pre-alignment may also allow a more straightforward and efficient segmentation of the blade since shear stresses near joints are substantially reduced. Segmenting, in turn, can dramatically reduce costs associated with fabrication, transport and assembly for extreme-scale off-shore systems. The pre-aligned geometric curvature can also help alleviate tower wake effects on the blades since blade tips (where shadow effects can be most problematic) are shifted downstream where the tower wake is weaker. In addition, the portion of the tower that is upstream of the blade tips can be faired with an externally-rotating aerodynamic shroud. Furthermore, the downwind rotor can allow a floating off-shore tri-pod platform to reduce tower weight and yaw-control requirements. A simple economic analysis of the segmented ultralight pre-aligned rotor (SUPAR) concept suggests that the overall system cost savings can be as much as 25%, indicating that more detailed (numerical and experimental) investigations are warranted.

Loth, E.; Steele, A.; Ichter, B.; Selig, M.; Moriarty, P.

2012-01-01T23:59:59.000Z

235

Experimental response of a rotor supported on Rayleigh step gas bearings  

E-Print Network (OSTI)

Gas bearings enable successful applications in high speed oil-free microturbomachinery. This thesis presents analysis and experiments of the dynamic performance of a rotor supported on Rayleigh step gas bearings. Comprehensive experiments demonstrate that Rayleigh step hybrid gas bearings exhibit adequate stiffness and damping capability in a narrow range of shaft speeds, up to ~ 20 krpm. Rotor coastdown responses were performed for two test bearing sets with nominal radial clearance of 25.4 ?m and 38.1 ?m, respectively. A near-frictionless carbon (NFC) coating was applied on the rotor to reduce friction against its bearings at liftoff and touchdown. However, the rotor still experienced dry friction at low shaft speeds (below ~ 4,000 rpm). Experiments show that the supply pressure raises the rotor critical speed and decreases the system damping ratio. The geometry of the Rayleigh steps distributed on the rotor surface generates a time varying pressure field and results in a sizable 4X super synchronous component of bearing transmitted load. The external supply gas pressure affects slightly the onset speed of instability of the rotor-bearing system. The unstable whirl frequencies are nearly fixed at the system natural frequency (~ 120 Hz). Analysis with a finite element model predicts the stiffness and damping force coefficients for the bearing accounting for a purely hydrodynamic operation condition. Predictions show the synchronous stiffness and damping coefficients decrease with shaft speed. Predicted threshold speeds of instability are lower, ~ 50% or less than the measurement due to the analytical model limitations assuming a grooved stator. The predicted synchronous responses to imbalance correlate well with the measurements, however. The Rayleigh step gas bearing shows similar characteristics to the flexure pivot tilting pad bearing (FPTPB) tested in 2003. However, the test Rayleigh step gas bearings exhibit a much reduced stable operating speed range, below 20 krpm. The maximum speed achieved is much lower to that determined with an identical rotor supported on FPTPBs, i.e. rotor dynamically stable up to 100 krpm. The FPTPB is more reliable in high speed oil-free applications due to its excellent stability characteristics.

Zhu, Xuehua

2004-08-01T23:59:59.000Z

236

Using time-frequency and wavelet analysis to assess turbulence/rotor interactions  

DOE Green Energy (OSTI)

Large loading events on wind turbine rotor blades are often associated with transient bursts of coherent turbulent energy in the turbine inflow. These coherent turbulent structures are identified as peaks in the three-dimensional, instantaneous, turbulent shearing stress field. Such organized inflow structures and the accompanying rotor aeroelastic responses typically have time scales of only a few seconds and therefore do not lend themselves for analysis by conventional Fourier spectral techniques. Time-frequency analysis (and wavelet analysis in particular) offers the ability to more closely study the spectral decomposition of short period events such as the interaction of coherent turbulence with a moving rotor blade. In this paper, the authors discuss the initial progress in the application of time-frequency analysis techniques to the decomposition and interpretation of turbulence/rotor interaction. The authors discuss the results of applying both the continuous and discrete wavelet transforms for their application. Several examples are given of the techniques applied to both observed turbulence and turbine responses and those generated using numerical simulations. They found that the presence of coherent turbulent structures, as revealed by the inflow Reynolds stress field, is a major contributor to large load excursions. These bursts of coherent turbulent energy induce a broadband aeroelastic response in the turbine rotor as it passes through them.

Kelley, N.D.; Osgood, R.M.; Bialasiewicz, J.T.; Jakubowski, A.

2000-01-05T23:59:59.000Z

237

Dynamic Rotor Deformation and Vibration Monitoring Using a Non-Incremental Laser Doppler Distance Sensor  

Science Conference Proceedings (OSTI)

Monitoring rotor deformations and vibrations dynamically is an important task for improving the safety and the lifetime as well as the energy efficiency of motors and turbo machines. However, due to the high rotor speed encountered in particular at turbo machines, this requires concurrently a high measurement rate and high accuracy, which can not be fulfilled by most commercially available sensors. To solve this problem, we developed a non-incremental laser Doppler distance sensor (LDDS), which is able to measure simultaneously the in-plane velocity and the out-of-plane position of moving rough solid objects with micrometer precision. In addition, this sensor concurrently offers a high temporal resolution in the microsecond range, because its position uncertainty is in principle independent of the object velocity in contrast to conventional distance sensors, which is a unique feature of the LDDS. Consequently, this novel sensor enables precise and dynamic in-process deformation and vibration measurements on rotating objects, such as turbo machine rotors, even at very high speed. In order to evidence the capability of the LDDS, measurements of rotor deformations (radial expansion), vibrations and wobbling motions are presented at up to 50,000 rpm rotor speed.

Pfister, Thorsten; Guenther, Philipp; Dreier, Florian; Czarske, Juergen [Technische Universitaet Dresden, Faculty of Electrical Engineering and Information Technology, Laboratory for Measurement and Testing Techniques, Helmholtzstrasse 18, D-01062 Dresden (Germany)

2010-05-28T23:59:59.000Z

238

Transient analysis of a flywheel battery containment during a full rotor burst event.  

DOE Green Energy (OSTI)

Flywheels are being developed for use in an Advanced Locomotive Propulsion System (ALPS) targeted for use in high speed passenger rail service. The ALPS combines high performance, high speed gas turbines, motor/generators and flywheels to provide a light-weight, fuel-efficient power system. Such a system is necessary to avoid the high cost of railway electrification, as is currently done for high speed rail service (>100mph) since diesels are too heavy. The light-weight flywheel rotors are made from multilayered composite materials, and are operated at extremely high energy levels. Metal containment structures have been designed to enclose the rotors and provide encapsulation of the rotor during postulated failure events. One such event is a burst mode failure of the rotor in which the composite rim is assumed to burst into debris that impacts against the containment. This paper presents a finite element simulation of the transient structural response of a subscale metal flywheel containment structure to a rotor burst event.

Hsieh, B. J.

1998-04-17T23:59:59.000Z

239

WindPACT Turbine Rotor Design Study: June 2000--June 2002 (Revised)  

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

WindPACT Turbine Rotor WindPACT Turbine Rotor Design Study June 2000 - June 2002 D.J. Malcolm Global Energy Concepts, LLC Kirkland, Washington A.C. Hansen Windward Engineering Salt Lake City, Utah Subcontract Report NREL/SR-500-32495 Revised April 2006 WindPACT Turbine Rotor Design Study June 2000 - June 2002 D.J. Malcolm Global Energy Concepts, LLC Kirkland, Washington A.C. Hansen Windward Engineering Salt Lake City, Utah NREL Technical Monitor: A. Laxson Prepared under Subcontract No. YAT-0-30213-01 Subcontract Report NREL/SR-500-32495 Revised April 2006 National Renewable Energy Laboratory 1617 Cole Boulevard, Golden, Colorado 80401-3393 303-275-3000 * www.nrel.gov Operated for the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy by Midwest Research Institute * Battelle

240

Nebulous Art of Using Wind-Tunnel Airfoil Data for Predicting Rotor Performance: Preprint  

DOE Green Energy (OSTI)

The objective of this study was threefold: to evaluate different two-dimensional S809 airfoil data sets in the prediction of rotor performance; to compare blade-element momentum rotor predicted results to lifting-surface, prescribed-wake results; and to compare the NASA Ames combined experiment rotor measured data with the two different performance prediction methods. The S809 airfoil data sets evaluated included those from Delft University of Technology, Ohio State University, and Colorado State University. The performance prediction comparison with NASA Ames data documents shortcomings of these performance prediction methods and recommends the use of the lifting-surface, prescribed-wake method over blade-element momentum theory for future analytical improvements.

Tangler, J. L.

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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.


241

Axial seal system for a gas turbine steam-cooled rotor  

DOE Patents (OSTI)

An axial seal assembly is provided at the interface between adjacent wheels and spacers of a gas turbine rotor and disposed about tubes passing through openings in the rotor adjacent the rotor rim and carrying a thermal medium. Each seal assembly includes a support bushing for supporting a land of the thermal medium carrying tube, an axially registering seat bushing disposed in the opposed opening and a frustoconical seal between the seal bushing and seat. The seal bushing includes a radial flange having an annular recess for retaining the outer diameter edge of the seal, while the seat bushing has an axially facing annular surface forming a seat for engagement by the inner diameter edge of the seal.

Mashey, Thomas Charles (Anderson, SC)

2002-01-01T23:59:59.000Z

242

Adaptive control using neural network for command following of tilt-rotor airplane in 0°-tilt angle mode  

Science Conference Proceedings (OSTI)

This paper deals with an autonomous flight algorithm design problem for the tilt-rotor airplane under development by Korea Aerospace Research Institute for simulation study. The objective of this paper is to design a guidance and control algorithm to ... Keywords: KARI tilt-rotor airplane, adaptive control, approximate modelbased inversion, command following, neural network

Jae Hyoung Im; Cheolkeun Ha

2009-09-01T23:59:59.000Z

243

An Evaluation of Free- and Fixed-Vane Flowmeters with Curved- and Flat-Bladed Savonius Rotors  

Science Conference Proceedings (OSTI)

Speed and direction performances of flowmeters, designed by the authors for in-house use, employing an Aanderaa-type curved-bladed Savonius rotor and a free vane and an Aanderaa-type flat-bladed Savonius rotor and a fixed vane, are discussed. It ...

Antony Joseph; Ehrlich Desa

1994-04-01T23:59:59.000Z

244

Gamma-soft Analog of the Confined Beta-soft Rotor Model  

E-Print Network (OSTI)

A gamma-soft analog of the confined beta-soft (CBS) rotor model is developed, by using a gamma-independent displaced infinite well beta-potential in the Bohr Hamiltonian, for which exact separation of variables is possible. Level schemes interpolating between the E(5) critical point symmetry (with R(4/2)=E(4)/E(2)= 2.20) and the O(5) gamma-soft rotor (with R(4/2)=2.50) are obtained, exhibiting a crossover of excited 0+ bandheads which leads to agreement with the general trends of first excited 0+ states in this region and is observed experimentally in 128-Xe and 130-Xe.

D. Bonatsos; D. Lenis; N. Pietralla; P. A. Terziev

2006-09-19T23:59:59.000Z

245

Motion control for a vertical rigid rotor rotating in electromagnetic bearings  

Science Conference Proceedings (OSTI)

The problems of control of a motion of a rigid rotor in electromagnetic bearings are considered. The main ides of synthesis of the control laws is the approach based on feedback linearization of the original nonlinear mathematical model of the system. ...

D. V. Balandin; M. M. Kogan

2011-10-01T23:59:59.000Z

246

Situational awareness based flight control of a four-rotor type UAV  

Science Conference Proceedings (OSTI)

This paper focuses on a critical component of the situational awareness (SA), the control of autonomous vertical flight for an unmanned aerial vehicle (UAV). With the SA strategy, we proposed a two stage flight control procedure using two autonomous ... Keywords: flight control, four-rotor helicopter, simulation, situational awareness, unmanned aerial vehicle

Igor Astrov; Andrus Pedai

2011-05-01T23:59:59.000Z

247

Soft triaxial rotor in the vicinity of $?=?/6$ and its extensions  

E-Print Network (OSTI)

The collective Bohr hamiltonian is solved for the soft triaxial rotor around $\\gamma_0=\\pi/6$ with a displaced harmonic oscillator potential in $\\gamma$ and a Kratzer-like potential in $\\beta$. The properties of the spectrum are outlined and a generalization for the more general triaxial case with $0<\\gamma<\\pi/6$ is proposed.

L. Fortunato; S. De Baerdemacker; K. Heyde

2004-10-26T23:59:59.000Z

248

Gibbsianness versus Non-Gibbsianness of time-evolved planar rotor models  

E-Print Network (OSTI)

We study the Gibbsian character of time-evolved planar rotor systems on Z^d, d at least 2, in the transient regime, evolving with stochastic dynamics and starting with an initial Gibbs measure. We model the system by interacting Brownian diffusions, moving on circles. We prove that for small times and arbitrary initial Gibbs measures \

A. C. D. van Enter; W. M. Ruszel

2007-11-22T23:59:59.000Z

249

Atom optics kicked rotor: experimental evidence for a pendulum description of the quantum resonance  

E-Print Network (OSTI)

We present measurements of the mean energy for an atom optics kicked rotor ensemble close to quantum resonance. Oscillations in the mean energy in this regime are are shown to be in agreement with a quasi--classical pendulum approximation. The period of the oscillations is shown to scale with a single variable, which depends on the number of kicks.

S. Wayper; M. Sadgrove; W. Simpson; M. D. Hoogerland

2005-04-29T23:59:59.000Z

250

Prediction and Analysis of Rotor Tip-Clearance Flows using Large-Eddy Simulation  

Science Conference Proceedings (OSTI)

In order to analyze the dynamics of rotor tip-clearance flow and determine the underlying mechanism for the tip-leakage cavitation, a newly developed large-eddy simulation (LES) solver which combines an immersed-boundary method with a generalized curvilinearstructured ...

Donghyun You; Meng Wang; Parviz Moin; Rajat Mittal

2004-06-01T23:59:59.000Z

251

Horizontal-axis wind-system rotor performance model comparison: a compendium  

SciTech Connect

This compendium consists of four reports, the purpose of which is to evaluate performance prediction methods for horizontal-axis wind turbines. The reports were prepared by four separate contractors. Oregon State University, AeroVironment, Inc., Aerospace Systems, Inc., and United Technologies Research Center (UTRC). Three of the four contractors used a blade-element/momentum analysis, while the fourth (UTRC) utilized a lifting line/prescribed wake analysis. These contractors were to apply their prediction methods to two rotors, that of the Enertech 1500 and that of the 1/3-scale UTRC 8 kW turbines. Results from the four prediction methods are compared with actual test data gathered via Controlled Velocity Testing (CVT), carried out by the Rocky Flats Wind Energy Research Center, operated by Rockwell International for the US Department of Energy. The conclusions of the four reports are reviewed in an introduction prepared by Rockwell International. For the Enertech 1500, rotor performance predictions closely agreed with CVT data. Yet, because of the lack of high tip speed ratio data, verification of the Glauert momentum theory was not possible. Predictions regarding the UTRC 1/3 scale 8 kW rotor did not agree well with test results. The reasons cited for the discrepancies center on inadequate airfoil section data and the varying blade pitch angles of the unique UTRC flexbeam rotor.

Not Available

1983-02-01T23:59:59.000Z

252

Dynamic Analysis and Control of an Energy Storage Flywheel Rotor with Active Magnetic Bearings  

Science Conference Proceedings (OSTI)

Flywheel energy storage is a promising technology for providing intermediate energy storage. An energy storage flywheel is supported by active magnetic bearings (AMBs) to achieve high speed running and increase energy efficiency of the energy storage ... Keywords: Flywheel, Energy Storage, Magnetic Bearing, Rotor Dynamics

Zhang Kai; Dai Xingjian; Zhang Xiaozhang

2010-12-01T23:59:59.000Z

253

MPC for Wind Power Gradients --Utilizing Forecasts, Rotor Inertia, and Central Energy Storage  

E-Print Network (OSTI)

MPC for Wind Power Gradients -- Utilizing Forecasts, Rotor Inertia, and Central Energy Storage iterations. We demonstrate our method in simulations with various wind scenarios and prices for energy. INTRODUCTION Today, wind power is the most important renewable energy source. For the years to come, many

254

Real-time rotor bar current measurements using bluetooth technology for a brushless doubly-fed machine (BDFM  

E-Print Network (OSTI)

The Brushless Doubly Fed Machine (BDFM) shows economic promise as a variable speed drive or generator. The optimization of the machine and model-based control strategies both rely on machine models, and the experimental verification of these models. To date, dynamic measurements of rotor quantities have not been possible. The authors present a system of measuring rotor bar currents in real time using a Rogowski coil to detect the current and recently developed Bluetooth wireless technology to transmit the data from the moving rotor to a computer. Experimental data collected from the system are included. 1.

P. C. Roberts; E. Abdi Jalebi; R. A. Mcmahon; T. J. Flack

2004-01-01T23:59:59.000Z

255

A TIME ACCURATE PREDICTION OF THE VISCOUS FLOW IN A TURBINE STAGE INCLUDING A ROTOR IN MOTION.  

E-Print Network (OSTI)

??AbstractA TIME ACCURATE PREDICTION OF THE VISCOUS FLOW IN A TURBINE STAGE INCLUDING A ROTOR IN MOTIONBy Akamol ShavalikulThe actual flow field in a turbine… (more)

Shavalikul, Akamol

2009-01-01T23:59:59.000Z

256

SAFER-PC Version 2.2, Stress and Fracture Evaluation of Rotors - Personal Computer, Version 2.2  

Science Conference Proceedings (OSTI)

The Stress and Fracture Evaluation of RotorsPersonal Computer (SAFER-PC), Version 2.2 software will evaluate the remaining life of steam turbine and generator rotors. Version 2.2 is an upgrade of existing analysis software. SAFER-PC combines transient thermal-elastic finite element stress analysis, fracture mechanics, material property data, and the clustering and linking of surface defects identified from nondestructive examination (NDE) data to assess remaining usable life of steam turbine or generator...

2006-12-22T23:59:59.000Z

257

Metallurgical Guidebook for Steam Turbine Rotors and Discs, Volume 1: Chemistry, Manufacturing, Service Degradation, Life Assessment , and Repair  

Science Conference Proceedings (OSTI)

This guide is a compilation of information concerning steam turbine rotors and discs. Due to the variety of operating temperatures and conditions involved, factors such as material composition, manufacturing and heat treatment condition methods, and property requirements may differ from one steam turbine to another. Specifically, this guide addresses turbine rotor and disc materials used, vintages, manufacturing history, quality conditions, and chemical and mechanical properties, and it provides utility ...

2009-12-23T23:59:59.000Z

258

Demonstration of perfect coherence preservation for matter-waves perturbed by a delta-kicked rotor  

E-Print Network (OSTI)

We demonstrate perfect coherence preservation in an atom interferometer perturbed by optical standing wave pulses acting as a kicked rotor. In our experiment we subject a cloud of cold rubidium atoms in a magnetic guide to periodic kicks from a sinusoidal potential created by standing wave pulses of off-resonant laser light propagating along the guiding direction. While, in general, we observed a strong decoherence of matter-waves due to applied perturbations the coherence is perfectly preserved for the conditions similar but not limited to quantum resonances of the quantum kicked rotor. Moreover, these conditions do not depend on the number of kicks applied or require any regularity in the pulse strengths. We show that the narrowing of the width of coherence revival as a function of increasing kick number provides a new method for precise measurement of recoil frequency.

Tonyushkin, A; Prentiss, M

2008-01-01T23:59:59.000Z

259

Delocalized and Resonant Quantum Transport in Nonlinear Generalizations of the Kicked Rotor Model  

E-Print Network (OSTI)

We analyze the effects of a nonlinear cubic perturbation on the delta-Kicked Rotor. We consider two different models, in which the nonlinear term acts either in the position or in the momentum representation. We numerically investigate the modifications induced by the nonlinearity in the quantum transport in both localized and resonant regimes and a comparison between the results for the two models is presented. Analyzing the momentum distributions and the increase of the mean square momentum, we find that the quantum resonances asymptotically are very stable with respect to the nonlinear perturbation of the rotor's phase evolution. For an intermittent time regime, the nonlinearity even enhances the resonant quantum transport, leading to superballistic motion.

Laura Rebuzzini; Sandro Wimberger; Roberto Artuso

2004-10-12T23:59:59.000Z

260

Frequency Dependence of Rotor's Free Falling Acceleration and Inequality of Inertial and Gravity Masses  

E-Print Network (OSTI)

Results of measurements of free falling acceleration of a closed container with a rotor of a mechanical gyroscope placed inside it on the frequency of the rotor rotation are briefly described. Time of separate accelerations measurements is 40 ms, the period of sampling is from 0.5 up to 1.0 minute. In rotation's frequencies range of 20-400 Hz, the negative changes of free falling container acceleration prevail. On individual frequencies the "resonant" maxima and minima of acceleration are observed. The obtained data apparently contradict the equivalence principle of inertial and gravitating masses. The expediency of development of ballistic gravimetry of high time resolution with use of rotating or oscillating test bodies is noted.

Dmitriev, Alexander L

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Frequency Dependence of Rotor's Free Falling Acceleration and Inequality of Inertial and Gravity Masses  

E-Print Network (OSTI)

Results of measurements of free falling acceleration of a closed container with a rotor of a mechanical gyroscope placed inside it on the frequency of the rotor rotation are briefly described. Time of separate accelerations measurements is 40 ms, the period of sampling is from 0.5 up to 1.0 minute. In rotation's frequencies range of 20-400 Hz, the negative changes of free falling container acceleration prevail. On individual frequencies the "resonant" maxima and minima of acceleration are observed. The obtained data apparently contradict the equivalence principle of inertial and gravitating masses. The expediency of development of ballistic gravimetry of high time resolution with use of rotating or oscillating test bodies is noted.

Alexander L. Dmitriev

2011-01-24T23:59:59.000Z

262

Identification of rotordynamic forces in a flexible rotor system using magnetic bearings  

E-Print Network (OSTI)

Methods are presented for parameter identification of an annular gas seal on a flexiblerotor test rig. Dynamic loads are applied by magnetic bearings (MBs) that support the rotor. MB forces are measured using fiber-optic strain gauges that are bonded to the poles of the MBs. In addition to force and position measurements, a finite element (FE) rotor model is required for the identification algorithms. The FE rotor model matches free-free characteristics of the test rotor. The addition of smooth air seals to the system introduces stiffness and damping terms for identification that are representative of reaction forces in turbomachines. Tests are performed to experimentally determine seal stiffness and damping coefficients for different running speeds and preswirl conditions. Stiffness and damping coefficients are determined using a frequency domain identification method. This method uses an iterative approach to minimize error between theoretical and experimental transfer functions. Several time domain approaches are also considered; however, these approaches do not produce valid identification results. Stiffness coefficients are measured using static test results and an MB current and position based model. Test results produce seal coefficients with low uncertainties for the frequency domain identification method. Static test uncertainties are an order of magnitude larger, and time domain attempts fail to produce sealIn addition to the primary identification research, an investigation of the relationships between MB force, strain, and magnetic field is conducted. The magnetic field of an MB is modeled using commercial FE software. The magnetic field model is used to predict strain measurements for quasi-static test conditions. The strain predictions are compared with experimental strain measurements. Strain predictions agree with experimental measurements, although strain is typically over-predicted. coefficient measurements.

Zutavern, Zachary Scott

2006-08-01T23:59:59.000Z

263

The Rotor Model with spectral parameters and enumerations of Alternating Sign Matrices  

E-Print Network (OSTI)

In this paper we study the Rotor Model of Martins and Nienhuis. After introducing spectral parameters, a combined use of integrability, polynomiality of the ground state wave function and a mapping into the fully-packed O(1)-model allows us to determine the sum rule and a family of maximally nested components for different boundary conditions. We see in this way the appearance of 3-enumerations of Alternating Sign Matrices.

Luigi Cantini

2007-03-29T23:59:59.000Z

264

The initial momentum dependence of the quantum resonance in the delta-kicked rotor  

E-Print Network (OSTI)

The influence of an initial momentum on the appearance of "quantum resonances" in the delta-kicked rotor system is explored experimentally. We show that for certain initial momenta, a resonance can be negated entirely, whereas at others a resonance can be made to appear. At a larger number of kicks, all resonances are shown to narrow. We show that as a consequence, the individual "diffraction peaks" may split. We compare our results to numerical simulations as well as analytical theory.

J-A. Currivan; A. Ullah; M. D. Hoogerland

2008-06-18T23:59:59.000Z

265

Short-time quantum correlations in the atom optics kicked rotor  

E-Print Network (OSTI)

We experimentally verify the analytical expressions that exist for the diffusion rate in the quantum delta kicked rotor system for small numbers of kicks. We show development of diffusion resonances from two to five kicks, and of multiple resonances for high kick strengths. Furthermore, we show that, in contrast to classical predictions, the results are purely periodic in the kick period, and reproduce the predicted quantum- and diffusion resonances.

S. A. Wayper; W. Simpson; M. D. Hoogerland

2006-02-08T23:59:59.000Z

266

Labyrinth for an ignition distributor cap and rotor assembly with atmospheric purging action  

SciTech Connect

This patent describes an ignition distributor to work with spark plug electrodes, a rotor electrode, a coil electrode and a shaft for an internal combustion engine with cylinders, the ignition distributor comprising: a bowl shaped housing; a distributor cap comprising: a generally dome shape with a generally hollow interior and with a circular shaped bottom to mate with the bowl shaped housing; spark towers equal in number to the number of cylinders of the internal combustion engine, projecting up from the top of the dome shape and slotted to accept spark plug electrodes and allow them to protrude into the distributor cap interior for communication with the rotor electrode; a vent tower projecting up from the top of the dome shape and provided with a vent port through to the distributor cap interior to allow for the outward flow of the atmosphere inside the distributor cap and bowl shaped housing; a coil tower projecting up from the top of the dome shape and slotted to accept a coil electrode and allow it to protrude into the distributor cap interior for communication with the rotor electrode; an inner labyrinth of annular shape on the interior surface of the dome shape surround the coil electrode and protruding into the hollow interior of the dome shape; and an outer labyrinth of annular shape on the interior surface of the dome shape surrounding the inner labyrinth thereby forming an annular channel.

Kronberger, L.J.

1986-12-23T23:59:59.000Z

267

Can quantum fractal fluctuations be observed in an atom-optics kicked rotor experiment?  

E-Print Network (OSTI)

We investigate the parametric fluctuations in the quantum survival probability of an open version of the delta-kicked rotor model in the deep quantum regime. Spectral arguments [Guarneri I and Terraneo M 2001 Phys. Rev. E vol. 65 015203(R)] predict the existence of parametric fractal fluctuations owing to the strong dynamical localisation of the eigenstates of the kicked rotor. We discuss the possibility of observing such dynamically-induced fractality in the quantum survival probability as a function of the kicking period for the atom-optics realisation of the kicked rotor. The influence of the atoms' initial momentum distribution is studied as well as the dependence of the expected fractal dimension on finite-size effects of the experiment, such as finite detection windows and short measurement times. Our results show that clear signatures of fractality could be observed in experiments with cold atoms subjected to periodically flashed optical lattices, which offer an excellent control on interaction times and the initial atomic ensemble.

Andrea Tomadin; Riccardo Mannella; Sandro Wimberger

2005-12-01T23:59:59.000Z

268

Rotor Design for High Pressure Magic Angle Spinning Nuclear Magnetic Resonance  

Science Conference Proceedings (OSTI)

High pressure magic angle spinning (MAS) nuclear magnetic resonance (NMR) with a sample spinning rate exceeding 2.1 kHz and pressure greater than 165 bar has never been realized. In this work, a new sample cell design is reported, suitable for constructing cells of different sizes. Using a 7.5 mm high pressure MAS rotor as an example, internal pressure as high as 200 bar at a sample spinning rate of 6 kHz is achieved. The new high pressure MAS rotor is re-usable and compatible with most commercial NMR set-ups, exhibiting low 1H and 13C NMR background and offering maximal NMR sensitivity. As an example of its many possible applications, this new capability is applied to determine reaction products associated with the carbonation reaction of a natural mineral, antigorite ((Mg,Fe2+)3Si2O5(OH)4), in contact with liquid water in water-saturated supercritical CO2 (scCO2) at 150 bar and 50 ?C. This mineral is relevant to the deep geologic disposal of CO2, but its iron content results in too many sample spinning sidebands at low spinning rate. Hence, this chemical system is a good case study to demonstrate the utility of the higher sample spinning rates that can be achieved by our new rotor design. We expect this new capability will be useful for exploring solid-state, including interfacial, chemistry at new levels of high-pressure in a wide variety of fields.

Turcu, Romulus VF; Hoyt, David W.; Rosso, Kevin M.; Sears, Jesse A.; Loring, John S.; Felmy, Andrew R.; Hu, Jian Z.

2013-01-01T23:59:59.000Z

269

Characterizing Inflow Conditions Across the Rotor Disk of a Utility-Scale Wind Turbine (Poster)  

DOE Green Energy (OSTI)

Multi-megawatt utility-scale wind turbines operate in a turbulent, thermally-driven atmosphere where wind speed and air temperature vary with height. Turbines convert the wind's momentum into electrical power, and so changes in the atmosphere across the rotor disk influence the power produced by the turbine. To characterize the inflow into utility scale turbines at the National Wind Technology Center (NWTC) near Boulder, Colorado, NREL recently built two 135-meter inflow monitoring towers. This poster introduces the towers and the measurements that are made, showing some of the data obtained in the first few months of operation in 2011.

Clifton, A.; Lundquist, J. K.; Kelley, N.; Scott, G.; Jager, D.; Schreck, S.

2012-01-01T23:59:59.000Z

270

Suppression of decoherence-induced diffusion in the quantum kicked rotor  

Science Conference Proceedings (OSTI)

We describe a method that allows transient suppression of spontaneous emission-induced diffusion in the atom-optics realization of the kicked rotor. The system is prepared in an initial state with a momentum distribution concentrated in an interval much sharper than the Brillouin zone; the measure of the momentum distribution is restricted to this interval of quasimomenta. Because most of the atoms undergoing decoherence processes fall outside this detection range and thus are not detected, the measured signal is effectively free of decoherence-induced diffusion effects.

Lepers, Maxence; Zehnle, Veronique; Garreau, Jean Claude [Laboratoire de Physique des Lasers, Atomes et Molecules, Universite Lille 1 Sciences et Technologies, CNRS, F-59655 Villeneuve d'Ascq Cedex (France)

2010-06-15T23:59:59.000Z

271

Blade-forced vibration effects in turbomachinery rotor-stator interaction  

E-Print Network (OSTI)

This thesis presents the effects of blade-forced vibration in turbomachinery rotor-stator interaction. A quasi-three-dimensional multi-row analysis, based on an Euler/Navier-Stokes solver and a parallel computational algorithm, was used to simulate the unsteady flow in a turbine. Results are presented for non-dimensional pressure, velocity, and entropy in the blade passage. The two-stage turbine flow analysis was completed for the case with blade-forced response as well as the case without blade-forced response for comparison.

Collard, Joseph Eugene

2000-01-01T23:59:59.000Z

272

Bushing retention system for thermal medium cooling delivery tubes in a gas turbine rotor  

SciTech Connect

Bushings are provided in counterbores for wheels and spacers for supporting thermal medium cooling tubes extending axially adjacent the rim of the gas turbine rotor. The retention system includes a retaining ring disposed in a groove adjacent an end face of the bushing and which retaining ring projects radially inwardly to prevent axial movement of the bushing in one direction. The retention ring has a plurality of circumferentially spaced tabs along its inner diameter whereby the ring is supported by the lands of the tube maintaining its bushing retention function, notwithstanding operation in high centrifugal fields and rotation of the ring in the groove into other circular orientations.

Mashey, Thomas Charles (Coxsackie, NY)

2002-01-01T23:59:59.000Z

273

The role of quasi-momentum in the resonant dynamics of the atom-optics kicked rotor  

E-Print Network (OSTI)

We examine the effect of the initial atomic momentum distribution on the dynamics of the atom-optical realisation of the quantum kicked rotor. The atoms are kicked by a pulsed optical lattice, the periodicity of which implies that quasi-momentum is conserved in the transport problem. We study and compare experimentally and theoretically two resonant limits of the kicked rotor: in the vicinity of the quantum resonances and in the semiclassical limit of vanishing kicking period. It is found that for the same experimental distribution of quasi-momenta, significant deviations from the kicked rotor model are induced close to quantum resonance, while close to the classical resonance (i.e. for small kicking period) the effect of the quasi-momentum vanishes.

Sandro Wimberger; Mark Sadgrove

2005-05-20T23:59:59.000Z

274

Wind Energy Meteorology: Insight into Wind Properties in the Turbine-Rotor Layer of the Atmosphere from High-Resolution Doppler Lidar  

Science Conference Proceedings (OSTI)

Addressing the need for high-quality wind information aloft in the layer occupied by turbine rotors (~30–150 m above ground level) is one of many significant challenges facing the wind energy industry. Without wind measurements at heights within the rotor ...

Robert M. Banta; Yelena L. Pichugina; Neil D. Kelley; R. Michael Hardesty; W. Alan Brewer

2013-06-01T23:59:59.000Z

275

Application of gradient-based optimization methods for a rotor system with static stress, natural frequency,and harmonic response constraints  

Science Conference Proceedings (OSTI)

This paper demonstrates the application of gradient-based optimization methods to the minimal weight design optimization of rotor systems. A nonlinear constrained optimization problem is considered. Design variables are inner radii and wall thicknesses ... Keywords: Gradient projection method, Rotordynamics, Sequential quadratic programming, Sizing optimization, Turbine rotor

Alexander O. Pugachev

2013-06-01T23:59:59.000Z

276

New analytic solutions of the collective Bohr hamiltonian for a beta-soft, gamma-soft axial rotor  

E-Print Network (OSTI)

New analytic solutions of the quadrupole collective Bohr hamiltonian are proposed, exploiting an approximate separation of the beta and gamma variables to describe gamma-soft prolate axial rotors. The model potential is a sum of two terms: a beta-dependent term taken either with a Coulomb-like or a Kratzer-like form, and a gamma-dependent term taken as an harmonic oscillator. In particular it is possible to give a one parameter paradigm for a beta-soft, gamma-soft axial rotor that can be applied, with a considerable agreement, to the spectrum of 234U.

Lorenzo Fortunato; Andrea Vitturi

2003-12-18T23:59:59.000Z

277

Exponential Quantum Spreading in a Class of Kicked Rotor Systems near High-Order Resonances  

E-Print Network (OSTI)

Long-lasting quantum exponential spreading was recently found in a simple but very rich dynamical model, namely, an on-resonance double-kicked rotor model [J. Wang, I. Guarneri, G. Casati, and J. B. Gong, Phys. Rev. Lett. 107, 234104 (2011)]. The underlying mechanism, unrelated to the chaotic motion in the classical limit but resting on quasi-integrable motion in a pseudoclassical limit, is identified for one special case. By presenting a detailed study of the same model, this work offers a framework to explain long-lasting quantum exponential spreading under much more general conditions. In particular, we adopt the so-called "spinor" representation to treat the kicked-rotor dynamics under high-order resonance conditions and then exploit the Born-Oppenheimer approximation to understand the dynamical evolution. It is found that the existence of a flat-band (or an effectively flat-band) is one important feature behind why and how the exponential dynamics emerges. It is also found that a quantitative prediction of the exponential spreading rate based on an interesting and simple pseudoclassical map may be inaccurate. In addition to general interests regarding the question of how exponential behavior in quantum systems may persist for a long time scale, our results should motivate further studies towards a better understanding of high-order resonance behavior in delta-kicked quantum systems.

Hailong Wang; Jiao Wang; Italo Guarneri; Giulio Casati; Jiangbin Gong

2013-08-16T23:59:59.000Z

278

Mass Transfer Testing of a 12.5-cm Rotor Centrifugal Contactor  

Science Conference Proceedings (OSTI)

TRUEX mass transfer tests were performed using a single stage commercially available 12.5 cm centrifugal contactor and stable cerium (Ce) and europium (Eu). Test conditions included throughputs ranging from 2.5 to 15 Lpm and rotor speeds of 1750 and 2250 rpm. Ce and Eu extraction forward distribution coefficients ranged from 13 to 19. The first and second stage strip back distributions were 0.5 to 1.4 and .002 to .004, respectively, throughout the dynamic test conditions studied. Visual carryover of aqueous entrainment in all organic phase samples was estimated at < 0.1 % and organic carryover into all aqueous phase samples was about ten times less. Mass transfer efficiencies of = 98 % for both Ce and Eu in the extraction section were obtained over the entire range of test conditions. The first strip stage mass transfer efficiencies ranged from 75 to 93% trending higher with increasing throughput. Second stage mass transfer was greater than 99% in all cases. Increasing the rotor speed from 1750 to 2250 rpm had no significant effect on efficiency for all throughputs tested.

D. H. Meikrantz; T. G. Garn; J. D. Law; N. R. Mann; T. A. Todd

2008-09-01T23:59:59.000Z

279

User`s Guide for the NREL Teetering Rotor Analysis Program (STRAP)  

DOE Green Energy (OSTI)

The following report gives the reader an overview of instructions on the proper use of the National Renewable Energy Laboratory (formerly the Solar Energy Research Institute, or SERI) teetering Rotor Analysis Program (STRAP version 2.20). STRAP is a derivative of the Force and Loads Analysis program (FLAP). It is intended as a tool for prediction of rotor and blade loads and response for only two-bladed teetering hub wind turbines. The effects of delta-3, undersling, hub mass, and wind turbulence are accounted for. The objectives of the report are to give an overview of the code and also show the methods of data input and correct code execution steps in order to model an example two-bladed teetering hub turbine. A large portion of the discussion (Sections 6.0, 7.0, and 8.0) is devoted to the subject of inputting and running the code for wind turbulence effects. The ability to include turbulent wind effects is perhaps the biggest change in the code since the release of FLAP version 2.01 in 1988. This report is intended to be a user`s guide. It does not contain a theoretical discussion on equations of motion, assumptions, underlying theory, etc. It is intended to be used in conjunction with Wright, Buhl, and Thresher (1988).

Wright, A.D.

1992-08-01T23:59:59.000Z

280

User's Guide for the NREL Teetering Rotor Analysis Program (STRAP). [National Renewable Energy Laboratory (NREL)  

DOE Green Energy (OSTI)

The following report gives the reader an overview of instructions on the proper use of the National Renewable Energy Laboratory (formerly the Solar Energy Research Institute, or SERI) teetering Rotor Analysis Program (STRAP version 2.20). STRAP is a derivative of the Force and Loads Analysis program (FLAP). It is intended as a tool for prediction of rotor and blade loads and response for only two-bladed teetering hub wind turbines. The effects of delta-3, undersling, hub mass, and wind turbulence are accounted for. The objectives of the report are to give an overview of the code and also show the methods of data input and correct code execution steps in order to model an example two-bladed teetering hub turbine. A large portion of the discussion (Sections 6.0, 7.0, and 8.0) is devoted to the subject of inputting and running the code for wind turbulence effects. The ability to include turbulent wind effects is perhaps the biggest change in the code since the release of FLAP version 2.01 in 1988. This report is intended to be a user's guide. It does not contain a theoretical discussion on equations of motion, assumptions, underlying theory, etc. It is intended to be used in conjunction with Wright, Buhl, and Thresher (1988).

Wright, A.D.

1992-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Measured and predicted rotor performance for the SERI advanced wind turbine blades  

DOE Green Energy (OSTI)

Measured and predicted rotor performance for the SERI advanced wind turbine blades were compared to assess the accuracy of predictions and to identify the sources of error affecting both predictions and measurements. An awareness of these sources of error contributes to improved prediction and measurement methods that will ultimately benefit future rotor design efforts. Propeller/vane anemometers were found to underestimate the wind speed in turbulent environments such as the San Gorgonio Pass wind farm area. Using sonic or cup anemometers, good agreement was achieved between predicted and measured power output for wind speeds up to 8 m/sec. At higher wind speeds an optimistic predicted power output and the occurrence of peak power at wind speeds lower than measurements resulted from the omission of turbulence and yaw error. In addition, accurate two-dimensional (2-D) airfoil data prior to stall and a post stall airfoil data synthesization method that reflects three-dimensional (3-D) effects were found to be essential for accurate performance prediction. 11 refs.

Tangler, J.; Smith, B.; Kelley, N.; Jager, D.

1992-02-01T23:59:59.000Z

282

WindPACT Rotor Design Study: Hybrid Tower Design; Period of Performance: 29 June 2000 -- 28 February 2004  

DOE Green Energy (OSTI)

The cost of a wind turbine tower can represent as much as 20% of the cost of an entire megawatt-scale horizontal axis wind turbine (HAWT) and as much as 10% of the total cost of energy. The tower is a major cost component, and its design is important: Its structural properties are key to the response of the rotor; its height determines the wind regime that the rotor experiences; it allows access to the turbine nacelle and rotor; and it houses components of the electrical connection and the control and protection systems. Most large wind turbines installed in the United States use self-supporting steel tubular towers. The diameter of these tubes is limited by the size that can be transported by road (approximately 4.3 m). The base dimensions of a truss tower are not restrained by this limit, but trusses may require more maintenance. Guyed tube towers have been used, but they represent additional foundation costs and inconvenience. Addressing these limitations may lead to an alternative that avoids the problems. For this reason, the WindPACT Rotor Design Study was modified to include a study of a hybrid tower to determine the technical and economic feasibility of such a design.

Malcolm, D. J.

2004-04-01T23:59:59.000Z

283

Estimation of rotor angles of synchronous machines using artificial neural networks and local PMU-based quantities  

Science Conference Proceedings (OSTI)

This paper investigates a possibility for estimating rotor angles in the time frame of transient (angle) stability of electric power systems, for use in real-time. The proposed dynamic state estimation technique is based on the use of voltage and current ... Keywords: Electric power systems, Multilayer perceptrons, Phasor measurement units, Transient stability monitoring and control

Alberto Del Angel; Pierre Geurts; Damien Ernst; Mevludin Glavic; Louis Wehenkel

2007-10-01T23:59:59.000Z

284

Steady and Periodic Pressure Measurements on a Generic Helicopter Fuselage Model in the Presence of a Rotor  

Science Conference Proceedings (OSTI)

A wind tunnel test of a generic helicopter fuselage model with an independently mounted rotor has been conducted to obtain steady and periodic pressure data on the helicopter body. The model was tested at four advance ratios and three thrust coefficients. ...

Mineck Raymond E.; Gorton Susan Althoff

2000-06-01T23:59:59.000Z

285

Cost optimization of a hybrid composite flywheel rotor with a split-type hub using combined analytical/numerical models  

Science Conference Proceedings (OSTI)

A procedure to find the optimal design of a flywheel with a split-type hub is presented. Since cost plays a decisive role in stationary flywheel energy storage applications, a trade-off between energy and cost is required. Applying a scaling technique, ... Keywords: Cost optimization, Flywheel energy storage, Flywheel rotors, Multifidelity optimization, Split-type hub, Surrogate-based optimization

Malte Krack; Marc Secanell; Pierre Mertiny

2011-07-01T23:59:59.000Z

286

2274 IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS, VOL. 9, NO. 4, NOVEMBER 2013 Rotor Bar Fault Monitoring Method Based on  

E-Print Network (OSTI)

utilizes the data analysis of the air-gap torque profile in conjunction with a Bayesian classifier, and abrupt load changes, which can produce bearing faults and rotor bar breakages. Meanwhile, electrical Monitoring Method Based on Analysis of Air-Gap Torques of Induction Motors Aderiano M. da Silva, Member, IEEE

Povinelli, Richard J.

287

Wind turbine rotor blade with in-plane sweep and devices using same, and methods for making same  

DOE Patents (OSTI)

A wind turbine includes a rotor having a hub and at least one blade having a torsionally rigid root, an inboard section, and an outboard section. The inboard section has a forward sweep relative to an elastic axis of the blade and the outboard section has an aft sweep.

Wetzel, Kyle Kristopher (Lawrence, KS)

2008-03-18T23:59:59.000Z

288

The Simple Harmonic Rotor with Motion Hinged By of a Helicopter  

E-Print Network (OSTI)

Summary.--In simple harmonic oscillation of the helicopter with hinged blades, the tip-path plane is tilted with respect to the shaft in the plane of oscillation and in the plane perpendicular to it. The angles of tilt can be expressed as functions of angular velocity and acceleration. The influence ' of the acceleration term on the dynamic stability of the helicopter is small. The expressions for angles of tilt due to angular velocity can be simplified to the expressions obtained in previous work under assumptions of quasi-static conditions. 1. I~troductio~.--It has been shown in Ref. 1 that when the rotor shaft of a helicopter tilts with constant pitching velocity, the tip-path plane lags behind the shaft and also tilts Sideways. These angles of lag and sidetilt were found to be proportional to the pitching velocity of the shaft and the following expressions were derived: Oal _. Of yD............. (1)

J. K. Zbrozek; Dipl. Eng; J. K. Zbxoze

1949-01-01T23:59:59.000Z

289

Hydrodynamic Optimization Method and Design Code for Stall-Regulated Hydrokinetic Turbine Rotors  

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

5021 5021 August 2009 Hydrodynamic Optimization Method and Design Code for Stall-Regulated Hydrokinetic Turbine Rotors D. Sale University of Tennessee J. Jonkman and W. Musial National Renewable Energy Laboratory Presented at the ASME 28 th International Conference on Ocean, Offshore, and Arctic Engineering Honolulu, Hawaii May 31-June 5, 2009 NOTICE The submitted manuscript has been offered by an employee of the Alliance for Sustainable Energy, LLC (ASE), a contractor of the US Government under Contract No. DE-AC36-08-GO28308. Accordingly, the US Government and ASE retain a nonexclusive royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for US Government purposes. This report was prepared as an account of work sponsored by an agency of the United States government.

290

Rotational damping in a multi-$j$ shell particles-rotor model  

E-Print Network (OSTI)

The damping of collective rotational motion is investigated by means of particles-rotor model in which the angular momentum coupling is treated exactly and the valence nucleons are in a multi-$j$ shell mean-field. It is found that the onset energy of rotational damping is around 1.1 MeV above yrast line, and the number of states which form rotational band structure is thus limited. The number of calculated rotational bands around 30 at a given angular momentum agrees qualitatively with experimental data. The onset of rotational damping takes place gradually as a function of excitation energy. It is shown that the pairing correlation between valence nucleons has a significant effect on the appearance of rotational damping.

Lu Guo; Jie Meng; Enguang Zhao; Fumihiko Sakata

2004-07-25T23:59:59.000Z

291

The influence of crack-imbalance orientation and orbital evolution for an extended cracked Jeffcott rotor  

E-Print Network (OSTI)

Vibration peaks occurring at rational fractions of the fundamental rotating critical speed, here named Local Resonances, facilitate cracked shaft detection during machine shut-down. A modified Jeffcott-rotor on journal bearings accounting for gravity effects and oscillating around nontrivial equilibrium points is employed. Modal parameter selection allows this linear model to represent first mode characteristics of real machines. Orbit evolution and vibration patterns are analyzed, yielding useful results. Crack detection results indicate that, instead of 1x and 2x components, analysis of the remaining local resonances should have priority; this is due to crack-residual imbalance interaction and to 2x multiple induced origins. Therefore, local resonances and orbital evolution around 1/2, 1/3 and 1/4 of the critical speed are emphasized for various crack-imbalance orientations.

Julio Gomez-Mancilla; Jean-Jacques Sinou; V. R. Nosov; Fabrice Thouverez; A. Zambrano

2008-01-19T23:59:59.000Z

292

Rotor Speed Dependent Yaw Control of Wind Turbines Based on Empirical Data  

Science Conference Proceedings (OSTI)

When extracting energy from the wind using horizontal-axis upwind wind turbines, a primary condition for maximum power yield is the ability to align the rotor axis with the dominating wind direction. Attempts have been made to improve yaw alignment by applying advanced measurement techniques such as LIDARs. This study is focused at assessing the current performance of an operating turbine and exploring how the yaw alignment can be improved using existing measurements. By analyzing available turbine and met mast data a correction scheme for the original yaw alignment system is synthesized. The correction scheme is applied and it is seen that with the correction scheme in place, the power yield below rated is raised 1-5 percent. Furthermore, results indicate that blade load variations are decreased when the correction scheme is applied. The results are associated with uncertainties due to the amount of available data and the wind site climate. Further work should be focused at gathering more experimental data.

Kragh, K. A.; Fleming, P. A.

2012-01-01T23:59:59.000Z

293

Observation of high-order quantum resonances in the kicked rotor  

E-Print Network (OSTI)

Quantum resonances in the kicked rotor are characterized by a dramatically increased energy absorption rate, in stark contrast to the momentum localization generally observed. These resonances occur when the scaled Planck's constant hbar=(r/s)*4pi, for any integers r and s. However only the hbar=r*2pi resonances are easily observable. We have observed high-order quantum resonances (s>2) utilizing a sample of low temperature, non-condensed atoms and a pulsed optical standing wave. Resonances are observed for hbar=(r/16)*4pi r=2-6. Quantum numerical simulations suggest that our observation of high-order resonances indicates a larger coherence length than expected from an initially thermal atomic sample.

J. F. Kanem; S. Maneshi; M. Partlow; M. Spanner; A. M. Steinberg

2006-04-15T23:59:59.000Z

294

The effect of imbalance distribution and measurement locations on critical speeds in a turboprop engine rotor  

E-Print Network (OSTI)

The critical speeds of a turbomachine can be defined as the speeds at which synchronous response to imbalance is maximum (Vance,1988). Identifying the proper placement of critical speeds is very important in the design process of turbomachinery. This study examines the influence of imbalance distribution and vibration measurement location on critical speeds for a model turboprop engine rotor. Imbalance response measurements are presented for a full scale model mounted in rolling bearings with squeeze film damper. The measurements were recorded with a Bentley Nevada ADRE 208 Data Acquisition Interface Unit System. These measurements are compared with predictions from a XLROTOR (Spreadsheet for Rotordynamic Analysis) computer model. Measurement imbalance responses show that imbalance location has profound influence on critical speeds. A critical speed variation up to 25 % was found. Comparison between the XLROTOR computer model prediction and measurement shows excellent agreement.

Marin, Manuel

1996-01-01T23:59:59.000Z

295

Wind energy conversion. Volume X. Aeroelastic stability of wind turbine rotor blades  

DOE Green Energy (OSTI)

The nonlinear equations of motion of a general wind turbine rotor blade are derived from first principles. The twisted, tapered blade may be preconed out of the plane of rotation, and its root may be offset from the axis of rotation by a small amount. The aerodynamic center, center of mass, shear center, and area centroid are distinct in this derivation. The equations are applicable to studies of forced response or of aeroelastic flutter, however, neither gravity forcing, nor wind shear and gust forcing are included. The equations derived are applied to study the aeroelastic stability of the NASA-ERDA 100 kW wind turbine, and solved using the Galerkin method. The numerical results are used in conjunction with a mathematical comparison to prove the validity of an equivalent hinge model developed by the Wind Energy Conversion Project at the Massachusetts Institute of Technology.

Wendell, J.

1978-09-01T23:59:59.000Z

296

Rotationally sampled wind characteristics for several rotor sizes using laser anemometer measurements  

DOE Green Energy (OSTI)

The concept of measuring the wind velocity rotationally around crosswind circles using a circle-scanning Doppler laser anemometer is investigated to determine the technique's suitability as an effective, simple, economical, and nonintrusive method for estimation turbulence at a wind turbine rotor. Estimates of wind features obtained using the lidar technique are compared to actual wind measurements obtained using a vertical plane array of anemometers, and to other estimates generated using a single-tower technique. Although the lack of a common data set precludes a firm conclusion regarding the lidar method's accuracy, it appears that the rotationally scanning lidar has the potential of becoming an excellent tool for measuring turbulent wind around the disk of rotation of a turbine blade. 11 refs., 21 figs., 2 tabs.

Connell, J.R.; Morris, V.R.

1989-02-01T23:59:59.000Z

297

An efficient algorithm for blade loss simulations applied to a high-order rotor dynamics problem  

E-Print Network (OSTI)

In this thesis, a novel approach is presented for blade loss simulation of an aircraft gas turbine rotor mounted on rolling element bearings with squeeze film dampers, seal rub and enclosed in a flexible housing. The modal truncation augmentation (MTA) method provides an efficient tool for modeling this large order system with localized nonlinearities in the ball bearings. The gas turbine engine, which is composed of the power turbine and gas generator rotors, is modeled with 38 lumped masses. A nonlinear angular contact bearing model is employed, which has ball and race degrees of freedom and uses a modified Hertzian contact force between the races and balls and for the seal rub. This combines a dry contact force and viscous damping force. A flexible housing with seal rub is also included whose modal description is imported from ANSYS. Prediction of the maximum contact load and the corresponding stress on an elliptical contact area between the races and balls is made during the blade loss simulations. A finite-element based squeeze film damper (SFD), which determines the pressure profile of the oil film and calculates damper forces for any type of whirl orbit is utilized in the simulation. The new approach is shown to provide efficient and accurate predictions of whirl amplitudes, maximum contact load and stress in the bearings, transmissibility, thermal growths, maximum and minimum damper pressures and the amount of unbalanced force for incipient oil film cavitation. It requires about 4 times less computational time than the traditional approaches and has an error of less than 5 %.

Parthasarathy, Nikhil Kaushik

2003-12-01T23:59:59.000Z

298

WindPACT Turbine Design Scaling Studies Technical Area 1ÂŒComposite Blades for 80- to 120-Meter Rotor  

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

1 * NREL/SR-500-29492 1 * NREL/SR-500-29492 Dayton A. Griffin Global Energy Concepts Kirkland, Washington WindPACT Turbine Design Scaling Studies Technical Area 1-Composite Blades for 80- to 120-Meter Rotor March 21, 2000 - March 15, 2001 National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401-3393 NREL is a U.S. Department of Energy Laboratory Operated by Midwest Research Institute * * * * Battelle * * * * Bechtel Contract No. DE-AC36-99-GO10337 April 2001 * NREL/SR-500-29492 WindPACT Turbine Design Scaling Studies Technical Area 1-Composite Blades for 80- to 120-Meter Rotor March 21, 2000 - March 15, 2001 Dayton A. Griffin Global Energy Concepts Kirkland, Washington NREL Technical Monitor: Alan Laxson Prepared under Subcontract No. YAM-0-30203-01 National Renewable Energy Laboratory

299

WindPACT Turbine Design Scaling Studies Technical Area 1-Composite Blades for 80- to 120-Meter Rotor  

SciTech Connect

The United States Department of Energy (DOE) through the National Renewable Energy Laboratory (NREL) implemented the Wind Partnership for Advanced Component Technologies (WindPACT) program. As part of the WindPACT program, Global Energy Concepts, LLC (GEC), was awarded contract number YAM-0-30203-01 to examine Technical Area 1-Blade Scaling, Technical Area 2-Turbine Rotor and Blade Logistics, and Technical Area 3-Self-Erecting Towers. This report documents the results of GEC's Technical Area 1-Blade Scaling. The primary objectives of the Blade-Scaling Study are to assess the scaling of current materials and manufacturing technologies for blades of 40 to 60 meters in length, and to develop scaling curves of estimated cost and mass for rotor blades in that size range.

Griffin, D.A.

2001-04-30T23:59:59.000Z

300

WindPACT Turbine Rotor Design, Specific Rating Study; Period of Performance: June 29, 2000--March 1, 2003  

DOE Green Energy (OSTI)

In 2000, the National Renewable Energy Laboratory (NREL) launched the Wind Partnerships for Advanced Component Technologies (WindPACT) program to examine ways in which the cost of wind energy could be reduced a further 30%. One element of the WindPACT program has been a series of design studies aimed at each of the major subsystems of the wind turbine to study the effect of scale and of alternative design approaches. The WindPACT Turbine Rotor Design Study was carried out by Global Energy Concepts, LLC, (GEC) on behalf of NREL, and the final report was delivered in June 2002. The study examined what configuration and design changes in the rotor would reduce the overall cost of energy. The objectives of this report are to use the 1.5-MW baseline configuration from the earlier WindPACT Rotor Design Study to examine the effect of different power ratings and to identify an optimum specific rating; to examine the effect of different maximum tip speeds on overall cost of energy (COE); to examine the role of different wind regimes on the optimum specific rating; and to examine how the optimum specific rating may be affected by introducing more advanced blade designs.

Malcolm, D. J.; Hansen, A. C.

2003-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Shifting the boundaries: pulse-shape effects in the atom-optics kicked rotor  

E-Print Network (OSTI)

We present the results of experiments performed on cold caesium in a pulsed sinusoidal optical potential created by counter-propagating laser beams having a small frequency difference in the laboratory frame. Since the atoms, which have average velocity close to zero in the laboratory frame, have non-zero average velocity in the co-moving frame of the optical potential, we are able to centre the initial velocity distribution of the cloud at an arbitrary point in phase-space. In particular, we demonstrate the use of this technique to place the initial velocity distribution in a region of phase-space not accessible to previous experiments, namely beyond the momentum boundaries arising from the finite pulse duration of the potential. We further use the technique to explore the kicked rotor dynamics starting from a region of phase-space where there is a strong velocity dependence of the diffusion constant and quantum break time and demonstrate that this results in a marked asymmetry in the chaotic evolution of the atomic momentum distribution.

P. H. Jones; M. Goonasekera; H. E. Saunders-Singer; D. R. Meacher

2003-11-18T23:59:59.000Z

302

Theory of localization and resonance phenomena in the quantum kicked rotor  

E-Print Network (OSTI)

We present an analytic theory of quantum interference and Anderson localization in the quantum kicked rotor (QKR). The behavior of the system is known to depend sensitively on the value of its effective Planck's constant $\\he$. We here show that for rational values of $\\he/(4\\pi)=p/q$, it bears similarity to a disordered metallic ring of circumference $q$ and threaded by an Aharonov-Bohm flux. Building on that correspondence, we obtain quantitative results for the time--dependent behavior of the QKR kinetic energy, $E(\\tilde t)$ (this is an observable which sensitively probes the system's localization properties). For values of $q$ smaller than the localization length $\\xi$, we obtain scaling $E(\\tilde t) \\sim \\Delta \\tilde t^2$, where $\\Delta=2\\pi/q$ is the quasi--energy level spacing on the ring. This scaling is indicative of a long time dynamics that is neither localized nor diffusive. For larger values $q\\gg \\xi$, the functions $E(\\tilde t)\\to \\xi^2$ saturates (up to exponentially small corrections $\\sim\\exp(-q/\\xi)$), thus reflecting essentially localized behavior.

C. Tian; A. Altland

2010-01-25T23:59:59.000Z

303

Spectral Relationships Between Kicked Harper and On-Resonance Double Kicked Rotor Operators  

E-Print Network (OSTI)

Kicked Harper operators and on-resonance double kicked rotor operators model quantum systems whose semiclassical limits exhibit chaotic dynamics. Recent computational studies indicate a striking resemblance between the spectrums of these operators. In this paper we apply C*-algebra methods to explain this resemblance. We show that each pair of corresponding operators belong to a common rotation C*-algebra B_\\alpha, prove that their spectrums are equal if \\alpha is irrational, and prove that the Hausdorff distance between their spectrums converges to zero as q increases if \\alpha = p/q with p and q coprime integers. Moreover, we show that corresponding operators in B_\\alpha are homomorphic images of mother operators in the universal rotation C*-algebra A_\\alpha that are unitarily equivalent and hence have identical spectrums. These results extend analogous results for almost Mathieu operators. We also utilize the C*-algebraic framework to develop efficient algorithms to compute the spectrums of these mother operators for rational \\alpha and present preliminary numerical results that support the conjecture that their spectrums are Cantor sets if \\alpha is irrational. This conjecture for almost Mathieu operators, called the Ten Martini Problem, was recently proved after intensive efforts over several decades. This proof for the almost Mathieu operators utilized transfer matrix methods, which do not exist for the kicked operators. We outline a strategy, based on a special property of loop groups of semisimple Lie groups, to prove this conjecture for the kicked operators.

Wayne Lawton; Anders S. Mouritzen; Jiao Wang; Jiangbin Gong

2008-07-27T23:59:59.000Z

304

Evaluation of Manufacturability of Embedded Sensors and Controls with Canned Rotor Pump System  

SciTech Connect

This report documents the current status of fabrication and assembly planning for the magnetic bearing, canned rotor pump being used as a demonstration platform for deeply integrating I&C into nuclear power plant components. The report identifies material choices and fabrication sequences for all of the required parts and the issues that need to be either resolved or accommodated during the manufacturing process. Down selection between material options has not yet been performed. Potential suppliers for all of the necessary materials have also been identified. The assembly evaluation begins by logically subdividing the pump into modules, which are themselves decomposed into individual parts. Potential materials and fabrication processes for each part in turn are then evaluated. The evaluation process includes assessment of the environmental compatibility requirements and the tolerances available for the selected fabrication processes. A description of the pump power/control electronics is also provided. The report also includes exploded views of the modules that show the integration of the various parts into modules that are then assembled to form the pump. Emphasis has been placed on thermal environment compatibility and the part dimensional changes during heat-up. No insurmountable fabrication or assembly challenges have been identified.

Kisner, Roger A [ORNL; Fugate, David L [ORNL; Melin, Alexander M [ORNL; Holcomb, David Eugene [ORNL; Wilson, Dane F [ORNL; Silva, Pamela C [ORNL; Cruz Molina, Carola [ORNL

2013-07-01T23:59:59.000Z

305

Ceramic turbine components research and development. Part 1. Ceramic rotor-blade development. Final report  

SciTech Connect

The principal objective of this program was to develop (through design, analysis and laboratory spin testing) the design techniques for uncooled ceramic rotor blades. Present-day materials, fabrication techniques and system operating conditions were assumed in the program. The unique compound curvature dovetail attachment concept was generated and two configurations of this concept were generated for detailed study. In addition a three-piece blade assembly consisting of ceramic blade/superalloy intermediate piece/metal disk was conceived. An additional important design feature was the use of a compliant layer pad between ceramic and metal contact surfaces. Silicon nitride root forms of two preliminary root designs with flat surface dovetails and of the two configurations with compound curvature dovetails were manufactured and spin tested to failure with very encouraging results. A statistical assessment of failures was conducted by combining results from finite element stress analysis and the statistical mechanical properties of Norton NC 132 silicon nitride. This provided a failure prediction method that correlated well with the spin test results. The significant influence of surface finish that translates to surface flaw severity and orientation was dramatically illustrated in this study and points to the need for improved methods of manufacturing ceramic components for gas turbine application.

Anderson, C.A.; Boorer, C.R. Jr.

1980-08-01T23:59:59.000Z

306

Development of a light-weight, wind-turbine-rotor-based data acquisition system  

DOE Green Energy (OSTI)

Wind-energy researchers at Sandia National Laboratories (SNL) and the National Renewable Energy Laboratory (NREL) are developing a new, light-weight, modular system capable of acquiring long-term, continuous time-series data from current-generation small or large, dynamic wind-turbine rotors. Meetings with wind-turbine research personnel at NREL and SNL resulted in a list of the major requirements that the system must meet. Initial attempts to locate a commercial system that could meet all of these requirements were not successful, but some commercially available data acquisition and radio/modem subsystems that met many of the requirements were identified. A time synchronization subsystem and a programmable logic device subsystem to integrate the functions of the data acquisition, the radio/modem, and the time synchronization subsystems and to communicate with the user have been developed at SNL. This paper presents the data system requirements, describes the four major subsystems comprising the system, summarizes the current status of the system, and presents the current plans for near-term development of hardware and software.

Berg, D.E.; Rumsey, M.; Robertson, P. [Sandia National Labs., Albuquerque, NM (United States); Kelley, N.; McKenna, E. [National Renewable Energy Lab., Golden, CO (United States); Gass, K. [Utah State Univ., Logan, UT (United States)

1997-12-01T23:59:59.000Z

307

WindPACT Turbine Design Scaling Studies Technical Area 2: Turbine, Rotor and Blade Logistics  

SciTech Connect

Through the National Renewable Energy Laboratory (NREL), the United States Department of Energy (DOE) implemented the Wind Partnership for Advanced Component Technologies (WindPACT) program. This program will explore advanced technologies that may reduce the cost of energy (COE) from wind turbines. The initial step in the WindPACT program is a series of preliminary scaling studies intended to determine the optimum sizes for future turbines, help define sizing limits for certain critical technologies, and explore the potential for advanced technologies to contribute to reduced COE as turbine scales increase. This report documents the results of Technical Area 2-Turbine Rotor and Blade Logistics. For this report, we investigated the transportation, assembly, and crane logistics and costs associated with installation of a range of multi-megawatt-scale wind turbines. We focused on using currently available equipment, assembly techniques, and transportation system capabilities and limitations to hypothetically transport and install 50 wind turbines at a facility in south-central South Dakota.

Smith, K.

2001-07-16T23:59:59.000Z

308

Apparatus and methods for aligning holes through wheels and spacers and stacking the wheels and spacers to form a turbine rotor  

DOE Patents (OSTI)

A gas turbine rotor stacking fixture includes upstanding bolts for reception in aligned bolt holes in superposed aft disk, wheels and spacers and upstanding alignment rods received in openings of the disk, wheels and spacers during the rotor stacking assembly. The axially registering openings enable insertion of thin-walled tubes circumferentially about the rim of the rotor, with tight tolerances to the openings to provide supply and return steam for cooling buckets. The alignment rods have radial dimensions substantially less than their dimensions in a circumferential direction to allow for radial opening misalignment due to thermal expansion, tolerance stack-up and wheel-to-spacer mismatch due to rabbet mechanical growth. The circumferential dimension of the alignment rods affords tightly toleranced alignment of the openings through which the cooling tubes are installed.

Berry, Robert Randolph (Greenville, SC); Palmer, Gene David (Clifton Park, NY); Wilson, Ian David (Clifton Park, NY)

2000-01-01T23:59:59.000Z

309

Measurement in a wind tunnel of the modification of mean wind and turbulence characteristics due to induction effects near wind turbine rotors  

DOE Green Energy (OSTI)

It is the purpose of this report to provide experimental data on the wind field surrounding a single model wind turbine rotor disk. These data should provide an improved physical insight into the induction effects of the air flow as it approaches the wind turbine. This insight should in turn improve an analytical model's predictive capabilities. A scaled model of a horizontal-axis wind turbine (a two-bladed rotor of diameter 53 cm) was placed into the Meteorological Wind Tunnel (MWT) facility at Colorado State University (cross-section width of 183 cm). Four different approach flow conditions were studied: low and moderate turbulence levels (0.1% and 1.5% intensity) at both 6 and 7.6 m/s freestream air velocities. For each of these flow conditions the rotor power coefficient versus tip speed ratio was obtained, and the 3-dimensional velocity field from 3 rotor diameters upwind to 0.5 diameter downwind was tabulated. The power output of the rotor was obtained via a simple prony brake friction device that imparts a torque (measured by the deflection of a spring) to the spinning shaft of the wind turbine. The rotor speed, measured by a strobe light, was observed to vary with load from 900 rpm up to 2100 rpm for the flow conditions described above. The 3-dimensional velocity field was measured via a three-hot-film probe. Details of the measurement techniques are provided. The test program and data results are also given. A short discussion of the implications of this data set is included. 12 refs., 19 figs., 11 tabs.

Neff, D.E.; Meroney, R.N.

1987-08-01T23:59:59.000Z

310

The theta^+ baryon in soliton models: large Nc QCD and the validity of rigid-rotor quantization  

E-Print Network (OSTI)

A light collective theta+ baryon state (with strangeness +1) was predicted via rigid-rotor collective quantization of SU(3) chiral soliton models. This paper explores the validity of this treatment. A number of rather general analyses suggest that predictions of exotic baryon properties based on this approximation do not follow from large Nc QCD. These include an analysis of the baryon's width, a comparison of the predictions with general large Nc consistency conditions of the Gervais-Sakita-Dashen-Manohar type; an application of the technique to QCD in the limit where the quarks are heavy; a comparison of this method with the vibration approach of Callan and Klebanov; and the 1/Nc scaling of the excitation energy. It is suggested that the origin of the problem lies in an implicit assumption in the that the collective motion is orthogonal to vibrational motion. While true for non-exotic motion, the Wess-Zumino term induces mixing at leading order between collective and vibrational motion with exotic quantum numbers. This suggests that successful phenomenological predictions of theta+ properties based on rigid-rotor quantization were accidental.

Thomas D. Cohen

2003-12-15T23:59:59.000Z

311

Wake of the MOD-0A1 wind turbine at two rotor diameters downwind on December 3, 1981  

DOE Green Energy (OSTI)

The wake of the MOD-0A1 wind turbine at Clayton, New Mexico has been measured using a vertical plane array of anemometers in a crosswind plane at a distance of two rotor diameters directly downwind of the turbine. Rotor blade vortices were well mixed into the wake turbulence and were not separately detectable. Wake swirl about the along-wind axis had a value not greater than 0.025 rad/s. Extra turbulence energy existed in the edge of the wake at a frequency of about n=0.025 Hz. The cross-wake plane analyses of wind speeds revealed a nearly circular inner portion and a strongly elliptical portion. The elliptical portion major axis was horizontal. An estimate of the average rate of reenergizing of the wake, using measurements of mean wind energy flow and turbine power, suggests that entrainment with ambient air may have been rapid. Some wake characteristics were compared with the corresponding ones for several simple wake models based upon concepts of mixing of ambient air into a wake or an equivalent coaxial jet. (LEW)

Connell, J.R.; George, R.L.

1982-11-01T23:59:59.000Z

312

The Evolution of Lee-Wave–Rotor Activity in the Lee of Pike’s Peak under the Influence of a Cold Frontal Passage: Implications for Aircraft Safety  

Science Conference Proceedings (OSTI)

A lee-wave–rotor system interacting with an approaching cold front in the lee of Pike’s Peak near Colorado Springs, Colorado, on 1 April 1997 is studied observationally and numerically. Dynamical effects associated with the approaching cold front ...

Lisa S. Darby; Gregory S. Poulos

2006-10-01T23:59:59.000Z

313

Preliminary Structural Design Conceptualization for Composite Rotor for Verdant Power Water Current: Cooperative Research and Development Final Report, CRADA Number CRD-08-296  

DOE Green Energy (OSTI)

The primary thrust of the CRADA will be to develop a new rotor design that will allow higher current flows (>4m/s), greater swept area (6-11m), and in the process, will maximize performance and energy capture.

Hughes, S.

2011-02-01T23:59:59.000Z

314

There has been recent interest in the application of the tilt-rotor concept to civil aviation. The concept offers the speed and altitude capability of the turbojet  

E-Print Network (OSTI)

Hybrid electric will be explored. The impact of engine location and Part-Span tilt wing will also of a helicopter. Such a vehicle could fill a number of niches in the aviation market. Some tilt-rotor studies have through the application of new technologies to the concept. Advanced materials and systems, including

315

Brouwer's problem on a heavy particle in a rotating vessel: wave propagation, ion traps, and rotor dynamics  

E-Print Network (OSTI)

In 1918 Brouwer considered stability of a heavy particle in a rotating vessel. This was the first demonstration of a rotating saddle trap which is a mechanical analogue for quadrupole particle traps of Penning and Paul. We revisit this pioneering work in order to uncover its intriguing connections with classical rotor dynamics and fluid dynamics, stability theory of Hamiltonian and non-conservative systems as well as with the modern works on crystal optics and atomic physics. In particular, we find that the boundary of the stability domain of the undamped Brouwer's problem possesses the Swallowtail singularity corresponding to the quadruple zero eigenvalue. In the presence of dissipative and non-conservative positional forces there is a couple of Whitney umbrellas on the boundary of the asymptotic stability domain. The handles of the umbrellas form a set where all eigenvalues of the system are pure imaginary despite the presence of dissipative and non-conservative positional forces.

Oleg N. Kirillov

2010-12-04T23:59:59.000Z

316

Development and application of a light-weight, wind-turbine rotor-based data acquisition system  

DOE Green Energy (OSTI)

Wind-energy researchers at the National Wind Technology Center (NWTC), representing Sandia National Laboratories (SNL) and the National Renewable Energy Laboratory (NREL), are developing a new, light-weight, modular data acquisition unit capable of acquiring long-term, continuous time-series data from small and/or dynamic wind-turbine rotors. The unit utilizes commercial data acquisition hardware, spread-spectrum radio modems, and Global Positioning System receivers, and a custom-built programmable logic device. A prototype of the system is now operational, and initial field deployment is expected this summer. This paper describes the major subsystems comprising the unit, summarizes the current status of the system, and presents the current plans for near-term development of hardware and software.

Berg, D.E.; Robertson, P.J.; Ortiz, M.F. [Sandia National Labs., Albuquerque, NM (United States)

1998-04-01T23:59:59.000Z

317

Impact of Rotor Surface Velocity, Leakage Models and Real Gas Properties on Rotordynamic Force Predictions of Gas Labyrinth Seals  

E-Print Network (OSTI)

Rotordynamic coefficients of a gas labyrinth seal are assumed to be frequency independent. However, this assumption loses its validity as rotor surface velocity approaches Mach 1. The solution procedure of 1CV model by Childs and Scharrer which assumes frequency independent force coefficients is modified to allow for calculating frequency dependent force coefficients. A comparative study of the impact of using frequency-dependent model and the original frequency-independent model on stability analysis is made. The results indicate that frequency dependency of force coefficients should be accounted for in stability analysis as rotor surface velocity approaches a significant fraction of Mach number. The bulk flow rotordynamic analysis model by Childs and Scharrer is modified to investigate the impact of leakage-flow models on predictions. A number of leakage models are incorporated in the one-control volume model, and a comparative study is made. Kinetic energy carryover factor of a leakage equation is one of the dominant factors in seal cross-force generation. A leakage equation based on a model proposed by Gamal which uses Hodkinson?s kinetic energy carryover factor is found to improve predictions of direct damping and cross-coupled stiffness. A test case is implemented to study the impact of variation of seal axial radial clearance on stability characteristics. The 1CV model by Childs and Scharrer and subsequent bulk flow models are based on the assumption of isothermal flow across the labyrinth seal. The 1CV model by Childs and Scharrer is modified to include energy equation, and the flow process is assumed to be adiabatic. However, predicted cross-coupled stiffness and direct damping coefficients using the new model do not compare well with the experimental results by Picardo as compared to the isothermal model. The impact of using real gas properties on static and rotordynamic characteristics of the seal is studied.

Thorat, Manish R.

2010-05-01T23:59:59.000Z

318

WindPACT Turbine Design Scaling Studies Technical Area 2: Turbine, Rotor, and Blade Logistics; March 27, 2000 to December 31, 2000  

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

1 * NREL/SR-500-29439 1 * NREL/SR-500-29439 Kevin Smith Global Energy Concepts LLC Kirkland, Washington WindPACT Turbine Design Scaling Studies Technical Area 2: Turbine, Rotor, and Blade Logistics March 27, 2000 to December 31, 2000 National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401-3393 NREL is a U.S. Department of Energy Laboratory Operated by Midwest Research Institute * * * * Battelle * * * * Bechtel Contract No. DE-AC36-99-GO10337 June 2001 * NREL/SR-500-29439 WindPACT Turbine Design Scaling Studies Technical Area 2: Turbine, Rotor, and Blade Logistics March 27, 2000 to December 31, 2000 Kevin Smith Global Energy Concepts LLC Kirkland, Washington NREL Technical Monitor: Alan Laxson Prepared under Subcontract No. YAM-0-30203-01 National Renewable Energy Laboratory

319

Analysis of the Madaras Rotor Power Plant: an alternate method for extracting large amounts of power from the wind. Volume 2. Technical report  

DOE Green Energy (OSTI)

The purpose of the program was to analyze and up-date the design of the Madaras Rotor Power Plant concept that had been developed in the 1930's to determine the technical and economic feasibility of this system to be competitive with conventional horizontal axis wind turbines. A four-task program consisting of a series of wind tunnel tests, an electro-mechanical analysis, a performance analysis, and a cost analysis was conducted.

Whitford, D.H.; Minardi, J.E.; West, B.S.; Dominic, R.J.

1978-06-01T23:59:59.000Z

320

Results of the ROTOR-program. I. The long-term photometric variability of classical T Tauri stars  

E-Print Network (OSTI)

We present a unique, homogeneous database of photometric measurements for Classical T Tauri stars extending up to 20 years. The database contains more than 21,000 UBVR observations of 72 CTTs. All the data were collected within the framework of the ROTOR-program at Mount Maidanak Observatory (Uzbekistan) and together they constitute the longest homogeneous, accurate record of TTS variability ever assembled. We characterize the long term photometric variations of 49 CTTs with sufficient data to allow a robust statistical analysis and propose an empirical classification scheme. Several patterns of long term photometric variability are identified. The most common pattern, exhibited by a group of 15 stars which includes T Tau itself, consists of low level variability (Delta(V)<=0.4mag) with no significant changes occurring from season to season over many years. A related subgroup of 22 stars exhibits a similar stable long term variability pattern, though with larger amplitudes (up to Delta(V)~1.6 mag). Besides these representative groups, we identify three smaller groups of 3-5 stars each which have distinctive photometric properties. The long term variability of most CTTs is fairly stable and merely reflects shorter term variability due to cold and hot surface spots. Only a small fraction of CTTs undergo significant brightness changes on the long term (months, years), which probably arise from slowly varying circumstellar extinction.

K. N. Grankin; S. Yu. Melnikov; J. Bouvier; W. Herbst; V. S. Shevchenko

2006-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Sensitivity of transitions in internal rotor molecules to a possible variation of the proton-to-electron mass ratio  

Science Conference Proceedings (OSTI)

Recently, methanol was identified as a sensitive target system to probe variations of the proton-to-electron mass ratio {mu}[Jansen et al., Phys. Rev. Lett. 106, 100801 (2011)]. The high sensitivity of methanol originates from the interplay between overall rotation and hindered internal rotation of the molecule; that is, transitions that convert internal rotation energy into overall rotation energy, or vice versa, have an enhanced sensitivity coefficient, K{sub {mu}}. As internal rotation is a common phenomenon in polyatomic molecules, it is likely that other molecules display similar or even larger effects. In this paper we generalize the concepts that form the foundation of the high sensitivity in methanol and use this to construct an approximate model which makes it possible to estimate the sensitivities of transitions in internal rotor molecules with C{sub 3v} symmetry, without performing a full calculation of energy levels. We find that a reliable estimate of transition sensitivities can be obtained from the three rotational constants (A, B, and C) and three torsional constants (F, V{sub 3}, and {rho}). This model is verified by comparing obtained sensitivities for methanol, acetaldehyde, acetamide, methyl formate, and acetic acid with a full analysis of the molecular Hamiltonian. Of the molecules considered, methanol is by far the most suitable candidate for laboratory and cosmological tests searching for a possible variation of {mu}.

Jansen, Paul; Ubachs, Wim; Bethlem, Hendrick L. [Institute for Lasers, Life and Biophotonics, VU University Amsterdam, De Boelelaan 1081, NL-1081 HV Amsterdam (Netherlands); Kleiner, Isabelle [Laboratoire Interuniversitaire des Systemes Atmospheriques (LISA), CNRS UMR 7583 et Universites Paris 7 et Paris Est, 61 avenue du General de Gaulle, FR-94010 Creteil Cedex (France); Xu, Li-Hong [Department of Physics and Centre for Laser, Atomic, and Molecular Sciences, University of New Brunswick, Saint John, New Brunswick, Canada E2L 4L5 (Canada)

2011-12-15T23:59:59.000Z

322

User's guide for a personal computer model of turbulence at a wind turbine rotor  

DOE Green Energy (OSTI)

This document is primarily (1) a user's guide for the personal computer (PC) version of the code for the PNL computational model of the rotationally sampled wind speed (RODASIM11) and (2) a brief guide to the growing literature on the subject of rotationally sampled turbulence, from which the model is derived. The model generates values of turbulence experienced by single points fixed in the rotating frame of reference of an arbitrary wind turbine blade. The character of the turbulence depends on the specification of mean wind speed, the variance of turbulence, the crosswind and along-wind integral scales of turbulence, mean wind shear, and the hub height, radius, and angular speed of rotation of any point at which wind fluctuation is to be calculated. 13 refs., 4 figs., 4 tabs.

Connell, J.R.; Powell, D.C.; Gower, G.L.

1989-08-01T23:59:59.000Z

323

Kicked-Harper model vs On-Resonance Double Kicked Rotor Model: From Spectral Difference to Topological Equivalence  

E-Print Network (OSTI)

Recent studies have established that, in addition to the well-known kicked Harper model (KHM), an on-resonance double kicked rotor model (ORDKR) also has Hofstadter's butterfly Floquet spectrum, with strong resemblance to the standard Hofstadter's spectrum that is a paradigm in studies of the integer quantum Hall effect. Earlier it was shown that these quasi-energy spectra of the two dynamical models can (i) exactly overlap with each other if an effective Planck constant takes irrational multiples of $2\\pi$ and (ii) will be different if the same parameter takes rational multiples of $2\\pi$. This work makes some detailed comparison between these two models, with an effective Planck constant given by $2\\pi M/N$, where $M$ and $N$ are coprime integers. It is found that for odd $M$ and $N$, the ORDKR spectrum has one flat band and $N-1$ non-flat bands whose widths decay in power law as $\\sim K^{N+2}$, where $K$ is a kicking strength parameter. The existence of a flat band is strictly proved and the power law scaling, numerically checked for a number of cases, is also analytically proved for a three-band case. By contrast, the KHM does not have any flat band and their band width scales linearly with $K$. This is shown to result in dramatic differences in their dynamical behavior, such as transient (but extremely long) dynamical localization in ORDKR. Finally, we show that despite these differences, from a topological point of view, KHM and ORDRK are actually topologically equivalent. A theoretical derivation of this topological equivalence is provided.

Hailong Wang; Derek Y. H. Ho; Wayne Lawton; Jiao Wang; Jiangbin Gong

2013-06-26T23:59:59.000Z

324

Cold collisions of highly rotationally excited CO{sub 2} with He: The prospects for cold chemistry with super-rotors  

SciTech Connect

Building on recent advances in ultrafast lasers and methods to slow molecules, an experiment is proposed to produce translationally cold CO{sub 2} super-rotors (j{approx}200) by combining an optical centrifuge with helium-buffer-gas cooling. Quantum mechanical calculations of the complex scattering length for He-CO{sub 2} collisions demonstrate that the efficiency of rotational quenching decreases rapidly with increasing rotational excitation j in the ultracold regime. Extrapolating to helium cryogenic temperatures, rotational quenching is predicted to remain inefficient up to {approx}1 K, allowing for the possible creation of a beam of translationally cold, rotationally hot molecules.

Al-Qady, W. H.; Forrey, R. C.; Yang, B. H.; Stancil, P. C.; Balakrishnan, N. [Department of Physics and Astronomy and the Center for Simulational Physics, University of Georgia, Athens, Georgia 30602 (United States); Department of Physics, The Pennsylvania State University, Berks Campus, Reading, Pennsylvania 19610 (United States); Department of Physics and Astronomy and the Center for Simulational Physics, University of Georgia, Athens, Georgia 30602 (United States); Department of Chemistry, University of Nevada-Las Vegas, Las Vegas, Nevada 89154 (United States)

2011-11-15T23:59:59.000Z

325

Performance and Vibratory Loads Data From a Wind-Tunnel Test of a Model Helicopter MainRotor Blade With a Paddle-Type Tip  

E-Print Network (OSTI)

this report as a "BERP-type" blade. The intent of using these two blade sets was to evaluate the effect of the BERP planform geometry on performance and loads, not to conduct an exhaustive study of the BERP concept. The baseline and paddle-type tip blades were compared with regard to rotor performance, oscillatory pitch-link loads, and 4-per-rev vertical fixed-system loads. Data were obtained in hover and forward flight over a nominal range of advance ratios from 0.15 to 0.425. Results indicate that the paddle-type tip offers no performance improvements in either hover or forward flight. Pitchlink oscillatory loads for the paddle-type tip are higher than for the baseline blade, whereas 4-per-rev vertical fixed-system loads are generally lower.

William T. Yeager, Jr.; Kevin W. Noonan; Jeffrey D. Singleton; Matthew L. Wilbur; Paul H. Mirick

1997-01-01T23:59:59.000Z

326

Test versus predictions for rotordynamic and leakage characteristics of a convergent-tapered, honeycomb-stator/smooth-rotor annular gas seal  

E-Print Network (OSTI)

This thesis presents the results for measured and predicted rotordynamic coefficients and leakage for a convergent-tapered honeycomb seal (CTHC). The test seals had a diameter of 114.968 mm (4.5263 in) at the entrance, and a diameter of 114.709 mm (4.5161 in) at the exit. The honeycomb cell depth was 3.175 mm (0.125 in), and the cell width was 0.79 mm (0.0311 in). Measurements are reported with air as the test fluid at three different speeds: 10,200, 15,200, and 20,200 rpm; with a supply pressure of 69 bar (1,000 psi), with exit-to-inlet pressure ratios from 20% to 50%, and using two rotors that are 114.3 mm (4.500 in) and 114.5 mm (4.508 in) respectively; this enables the same seals to be tested under two different conditions. The q factor, which is just a simple way to quantify taper is defined as the taperangle seal parameter and is calculated using the inlet and exit radial clearance. Two taper-angles parameters were calculated; q = 0.24 for the 114.3 mm (4.500 in) rotor, and q = 0.386 for the 114.5 mm (4.508 in) rotor. The q = 0.24 condition was compared to a constant clearance honeycomb seal (CCHC q = 0) because both sets of data were taken with the same rotor diameter. The direct stiffness, effective stiffness, and direct damping coefficients were larger for q = 0.24. The CTHC q = 0.24 eliminates the direct negative static stiffness obtained with CCHC ( q = 0). The cross-coupled stiffness and damping also were larger for q = 0.24, especially at low frequencies. Effective damping is one of the best indicators in determining the stability of a roughened stator annular gas seal. The frequency at which it changes sign is called the cross-over frequency. In applications, this frequency needs to be lower than the rotorsystem’s first natural frequency. Otherwise, the seal will be highly destabilizing instead of highly stabilizing. The magnitude of effective damping and the cross-over frequency also increases with q for all frequencies. Constant clearance honeycomb seals have less leakage than convergenttapered honeycomb seals. CTHC ( q = 0.24), has approximately 20 percent more leakage than CCHC ( q = 0). The experimental results for rotordynamic characteristics and leakage were compared to theoretical predictions by the two-control-volume developed by Kleynhans and Childs. All rotordynamic coefficients were reasonably predicted for all cases. The model does a better job predicting the cross-coupled stiffness and damping coefficients rather than the direct stiffness and damping coefficients. Also, the two-control-volume model predicts the dynamic characteristics of CCHC ( q = 0) better, and does not predict well the effective stiffness and damping for CTHC q = 0.386.

Van Der Velde Alvarez, Daniel Eduardo

2006-12-01T23:59:59.000Z

327

Analysis of the Madaras Rotor Power Plant: an alternate method for extracting large amounts of power from the wind. Executive summary  

DOE Green Energy (OSTI)

The purpose of the program was to analyze and up-date the design of the Madaras Rotor Power Plant concept that had been developed in the 1930's to determine the technical and economic feasibility of this system to be competitive with conventional horizontal axis wind turbines. The Madaras concept uses rotating cylinders, vertically mounted on flat cars, to react with the wind like a sail and propel an endless train of connected cars around a closed track at constant speed. Electricity is generated by alternators on each car that are geared to the wheels. Electrical power is transmitted from each car to the power house by a trolley system. A four-task program consisting of a series of wind tunnel tests, an electro-mechanical analysis, a performance analysis, and a cost analysis was conducted.

Whitford, D.H.; Minardi, J.E.; West, B.S.; Dominic, R.J.

1978-06-01T23:59:59.000Z

328

Experimental verification of a one-parameter scaling law for the quantum and "classical" resonances of the atom-optics kicked rotor  

E-Print Network (OSTI)

We present experimental measurements of the mean energy in the vicinity of the first and second quantum resonances of the atom optics kicked rotor for a number of different experimental parameters. Our data is rescaled and compared with the one parameter epsilon--classical scaling function developed to describe the quantum resonance peaks. Additionally, experimental data is presented for the ``classical'' resonance which occurs in the limit as the kicking period goes to zero. This resonance is found to be analogous to the quantum resonances, and a similar one-parameter classical scaling function is derived, and found to match our experimental results. The width of the quantum and classical resonance peaks is compared, and their Sub-Fourier nature examined.

Sandro Wimberger; Mark Sadgrove; Scott Parkins; Rainer Leonhardt

2005-02-11T23:59:59.000Z

329

Theoretical Study on Rotational Bands and Shape Coexistence of $^{183,185,187}${Tl} in the Particle Triaxial-Rotor Model  

E-Print Network (OSTI)

By taking the particle triaxial-rotor model with variable moment of inertia, we investigate the energy spectra, the deformations and the single particle configurations of the nuclei $^{183,185,187}$Tl systemically. The calculated energy spectra agree with experimental data quite well. The obtained results indicate that the aligned bands observed in $^{183,185,187}$Tl originate from the $[530]{{1/2}}^{-}$, $[532]{{3/2}}^{-}$, $[660]{{1/2}}^{+}$ proton configuration coupled to a prolate deformed core, respectively. Whereas, the negative parity bands built upon the ${{9/2}}^{-}$ isomeric states in $^{183,185,187}$Tl are formed by a proton with the $[505]{{9/2}}^{-}$ configuration coupled to a core with triaxial oblate deformation, and the positive parity band on the ${{13/2}}^{+}$ isomeric state in $^{187}$Tl is generated by a proton with configuration $[606]{{13/2}}^{+}$ coupled to a triaxial oblate core.

Guo-Jie Chen; Yu-xin Liu; Hui-chao Song; Hui Cao

2006-02-11T23:59:59.000Z

330

Turbine blade platform film cooling with simulated stator-rotor purge flow with varied seal width and upstream wake with vortex  

E-Print Network (OSTI)

The turbine blade platform can be protected from hot mainstream gases by injecting cooler air through the gap between stator and rotor. The effectiveness of this film cooling method depends on the geometry of the slot, the quantity of injected air, and the secondary flows near the platform. The purpose of this study was to measure the effect of the upstream vane or stator on this type of platform cooling, as well as the effect of changes in the width of the gap. Film cooling effectiveness distributions were obtained on a turbine blade platform within a linear cascade with upstream slot injection. The width of the slot was varied as well as the mass flow rate of the injected coolant. Obstacles were placed upstream to model the effect of the upstream vane. The coolant was injected through an advanced labyrinth seal to simulate purge flow through a stator-rotor seal. The width of the opening of this seal was varied to simulate the effect of misalignment. Stationary rods were placed upstream of the cascade in four phase locations to model the unsteady wake formed at the trailing edge of the upstream vane. Delta wings were also placed in four positions to create a vortex similar to the passage vortex at the exit of the vane. The film cooling effectiveness distributions were measured using pressure-sensitive paint (PSP). Reducing the width of the slot was found to decrease the area of coolant coverage, although the film cooling effectiveness close to the slot was slightly increased. The unsteady wake was found to have a trivial effect on platform cooling, while the passage vortex from the upstream vane may significantly reduce the film cooling effectiveness.

Blake, Sarah Anne

2007-05-01T23:59:59.000Z

331

Structural health and prognostics management for offshore wind turbines : case studies of rotor fault and blade damage with initial O&M cost modeling.  

SciTech Connect

Operations and maintenance costs for offshore wind plants are significantly higher than the current costs for land-based (onshore) wind plants. One way to reduce these costs would be to implement a structural health and prognostic management (SHPM) system as part of a condition based maintenance paradigm with smart load management and utilize a state-based cost model to assess the economics associated with use of the SHPM system. To facilitate the development of such a system a multi-scale modeling approach developed in prior work is used to identify how the underlying physics of the system are affected by the presence of damage and faults, and how these changes manifest themselves in the operational response of a full turbine. This methodology was used to investigate two case studies: (1) the effects of rotor imbalance due to pitch error (aerodynamic imbalance) and mass imbalance and (2) disbond of the shear web; both on a 5-MW offshore wind turbine in the present report. Based on simulations of damage in the turbine model, the operational measurements that demonstrated the highest sensitivity to the damage/faults were the blade tip accelerations and local pitching moments for both imbalance and shear web disbond. The initial cost model provided a great deal of insight into the estimated savings in operations and maintenance costs due to the implementation of an effective SHPM system. The integration of the health monitoring information and O&M cost versus damage/fault severity information provides the initial steps to identify processes to reduce operations and maintenance costs for an offshore wind farm while increasing turbine availability, revenue, and overall profit.

Myrent, Noah J. [Purdue Center for Systems Integrity, Lafayette, IN; Kusnick, Joshua F. [Purdue Center for Systems Integrity, Lafayette, IN; Barrett, Natalie C. [Purdue Center for Systems Integrity, Lafayette, IN; Adams, Douglas E. [Purdue Center for Systems Integrity, Lafayette, IN; Griffith, Daniel Todd

2013-04-01T23:59:59.000Z

332

Aerodynamic Loads On Rotor Blades.  

E-Print Network (OSTI)

??In the last decade, we have heard more and more about the need of renewable clean energy, but not much has been done. Currently, the… (more)

Abedi, Hamidreza

2011-01-01T23:59:59.000Z

333

Rotor testing in FY 1981  

Science Conference Proceedings (OSTI)

The results and observation are summarized of flywheel spin tests conducted in the Oak Ridge Flywheel Evaluation Laboratory for the Mechanical Energy Storage Technology project at the Lawrence Livermore National Laboratory (LLNL). Two types of tests are discussed. The first is an ultimate speed test similar to those performed in FY 1980. It includes ultimate speed evaluations for a tapered, quasi-isotropic, graphite composite flywheel built by LLNL, a constant thickness disk with an SMC core and circumferentially wound graphite restraining ring built by Owens-Corning Fiberglas and Lord Kinematic Corporation, and a constant thickness disk with an S-glass, ..cap alpha..-ply layup core and circumferentially wound graphite ring built by General Electric. The second type of test is a cyclic fatigue test. A matching General Electric flywheel was used as the first test unit. Test results as well as general observations and conclusions are presented.

Steele, R.S. Jr.; Babelay, E.F. Jr.

1981-07-13T23:59:59.000Z

334

SUBSTANTIALLY PARALLEL FLUX UNCLUTTERED ROTOR MACHINES ...  

The system can be used either as a motor or a generator: Inventors: Hsu, John S. (Oak Ridge, TN) Application Number: 12/ 466,169: Filed: May 14, 2009: Government ...

335

Methods of making wind turbine rotor blades  

DOE Patents (OSTI)

A method of manufacturing a root portion of a wind turbine blade includes, in an exemplary embodiment, providing an outer layer of reinforcing fibers including at least two woven mats of reinforcing fibers, providing an inner layer of reinforcing fibers including at least two woven mats of reinforcing fibers, and positioning at least two bands of reinforcing fibers between the inner and outer layers, with each band of reinforcing fibers including at least two woven mats of reinforcing fibers. The method further includes positioning a mat of randomly arranged reinforcing fibers between each pair of adjacent bands of reinforcing fibers, introducing a polymeric resin into the root potion of the wind turbine blade, infusing the resin through the outer layer, the inner layer, each band of reinforcing fibers, and each mat of random reinforcing fibers, and curing the resin to form the root portion of the wind turbine blade.

Livingston, Jamie T. (Pensacola, FL); Burke, Arthur H. E. (Gulf Breeze, FL); Bakhuis, Jan Willem (Nijverdal, NL); Van Breugel, Sjef (Enschede, NL); Billen, Andrew (Daarlerveen, NL)

2008-04-01T23:59:59.000Z

336

Optimum rotationally symmetric shells for flywheel rotors  

DOE Patents (OSTI)

A flywheel rim support formed from two shell halves. Each of the shell halves has a disc connected to the central shaft. A first shell element connects to the disc at an interface. A second shell element connects to the first shell element. The second shell element has a plurality of meridional slits. A cylindrical shell element connects to the second shell element. The cylindrical shell element connects to the inner surface of the flywheel rim. A flywheel rim support having a disc connected an outer diameter of a shaft. Two optimally shaped shell elements connect to the optimally shaped disc at an interface. The interface defines a discontinuity in a meridional slope of said support. A cylindrical shell element connects to the two shell elements. The cylindrical shell element has an outer surface for connecting to the inner surface of the flywheel rim. A flywheel rim casing includes an annular shell connected to the central shaft. The annular shell connects to the flywheel rim. A composite shell surrounds the shaft, annular shell and flywheel rim.

Blake, Henry W. (Oak Ridge, TN)

2000-01-01T23:59:59.000Z

337

Public Rotor Topical Report.PDF  

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

the thrust from a ramjet thrust module into shaft torque, which in turn can drive a generator to provide electricity of shaft power for a mechanical drive application. This...

338

Guide to Optimized Nuclear Low-Pressure Turbine Rotor Inspection  

Science Conference Proceedings (OSTI)

In the past few years, the nuclear utility industry has reduced down-time for refueling outages to trim costs and improve overall unit performance. Consequently, this has also reduced the time available for other routine outage work and has often placed turbine maintenance and inspection tasks on the critical path. This report provides a review of the strategies several nuclear utilities have employed at their plants to reduce the time required to perform low-pressure turbine inspections. Included is a r...

1997-12-23T23:59:59.000Z

339

Single Molecular Rotor at the Nanoscale Christian Joachim1  

E-Print Network (OSTI)

of miniaturization of another type of machine: mechanical machines able to create motion, produce work, pump heat, or perform other useful functions. To generate motion, a machine has to consist of moving parts and requires potential pro®le of the moving parts relative to the static ones [7]. In layman's terms, biological machines

Gimzewski, James

340

Full-scale wind turbine rotor aerodynamics research  

DOE Green Energy (OSTI)

The United States Department of Energy and the National Renewable Energy Laboratory (NREL) are conducting research to improve wind turbine technology at the NREL National Wind Technology Center (NWTC). One program, the Combined Experiment, has focused on making measurements needed to understand aerodynamic and structural responses of horizontal-axis wind turbines (HAWT). A new phase of this program, the Unsteady Aerodynamics Experiment, will focus on quantifying unsteady aerodynamic phenomena prevalent in stall-controlled HAWTs. Optimally twisted blades and innovative instrumentation and data acquisition systems will be used in these tests. Data can now be acquired and viewed interactively during turbine operations. This paper describes the NREL Unsteady Aerodynamics Experiment and highlights planned future research activities.

Simms, D A; Butterfield, C P

1994-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

A Design Study of Single-Rotor Turbomachinery Cycles.  

E-Print Network (OSTI)

??Gas turbine engines provide thrust for aircraft engines and supply shaft power for various applications. They consist of three main components. That is, a compressor… (more)

Thiagarajan, Manoharan

2004-01-01T23:59:59.000Z

342

Utilization of rotor kinetic energy storage for hybrid ...  

Flywheel Energy Storage Device for Hybrid and Electric Vehicles: Abstract: A power system for a motor vehicle having an internal combustion engine, ...

343

Numerical simulation of tower rotor interaction for downwind wind turbine  

Science Conference Proceedings (OSTI)

Downwind wind turbines have lower upwind rotormisalignment, and thus lower turning moment and self-steered advantage over the upwind configuration. In this paper, numerical simulation to the downwind turbine is conducted to investigate the interaction ...

Isam Janajreh; Ilham Talab; Jill Macpherson

2010-01-01T23:59:59.000Z

344

Simulations of observed lee-waves and rotor turbulence  

Science Conference Proceedings (OSTI)

On 18 November 2008 a commercial aircraft encountered severe turbulence while flying in westerly flow along the southeastern coast of Iceland and descending from 2.500 m down to the ground for a safe landing. Numerical simulations at horizontal ...

Hálfdán Ágústsson; Haraldur Ólafsson

345

Methods and apparatus for reduction of asymmetric rotor loads in ...  

A method for reducing load and providing yaw alignment in a wind turbine includes measuring displacements or moments resulting from asymmetric loads on the wind turbine.

346

Turbine rotor-stator leaf seal and related method  

DOE Patents (OSTI)

A seal assembly for installation between rotating and stationary components of a machine includes a first plurality of leaf spring segments secured to the stationary component in a circumferential array surrounding the rotating component, the leaf spring segments each having a radial mounting portion and a substantially axial sealing portion, the plurality of leaf spring segments shingled in a circumferential direction.

Herron, William Lee (Cincinnati, OH); Butkiewicz, Jeffrey John (Simpsonville, SC)

2003-01-01T23:59:59.000Z

347

Connector tube for a turbine rotor cooling circuit  

DOE Patents (OSTI)

A tubular connector adapted to extend between two tubular components comprising a tubular body having an internal diameter, a first free end including an annular radial flange having a tapered surface adapted to engage a complementary seating surface on a first of the two tubular components, the internal diameter remaining constant through the first free end; and a second free end having an annular bulbous shape adapted to seat within a cylindrical end of a second of the two tubular components.

Li, Ming Cheng (Cincinnati, OH)

2003-06-24T23:59:59.000Z

348

Bore tube assembly for steam cooling a turbine rotor  

SciTech Connect

An axial bore tube assembly for a turbine is provided to supply cooling steam to hot gas components of the turbine wheels and return the spent cooling steam. A pair of inner and outer tubes define a steam supply passage concentric about an inner return passage. The forward ends of the tubes communicate with an end cap assembly having sets of peripheral holes communicating with first and second sets of radial tubes whereby cooling steam from the concentric passage is supplied through the end cap holes to radial tubes for cooling the buckets and return steam from the buckets is provided through the second set of radial tubes through a second set of openings of the end cap into the coaxial return passage. A radial-to-axial flow transitioning device, including anti-swirling vanes is provided in the end cap. A strut ring adjacent the aft end of the bore tube assembly permits axial and radial thermal expansion of the inner tube relative to the outer tube.

DeStefano, Thomas Daniel (Ballston Lake, NY); Wilson, Ian David (Clifton Park, NY)

2002-01-01T23:59:59.000Z

349

Modification of Alloy 706 for High Temperature Steam Turbine Rotor ...  

Science Conference Proceedings (OSTI)

Alloy706 is a gas-turbine disk material. However, since Alloy706 suffers from a solidification defect (freckle defect) due to segregation of Nb, it is difficult to make  ...

350

Substantially Parallel Flux Uncluttered Rotor Machines (U-Machine ...  

Vehicles and Fuels Industrial Technologies Hydropower ... Auto manufacturers; Industrial motor/generator manufacturers; Patents and Patent Applications. ID Number.

351

Analysis of wound rotor self-excited induction generators  

Science Conference Proceedings (OSTI)

Self-excited induction generators are found to be to be most suitable machines for wind energy conversion in remote and windy areas due to several advantages over grid connected machines. Such machine exhibits poor performance in terms of voltage and ... Keywords: induction generator, renewable generation, self-excited induction generator, steady state analysis (SSA), wind energy generation

K. S. Sandhu; S. P. Jain

2008-01-01T23:59:59.000Z

352

Connector tube for a turbine rotor cooling circuit  

DOE Patents (OSTI)

A tubular connector adapted to extend between two tubular components comprising a tubular body having an internal diameter, a first free end including an annular radial flange having a tapered surface adapted to engage a complementary seating surface on a first of the two tubular components, the internal diameter remaining constant through the first free end; and a second free end having an annular bulbous shape adapted to seat within a cylindrical end of a second of the two tubular components.

Li, Ming Cheng (Cincinnati, OH)

2002-01-01T23:59:59.000Z

353

Wind Turbine/Generator Set and Method of Making Same - Energy ...  

A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor ...

354

Wind turbine having a direct-drive drivetrain - Energy Innovation ...  

A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor ...

355

New Technologies | Y-12 National Security Complex  

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

turnstiles. The higher the speed, the more force is generated by ARCS on the rotor to slow the operator. At a preset normal entry speed, the operator can pass through...

356

Evaluation of Demo 1C composite flywheel rotor burst test and containment design  

DOE Green Energy (OSTI)

Laboratory-Directed funds were provided in FY 1995 for research to develop flywheel containment specifications and to consider concepts that could satisfy these specifications and produce a prototype small, lightweight, inexpensive, mobile flywheel containment. Research activities have included an analytical and pictorial review of the Demo 1C flywheel failure test, which provided significant insight about radial and axial failure modes; calculations of the thickness of ultra-conservative pressure vessel containment; entertainment of advanced containment concepts using lightweight materials and armor literature; consideration of fabrication assembly procedures; and participation in a Flywheel Energy Storage Workshop during which additional flywheel failure experiences were discussed. Based on these activities, calculations, and results, a list of conclusions concerning flywheel containment and its relation to the flywheel are presented followed by recommendations for further research.

Kass, M.D.; McKeever, J.W.; Akerman, M.A.; Goranson, P.L.; Litherland, P.S.; O`Kain, D.U.

1998-07-01T23:59:59.000Z

357

A tilt rotor UAV for long endurance operations in remote environments  

E-Print Network (OSTI)

Extended mission times will greatly expand the utility of small UAVs that are currently limited to a single flight lasting no more than a few hours. This thesis assesses the challenges to developing a small, long endurance ...

VanderMey, Josiah T

2011-01-01T23:59:59.000Z

358

Vibration characterization of an active magnetic bearing supported rotor / J. Bean.  

E-Print Network (OSTI)

??The McTronX Research group at the Potchefstroom campus of the North-West University, aims to establish a knowledge base on active magnetic bearing (AMB) systems. Up… (more)

Bean, Jaco

2011-01-01T23:59:59.000Z

359

Computation of the National Renewable Energy Laboratory Phase-VI Rotor in Pitch Motion during Standstill  

Science Conference Proceedings (OSTI)

Previously, computational fluid dynamics (CFD) computations of dynamic stall on wind turbine blades have been performed for stand still conditions with moderate success by among others the present authors. In the present work, numerical investigations are performed to illustrate the possibilities of state of the art CFD methods for this problem, including the numerical requirements as time-step and grid resolution. Additionally, the effect of different types of modeling is investigated, ranging from fully turbulent Reynolds-averaged Navier-Stokes (RANS), transitional RANS, to transitional delayed detached-eddy simulation computations. The investigation indicates that detailed information and fair agreement with measurements can be obtained.

Sorensen, N. N.; Schreck, S.

2012-04-01T23:59:59.000Z

360

Brake rotor design and comparison using finite element analysis : an investigation in topology optimization.  

E-Print Network (OSTI)

??Disc brake technology used for mountain bikes, and mountain bike technology in general, has improved significantly as the sport of mountain biking has evolved. Disc… (more)

Domond, Kenneth

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Design of a Ferrite Permanent Magnet Rotor for a Wind Power Generator.  

E-Print Network (OSTI)

?? Due to the insecurity of the supply of raw materials needed for neodymium-iron-boron magnets, typically used in permanent magnet generators, the use of ferrite… (more)

Eklund, Petter

2013-01-01T23:59:59.000Z

362

Rotor Scale Model Tests for Power Conversion Unit of GT-MHR (A26845)  

E-Print Network (OSTI)

Proc. Of 5th International Conf. On High Temperatore Reactor Technology, Prague, Czech Republic, 2010; General Atomics Report GA-A26845 (2010)5th International Conference on High Temperature Reactor Technology Prague, CZ, 2010999619072

Baxi, C.B.

2010-08-18T23:59:59.000Z

363

Numerical simulation and prediction of loads in marine current turbine full-scale rotor blades.  

E-Print Network (OSTI)

??Marine current turbines are submerged structures and subjected to loading conditions from both the currents and wave effects. The associated phenomena posed significant challenge to… (more)

Senat, Junior.

2011-01-01T23:59:59.000Z

364

Development, validation and verification of the Momentum Source Model for discrete rotor blades.  

E-Print Network (OSTI)

??In this research, a novel numerical technique for modeling the unsteady aerodynamics of rotorcraft flows has been developed. The aim of this research is to… (more)

Guntupalli, Kanchan

2011-01-01T23:59:59.000Z

365

Multi-piece wind turbine rotor blades and wind turbines incorporating same  

DOE Patents (OSTI)

A multisection blade for a wind turbine includes a hub extender having a pitch bearing at one end, a skirt or fairing having a hole therethrough and configured to mount over the hub extender, and an outboard section configured to couple to the pitch bearing.

Moroz; Emilian Mieczyslaw (San Diego, CA)

2008-06-03T23:59:59.000Z

366

Performance of a Wind-Profiling Lidar in the Region of Wind Turbine Rotor Disks  

Science Conference Proceedings (OSTI)

As the wind energy sector continues to grow, so does the need for reliable vertical wind profiles in the assessment of wind resources and turbine performance. In situ instrumentation mounted on meteorological towers can rarely probe the atmosphere ...

Matthew L. Aitken; Michael E. Rhodes; Julie K. Lundquist

2012-03-01T23:59:59.000Z

367

Development of turbo?viscous pump with ceramic rotor assembly and oil?free driving unit  

Science Conference Proceedings (OSTI)

In order to establish a dynamic pumping system for fusion reactors and other advanced vacuum devices

Y. Murakami; T. Abe; H. Ohsawa; S. Hata

1991-01-01T23:59:59.000Z

368

Performance of Rotors in a Brushless Doubly-Fed Induction Machine (BDFM)  

E-Print Network (OSTI)

and the output frequency of the inverter. In common with the currently used double-fed induction generator (DFIG the construction of a machine with a rating similar to that of existing DFIGs, see Figure 1. The authors' BDFM uses

Cambridge, University of

369

Development of an LP Rotor Rim-Attachment Cracking Life Assessment Code (LPRimLife)  

Science Conference Proceedings (OSTI)

Most of the domestic turbine fleet has reached the 50,000-hour range of service operation. Unfortunately, above this level of operational hours, a number of turbines have begun to experience low-pressure (LP) rim-attachment cracking. A computer code developed by EPRI, LPRimLife, provides utilities with a methodology for assessing the remaining life of LP rim attachments with known or suspected cracking.

1999-12-07T23:59:59.000Z

370

Rotor dynamic analysis of 3D-modeled gas turbinerotor in Ansys.  

E-Print Network (OSTI)

?? The world we are living in today is pushing the technology harder and harder. The products need to get better and today they also… (more)

Samuelsson, Joakim

2009-01-01T23:59:59.000Z

371

Modélisation du comportement dynamique couplé rotor-stator d'une turbine en situation accidentelle.  

E-Print Network (OSTI)

??Pour les groupes turbo-alternateurs du parc nucléaire français, la situation accidentelle de référence lors du dimensionnement est définie par le départ d'une ailette terminale des… (more)

Roques, Sébastien

2007-01-01T23:59:59.000Z

372

APPENDIX A. Description of the rotor program, iar95.exe. The ...  

Science Conference Proceedings (OSTI)

... Tests have been done by direct comparison with output ... and 'blz_iar_axissw' for actual test runs and ... the TM components and not the :compone nts. ...

2011-10-03T23:59:59.000Z

373

Evaluation of the National Throughput Benefits of the Civil Tilt Rotor  

Science Conference Proceedings (OSTI)

This study examines the capacity and throughput effects of implementing the Civil Tiltrotor Aircraft on a national scale. The CTR has the unique operating characteristic of being able to take off and land like a rotorcraft (VTOL capability) but cruises ...

Johnson Jesse; Stouffer Virginia; Long Dou; Gribko Joana

2001-09-01T23:59:59.000Z

374

Turning Waste Heat into Power: Ener-G-Rotors and the Entrepreneurial...  

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

(below 400 degrees F) into electricity. The waste heat stream is diverted through a "hot heat exchanger" inside the system. A cooling stream is simultaneously diverted through the...

375

American Institute of Aeronautics and Astronautics Wave Rotor Research Program at Michigan State University  

E-Print Network (OSTI)

turbines, and water refrigeration systems. In collaboration with the research team at Warsaw University, and other design and analysis tools are discussed. I. Introduction here is a continual demand to increase, propulsion, refrigeration, and car engine supercharging. References 4-7 have comprehensively reviewed

Müller, Norbert

376

Inlet swirl distortion effects on the generation and propagation of fan rotor shock noise  

E-Print Network (OSTI)

A body-force-based fan model for the prediction of multiple-pure-tone noise generation is developed in this thesis. The model eliminates the need for a full-wheel, three-dimensional unsteady RANS simulation of the fan blade ...

Defoe, Jeff (Jeffrey James)

2011-01-01T23:59:59.000Z

377

DUCTED FAN INLET/EXIT AND ROTOR TIP FLOWIMPROVEMENTS FOR VERTICAL LIFT SYSTEMS.  

E-Print Network (OSTI)

??Ducted fan based vertical lift systems are excellent candidates to be in the group of the next generation vertical lift vehicles, with many potential applications… (more)

Akturk, Ali

2010-01-01T23:59:59.000Z

378

Morphology in P/M Rotor Disc Alloys During Heat Treatment  

Science Conference Proceedings (OSTI)

... ?? in this set of alloys. Following the supersolvus heat treatment, the effect of ageing ... fraction, combined with increased levels of refractory elements, have led to ...... power pant and renewables - 6th International Charles. Parsons Turbine ...

379

Development of a reconfigurable protective system for multi-rotor UAS  

Science Conference Proceedings (OSTI)

The purpose of this study is to illustrate how the design and deployment of a minimal protective system for multi-rotorcraft can cater for changes in legislation and provide for greater use both in and outdoors. A methodology is presented to evaluate ... Keywords: autonomous system, landing gear, reconfigurable system, unmanned aerial vehicles

Thomas Irps; Stephen Prior; Darren Lewis

2011-07-01T23:59:59.000Z

380

COE Reductions through Active Aerodynamic Control of Rotor Aerodynamics and Geometry  

Science Conference Proceedings (OSTI)

This study investigates potential cost of energy reductions that might be achieved by designing active systems to mitigate loads throughout the wind turbine system.

Griffin, D. A.; McCoy, T. J.

2008-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Understanding Wind Turbine Price Trends in the U.S. Over the Past Decade  

E-Print Network (OSTI)

that the average turbine’s rotor swept area has increasedthe average turbine hub height and rotor diameter also4. Average Turbine Capacity, Hub Height, and Rotor Diameter

Bolinger, Mark

2013-01-01T23:59:59.000Z

382

Reassessing Wind Potential Estimates for India: Economic and Policy Implications  

E-Print Network (OSTI)

analysis. Further, turbines with higher rotor diameter havethe wind turbine, the average hub-height and rotor diameterand larger rotor diameters allows wind turbines to sweep

Phadke, Amol

2012-01-01T23:59:59.000Z

383

A multi-scale approach to statistical and model-based structural health monitoring with application to embedded sensing for wind energy  

E-Print Network (OSTI)

in a composite wind turbine rotor blade," Structural Healthmonitoring of wind turbine rotor blades," in progress 2013.in a composite wind turbine rotor blade." The dissertation

Taylor, Stuart Glynn

2013-01-01T23:59:59.000Z

384

Part of the Climate Change Problem . . . and the Solution? Chinese-Made Wind Power Technology and Opportunities for Dissemination  

E-Print Network (OSTI)

turbines, including technologies for variable pitch rotors turbines, including  technologies for  variable pitch rotors turbine  components  that  are  particularly  labor  intensive.   Rotor 

Lewis, Joanna I.

2005-01-01T23:59:59.000Z

385

Understanding Trends in Wind Turbine Prices Over the Past Decade  

E-Print Network (OSTI)

that the average turbine’s rotor swept area has increasedthe average turbine hub height and rotor diameter also6. Average Turbine Capacity, Hub Height, and Rotor Diameter

Bolinger, Mark

2012-01-01T23:59:59.000Z

386

Analysis of a flapping foil system for energy harvesting at low Reynolds number  

E-Print Network (OSTI)

the horizontal axis rotor turbines and energy crisis in theperformance convectional rotor blade turbines. To get higheror hydro-turbines. Most of all, having less noise than rotor

Cho, Hunkee

2011-01-01T23:59:59.000Z

387

NCNR Laboratory E131  

Science Conference Proceedings (OSTI)

... Rotor: Capacity: 4-place rotor for 15ml and 50ml Centrifuge tubes 2-place (4 place rotor) for Titanium Cells- SANS. ... Gas Purification System: ...

388

Dynamic Simulation Studies of the Frequency Response of the Three U.S. Interconnections with Increased Wind Generation  

E-Print Network (OSTI)

factor. Type 2 Wind Turbine Generator (Wound Rotor InductionTurbine Generator (Doubly-fed Induction (Asynchronous) Generator: The rotor

Mackin, Peter

2011-01-01T23:59:59.000Z

389

Development of Fiber Bragg Grating Strain, Thermal, and Magnetic Sensors for Smart Structure Applications  

E-Print Network (OSTI)

operational load in a wind turbine rotor blade,” Measurementwere observed in the wind turbine rotor blade. Takeda et al.

Emmons, Michael

2012-01-01T23:59:59.000Z

390

Dynamic multistation photometer  

DOE Patents (OSTI)

A portable fast analyzer is provided that uses a magnetic clutch/brake to rapidly accelerate the analyzer rotor, and employs a microprocessor for automatic analyzer operation. The rotor is held stationary while the drive motor is run up to speed. When it is desired to mix the sample(s) and reagent(s), the brake is deenergized and the clutch is energized wherein the rotor is very rapidly accelerated to the running speed. The parallel path rotor that is used allows the samples and reagents to be mixed the moment they are spun out into the rotor cuvetes and data acquisition begins immediately. The analyzer will thus have special utility for fast reactions.

Bauer, Martin L. (Oak Ridge, TN); Johnson, Wayne F. (Loudon, TN); Lakomy, Dale G. (Knoxville, TN)

1977-01-01T23:59:59.000Z

391

Steady state and transient measurements within a compressor rotor during steam-induced stall at transonic operational speeds .  

E-Print Network (OSTI)

??Steam leakage from an aircraft carrier catapult is sometimes ingested into the aircraft engines upon launch which may induce compressor stall. Investigation of this phenomenon… (more)

Zarro, Sarah E.

2006-01-01T23:59:59.000Z

392

Investigation of Upstream Boundary Layer Influence on Mountain Wave Breaking and Lee Wave Rotors Using a Large-Eddy Simulation  

Science Conference Proceedings (OSTI)

Interactions between a turbulent boundary layer and nonlinear mountain waves are explored using a large-eddy simulation model. Simulations of a self-induced critical layer, which develop a stagnation layer and a strong leeside surface jet, are ...

Craig M. Smith; Eric D. Skyllingstad

2009-10-01T23:59:59.000Z

393

Results of the ROTOR-program. II. The long-term photometric variability of weak-line T Tauri stars  

E-Print Network (OSTI)

T Tauri stars exhibit variability on all timescales, whose origin is still debated. On WTTS the variability is fairly simple and attributed to long-lived, ubiquitous cool spots. We investigate the long term variability of WTTS, extending up to 20 years in some cases, characterize it statistically and discuss its implications for our understanding of these stars. We have obtained a unique, homogeneous database of photometric measurements for WTTS extending up to 20 years. It contains more than 9 000 UBV R observations of 48 WTTS. All the data were collected at Mount Maidanak Observatory (Uzbekistan) and they constitute the longest homogeneous record of accurate WTTS photometry ever assembled. Definitive rotation periods for 35 of the 48 stars are obtained. Phased light curves over 5 to 20 seasons are now available for analysis. Light curve shapes, amplitudes and colour variations are obtained for this sample and various behaviors exhibited, discussed and interpreted. Our main conclusion is that most WTTS have very stable long term variability with relatively small changes of amplitude or mean light level. The long term variability seen reflects modulation in the cold spot distributions. Photometric periods are stable over many years, and the phase of minimum light can be stable as well for several years. On the long term, spot properties do change in subtle ways, leading to secular variations in the shape and amplitudes of the light curves.

K. N. Grankin; J. Bouvier; W. Herbst; S. Yu. Melnikov

2008-01-23T23:59:59.000Z

394

Detection of Rotor and Load Faults in BLDC Motors Operating Under Stationary and Non-Stationary Conditions .  

E-Print Network (OSTI)

??Brushless Direct Current (BLDC) motors are one of the motor types rapidly gaining popularity. BLDC motors are being increasingly used in critical high performance industries… (more)

Rajagopalan, Satish

2006-01-01T23:59:59.000Z

395

Low Wind Speed Technology Phase II: Reducing Cost of Energy Through Rotor Aerodynamics Control; Global Energy Concepts, LLC  

DOE Green Energy (OSTI)

This fact sheet describes a subcontract with Global Energy Concepts to evaluate a wide range of wind turbine configurations and their impact on overall cost of energy (COE).

Not Available

2006-03-01T23:59:59.000Z

396

Isobaric Height Perturbations Associated with Mountain Waves Measured by Aircraft during the Terrain-Induced Rotor Experiment  

Science Conference Proceedings (OSTI)

It has only been in the last few years that accurate measurement of the horizontal pressure gradient has been possible over complex terrain using an airborne platform. To infer forcing mechanisms for the wind, an independent measure of the height ...

Thomas R. Parish; Larry D. Oolman

2012-12-01T23:59:59.000Z

397

Dynamical response of the "GGG" rotor to test the Equivalence Principle: theory, simulation and experiment. Part I: the normal modes  

E-Print Network (OSTI)

Recent theoretical work suggests that violation of the Equivalence Principle might be revealed in a measurement of the fractional differential acceleration $\\eta$ between two test bodies -of different composition, falling in the gravitational field of a source mass- if the measurement is made to the level of $\\eta\\simeq 10^{-13}$ or better. This being within the reach of ground based experiments, gives them a new impetus. However, while slowly rotating torsion balances in ground laboratories are close to reaching this level, only an experiment performed in low orbit around the Earth is likely to provide a much better accuracy. We report on the progress made with the "Galileo Galilei on the Ground" (GGG) experiment, which aims to compete with torsion balances using an instrument design also capable of being converted into a much higher sensitivity space test. In the present and following paper (Part I and Part II), we demonstrate that the dynamical response of the GGG differential accelerometer set into supercritical rotation -in particular its normal modes (Part I) and rejection of common mode effects (Part II)- can be predicted by means of a simple but effective model that embodies all the relevant physics. Analytical solutions are obtained under special limits, which provide the theoretical understanding. A simulation environment is set up, obtaining quantitative agreement with the available experimental data on the frequencies of the normal modes, and on the whirling behavior. This is a needed and reliable tool for controlling and separating perturbative effects from the expected signal, as well as for planning the optimization of the apparatus.

G. L. Comandi; M. L. Chiofalo; R. Toncelli; D. Bramanti; E. Polacco; A. M. Nobili

2006-01-18T23:59:59.000Z

398

Control strategies of doubly fed induction generator-based wind turbine system with new rotor current protection topology  

Science Conference Proceedings (OSTI)

A protection scheme of a doubly fed induction generator (DFIG) based wind turbine system during faults is crowbar activation. With this protection

Jackson John Justo; Kyoung-Soo Ro

2012-01-01T23:59:59.000Z

399

Influence of Rotor Structure and Number of Phases on Torque and Flux Weakening Characteristics of V-shape Interior PM  

E-Print Network (OSTI)

on torque and Flux weakening region of V-shape IPM machine from TOYOTA PRIUS type, more specifically number on the machine characteristics, PRIUS structure is transformed into 5-phase machine of the same which have the same type and dimensions of TOYOTA PRIUS machine [6], but they differ in the phase number

Paris-Sud XI, Université de

400

Rotational Augmentation on a 2.3 MW Rotor Blade with Thick Flatback Airfoil Cross-Sections: Preprint  

DOE Green Energy (OSTI)

Rotational augmentation was analyzed for a 2.3 MW wind turbine, which was equipped with thick flatback airfoils at inboard radial locations and extensively instrumented for acquisition of time varying surface pressures. Mean aerodynamic force and surface pressure data were extracted from an extensive field test database, subject to stringent criteria for wind inflow and turbine operating conditions. Analyses of these data showed pronounced amplification of aerodynamic forces and significant enhancements to surface pressures in response to rotational influences, relative to two-dimensional, stationary conditions. Rotational augmentation occurrence and intensity in the current effort was found to be consistent with that observed in previous research. Notably, elevated airfoil thickness and flatback design did not impede rotational augmentation.

Schreck, S.; Fingersh, L.; Siegel, K.; Singh, M.; Medina, P.

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Electrostatic generator/motor having rotors of varying thickness and a central stator electrically connected together into two groups  

DOE Patents (OSTI)

A sub-module consists of a set of two outer sets of stationary fan-blade-shaped sectors. These outer sectors include conductive material and are maintained at ground potential in several examples. Located midway between them is a set of stationary sector plates with each plate being electrically insulated from the others. An example provides that the inner sector plates are connected together alternately, forming two groups of parallel-connected condensers that are then separately connected, through high charging circuit resistances, to a source of DC potential with respect to ground, with an additional connecting lead being provided for each group to connect their output as an AC output to a load. These same leads can he used, when connected to a driver circuit, to produce motor action.

Post, Richard F. (Walnut Creek, CA)

2010-11-16T23:59:59.000Z

402

Optimization of a Savonius rotor vertical-axis wind turbine for use in water pumping systems in rural Honduras  

E-Print Network (OSTI)

The D-lab Honduras team designed and constructed a wind-powered water pump in rural Honduras during IAP 2007. Currently, the system does not work under its own power and water must be pumped by hand. This thesis seeks to ...

Zingman, Aron (Aron Olesen)

2007-01-01T23:59:59.000Z

403

An experimental study of heat transfer in the rectangular coolant passages of a gas turbine rotor blade.  

E-Print Network (OSTI)

??Modern gas turbines have high inlet temperatures to harness maximum power output, which causes different components to experience severe thermal stresses and fatigue. To achieve… (more)

Uddin, Mohammed Jalal

2012-01-01T23:59:59.000Z

404

Design guide for composite-material flywheels: rotor dyamic considerations. Part I. System whirling and stability. Final report  

DOE Green Energy (OSTI)

Information to designers of flywheels is provided which will enable them to predict many aspects of the dynamic behavior of their flywheel systems when spin-tested with a quill-shaft support and driven by an air turbine. Computer programs are presented for the following dynamic analysis to obtain the results indicated: free whirling for natural frequencies versus rotational speed and the associated mode shapes; rough-type stability analysis for determining the stability limits; and forced whirling analysis for estimating the response of major components of the system to flywheel mass eccentricity and initial tilt. For the first and third kinds of analyses, two different mathematical models of the generic system are investigated. One is a seven-degree-of-freedom lumped-parameter analysis, while the other is a combined distributed- and lumped-parameter analysis. When applied to an existing flywheel system, the two models yielded numerical values for the lowest first-order forward critical speed in very close agreement with each other and with experimental results obtained in spin tests. Therefore, for the second kind of analysis, only the lumped-parameter model is implemented. Qualitative discussions as to why forced retrograde whirling is not as severe as forward whirling are also presented. The analyses are applied to the multi-material ring type flywheel systems, a constant-thickness-diskring type, and a tapered-thickness-disk type. In addition, the effects of the following flywheel design parameters on system dynamics were investigated: flywheel mass; diametral and polar mass moments of inertia; location of mass center from the lower end of the quill shaft; quill shaft length; lower turbine-bearing support stiffness; equivalent viscous damping coefficient of the external damper; flywheel dead weight; and torque applied at the turbine.

Bert, C.W.; Ramunujam, G.

1981-09-01T23:59:59.000Z

405

Induction machine  

DOE Patents (OSTI)

A polyphase rotary induction machine for use as a motor or generator utilizing a single rotor assembly having two series connected sets of rotor windings, a first stator winding disposed around the first rotor winding and means for controlling the current induced in one set of the rotor windings compared to the current induced in the other set of the rotor windings. The rotor windings may be wound rotor windings or squirrel cage windings.

Owen, Whitney H. (Ogden, UT)

1980-01-01T23:59:59.000Z

406

2011 Wind Technologies Market Report  

E-Print Network (OSTI)

Information on turbine hub heights and rotor diameters wereStates; wind turbine size, hub height, and rotor diameter;of turbine size, including hub height and rotor diameter (

Bolinger, Mark

2013-01-01T23:59:59.000Z

407

2009 Wind Technologies Market Report  

E-Print Network (OSTI)

in average turbine hub height and rotor diameter have beenInformation on turbine hub heights and rotor diameters werehub height and rotor diameter of wind turbines installed in

Wiser, Ryan

2010-01-01T23:59:59.000Z

408

2010 Wind Technologies Market Report  

E-Print Network (OSTI)

in average turbine hub height and rotor diameter have beenInformation on turbine hub heights and rotor diameters wereStates; wind turbine size, hub height, and rotor diameter;

Wiser, Ryan

2012-01-01T23:59:59.000Z

409

An experimental and numerical study of wind turbine seismic behavior  

E-Print Network (OSTI)

of Turbine Rotor . . . . . . . . . . . . . . 3.9 Results ofA. C. (2006). “WindPACT turbine rotor design study. ” ReportA. C. (2006). “WindPACT turbine rotor design study. ” Report

Prowell, I.

2011-01-01T23:59:59.000Z

410

WREF 2012: THE PAST AND FUTURE COST OF WIND ENERGY  

E-Print Network (OSTI)

A.C. (2006). WindPACT Turbine Rotor Design Study. NREL/SR-growth of turbine nameplate capacity, hub height, and rotorLarger  rotors  with  reduced  turbine  loads  allowed  

Wiser, Ryan

2013-01-01T23:59:59.000Z

411

Theory and Performance of Tesla Turbines  

E-Print Network (OSTI)

camera. Bottom: tested turbine rotor housing diameter isfound in Figure 1.1. The turbine rotor consists of severalpower was reached. The turbine rotor and nozzle can be seen

Romanin, Vincent D.

2012-01-01T23:59:59.000Z

412

ANALYSIS OF THE PERFORMANCE AND COST EFFECTIVENESS OF NINE SMALL WIND ENERGY CONVERSION SYSTEMS FUNDED BY THE DOE SMALL GRANTS PROGRAM  

E-Print Network (OSTI)

been installed, and the turbine rotor, blades, associatedfrom Pa. 355-ft. dia. rotor, turbine, 64-ft. tower, towerThe turbine has 4 coupled to an blades with a rotor diameter

Kay, J.

2009-01-01T23:59:59.000Z

413

Large-eddy Simulation of the Nighttime Stable Atmospheric Boundary Layer  

E-Print Network (OSTI)

responses in the turbine rotor as well as the supportingthe rotor sweep area of the generic wind turbine between 40turbine micro-siting, obtain reliable estimates of wind resources, and prevent rotor

Zhou, Bowen

2012-01-01T23:59:59.000Z

414

Dynamic analysis of a 5 megawatt offshore floating wind turbine  

E-Print Network (OSTI)

of wind turbine. Rating Control Rotor Radius Rated Windturbines is a major design consideration due to cyclic loading induced by the rotating rotors [the turbine. The base was assumed to be fixed and the rotor

Harriger, Evan Michael

2011-01-01T23:59:59.000Z

415

Value Capture in the Global Wind Energy Industry  

E-Print Network (OSTI)

of large wind turbine (REpower MM92) Tower Rotor blades GearLiberty turbine, 2008 Component Tower Rotor blades/hub/turbine, 2008 Component Supplier Supplier HQ Tower Gamesa Spain Rotor

Dedrick, Jason; Kraemer, Kenneth L.

2011-01-01T23:59:59.000Z

416

APPLICATION OF TURBOMACHINERY IN SOLAR-ASSISTED RANKINE COOLING SYSTEMS  

E-Print Network (OSTI)

be less than the turbine rotor diameter, and staggereddirected against the same turbine rotor a number of times,enters a plenum in the turbine rotor. Nozzles spaced around

Leech, J.

2010-01-01T23:59:59.000Z

417

Southern California Channel Islands Bibliography, through 1992  

E-Print Network (OSTI)

of rotary-separator-turbine rotor materials. The materials,by a fixed pitch wind turbine rotor. The present state-of-Power/Turbines/Wind turbine rotors/wind power/Renewable

Channel Islands National Marine Sanctuary

1992-01-01T23:59:59.000Z

418

DIRECT CONTACT HEAT EXCHANGER 10 kW POWER LOOP. SECTION 1: EXECUTIVE SUMMARY. SECTION 2: TEST SERIES NO. 1. SECTION 3; TEST SERIES NO. 2  

E-Print Network (OSTI)

deposits to occur in the turbine rotor and nozzles reducingdesign parameters for the turbine rotor and the nozzles. Theto Samples of scale were turbine rotor w e r e de check the

Engineering, Barber-Nicholas

2011-01-01T23:59:59.000Z

419

A multi-scale approach to statistical and model-based structural health monitoring with application to embedded sensing for wind energy  

E-Print Network (OSTI)

in a composite wind turbine rotor blade," Structural Healthdetection in composite wind turbine blades," Journal offor structural monitoring of wind turbine rotor blades," in

Taylor, Stuart Glynn

2013-01-01T23:59:59.000Z

420

Dynamic average-value modeling of doubly-fed induction generator wind energy conversion systems.  

E-Print Network (OSTI)

??In a Doubly-fed Induction Generator (DFIG) wind energy conversion system, the rotor of a wound rotor induction generator is connected to the grid via a… (more)

Shahab, Azin

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

Assessing Vehicle Electricity Demand Impacts on California Electricity Supply  

E-Print Network (OSTI)

AND PARAMETERS A Wind turbine rotor-swept area (m 2 ) AEOm 3 ), A is rotor-swept area of the turbine (m 2 ), C p is

McCarthy, Ryan W.

2009-01-01T23:59:59.000Z

422

CLEAN METAL NUCLEATED CASTING OF SUPERALLOYS  

Science Conference Proceedings (OSTI)

Conventional Turbine Rotor Production & Need for Ingot Casting Innovation. The production of large gas turbine rotor forgings made from high temperature ...

423

IGUS Innovative Technische Systeme | Open Energy Information  

Open Energy Info (EERE)

the condition of rotor blades in wind turbines, including diagnosing the formation of ice on the rotor blades. References IGUS Innovative Technische Systeme1 LinkedIn...

424

Half-Scale Model Tests on the Three Quarter Wave R.F. System for the 184-inch Frequency Modulated Cyclotron  

E-Print Network (OSTI)

The following a.pparent condenser capacity can be calculatedvoltage to the dee and condenser rotor was not included asfrequency funotion. The condenser rotor was arranged to be

Anderson, Robert L.

2010-01-01T23:59:59.000Z

425

Hybrid-secondary uncluttered permanent magnet machine and ...  

An electric machine (40) has a stator (43), a permanent magnet rotor (38) with permanent magnets (39) and a magnetic coupling uncluttered rotor (46) for inducing a ...

426

ELECTRIC POWER & LIGHT MAGAZINE TRANS-WARP™ ...  

Science Conference Proceedings (OSTI)

... rotors. The design has each rotor direct drive a generator, thereby eliminating the need for step-up gearboxes. These same ...

2011-08-02T23:59:59.000Z

427

Microsoft PowerPoint - C-Mod_BPM_2010_21.ppt [Compatibility Mode...  

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

"do not return the rotor to service" * Subsequent materials tests show that the rotor steel has good properties well beyond good properties, well beyond those used in the...

428

Wind Turbine Blade Test Definition of the DeWind DW90 Rotor Blade: Cooperative Research and Development Final Report, CRADA Number CRD-09-326  

DOE Green Energy (OSTI)

This CRADA was developed as a funds-in CRADA with DeWind to assess the suitability of facilities and equipment at the NWTC for performing certification blade testing on wind turbine blades made from advanced materials. DeWind produces a wind turbine blade which includes the use of high-strength and stiffness materials. NREL and DeWind had a mutual interest in defining the necessary facilities, equipment, and test methods for testing large wind turbine blades which incorporate advanced materials and adaptive structures, as the demands on test equipment and infrastructure are greater than current capabilities. Work under this CRADA would enable DeWind to verify domestic capability for certification-class static and fatigue testing, while NREL would be able to identify and develop specialized test capabilities based on the test requirements.

Hughes, S.

2012-05-01T23:59:59.000Z

429

Design of a four rotor unmanned aerial vehicle capable of sustaining zero-roll and zero-pitch flight using vector thrusting  

E-Print Network (OSTI)

In recent decades, remote controlled airplanes and helicopters equipped with video cameras have been used by the movie industry, photographers, and for surveillance. The military deploys these unmanned aerial vehicles ...

Hilton, Danny Charles

2005-01-01T23:59:59.000Z

430

Abstract--This paper proposes a methodology to decide the optimal matching between the size of the rotor of a wind turbine  

E-Print Network (OSTI)

stockage". EPF'04 (Electronique de Puissance du Futur). Toulouse, 15-17 septembre 2004. [3] A.M. De Broe, S.Drouilhet

Paris-Sud XI, Université de

431

Passive magnetic bearing configurations  

Science Conference Proceedings (OSTI)

A journal bearing provides vertical and radial stability to a rotor of a passive magnetic bearing system when the rotor is not rotating and when it is rotating. In the passive magnetic bearing system, the rotor has a vertical axis of rotation. Without the journal bearing, the rotor is vertically and radially unstable when stationary, and is vertically stable and radially unstable when rotating.

Post, Richard F. (Walnut Creek, CA)

2011-01-25T23:59:59.000Z

432

A Comparision of Sensorless Control Strategies of Doubly Fed Induction Generator  

Science Conference Proceedings (OSTI)

Decoupled control has been widely used in the DIFG (doubly fed induction generator) which needs the rotor position as well as the rotor speed for the control system. A lot of research has been done in the sensorless control field for the DFIG because ... Keywords: Doubly Fed Induction Generator(DFIG), Decoupled Control, PI adjustor, Rotor position, Rotor speed, Sensorless control, MRAS

Xin Hao; Chong Wei Zhang; Xing Zhang

2009-10-01T23:59:59.000Z

433

Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature  

SciTech Connect

The present invention maintains constant torque in an inverter driven AC induction motor during variations in rotor temperature. It is known that the torque output of a given AC induction motor is dependent upon rotor temperature. At rotor temperatures higher than the nominal operating condition the rotor impedance increases, reducing the rotor current and motor torque. In a similar fashion, the rotor impedance is reduced resulting in increased rotor current and motor torque when the rotor temperature is lower than the nominal operating condition. The present invention monitors the bus current from the DC supply to the inverter and adjusts the slip frequency of the inverter drive to maintain a constant motor torque. This adjustment is based upon whether predetermined conditions implying increased rotor temperature or decreased rotor temperature exist for longer that a predetermined interval of time.

Kelledes, William L. (Brighton, MI); St. John, Don K. (Livonia, MI)

1992-01-01T23:59:59.000Z

434

System and method to determine electric motor efficiency nonintrusively  

Science Conference Proceedings (OSTI)

A system and method for nonintrusively determining electric motor efficiency includes a processor programed to, while the motor is in operation, determine a plurality of stator input currents, electrical input data, a rotor speed, a value of stator resistance, and an efficiency of the motor based on the determined rotor speed, the value of stator resistance, the plurality of stator input currents, and the electrical input data. The determination of the rotor speed is based on one of the input power and the plurality of stator input currents. The determination of the value of the stator resistance is based on at least one of a horsepower rating and a combination of the plurality of stator input currents and the electrical input data. The electrical input data includes at least one of an input power and a plurality of stator input voltages.

Lu, Bin (Kenosha, WI); Habetler, Thomas G. (Snellville, GA); Harley, Ronald G. (Lawrenceville, GA)

2011-08-30T23:59:59.000Z

435

Giromill wind tunnel test and analysis. Volume II. Technical discussion. Final report, June 1976--October 1977  

DOE Green Energy (OSTI)

A wind tunnel test of a Giromill rotor was conducted. The objective of this test was to substantiate the performance computed by the Larsen cyclogiro vortex theory. Additional objectives were to obtain performance comparison data between the Giromill, a sinusoidal blade modulation Giromill, a Darrieus rotor, and a modified Darrieus rotor that flips the blades a few degrees. A three bladed Giromill rotor having a diameter of 2.13 m (7 ft) and a span of 1.52 m (5 ft) was tested in the McDonnell Aircraft Company 15 x 20 ft Mini Speed Wind Tunnel. The blade modulations were accomplished through use of a cam and push rod arrangement. Replaceable cams provided the desired blade modulation at the various operating points. Various operating conditions were achieved by adjusting the rotor RPM and tunnel speed. The results show that the Giromill has good performance, equal to or much better than that predicted by theory, and outperforms the other types of vertical axis wind turbines tested.

Moran, W.A.

1977-10-01T23:59:59.000Z

436

Film Cooling, Heat Transfer and Aerodynamic Measurements in a Three Stage Research Gas Turbine  

E-Print Network (OSTI)

The existing 3-stage turbine research facility at the Turbomachinery Performance and Flow Research Laboratory (TPFL), Texas A and M University, is re-designed and newly installed to enable coolant gas injection on the first stage rotor platform to study the effects of rotation on film cooling and heat transfer. Pressure and temperature sensitive paint techniques are used to measure film cooling effectiveness and heat transfer on the rotor platform respectively. Experiments are conducted at three turbine rotational speeds namely, 2400rpm, 2550rpm and 3000rpm. Interstage aerodynamic measurements with miniature five hole probes are also acquired at these speeds. The aerodynamic data characterizes the flow along the first stage rotor exit, second stage stator exit and second stage rotor exit. For each rotor speed, film cooling effectiveness is determined on the first stage rotor platform for upstream stator-rotor gap ejection, downstream discrete hole ejection and a combination of upstream gap and downstream hole ejection. Upstream coolant ejection experiments are conducted for coolant to mainstream mass flow ratios of MFR=0.5%, 1.0%, 1.5% and 2.0% and downstream discrete hole injection tests corresponding to average hole blowing ratios of M = 0.5, 0.75, 1.0, 1.25, 1.5, 1.75 and 2.0 for each turbine speed. To provide a complete picture of hub cooling under rotating conditions, experiments with simultaneous injection of coolant gas through upstream and downstream injection are conducted for an of MFR=1% and Mholes=0.75, 1.0 and 1.25 for the three turbine speeds. Heat transfer coefficients are determined on the rotor platform for similar upstream and downstream coolant injection. Rotation is found to significantly affect the distribution of coolant on the platform. The measured effectiveness magnitudes are lower than that obtained with numerical simulations. Coolant streams from both upstream and downstream injection orient themselves towards the blade suction side. Passage vortex cuts-off the coolant film for the lower MFR for upstream injection. As the MFR increases, the passage vortex effects are diminished. Effectiveness was maximum when Mholes was closer to one as the coolant ejection velocity is approximately equal to the mainstream relative velocity for this blowing ratio. Heat transfer coefficient and film cooling effectiveness increase with increasing rotational speed for upstream rotor stator gap injection while for downstream hole injection the maximum effectiveness and heat transfer coefficients occur at the reference speed of 2550rpm.

Suryanarayanan, Arun

2009-05-01T23:59:59.000Z

437

Stator for a rotating electrical machine having multiple control windings  

DOE Patents (OSTI)

A rotating electric machine is provided which includes multiple independent control windings for compensating for rotor imbalances and for levitating/centering the rotor. The multiple independent control windings are placed at different axial locations along the rotor to oppose forces created by imbalances at different axial locations along the rotor. The multiple control windings can also be used to levitate/center the rotor with a relatively small magnetic field per unit area since the rotor and/or the main power winding provides the bias field.

Shah, Manoj R. (Latham, NY); Lewandowski, Chad R. (Amsterdam, NY)

2001-07-17T23:59:59.000Z

438

Stator for Rotating Electrical Machine Having Multiple Controlwindings  

DOE Patents (OSTI)

A rotating electric machine is provided which includes multiple independent control windings for compensating for rotor imbalances and for levitating/centering the rotor. The multiple independent control windings are placed at different axial locations along the rotor to oppose forces created by imbalances at different axial locations along the rotor. The multiple control windings can also be used to levitate/center the rotor with a relatively small magnetic field per unit area since the rotor and/or the main power winding provides the biasfield.

Shah, Manoj R.; Lewandowski, Chad R.

1999-05-05T23:59:59.000Z

439

Simplifying and speeding the management of intra-node cache coherence  

DOE Patents (OSTI)

A method and apparatus for managing coherence between two processors of a two processor node of a multi-processor computer system. Generally the present invention relates to a software algorithm that simplifies and significantly speeds the management of cache coherence in a message passing parallel computer, and to hardware apparatus that assists this cache coherence algorithm. The software algorithm uses the opening and closing of put/get windows to coordinate the activated required to achieve cache coherence. The hardware apparatus may be an extension to the hardware address decode, that creates, in the physical memory address space of the node, an area of virtual memory that (a) does not actually exist, and (b) is therefore able to respond instantly to read and write requests from the processing elements.

Blumrich, Matthias A. (Ridgefield, CT); Chen, Dong (Croton on Hudson, NY); Coteus, Paul W. (Yorktown Heights, NY); Gara, Alan G. (Mount Kisco, NY); Giampapa, Mark E. (Irvington, NY); Heidelberger, Phillip (Cortlandt Manor, NY); Hoenicke, Dirk (Ossining, NY); Ohmacht, Martin (Yorktown Heights, NY)

2012-04-17T23:59:59.000Z

440

How Does a Wind Turbine Work?  

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

Wind turbines operate on a simple principle. The energy in the wind turns two or three propeller-like blades around a rotor. The rotor is connected to the main shaft, which spins a generator to...

Note: This page contains sample records for the topic "rotor rotor speed-the" 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

NREL: Wind Research - News Release Archives  

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

Center (NWTC) received a facelift last month when an NWTC team replaced its two-bladed rotor with a new three-bladed rotor from GE. January 4, 2007 President Bush Approves...

442

PowerPoint Presentation  

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

(HI,xn) reactions through -ray intensity measurements * Clear difference between non-rotor (N < 86) and rotor nuclei (N > 86) * I sat is independent of bombarding energy when it...

443

NETL: IEP ? CO2 Compression - Ramgen Supersonic Shock Wave Compressio...  

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

Engine Technology Project No.: FC26-06NT42651 & FE0000493 Photograph of a Rampressor Rotor Photograph of a Rampressor Rotor Ramgen Power Systems is developing a supersonic shock...

444

HYDROGEN AND DEUTERIUM NMR OF SOLIDS BY MAGIC ANGLE SPINNING  

E-Print Network (OSTI)

6) rotor cap, (7) gas bearing inlet hole, (8) turbine driverotor axis sta- bility for the deuterium experiments (29). turbineturbine drive gas inlet hole. De1rin and Kel-F polymers. for rotor

Eckman, R.R.

2010-01-01T23:59:59.000Z

445

An experimental and numerical study of wind turbine seismic behavior  

E-Print Network (OSTI)

turbine with an 18 m tall tower and 13 m rotor diameter. Inwith a 38 meter tall steel tower designed for installationturbine with a 44 m tall steel tower and 52 m rotor diameter

Prowell, I.

2011-01-01T23:59:59.000Z

446

Calibration of turbine meters  

Science Conference Proceedings (OSTI)

... rotor meter with its casing removed and a single rotor meter with casing and a magnetic pick-off ... The motor?driven piston works like a syringe pump. ...

2012-08-14T23:59:59.000Z

447

Simplified hybrid-secondary uncluttered machine and method ...  

An electric machine (40, 40') has a stator (43) and a rotor (46) and a primary air gap (48) has secondary coils (47c, 47d) separated from the rotor (46) by a ...

448

Wind Power | Open Energy Information  

Open Energy Info (EERE)

to electricity by rotating propeller-like blades around a rotor. The rotor turns the drive shaft, which turns an electric generator. Three key factors affect the amount of...

449

Reviewed by The Plan Teams for the Groundfish Fisheries  

E-Print Network (OSTI)

. The device is a cylindrical rotor surrounded by a mixing bowl. The spinning rotor acts as a mixer EAM potential developed for plutonium by M. Baskes [10]. #12;19 This is important since Pu

450

2 Science Opportunities The proposed NSLS-II facility, a state-of-the-art medium-energy high brightness X-ray storage ring  

E-Print Network (OSTI)

. The device is a cylindrical rotor surrounded by a mixing bowl. The spinning rotor acts as a mixer EAM potential developed for plutonium by M. Baskes [10]. #12;19 This is important since Pu

Ohta, Shigemi

451

Impact of unsteady flow processes on the performance of a high speed axial flow compressor  

E-Print Network (OSTI)

This thesis examines the unsteady interactions between blade rows in a high Mach number, highly-loaded compressor stage. Two straight vane/rotor configurations with different axial spacing between vane and rotor are ...

Botros, Barbara Brenda

2008-01-01T23:59:59.000Z

452

HOUSINGS AND MOUNTINGS FOR CENTRIFUGES  

DOE Patents (OSTI)

A protective housing for a gas centrifuge comprises a slidable connection between flanges and framework portions for absorbing rotational energy in case of bursting of the rotor and a sealing means for sealing the rotor chamber.

Rushing, F.C.

1960-08-16T23:59:59.000Z

453

ESS 2012 Peer Review - Amber Kinetics Flywheel Energy Storage...  

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

7700 RPM - Spin testing accelerates rotor to: 530 ms and 11,000 RPM - Rotor stores 10 kWh of kinetic energy @ 11,000 RPM (2x more than design speed) - All testing conducted in...

454

Pressure and Vacuum Group Homepage  

Science Conference Proceedings (OSTI)

... piston gauges, liquid-column manometers, capacitance diaphragm gauges, spinning rotor gauges, ionization gauges, and calibrated gas leaks ...

2013-06-12T23:59:59.000Z

455

CX-009383: Categorical Exclusion Determination | Department of...  

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

Exclusion Determination CX-009383: Categorical Exclusion Determination Hybrid Rotor Compression for Multiphase and Liquids-Rich Wellhead Production Applications (Summary...

456

Turbine inter-disk cavity cooling air compressor  

DOE Patents (OSTI)

The inter-disk cavity between turbine rotor disks is used to pressurize cooling air. A plurality of ridges extend radially outwardly over the face of the rotor disks. When the rotor disks are rotated, the ridges cause the inter-disk cavity to compress air coolant flowing through the inter-disk cavity en route to the rotor blades. The ridges eliminate the need for an external compressor to pressurize the air coolant.

Chupp, Raymond E. (Oviedo, FL); Little, David A. (Oviedo, FL)

1998-01-01T23:59:59.000Z

457

Water injected fuel cell system compressor  

DOE Patents (OSTI)

A fuel cell system including a dry compressor for pressurizing air supplied to the cathode side of the fuel cell. An injector sprays a controlled amount of water on to the compressor's rotor(s) to improve the energy efficiency of the compressor. The amount of water sprayed out the rotor(s) is controlled relative to the mass flow rate of air inputted to the compressor.

Siepierski, James S. (Williamsville, NY); Moore, Barbara S. (Victor, NY); Hoch, Martin Monroe (Webster, NY)

2001-01-01T23:59:59.000Z

458

Power and Frequency Control as it Relates to Wind-Powered Generation  

E-Print Network (OSTI)

turbine power if the wind is favorable at the moment and response provided by borrowing energy from the rotors

Lacommare, Kristina S H

2011-01-01T23:59:59.000Z

459

Turbine inter-disk cavity cooling air compressor  

DOE Patents (OSTI)

The inter-disk cavity between turbine rotor disks is used to pressurize cooling air. A plurality of ridges extend radially outwardly over the face of the rotor disks. When the rotor disks are rotated, the ridges cause the inter-disk cavity to compress air coolant flowing through the inter-disk cavity en route to the rotor blades. The ridges eliminate the need for an external compressor to pressurize the air coolant. 5 figs.

Chupp, R.E.; Little, D.A.

1998-01-06T23:59:59.000Z

460

ANALYSIS OF THE CALIFORNIA ENERGY INDUSTRY  

E-Print Network (OSTI)

turbine generators (WTG) , and looks at costs of delivered energy as a function of several parameters, including rotor

Authors, Various

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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.


461

High-Mn Austenitic Stainless Steel - Oak Ridge National Laboratory  

chemical reactor vessels, turbine casings, turbine rotors, etc. Stage of Development: Proof of Principle ... Nuclear Fusion Research Power Generation ...

462

Mathematical model and the dynamic simulation of an electromechanical rotary device. [SLENOID  

SciTech Connect

A mathematical model of an electro-mechanical rotary device is presented. This device contains a rotor, stator, and two spring-loaded arms which restrict the rotor motion. The desired action is the alignment of the rotor and the consequent movement of the arms. The SLENOID computer program for calculating the magnetic torque, air gap permeance, spring torque, damping effects, and motion of the rotor and arms is described. (LCL)

Emergy, J.D.

1980-02-01T23:59:59.000Z

463

High temperature turbine engine structure  

DOE Patents (OSTI)

A high temperature turbine engine includes a rotor portion having axially stacked adjacent ceramic rotor parts. A ceramic/ceramic joint structure transmits torque between the rotor parts while maintaining coaxial alignment and axially spaced mutually parallel relation thereof despite thermal and centrifugal cycling.

Boyd, Gary L. (Tempe, AZ)

1991-01-01T23:59:59.000Z

464

DESIGN AND OPERATION OF A WIRELINE RETRIEVABLE MOTOR DRIVEN CORE BARREL  

E-Print Network (OSTI)

of the operating point near to optimality. The reference of turbine rotor speed is adjusted such that the turbine at which the turbine should operate for producing maxi- mum power. MPPT controller will generate a rotor as 2 38 where Pwt is the rotor mechanical power (W), wt is the turbine torque (Nm), v is the wind speed

465

Plant Guide to Turbine Disk Rim Inspection  

Science Conference Proceedings (OSTI)

Steam turbine disk rims are one of the most highly stressed areas of the rotor. Periodic inspection of the rims provides information on the operability of the rotor, including the identification of conditions that could result in catastrophic failure of the rotor.

2006-12-18T23:59:59.000Z

466

Relationship Between Turbine Rotor and Disk Metallurgical Characteristics and Stress Corrosion Cracking Behavior: Volume 1: Test Mat erials and Laboratory Test Program; Volume 2: Field Test Program and Overall Conclusions  

Science Conference Proceedings (OSTI)

Heat treatment to minimize temper embrittlement associated with grain boundary segregation is not a viable solution to the costly problem of stress corrosion cracking (SCC) of nuclear low-pressure steam turbine disks. But an on-line SCC sensor is feasible and could lead to early detection of adverse service conditions before damage occurs.

1986-12-01T23:59:59.000Z

467

Design of a novel rotary compact power pack for the series hybrid electric vehicle. Design and simulation of a compact power pack consisting of a novel rotary engine and outer rotor induction machine for the series hybrid electric vehicle powertrain.  

E-Print Network (OSTI)

??Hybrid electric vehicles significantly reduce exhaust emissions and increase fuel economy. Power packs are the most fundamental components in a series powertrain configuration of a… (more)

Amirian, Hossein

2010-01-01T23:59:59.000Z

468

Velocity pump reaction turbine  

DOE Patents (OSTI)

An expanding hydraulic/two-phase velocity pump reaction turbine including a dual concentric rotor configuration with an inter-rotor annular flow channel in which the inner rotor is mechanically driven by the outer rotor. In another embodiment, the inner rotor is immobilized and provided with gas recovery ports on its outer surface by means of which gas in solution may be recovered. This velocity pump reaction turbine configuration is capable of potential energy conversion efficiencies of up to 70%, and is particularly suited for geothermal applications.

House, Palmer A. (Walnut Creek, CA)

1982-01-01T23:59:59.000Z

469

Velocity pump reaction turbine  

DOE Patents (OSTI)

An expanding hydraulic/two-phase velocity pump reaction turbine including a dual concentric rotor configuration with an inter-rotor annular flow channel in which the inner rotor is mechanically driven by the outer rotor. In another embodiment, the inner rotor is immobilized and provided with gas recovery ports on its outer surface by means of which gas in solution may be recovered. This velocity pump reaction turbine configuration is capable of potential energy conversion efficiencies of up to 70%, and is particularly suited for geothermal applications.

House, Palmer A. (Walnut Creek, CA)

1984-01-01T23:59:59.000Z

470

Methods and apparatus for cooling wind turbine generators  

DOE Patents (OSTI)

A wind turbine generator includes a stator having a core and a plurality of stator windings circumferentially spaced about a generator longitudinal axis. A rotor is rotatable about the generator longitudinal axis, and the rotor includes a plurality of magnetic elements coupled to the rotor and cooperating with the stator windings. The magnetic elements are configured to generate a magnetic field and the stator windings are configured to interact with the magnetic field to generate a voltage in the stator windings. A heat pipe assembly thermally engaging one of the stator and the rotor to dissipate heat generated in the stator or rotor.

Salamah, Samir A. (Niskayuna, NY); Gadre, Aniruddha Dattatraya (Rexford, NY); Garg, Jivtesh (Schenectady, NY); Bagepalli, Bharat Sampathkumaran (Niskayuna, NY); Jansen, Patrick Lee (Alplaus, NY); Carl, Jr., Ralph James (Clifton Park, NY)

2008-10-28T23:59:59.000Z

471

Supersonic gas compressor  

Science Conference Proceedings (OSTI)

A gas compressor based on the use of a driven rotor having a compression ramp traveling at a local supersonic inlet velocity (based on the combination of inlet gas velocity and tangential speed of the ramp) which compresses inlet gas against a stationary sidewall. In using this method to compress inlet gas, the supersonic compressor efficiently achieves high compression ratios while utilizing a compact, stabilized gasdynamic flow path. Operated at supersonic speeds, the inlet stabilizes an oblique/normal shock system in the gasdyanamic flow path formed between the rim of the rotor, the strakes, and a stationary external housing. Part load efficiency is enhanced by the use of a pre-swirl compressor, and using a bypass stream to bleed a portion of the intermediate pressure gas after passing through the pre-swirl compressor back to the inlet of the pre-swirl compressor. Inlet guide vanes to the compression ramp enhance overall efficiency.

Lawlor, Shawn P. (Bellevue, WA); Novaresi, Mark A. (San Diego, CA); Cornelius, Charles C. (Kirkland, WA)

2007-11-13T23:59:59.000Z

472

Gas turbine power plant with supersonic shock compression ramps  

SciTech Connect

A gas turbine engine. The engine is based on the use of a gas turbine driven rotor having a compression ramp traveling at a local supersonic inlet velocity (based on the combination of inlet gas velocity and tangential speed of the ramp) which compresses inlet gas against a stationary sidewall. The supersonic compressor efficiently achieves high compression ratios while utilizing a compact, stabilized gasdynamic flow path. Operated at supersonic speeds, the inlet stabilizes an oblique/normal shock system in the gasdynamic flow path formed between the rim of the rotor, the strakes, and a stationary external housing. Part load efficiency is enhanced by use of a lean pre-mix system, a pre-swirl compressor, and a bypass stream to bleed a portion of the gas after passing through the pre-swirl compressor to the combustion gas outlet. Use of a stationary low NOx combustor provides excellent emissions results.

Lawlor, Shawn P. (Bellevue, WA); Novaresi, Mark A. (San Diego, CA); Cornelius, Charles C. (Kirkland, WA)

2008-10-14T23:59:59.000Z

473

Enertech 2-kW high-reliability wind system. Phase II. Fabrication and testing  

SciTech Connect

A high-reliability wind machine rated for 2 kW in a 9 m/s wind has been developed. Activities are summarized that are centered on the fabrication and testing of prototypes of the wind machine. The test results verified that the wind machine met the power output specification and that the variable-pitch rotor effectively controlled the rotor speed for wind speeds up to 50 mph. Three prototypes of the wind machine were shipped to the Rocky Flats test center in September through November of 1979. Work was also performed to reduce the start-up wind speed. The start-up wind speed to the Enertech facility has been reduced to 4.5 m/s.

Cordes, J.A.; Johnson, B.A.

1981-06-01T23:59:59.000Z

474

Device for measuring the fluid density of a two-phase mixture  

DOE Patents (OSTI)

A device for measuring the fluid density of a two-phase mixture flowing through a tubular member. A rotor assembly is rotatively supported within the tubular member so that it can also move axially within the tubular member. The rotor assembly is balanced against a pair of springs which exert an axial force in the opposite direction upon the rotor assembly. As a two-phase mixture flows through the tubular member it contacts the rotor assembly causing it to rotate about its axis. The rotor assembly is forced against and partially compresses the springs. Means are provided to measure the rotational speed of the rotor assembly and the linear displacement of the rotor assembly. From these measurements the fluid density of the two-phase mixture is calculated.

Cole, Jack H. (Idaho Falls, ID)

1980-01-01T23:59:59.000Z

475

Rotatable seal assembly. [Patent application; rotating targets  

DOE Patents (OSTI)

An assembly is provided for rotatably supporting a rotor on a stator so that vacuum chambers in the rotor and stator remain in communication while the chambers are sealed from ambient air, which enables the use of a ball bearing or the like to support most of the weight of the rotor. The apparatus includes a seal device mounted on the rotor to rotate therewith, but shiftable in position on the rotor while being sealed to the rotor as by an O-ring. The seal device has a flat face that is biased towards a flat face on the stator, and pressurized air is pumped between the faces to prevent contact between them while spacing them a small distance apart to avoid the inflow of large amounts of air between the faces and into the vacuum chambers.

Logan, C.M.; Garibaldi, J.L.

1980-11-12T23:59:59.000Z

476

Rotatable seal assembly  

DOE Patents (OSTI)

An assembly is provided for rotatably supporting a rotor on a stator so that vacuum chambers in the rotor and stator remain in communication while the chambers are sealed from ambient air, which enables the use of a ball bearing or the like to support most of the weight of the rotor. The apparatus includes a seal device mounted on the rotor to rotate therewith, but shiftable in position on the rotor while being sealed to the rotor as by an O-ring. The seal device has a flat face that is biased towards a flat face on the stator, and pressurized air is pumped between the faces to prevent contact between them while spacing them a small distance apart to avoid the inflow of large amounts of air between the faces and into the vacuum chambers.

Logan, Clinton M. (Pleasanton, CA); Garibaldi, Jack L. (Livermore, CA)

1982-01-01T23:59:59.000Z

477

Variable displacement blower  

DOE Patents (OSTI)

A blower having a stationary casing for rotatably supporting a rotor assembly having a series of open ended chambers arranged to close against the surrounding walls of the casing. Pistons are slidably mounted within each chamber with the center of rotation of the pistons being offset in regard to the center of rotation of the rotor assembly whereby the pistons reciprocate in the chambers as the rotor assembly turns. As inlet port communicates with the rotor assembly to deliver a working substance into the chamber as the pistons approach a top dead center position in the chamber while an outlet port also communicates with the rotor to exhaust the working substance as the pistons approach a bottom dead center position. The displacement of the blower is varied by adjusting the amount of eccentricity between the center of rotation of the pistons and the center of rotation of the rotor assembly.

Bookout, Charles C. (Niskayuna, NY); Stotts, Robert E. (Clifton Park, NY); Waring, Douglass R. (Ballston Spa, NY); Folsom, Lawrence R. (Ohain, BE)

1986-01-01T23:59:59.000Z

478

Method and apparatus for measuring shear modulus and viscosity of a monomolecular film  

DOE Patents (OSTI)

Apparatus for measuring the shear modulus of a monomolecular film comprises a circular trough having inwardly sloping sides containing a liquid for supporting the monolayer on the surface thereof; a circular rotor suspended above the trough such that the lower surface of the rotor contacts the surface of the liquid, positioned such that the axis of the rotor is concentric with the axis of the trough and freely rotable about its axis; means for hydrostatically compressing the monolayer in the annular region formed between the rotor and the sides of the trough; and means for rotating the trough about its axis. Preferably, hydrostatic compression of the monolayer is achieved by removing liquid from the bottom of the trough (decreasing the surface area) while raising the trough vertically along its axis to maintain the monolayer at a constant elevation (and maintain rotor contact). In order to measure viscosity, a means for rotating the rotor about its axis is added to the apparatus.

Abraham, B.M.; Miyano, K.; Ketterson, J.B.

1983-10-18T23:59:59.000Z

479

Method and apparatus for measuring shear modulus and viscosity of a monomolecular film  

DOE Patents (OSTI)

Instrument for measuring the shear modulus of a monomolecular film comprises a circular trough having inwardly sloping sides containing a liquid for supporting the monolayer on the surface thereof; a circular rotor suspended above the trough such that the lower surface of the rotor contacts the surface of the liquid, positioned such that the axis of the rotor is concentric with the axis of the trough and freely rotable about its axis; apparatus for hydrostatically compressing the monolayer in the annular region formed between the rotor and the sides of the trough; and apparatus for rotating the trough about its axis. Preferably, hydrostatic compression of the monolayer is achieved by removing liquid from the bottom of the trough (decreasing the surface area) while raising the trough vertically along its axis to maintain the monolayer at a constant elevation (and maintain rotor contact). In order to measure viscosity, a apparatus for rotating the rotor about its axis is added to the apparatus.

Abraham, Bernard M. (Oak Park, IL); Miyano, Kenjiro (Sendai, JP); Ketterson, John B. (Evanston, IL)

1985-01-01T23:59:59.000Z

480

Gas turbine sealing apparatus  

DOE Patents (OSTI)

A gas turbine includes forward and aft rows of rotatable blades, a row of stationary vanes between the forward and aft rows of rotatable blades, an annular intermediate disc, and a seal housing apparatus. The forward and aft rows of rotatable blades are coupled to respective first and second portions of a disc/rotor assembly. The annular intermediate disc is coupled to the disc/rotor assembly so as to be rotatable with the disc/rotor assembly during operation of the gas turbine. The annular intermediate disc includes a forward side coupled to the first portion of the disc/rotor assembly and an aft side coupled to the second portion of the disc/rotor assembly. The seal housing apparatus is coupled to the annular intermediate disc so as to be rotatable with the annular intermediate disc and the disc/rotor assembly during operation of the gas turbine.

Wiebe, David J; Wessell, Brian J; Ebert, Todd; Beeck, Alexander; Liang, George; Marussich, Walter H

2013-02-19T23:59:59.000Z

Note: This page contains sample records for the topic "rotor rotor speed-the" 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.


481

Detailed design, fabrication and testing of an engineering prototype compensated pulsed alternator. Final report  

DOE Green Energy (OSTI)

The design, fabrication, and test results of a prototype compensated pulsed alternator are discussed. The prototype compulsator is a vertical shaft single phase alternator with a rotating armature and salient pole stator. The machine is designed for low rep rate pulsed duty and is sized to drive a modified 10 cm Beta amplifier. The load consists of sixteen 15 mm x 20 mm x 112 cm long xenon flashlamps connected in parallel. The prototype compulsator generates an open circuit voltage of 6 kV, 180 Hz, at a maximum design speed of 5400 rpm. At maximum speed, the inertial energy stored in the compulsator rotor is 3.4 megajoules.

Bird, W.L. Jr.; Woodson, H.H.

1980-03-01T23:59:59.000Z

482

Trapped field internal dipole superconducting motor generator  

DOE Patents (OSTI)

A motor generator including a high temperature superconductor rotor and an internally disposed coil assembly. The motor generator superconductor rotor is constructed of a plurality of superconductor elements magnetized to produce a dipole field. The coil assembly can be either a conventional conductor or a high temperature superconductor. The superconductor rotor elements include a magnetization direction and c-axis for the crystals of the elements and which is oriented along the magnetization direction.

Hull, John R. (Downers Grove, IL)

2001-01-01T23:59:59.000Z

483

Extended cage adjustable speed electric motors and drive packages  

DOE Patents (OSTI)

The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the rotor cage. The motor produces less harmonics than existing doubly-fed motors. Consequently, a new type of low cost, high efficiency drive is produced.

Hsu, John S. (Oak Ridge, TN)

1999-01-01T23:59:59.000Z

484

Method and apparatus for wind turbine braking  

DOE Patents (OSTI)

A method for braking a wind turbine including at least one rotor blade coupled to a rotor. The method includes selectively controlling an angle of pitch of the at least one rotor blade with respect to a wind direction based on a design parameter of a component of the wind turbine to facilitate reducing a force induced into the wind turbine component as a result of braking.

Barbu, Corneliu (Laguna Hills, CA); Teichmann, Ralph (Nishkayuna, NY); Avagliano, Aaron (Houston, TX); Kammer, Leonardo Cesar (Niskayuna, NY); Pierce, Kirk Gee (Simpsonville, SC); Pesetsky, David Samuel (Greenville, SC); Gauchel, Peter (Muenster, DE)

2009-02-10T23:59:59.000Z

485

Turbine-meter air calibration proves accurate for gas service  

SciTech Connect

This article presents theory, laboratory verificati*on tests, and field evaluation test data that show that a well-engineered gas-turbine meter (single rotor or tandem rotors) calibrated in air has the same accuracy when operating in natural gas at the same line pressure and flow rate (or the same Reynolds number). The only exception occurs at very low flow rates during which the rotor slip due to mechanical friction is no loner negligible.

Lee, W.F.Z.

1988-04-18T23:59:59.000Z

486

Hermetically sealed superconducting magnet motor  

DOE Patents (OSTI)

A hermetically sealed superconducting magnet motor includes a rotor separated from a stator by either a radial gap, an axial gap, or a combined axial and radial gap. Dual conically shaped stators are used in one embodiment to levitate a disc-shaped rotor made of superconducting material within a conduit for moving cryogenic fluid. As the rotor is caused to rotate when the field stator is energized, the fluid is pumped through the conduit. 6 figs.

DeVault, R.C.; McConnell, B.W.; Phillips, B.A.

1996-07-02T23:59:59.000Z

487

Hermetically sealed superconducting magnet motor  

DOE Patents (OSTI)

A hermetically sealed superconducting magnet motor includes a rotor separated from a stator by either a radial gap, an axial gap, or a combined axial and radial gap. Dual conically shaped stators are used in one embodiment to levitate a disc-shaped rotor made of superconducting material within a conduit for moving cryogenic fluid. As the rotor is caused to rotate when the field stator is energized, the fluid is pumped through the conduit.

DeVault, Robert C. (Knoxville, TN); McConnell, Benjamin W. (Knoxville, TN); Phillips, Benjamin A. (Benton Harbor, MI)

1996-01-01T23:59:59.000Z

488

Extended cage adjustable speed electric motors and drive packages  

DOE Patents (OSTI)

The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the rotor cage. The motor produces less harmonics than existing doubly-fed motors. Consequently, a new type of low cost, high efficiency drive is produced. 12 figs.

Hsu, J.S.

1999-03-23T23:59:59.000Z

489

Generator Fan/Blower Design, Inspection, and Maintenance  

Science Conference Proceedings (OSTI)

Turbo-generator rotor cooling fans and blowers are highly stressed components of a generator rotor. As such, their failures can result in expensive damages and extended outages. This best practices document provides guidelines that help plant managers understand potential failure mechanisms and their root causes, anticipate issues before failures occur, and prepare inspection and contingency plans.The guidelines are applicable to both nuclear and fossil turbo-generator rotors. Both axial ...

2012-12-13T23:59:59.000Z

490

Addendum to a proposal to NSF to sponsor a vertical-axis wind turbine research program  

SciTech Connect

Information is presented concerning the performance evaluation of a 15 foot-diameter test bed Darrieus rotor, Darrieus rotor wind tunnel tests, Savonius rotor wind tunnel tests, blade manufacturing techniques for 15 foot-diameter and 35 foot-diameter wind turbines, static and dynamic structural analysis, production prototype design of a 15 foot-diameter turbine, production prototype design of 35 foot-diameter turbine, and aerodynamic performance studies.

Blackwell, B.F.; Feltz, L.V.; Rightley, E.C.

1974-11-01T23:59:59.000Z

491

Low Wind Speed Turbine Project Conceptual Design Study: Advanced Independent Pitch Control; July 30, 2002--July 31, 2004 (Revised)  

DOE Green Energy (OSTI)

AES conducted a conceptual study of independent pitch control using inflow angle sensors. The control strategy combined input from turbine states (rotor speed, rotor azimuth, each blade pitch) with inflow angle measurements (each blade angle of attack at station 11 of 15) to derive blade pitch demand signals. The controller reduced loads sufficiently to allow a 10% rotor extension and reduce COE by 6.3%.

Olsen, T.; Lang, E.; Hansen, A.C.; Cheney, M. C.; Quandt, G.; VandenBosche, J.; Meyer, T.

2004-12-01T23:59:59.000Z

492

High temperature turbine engine structure  

DOE Patents (OSTI)

A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

1992-01-01T23:59:59.000Z

493

High temperature turbine engine structure  

DOE Patents (OSTI)

A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

1993-01-01T23:59:59.000Z

494

High temperature turbine engine structure  

DOE Patents (OSTI)

A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

1994-01-01T23:59:59.000Z

495

ENERGY & UTILITIES ORNL-1895 A Novel Method for Improving Flux ...  

benefit from the proposed method, including power cables, fault-current limiters, transformers, MRI machines, and rotor coils. Stage of Development: ...

496

Motor/generator  

DOE Patents (OSTI)

A motor/generator is provided for connecting between a transmission input shaft and an output shaft of a prime mover. The motor/generator may include a motor/generator housing, a stator mounted to the motor/generator housing, a rotor mounted at least partially within the motor/generator housing and rotatable about a rotor rotation axis, and a transmission-shaft coupler drivingly coupled to the rotor. The transmission-shaft coupler may include a clamp, which may include a base attached to the rotor and a plurality of adjustable jaws.

Hickam, Christopher Dale (Glasford, IL)

2008-05-13T23:59:59.000Z

497

Passive magnetic bearing for a motor-generator - Energy ...  

Conductive lap windings are interleaved with conventional loops in the stator of a motor-generator. The rotor provides magnetic induction lines that, when rotated ...

498

Fixture for aligning motor assembly - Energy Innovation Portal  

An alignment fixture includes a rotor fixture, a stator fixture and a sensor system which measures a rotational displacement therebetween. The fixture precisely ...

499

Microsoft Word - steamqrly.doc  

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

Computer Simulation of Heat Transfer of Large IP Rotor Forging and evaluated cracking susceptibility for various ingot cooling rates Prepared an extensive Spread Sheet Of...

500

YearFounded 2005 | Open Energy Information  

Open Energy Info (EERE)

+ ElectraTherm, Inc. + Ener-G-Rotors, Inc. + Enviro Energy Enterprises + EverSealed Windows, Inc. + Gaia Worldwide + NGP Energy Technology Partners + NovaTorque + Prism Solar...