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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

Aerodynamik des Rotors  

Science Journals Connector (OSTI)

Der Rotor steht am Anfang der Wirkungskette einer Windkraftanlage. Seine aerodynamischen und dynamischen Eigenschaften sind deshalb in mehrfacher Hinsicht prägend für das gesamte System. Die Fähigkeit des Roto...

Dipl.-Ing. Erich Hau

2003-01-01T23:59:59.000Z

4

Aerodynamik des Rotors  

Science Journals Connector (OSTI)

Der Rotor steht am Anfang der Wirkungskette einer Windkraftanlage. Seine aerodynamischen und dynamischen Eigenschaften sind deshalb in mehrfacher Hinsicht prägend für das gesamte System. Die Fähigkeit des Roto...

2008-01-01T23:59:59.000Z

5

Polygonal shaft hole rotor  

DOE Patents [OSTI]

A laminated rotor for an induction motor has a plurality of ferro-magnetic laminations mounted axially on a rotor shaft. Each of the plurality of laminations has a central aperture in the shape of a polygon with sides of equal length. The laminations are alternatingly rotated 180.degree. from one another so that the straight sides of the polygon shaped apertures are misaligned. As a circular rotor shaft is press fit into a stack of laminations, the point of maximum interference occurs at the midpoints of the sides of the polygon (i.e., at the smallest radius of the central apertures of the laminations). Because the laminates are alternatingly rotated, the laminate material at the points of maximum interference yields relatively easily into the vertices (i.e., the greatest radius of the central aperture) of the polygonal central aperture of the next lamination as the shaft is inserted into the stack of laminations. Because of this yielding process, the amount of force required to insert the shaft is reduced, and a tighter fit is achieved.

Hussey, John H. (St. Louis, MO); Rose, John Scott (Alton, IL); Meystrik, Jeffrey J. (Webster Groves, MO); White, Kent Lee (Maryland Heights, MO)

2001-01-23T23:59:59.000Z

6

Single rotor turbine engine  

DOE Patents [OSTI]

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

7

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

8

Sandia National Laboratories: National Rotor Testbed  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

National Rotor Testbed (NRT) includes research to quantify the degree to which the blade design load distribution influences the rotor near- and mid-wake velocity deficits and...

9

Sandia National Laboratories: National Rotor Testbed Functional...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

"Definition of the National Rotor Testbed: An Aeroelastically Relevant Research-Scale Wind Turbine Rotor." Approximately 60 researchers from various institutions and countries...

10

SMART Wind Turbine Rotor: Design and Field Test  

Broader source: Energy.gov [DOE]

Design and field test results from the SMART Rotor project, a wind turbine rotor with integrated trailing-edge flaps designed for active control of the rotor aerodynamics.

11

SMART Wind Turbine Rotor: Data Analysis and Conclusions  

Broader source: Energy.gov [DOE]

Data analysis and conclusions from the SMART Rotor project, a wind turbine rotor with integrated trailing-edge flaps designed for active control of the rotor aerodynamics.

12

A novel rotor position estimation approach for an 8/6 solid rotor switched reluctance motor  

Science Journals Connector (OSTI)

Switched reluctance motor (SRM) is becoming popular due to its simple construction, low manufacturing cost, ruggedness and fault-tolerant capability. In conventional switched reluctance motor (SRM), rotor is laminated. But in solid rotor switched reluctance ... Keywords: Artificial neural network, Rotor position estimation, Solid rotor switched reluctance motor, Two-phase excitation

L. Jessi Sahaya Shanthi; R. Arumugam; Y. K. Taly

2012-04-01T23:59:59.000Z

13

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

14

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

15

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.

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

16

Radial-Radial Single Rotor Turbine  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (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.

17

SMART Wind Turbine Rotor: Design and Field Test | Department...  

Energy Savers [EERE]

Design and Field Test SMART Wind Turbine Rotor: Design and Field Test This report documents the design, fabrication, and testing of the SMART Wind Turbine Rotor. This work...

18

Sandia National Laboratories: The Influence of Rotor Blade Design...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

National Rotor Testbed (NRT) includes research to quantify the degree to which the blade design load distribution influences the rotor near- and mid-wake velocity deficits and...

19

Substantially parallel flux uncluttered rotor machines  

DOE Patents [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

20

Acoustic modulation effect of rotating stator/rotor interaction noise  

E-Print Network [OSTI]

order, B(k) is the number of rotor blades, (k) is the angular velocity of the rotor, (l) is the angular on the rotor blades and on the fixed parts. According to the Ffowcs-Williams and Hawk- ings analogy comes from the periodic forces on the rotor blades and the forces on the other static parts of the fan

Boyer, Edmond

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

Safety Warnings Quad Rotors (Quad-Pilot 2 F.3)  

E-Print Network [OSTI]

Safety Warnings Quad Rotors (Quad-Pilot 2 F.3) The quad rotor "quad-pilot 2 F.3" is a complicated accidents from taking place. Operation of the quad rotor should be performed in a safe and responsible not accept any liability for damage and consequent damage arising from the use of the quad rotors, as we have

Langendoen, Koen

22

Interlayer toughening of fiber composite flywheel rotors  

SciTech Connect (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

23

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

24

Turbine bearings and rotor dynamics workshop: proceedings  

SciTech Connect (OSTI)

An EPRI workshop to address turbine bearing reliability improvement and rotor dynamics was co-hosted by Detroit Edison in Dearborn, Michigan on September 8-10, 1982. The 136 attendees represented a broad spectrum of US utilities, equipment manufacturers, and consultants, as well as representatives from England, Japan, and Switzerland. These proceedings contain the text of the formal presentations as well as summaries of the working group sessions which were devoted to topics of particular interest to the workshop participants. Formal presentations were organized under the following general session titles: utility experience and advancements in turbine bearing and lubrication systems; recent advancements in turbine bearing and lubrication systems; utility experience and advancements in turbine-generator rotor dynamics; and recent advancements in turbine-generator rotor dynamics. In addition to the technical presentations, working group sessions were held on selected topics relevant to turbine bearing reliability improvement and rotor dynamics. These groups provided a forum for engineers to exchange ideas and information in a less formal environment. The discussions provided attendees with an opportunity to discuss key issues in more detail and address subjects not covered in the formal presentations. The subjects of these working groups were: rotor dynamic analysis and problem solving; vibration signature analysis and field balancing; oil contamination monitoring and control; and operation and maintenance practices. Individual papers have been entered individually into EDB and ERA.

Brown, R.G.; Quilliam, J.F. (eds.)

1985-06-01T23:59:59.000Z

25

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.

26

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

27

INTRODUCTION 1.1 Aerodynamics of Rotors in Forward Flight  

E-Print Network [OSTI]

1 CHAPTER I INTRODUCTION 1.1 Aerodynamics of Rotors in Forward Flight The prediction of rotor blade aerodynamic loads, especially in forward flight, requires accurate and efficient modeling of several distinct to the nonlinear interaction between the rotor aerodynamics, trim, aeroelasticity and blade dynamics. As stated

28

Texas Fluid Dynamics Meeting, 2013 STABILITY OF ROTOR WAKES.  

E-Print Network [OSTI]

et al.(2000) [1] did eigenvalue stability analysis on multi-bladed helicopter rotor wakes and found, of multi-bladed helicopter rotor wake. Despite various analytical, numerical and flow visualiza- tion-scale four- bladed helicopter rotor in hover [6,7], revealed some impor- tant observations. Investigations

Tinney, Charles E.

29

Modeling of a rotor speed transient response with radial rubbing  

E-Print Network [OSTI]

by an accidental blade­off imbalance. In order to assess the angular deceleration of the rotor due to rubbingModeling of a rotor speed transient response with radial rubbing Sébastien Roques1 Institut deGill Univer- sity, 817 Sherbrooke St West, Montreal, Quebec H3A 2K6, Canada Abstract A rotor­stator model

Boyer, Edmond

30

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...

Aue, J.; Fineran, B.

2005-01-01T23:59:59.000Z

31

TIP DESENSITIZATION OF AN AXIAL TURBINE ROTOR  

E-Print Network [OSTI]

flow causes total pressure loss and significantly reduces turbine stage efficiency. Tip leakage relatedCC-63 TIP DESENSITIZATION OF AN AXIAL TURBINE ROTOR USING PARTIAL SQUEALER RIMS Debashis Dey1 of full and partial-length squealer rims in a turbine stage. Full and partial-length squealer rims

Camci, Cengiz

32

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

33

Dynamical Localization in Kicked Quantum Rotors  

E-Print Network [OSTI]

The periodically $\\delta$-kicked quantum linear rotor is known to experience non-classical bounded energy growth due to quantum dynamical localization in angular momentum space. We study the effect of random deviations of the kick period in simulations and experiments. This breaks the energy and angular momentum localization and increases the rotational alignment, which is the analog of the onset of Anderson localization in 1-D chains.

Kamalov, Andrei; Bucksbaum, Philip H

2015-01-01T23:59:59.000Z

34

Disc rotors with permanent magnets for brushless dc motor  

SciTech Connect (OSTI)

This patent describes a brushless dc permanent magnet motor for driving an autonomous underwater vehicle. It comprises first and second substantially flat, generally cylindrical stators disposed in side by side relation; a first substantially flat, generally cylindrical rotor; a first shaft connected to the first rotor and a second, concentric shaft connected to the second rotor; and means for providing rotation of the first and second shafts in opposite directions.

Hawsey, R.A.; Bailery, J.M.

1992-05-26T23:59:59.000Z

35

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

36

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

37

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

38

Adaptive rotor current control for wind-turbine driven DFIG using resonant controllers in a rotor rotating reference frame  

Science Journals Connector (OSTI)

This paper proposes an adaptive rotor current controller for doubly-fed induction generator (DFIG), which consists of a proportional (P...? slip+ and ? slip?..., respectively. As a...

Jia-bing Hu; Yi-kang He; Hong-sheng Wang

2008-02-01T23:59:59.000Z

39

E-Print Network 3.0 - aero-elasticity rotor aerodynamics Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: HVDC 12;Rotor aero-elastics and structural dynamics 12;Aerodynamics for wind turbines Flow over... and components Rotor aero-elastics and structural dynamics Grid...

40

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

Broader source: Energy.gov (indexed) [DOE]

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...

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

Vibration Control of Multi-Mode Rotor-Bearing Systems  

Science Journals Connector (OSTI)

8 March 1983 research-article Vibration Control of Multi-Mode Rotor-Bearing...least-squares method to minimize the vibration of any general rotor-bearing system...to implement the open-loop adaptive vibration control strategies outlined in the paper...

1983-01-01T23:59:59.000Z

42

Disc rotors with permanent magnets for brushless DC motor  

SciTech Connect (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

43

Department of Computer Engineering Spring 2010 Boeing Wind Tunnel Rotor Flight Simulator  

E-Print Network [OSTI]

PENNSTATE Department of Computer Engineering Spring 2010 Boeing Wind Tunnel Rotor Flight Simulator the construction of a wind tunnel rotor flight simulator. The program should allow the pilot to change the rotor and comfortable simulator with the following parts: A rotor controller, a wind tunnel controller, a graphical

Demirel, Melik C.

44

AIAA-982909 Characterization of the Near Wake of a Helicopter Rotor*  

E-Print Network [OSTI]

of Technology. Abstract Vortex characteristics in the near wake of a 2-bladed teetering rotor in steady forward to be repeatable to within 1° of rotor revolution. Velocity was measured in the planes intersected by the rotor-blade blade side of the rotor. The axial velocity in all cases is wake-like, being directed towards the blade

45

RESULTS AND DISCUSSION -Part I UH60A Rotor in High Speed Forward Flight  

E-Print Network [OSTI]

rotor for a number of hover and forward flight conditions. This rotor is a four-bladed configuration.2: Geometric Twist Distribution for the UH-60A Rotor In the experiment, the blades were trimmed to eliminate the one-per-rev flapping. The rotor blade sectional twist including elastic deformation is available

46

Reference Model 2: %22Rev 0%22 Rotor Design.  

SciTech Connect (OSTI)

The preliminary design for a three-bladed cross-flow rotor for a reference marine hydrokinetic turbine is presented. A rotor performance design code is described, along with modifications to the code to allow prediction of blade support strut drag as well as interference between two counter-rotating rotors. The rotor is designed to operate in a reference site corresponding to a riverine environment. Basic rotor performance and rigid-body loads calculations are performed to size the rotor elements and select the operating speed range. The preliminary design is verified with a simple finite element model that provides estimates of bending stresses during operation. A concept for joining the blades and support struts is developed and analyzed with a separate finite element analysis. Rotor mass, production costs, and annual energy capture are estimated in order to allow calculations of system cost-of-energy. Evaluation Only. Created with Aspose.Pdf.Kit. Copyright 2002-2011 Aspose Pty Ltd Evaluation Only. Created with Aspose.Pdf.Kit. Copyright 2002-2011 Aspose Pty Ltd

Barone, Matthew F.; Berg, Jonathan Charles; Griffith, Daniel

2011-12-01T23:59:59.000Z

47

Research on a novel Rotor Structure Switched Reluctance Motor  

Science Journals Connector (OSTI)

The paper proposes a novel switched reluctance motor with improved rotor structure, in which the segment core is embedded in aluminum rotor block in order to increase the mechanical strength and easy manufacturing as well as to improve the performance characteristics and reduce the vibration and acoustic noise. The effect of design parameters on the average torque is investigated using the finite element method. Comparison with conventional VR type SRM and segment type SRM without conductive metal construction rotor show the proposed novel SRM has advantages in the torque performances and the vibration and noise characteristics. The performance is also investigated by experiment.

Lingquan Zeng; Haiwei Yu

2012-01-01T23:59:59.000Z

48

The 5-megawatt power plant with 126 metre rotor diameter  

E-Print Network [OSTI]

The 5-megawatt power plant with 126 metre rotor diameter #12;Design data Rated power 5,000kW Cut-in speed 3.5m/s Rated wind speed 13.0m/s Cut-out speed 25.0m/s onshore 30.0m/s offshore Wind zone up to DIBt 3 Type class up to IEC Ib / GL offshore type class I Rotor Diameter 126.0m Rotor area 12,469m2

Firestone, Jeremy

49

Rotational Correlation Function of Spherical Rotors and Neutron Scattering  

Science Journals Connector (OSTI)

......Function of Spherical Rotors and Neutron Scattering Juichiro Hama Tuto Nakamura...Correlation Effect on the Slow Neutron Scattering by Polyatomic Molecules with...A. , Kowalska A. Thermal Neutron Scattering-Egelstaff P. A., ed......

Juichiro Hama; Tuto Nakamura

1971-12-01T23:59:59.000Z

50

Lean implementation across value stream in main rotor blade area  

E-Print Network [OSTI]

The primary goal for this project was to help expand the existing capability of Sikorsky's main rotor blade business from raw material (titanium) through final assembly. The project helped to facilitate the ongoing lean ...

Phoenix, Casey J. (Casey John)

2007-01-01T23:59:59.000Z

51

Motor Using High Temperature Superconductor as a Rotor  

Science Journals Connector (OSTI)

It is found that a high temperature superconductor rotates in the rotating magnetic field at ... authors and a small motor is made using high temperature superconductor as a rotor. This motor rotates at...

Makoto Takenaka; Masaharu Minami; Kazuo Morimoto

1994-01-01T23:59:59.000Z

52

Optimization of cylindrical composite flywheel rotors for energy storage  

Science Journals Connector (OSTI)

We hope that our efforts will contribute towards the design of flywheel rotors that have higher energy densities and ... that this can contribute to a future electricity grid that can accommodate renewable energy...

Petrus J. Janse van Rensburg…

2013-01-01T23:59:59.000Z

53

Effect of a straight teeth-on-rotor labyrinth seal on rotordynamics  

E-Print Network [OSTI]

of the stiffness and STATOR AIR FLOW ROTOR STATOR Teeth-on-Stator Seal Teeth-on-Rotor Seal Figure 2. Two Types of Labyrinth Seal Configurations Figure 3. Teeth-on-Rotor Labyrinth Seal Figure 4. Teeth-on-Rotor Labyrinth Seals Installed on Rotor damping... of the test rig is shown in Figure 6. Sea 2 Eddy Probes al 90 (Plane 1) Rotor 0 0 0 0 0 0 0 0 0 0 2 Eddy Probes at 90' (Plans 3) Anti-swirl Vane ? Flywheel 0-Rings 0-Ring 3 Compressed Air Cannon)iona 120' Apart Labyrinth Seal Area Seal...

Zierer, Joseph John

2012-06-07T23:59:59.000Z

54

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

SciTech Connect (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

55

Hi-Q Rotor - Low Wind Speed Technology  

SciTech Connect (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

56

Imbalance response of a rigid rotor supported on end sealed integral squeeze film dampers  

E-Print Network [OSTI]

-up*' the bearings and produce large oibits at the midspan of the flexible rotor San Andres and Lubell (1997) perform experiments in a three-disk rigid rotor supported on conventional open ended SFDs, and report damping force coefiicients estimated from..., rendering nearly uniform damping coefficients for rotor orbit motions up to 50'/o of the clearance. The tests show the absence of any rotor jump phenomena. San Andrds and Lubell stress the importance of an adequate identification of the structural damping...

De Santiago Duran, Oscar Cesar

2012-06-07T23:59:59.000Z

57

Physical bases for the design of highly efficient rotors in centrifugal pumps  

Science Journals Connector (OSTI)

1. Existing notions concerning optimum (less than 40°) angles of blade inclination in the rotors of centrifugal ...

P. R. Khlopenkov

1979-07-01T23:59:59.000Z

58

Phase modulated rotor angle encoder for switched reluctance motor drive  

E-Print Network [OSTI]

sensor. In an inexpensive systein, the rotor position sensor comprises of a magnetized ring along with Hall etfect sensors or opto-interrupters with slotted clisk. An optical sensor has a, light emitting diode which acts as a light transmitter, enid a... sensor. In an inexpensive systein, the rotor position sensor comprises of a magnetized ring along with Hall etfect sensors or opto-interrupters with slotted clisk. An optical sensor has a, light emitting diode which acts as a light transmitter, enid a...

Mahajan, Shailendra

2012-06-07T23:59:59.000Z

59

Vibration analysis of rotor systems using reduced subsystem models  

E-Print Network [OSTI]

the relative motion between the rotor and housing. A detailed analysis of this hydrodynamic coupling force is given in Ref. 1B to 20. Aerodynamic cross-coupling forces are developed when the fluid flows through blades causing a back-flow phenomenon...] is the diagonal matrix of assumed modal damping ratios. In case there are only the coupling forces (FC) at the connecting points to the rotor, the 3l transposed modal matrix [ASS] in equation (44) can 1T further be reduced to sub-matrices corresponding...

Fan, Uei-Jiun

1985-01-01T23:59:59.000Z

60

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

E-Print Network [OSTI]

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

Boyer, Edmond

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

American Institute of Aeronautics Astronautics DEVELOPMENT OF UNSTEADINESS IN A ROTOR WAKE  

E-Print Network [OSTI]

- speed forward flight (or cross-wind), where the wake is swept behind the rotor, the effect of ground1 American Institute of Aeronautics Astronautics DEVELOPMENT OF UNSTEADINESS IN A ROTOR WAKE Georgia Institute of Technology Atlanta, GA 30332-0150 ABSTRACT The flow field around the rotor in ground

62

LOSS OF ROTOR ISOTROPY AS A BLADE DAMAGE INDICATOR FOR WIND TURBINE STRUCTURE HEALTH MONITORING SYSTEMS  

E-Print Network [OSTI]

LOSS OF ROTOR ISOTROPY AS A BLADE DAMAGE INDICATOR FOR WIND TURBINE STRUCTURE HEALTH MONITORING to simulated vibrations of a rotating rotor. KEYWORDS : wind turbine blade, rotor anisotropy, Floquet analysis, OMA INTRODUCTION Blades of modern wind turbines are complex high-tech structures, and their cost

Paris-Sud XI, Université de

63

BASIC CONTROL FOR FOUR ROTOR AUTONOMOUS AERIAL AGENT JONATHAN MCLEAN, CONNECTICUT COLLEGE, USA,  

E-Print Network [OSTI]

more difficult to control, requiring minute adjustments to individual rotor blades, as well as tailBASIC CONTROL FOR FOUR ROTOR AUTONOMOUS AERIAL AGENT JONATHAN MCLEAN, CONNECTICUT COLLEGE, USA platform is required. Our four-rotor platform provides researchers with a inexpensive, fully scalable test

Parker, Gary B.

64

Reduction of multi-stage disk models: Application to an industrial rotor  

E-Print Network [OSTI]

of the rotor into sectors. The bladed disks are coupled by intermediate rings which remove the problem that of a small portion, typically a bladed sector. This configuration no longer holds in real rotors due with multi-stage rotors. However, as underlined by Bladh et al.6 , the critical point is the choice

Boyer, Edmond

65

RESULTS AND DISCUSSION Part II AH-1G ROTOR IN LOW SPEED DESCENT FLIGHT  

E-Print Network [OSTI]

, results are presented for a two-bladed AH-1G rotor in a low-speed descent condition. In low speed forward and Acoustics Test (TAAT) was conducted on an AH-1G Cobra. It used highly instrumented rotor blades direction. The inner Navier-Stokes zone includes about 39% of the total grid points. The rotor has

66

Magnetic induction of low-carbon steel for generator rotors  

Science Journals Connector (OSTI)

Steels containing 0.11–0.17% C and 4.5–4.6% Ni have higher magnetic induction than steels 25KhN3MFA and 35KhN3MFA which at present are used for generator rotors.

O. V. Filimonova; I. A. Borisov; A. M. Shkatova…

1989-06-01T23:59:59.000Z

67

Offshore Series Wind Turbine Variable Hub heights & rotor diameters  

E-Print Network [OSTI]

3.6MW Offshore Series Wind Turbine GE Energy #12;Feature Variable Hub heights & rotor diameters-savings feature, considering the rigors of offshore power generation. The 3.6 MW offshore wind turbine also, for both on and offshore use. Special features include... As the world's first commercially available wind

Firestone, Jeremy

68

Single Molecular Rotor at the Nanoscale Christian Joachim1  

E-Print Network [OSTI]

�schlikon, Switzerland E-mail: gim@zurich.ibm.com The design of a monomolecular engine such as a rotating motor ®rst requires the preparation of a semi-classical rotating motion of the rotor part of the engine. We show versions of machines in our daily life, using the same working principles such as, for instance, a steam

Gimzewski, James

69

SUPERVISORY ADAPTIVE BALANCING OF RIGID ROTORS DURING ACCELERATION  

E-Print Network [OSTI]

machining spindles, industrial turbomachinery, and aircraft gas turbine engines, are very commonly used strategy is proposed to coordinate the parameter estimation and the balancer control action. Simulation acceleration transient time will be developed based on a rigid rotor model. The actuator used in this research

Zhou, Shiyu

70

Performance of twist-coupled blades on variable speed rotors  

SciTech Connect (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

71

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:

72

Active Flow Control on Bidirectional Rotors for Tidal MHK Applications  

SciTech Connect (OSTI)

A marine and hydrokinetic (MHK) tidal turbine extracts energy from tidal currents, providing clean, sustainable electricity generation. In general, all MHK conversion technologies are confronted with significant operational hurdles, resulting in both increased capital and operations and maintenance (O&M) costs. To counter these high costs while maintaining reliability, MHK turbine designs can be simplified. Prior study found that a tidal turbine could be cost-effectively simplified by removing blade pitch and rotor/nacelle yaw. Its rotor would run in one direction during ebb and then reverse direction when the current switched to flood. We dubbed such a turbine a bidirectional rotor tidal turbine (BRTT). The bidirectional hydrofoils of a BRTT are less efficient than conventional hydrofoils and capture less energy, but the elimination of the pitch and yaw systems were estimated to reduce levelized cost of energy by 7.8%-9.6%. In this study, we investigated two mechanisms for recapturing some of the performance shortfall of the BRTT. First, we developed a novel set of hydrofoils, designated the yy series, for BRTT application. Second, we investigated the use of active flow control via microtabs. Microtabs are small deployable/retractable tabs, typically located near the leading or trailing edge of an air/hydrofoil with height on the order of the boundary layer thickness (1% - 2% of chord). They deploy approximately perpendicularly to the foil surface and, like gurney flaps and plain flaps, globally affect the aerodynamics of the airfoil. By strategically placing microtabs and selectively deploying them based on the direction of the inflow, performance of a BRTT rotor can be improved while retaining bidirectional operation. The yy foils were computationally designed and analyzed. They exhibited better performance than the baseline bidirectional foil, the ellipse. For example, the yyb07cn-180 had 14.7% higher (l/d)max than an ellipse of equal thickness. The yyb07cn family also had higher c{sub p,min} than equivalently thick ellipses, indicating less susceptibility to cavitation. Microtabs applied on yy foils demonstrated improved energy capture. A series of variable speed and constant speed rotors were developed with the yyb07cn family of hydrofoils. The constant speed yyb07cn rotor (yy-B02-Rcs,opt) captured 0.45% more energy than the equivalent rotor with ellipses (e-B02-Rcs,opt). With microtabs deployed (yy?t-B02-Rcs,opt), the energy capture increase over the rotor with ellipses was 1.05%. Note, however, that microtabs must be applied judiciously to bidirectional foils. On the 18% thick ellipse, performance decreased with the addition of microtabs. Details of hydrofoil performance, microtab sizing and positioning, rotor configurations, and revenue impacts are presented herein.

Shiu, Henry [Research Engineer; van Dam, Cornelis P. [Professor

2013-08-22T23:59:59.000Z

73

Adaptor assembly for coupling turbine blades to rotor disks  

DOE Patents [OSTI]

An adaptor assembly for coupling a blade root of a turbine blade to a root slot of a rotor disk is described. The adaptor assembly includes a turbine blade having a blade root and an adaptor body having an adaptor root. The adaptor body defines a slot having an open end configured to receive the blade root of the turbine blade such that the adaptor root of the adaptor body and the blade root of the turbine blade are adjacent to one another when the blade root of the turbine blade is positioned within the slot. Both the adaptor root of the adaptor body and the blade root of the turbine blade are configured to be received within the root slot of the rotor disk.

Garcia-Crespo, Andres Jose; Delvaux, John McConnell

2014-09-23T23:59:59.000Z

74

Embedded Real-Time Systems Electrical Model Quad Rotor UAV  

E-Print Network [OSTI]

Sys (2013-2014) #12;10 System SW view joystick QR PC link PC lift roll pitch yaw sensorsES joystickIn4073 Embedded Real-Time Systems Electrical Model Quad Rotor UAV #12;2 TE0300 FPGA System HW view), pitch rate (M), and yaw rate (N) (see qrsim for example!) x z y engine 4 engine 3 engine 2 engine 1 In

Langendoen, Koen

75

Investigation of Wind Turbine Rotor Concepts for Offshore Wind Farms  

Science Journals Connector (OSTI)

Current plans in offshore wind energy developments call for further reduction of cost of energy. In order to contribute to this goal, several wind turbine rotor concepts have been investigated. Assuming the future offshore wind turbines will operate only in the offshore wind farms, the rotor concepts are not only evaluated for their stand-alone performances and their potential in reducing the loads, but also for their performance in an offshore wind farm. In order to do that, the 10MW reference wind turbine designed in Innwind.EU project is chosen as baseline. Several rotor parameters have been modified and their influences are investigated for offshore wind turbine design purposes. This investigation is carried out as a conceptual parametrical study. All concepts are evaluated numerically with BOT (Blade optimisation tool) software in wind turbine level and with Farmflow software in wind farm level for two wind farm layouts. At the end, all these concepts are compared with each other in terms of their advantages and disadvantages.

Özlem Ceyhan; Francesco Grasso

2014-01-01T23:59:59.000Z

76

Investigation of rotor blade roughness effects on turbine performance  

SciTech Connect (OSTI)

The cold air test program was completed on the SSME (Space Shuttle Main Engine) HPFTP (High-Pressure Fuel Turbopump) turbine with production nozzle vane rings and polished coated rotor blades with a smooth surface finish of 30[mu]in. (0.76 [mu]m) rms (root mean square). The smooth blades were polished by an abrasive flow machining process. The test results were compared with the air test results from production rough-coated rotor blades with a surface finish of up to 400 [mu]in. (10.16 [mu]m) rms. Turbine efficiency was higher for the smooth blades over the entire range tested. Efficiency increased 2.1 percentage points at the SSME 104 percent RPL (Rated Power Level) conditions. This efficiency improvement could reduce the SSME HPFTP turbine inlet temperature by 57 R (32K), increasing turbine durability. The turbine flow parameter increased and the midspan outlet swirl angle became more axial with the smooth rotor blades.

Boynton, J.L.; Tabibzadeh, R. (Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Div.); Hudson, S.T. (NASA-Marshall Space Flight Center, Huntsville, AL (United States))

1993-07-01T23:59:59.000Z

77

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

SciTech Connect (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

78

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

Broader source: Energy.gov (indexed) [DOE]

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

79

Design Assessments of a Magnetic-geared Double-rotor Permanent Magnet Generator.  

E-Print Network [OSTI]

??The purpose of this research is to provide systematic design of a permanent magnet (PM) generator, by adopting the double-rotor and the coaxial magnetic gear… (more)

Chung, He-Yu

2013-01-01T23:59:59.000Z

80

E-Print Network 3.0 - adiabatic rotor model Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and simulation, both steady-state and transient, and rotor balancing of both subcritical and supercritical ... Source: Oak Ridge National Laboratory Fossil Energy Program...

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

E-Print Network 3.0 - asymmetric rotor model Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and simulation, both steady-state and transient, and rotor balancing of both subcritical and supercritical ... Source: Oak Ridge National Laboratory Fossil Energy Program...

82

Notes 05. Dynamics of a simple rotor-fluid film bearing system  

E-Print Network [OSTI]

?t e Static load u Rigid shaft Figure 5.1. Rigid rotor supported on journal bearings. (u) imbalance, (e) journal eccentricity Updated 09/04/09 ORIGIN 1:= rotor properties bearing 2MK rot DATA for rotor W T 500 lbf?:= Rotor weight Load per... cR? L? ? n ? ? n ? 60000?:= effective viscosity: deg-C (actual) ?_ n ? supply e ?? T eff n T supply ? () ? ?:= Journal Attitude angle ? n atan ? 1 ? n() 2 ?? 4 ? n ? ? ? ? ? ? ? 180 ? ?:= Calculations STATIC LOAD PERFORMANCE: journal cccentricity...

San Andres, Luis

2009-01-01T23:59:59.000Z

83

Toughness of Cr-Mo-V steels for steam-turbine rotors  

SciTech Connect (OSTI)

Cr-Mo-V steels are used extensively as the rotor material in the High Pressure and Intermediate Pressure Sections of modern steam turbines. The toughness of these rotors has a major influence on the reliability and efficiency of the turbine and the overall economy of operation and maintenance of the plant. The metallurgical factors affecting the toughness of the rotors and the methods to improve the toughness are now understood better than ever before. This paper will present a broad overview of the materials and design aspects of the toughness of Cr-Mo-V rotors with emphasis on the salient results of recent research programs aimed at improving their toughness.

Viswanathan, R.; Jaffee, R.I.

1982-04-01T23:59:59.000Z

84

Rotordynamic performance of a rotor supported on bump-type foil bearings: experiments and predictions  

E-Print Network [OSTI]

??????????...... 17 III-3 Test Rig for rotordynamic experiments of rotor supported on FBs???.. 19 III-4 Geometry of test rotor (0.98 kg, 2.12 lb)?????????????.. 20 III-5 Test rotor and test foil bearings for rotordynamic tests???????? 20 III-6 Miniature..., vertical plane (YFE)???????????????????? 48 IV-17 Waterfall plot of coastdown response for imbalance displacement u = 10.5 ?m (in phase, test A3). Air pressure at 34.4 kPa [5 psig] and measurements at rotor free end, vertical plane...

Rubio Tabares, Dario

2006-08-16T23:59:59.000Z

85

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

86

Numerical modeling of heat transfer and fluid flow in rotor-stator cavities with throughflow  

E-Print Network [OSTI]

Numerical modeling of heat transfer and fluid flow in rotor-stator cavities with throughflow S in a rotor-stator cavity subjected to a superimposed throughflow with heat transfer. Nu- merical predictions field from the heat transfer process. The turbulent flux is approximated by a gradient hypothesis

Boyer, Edmond

87

ISABE-2005-1214 Optimum Applications of Four-Port Wave Rotors for Gas Turbines Enhancement  

E-Print Network [OSTI]

1 ISABE-2005-1214 Optimum Applications of Four-Port Wave Rotors for Gas Turbines Enhancement Emmett investigations on wave rotor applications for gas turbines have been published, among them conceptual, analytical in the gas turbine industry. The results and conclusions are derived from a wide- range multi

Müller, Norbert

88

A complete and novel sensorless method for rotor position sensing in switched reluctance motor drives  

Science Journals Connector (OSTI)

This paper presents a complete and novel method which is designed to detect the rotor position at standstill and also low speeds in switched reluctance motor. The method applies a high frequency sine wave signal to the three successive stator pole windings ... Keywords: indirect rotor, position sensing in SRM, sensorless operation of SRM, switch reluctance motor

E. Afjei; M. M. Nezamabadi; A. Javeh

2005-07-01T23:59:59.000Z

89

H-G Diagram Based Rotor Parameters Identification for Induction Motors Thermal Monitoring  

E-Print Network [OSTI]

H-G Diagram Based Rotor Parameters Identification for Induction Motors Thermal Monitoring Mohamed: In this paper, an effective on-line method for induction motor parameter identification, especially rotor for each operating point. Computer simulations and experimental tests, carried out for a 4-kW four

Brest, Université de

90

RIS0-M-2432 SIMPLIFIED LAWS OF SIMIALRITY FOR WIND TURBINE ROTORS  

E-Print Network [OSTI]

comments are presented on comparison of stall-and pitch-regu- lated wind turbines and on two speed Shape factor (Weibull) Rotational speed Power Rotor radius Wind speed Rotor tip speed Tip speed ratio V is the wind speed at hub height, j> is the air density, #12;0 . 5 u ·p C

91

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

E-Print Network [OSTI]

.............................................................. 20 Typical base motion induced accelerations..................................... 20 Rotor speed coast down tests .......................................................... 22... ............................................................. 16 6 Photograph of connection of shaker to test rig base plate.......................... 17 7 Typical measured base acceleration in time domain. Shaker excitation frequency: 6 Hz. Rotor speed = 34 krpm (567 Hz...

Niu, Yaying

2010-01-14T23:59:59.000Z

92

RECENT ADVANCES IN SMART-MATERIAL ROTOR CONTROL ACTUATION. Victor Giurgiutiu*,  

E-Print Network [OSTI]

RECENT ADVANCES IN SMART-MATERIAL ROTOR CONTROL ACTUATION. Victor Giurgiutiu*, University of South achievements in the application of active-materials actuation to counteract aeroelastic and vibration effects and capabilities is done first. Attention is focused on the smart rotor-blade applications. The induced twist

Giurgiutiu, Victor

93

Planar velocity measurements in two rotorcraft flows are presented. The first is that of an isolated rotor  

E-Print Network [OSTI]

-light-based measurement system. The second flowfield is that of a rotor wake interacting with a fixed wing in a wind field. Isolated rotor in axial flight Substantial uncertainties remain in modeling the wake typical of a full-scale rotor wake. The clean periodicity of this flow allows capture of fundamental

94

VOL. 6, NO. 5, SEPT.-OCT. 1990 J. PROPULSION 621 Stator/Rotor Interaction in a Transonic Turbine  

E-Print Network [OSTI]

on the rotor blade, reflects upstream, and then reflects again off the stator blade Presented as Paper 88 and shows the large unsteadiness in the lift on the rotor blade. Basic NumericalMethod The flowfiVOL. 6, NO. 5, SEPT.-OCT. 1990 J. PROPULSION 621 Stator/Rotor Interaction in a Transonic Turbine

Giles, Mike

95

A rotor position estimator for switched reluctance motors using CMAC  

Science Journals Connector (OSTI)

This paper presents an approach to rotor position estimation in switched reluctance motors (SRMs) by using a cerebellum model articulation controller (CMAC). Previous research has shown that an artificial neural network (ANN) forms an efficient mapping structure through measurement of the flux linkages and currents for the phases. A CMAC is investigated in this paper in order to overcome the high computational power requirement problem that is encountered in a feedforward ANN based rotor position estimator. The CMAC structure does not contain neurons with activation functions, and all mathematical operations are performed without multiplication. These simplicities increase the throughput in real time implementation performed with conventional embedded controllers. However, the distributed memory structure of a CMAC requires more space. The issues involved in designing, training and implementing a CMAC are presented. In order to demonstrate the feasibility of the concept, a 20 kW, 6/4, three phase SRM is studied with training and evaluation data, which are obtained from a simulation program. A CMAC that is based on experimentally measured training and testing data for the same SRM is also used to demonstrate the promise of this approach.

Erkan Mese

2003-01-01T23:59:59.000Z

96

Assessment of research needs for wind turbine rotor materials technology  

SciTech Connect (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

97

Cooling system for a bearing of a turbine rotor  

DOE Patents [OSTI]

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

98

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

DOE Patents [OSTI]

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

99

Rotor dynamic analysis of multi-line systems using the polynomial transfer matrix method  

E-Print Network [OSTI]

COEFFICIENTS 66 APPENDIX 3 - PROGRAM TEST CASES 72 VITA 90 LIST OF FIGURES FIGURE Page 1 - Two Line Rotor Model and Station 10 2 ? X-Z Plane Sign Convention 12 3 - Y-Z Plane Sign Convention 4 ? Mass Station Transfer Matrix 5 ? Beam Station Transfer... inch Diameter Shaft Free-Free Case 75 3 - Three Disk Rotor Critical Speeds - No Foundations 76 4 - 3 Disk Rotor Natural Frequencies With Foundations 78 5 - 2 inch Shaft Model With Foundations 82 6 ? Roots Before Dividing Out Correction Polynomial 83...

Troxler, Paul Joseph

2012-06-07T23:59:59.000Z

100

Design trade-off study between efficiency and rotor forcing attenuation in a transonic turbine stage  

Science Journals Connector (OSTI)

Abstract A multi-objective optimisation procedure was applied to the 3D design of a transonic turbine vane row, considering efficiency and stator outlet pressure distortion, which is directly related to the forcing induced in the rotor. The characteristic features that define different individuals along the Pareto Front were described, analysing the differences between high efficiency airfoils and low interaction. Pressure distortion was assessed by means of a model that requires only of the computation the steady flow field in the domain of the stator. The reduction of aerodynamic rotor forcing was validated via unsteady multistage aerodynamic computations carried out with NUMECA FINE TM / Turbo . A well known loss prediction method was used to perform total loss decomposition to quantify the influence on efficiency of reducing rotor forcing. Results show that when striving for efficiency, the rotor was affected by few, but intense shocks. On the other hand, when the objective was the minimisation of distortion, multiple shocks appeared.

Ricardo Puente; Guillermo Paniagua; Tom Verstraete

2014-01-01T23:59:59.000Z

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

UPWIND, Aerodynamics and aero-elasticity Rotor aerodynamics in atmospheric shear flow  

E-Print Network [OSTI]

UPWIND, Aerodynamics and aero-elasticity Rotor aerodynamics in atmospheric shear flow Niels N codes for wind turbines utilize aerodynamics based on BEM methods, see [1, 2]. For modern large scale

102

Study on Rotor-Side Converter of Doubly Fed Induction Generator  

Science Journals Connector (OSTI)

The doubly fed induction generator has been widely used in wind power ... power from the wind energer. But the generator speed changes, the output frequency will chang ... alter rotor excitation current, to maint...

Haihui Song; Tian De

2012-01-01T23:59:59.000Z

103

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...

Zutavern, Zachary Scott

2009-06-02T23:59:59.000Z

104

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

SciTech Connect (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

105

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...

Parthasarathy, Nikhil Kaushik

2004-09-30T23:59:59.000Z

106

Spin-rotor Interpretation of Identical Bands and Quantized Alignment in Superdeformed A $\\approx$ 190 Nuclei  

E-Print Network [OSTI]

The ``identical'' bands in superdeformed mercury, thallium, and lead nuclei are interpreted as examples of orbital angular momentum rotors with the weak spin-orbit coupling of pseudo-$SU(3)$ symmetries and supersymmetries.

J. A. Cizewski; R. Bijker

1995-06-02T23:59:59.000Z

107

A study of chaos in a rotor system supported by ball bearings  

E-Print Network [OSTI]

. Numerous researchers have published a myriad of papers on the application of chaos theory to mechanical, electrical and biological systems. However, control theories of chaos have been in existence for only a decade and have not been applied to rotor...

Ortiz, Steven Rey

2013-02-22T23:59:59.000Z

108

Effect of Cooling Flow on the Operation of a Hot Rotor-Gas Foil Bearing System  

E-Print Network [OSTI]

Gas foil bearings (GFBs) operating at high temperature rely on thermal management procedures that supply needed cooling flow streams to keep the bearing and rotor from overheating. Poor thermal management not only makes systems inefficient...

Ryu, Keun

2012-02-14T23:59:59.000Z

109

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

110

An embedded controller for quad-rotor flying robots running distributed algorithms  

E-Print Network [OSTI]

Multiple collaborating quad-rotor flying robots are useful in a broad range of applications, from surveillance with onboard cameras to reconfiguration of wireless networks. For these applications, it is often advantageous ...

Julian, Brian John

2009-01-01T23:59:59.000Z

111

Molecular dynamics of a grid-mounted molecular dipolar rotor in a rotating electric field  

Science Journals Connector (OSTI)

...interesting. Analyses (23–25) of a one-dimensional string of rotors interacting by electrostatic forces suggest...consisting of two concentric carbon nanotubes in a linearly oscillating electric field. Our work differs in several respects...

Jaroslav Vacek; Josef Michl

2001-01-01T23:59:59.000Z

112

How to improve open rotor aerodynamics at cruise and take-off  

E-Print Network [OSTI]

1 Copyright © 2014 University of Cambridge DRAFT – HOW TO IMPROVE OPEN ROTOR AERODYNAMICS AT CRUISE AND TAKE-OFF Cesare Hall, Alexios Zachariadis, Tobias Brandvik, Nishad Sohoni cah1003@cam.ac.uk University of Cambridge, Whittle... Laboratory 1 JJ Thomson Avenue, Cambridge CB3 0DY ABSTRACT A key challenge in open rotor design is getting the optimum aerodynamics at both the cruise and take-off conditions. This is particularly difficult because the operation and the requirements...

Hall, Cesare; Zachariadis, Alexios; Brandvik, Tobias; Sohoni, Nishad

113

Measurements of imbalance response for a rigid rotor fully supported on squeeze film dampers  

E-Print Network [OSTI]

MEASUREMENTS OF IMBALANCE RESPONSE FOR A RIGID ROTOR FULLY SUPPORTED ON SQUEEZE FILM DAMPERS A Thesis by DANIEL ROGER LUBELL Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 2000 Major Subject: Mechanical Engineering MEASUREMENTS OF IMBALANCE RESPONSE FORA RIGID ROTOR FULLY SUPPORTED ON SQUEEZE FILM DAMPERS by DANIEL ROGER LUBELL Submitted to Texas AlbM University in partial...

Lubell, Daniel Roger

2012-06-07T23:59:59.000Z

114

Genetic icing effects on forward flight performance of a model helicopter rotor  

E-Print Network [OSTI]

GENERIC ICING EFFECTS ON FORWARD FLIGHT PERFORMANCE OF A MODEL HELICOPTER ROTOR A Thesis ANA FIORELLA TINETTI-SANCHEZ Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE December 1987 Major Subject: Aerospace Engineering GENERIC ICING EFFECTS ON FORWARD FLIGHT PERFORMANCE OF A MODEL HELICOPTER ROTOR A Thesis by ANA FIORELLA TINETTI-SANCHEZ Approved as to style and content by: Kenneth D. Korkan...

Tinetti-Sanchez, Ana Fiorella

2012-06-07T23:59:59.000Z

115

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

116

The axial gas-dynamic forces acting on the rotor of a small gas-turbine engine  

Science Journals Connector (OSTI)

The exact determination is discussed of the axial gas-dynamic forces acting on the rotor of a gas-turbine engine (GTE), which influence reliability....

S. S. Evgen’ev; R. R. Zalyaev

2007-03-01T23:59:59.000Z

117

Operation of a test bed axial-gap brushless dc rotor with a superconducting stator  

SciTech Connect (OSTI)

A variable-speed axial-gap motor with a stator consisting of four liquid helium cooled superconducting electromagnets (two pole pairs) was built and proof tested up to 608 rpm in November 1990 as a tool for joint industry-laboratory evaluation of coils fabricated from high-temperature oxide superconductors. A second rotor was fabricated with improved materia winding configuration, and wire type, and the drive system was modified to eliminate current spiking. The modified motor was characterized to design speed, 188 rad/s (1800 rpm), to acquire a performance baseline for future comparison with that of high-temperature superconducting (HIS) wire. As it becomes commercially available, HTS wire will replace the low-temperature electromagnet wire in a stator modified to control wire temperatures between 4 K and 77 K. Measurements of the superconducting electromagnetic field and locked rotor torque as functions of cryocurrent and dc current through two phases of the rotor, respectively, provided data to estimate power that could be developed by the rotor. Back emf and parasitic mechanical and electromagnetic drag torques were measured as functions of angular velocity to calculate actual rotor power developed and to quantify losses, which reduce the motor`s efficiency. A detailed measurement of motor power at design speed confirmed the developed power equation. When subsequently operated at the 33-A maximum available rotor current, the motor delivered 15.3 kill (20.5 hp) to the load. In a final test, the cryostat was operated at 2500 A, 200 A below its critical current. At rotor design current of 60 A and 2500 A stator current, the extrapolated developed power would be 44.2 kill (59.2 hp) with 94% efficiency.

McKeever, J.W.; Sohns, C.W.; Schwenterly, S.W.; Young, R.W. Sr.; Campbell, V.W.; Hickey, M.H.; Ott, G.W. [Oak Ridge National Lab., TN (United States); Bailey, J.M. [Tennessee Univ., Knoxville, TN (United States)

1993-08-01T23:59:59.000Z

118

Vibration based damage detection of rotor blades in a gas turbine engine  

Science Journals Connector (OSTI)

Abstract This paper describes the problems concerning turbine rotor blade vibration that seriously impact the structural integrity of a developmental aero gas turbine. Experimental determination of vibration characteristics of rotor blades in an engine is very important from fatigue failure considerations. The blades under investigation are fabricated from nickel base super alloy through directionally solidified investment casting process. The blade surfaces are coated with platinum aluminide for oxidation protection. A three dimensional finite element modal analysis on a bladed disk was performed to know the likely blade resonances for a particular design in the speed range of operation. Experiments were conducted to assess vibration characteristics of bladed disk rotor during engine tests. Rotor blade vibrations were measured using non-intrusive stress measurement system, an indirect method of blade vibration measurement utilizing blade tip timing technique. Abnormalities observed in the vibration characteristics of the blade tip timing data measured during engine tests were used to detect the blade damage. Upon disassembly of the engine and subsequent fluorescent penetrant inspection, it was observed that three blades of the rotor assembly were identified to have damaged. These are the blades that exhibited vibration abnormalities as a result of large resonant vibration response while engine tests. Further, fractographic analysis performed on the blades revealed the mechanism of blade failures as fatigue related. The root cause of blade failure is established to be high cycle fatigue from the engine run data history although the blades were put into service for just 6 h of engine operation.

S. Madhavan; Rajeev Jain; C. Sujatha; A.S. Sekhar

2014-01-01T23:59:59.000Z

119

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

Broader source: All U.S. Department of Energy (DOE) Office Webpages (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

120

Translational/rotational coupling of the hindered CH 3 quantum-rotor in lithium acetate dihydrate  

Science Journals Connector (OSTI)

The multiplet structure of the rotational-tunneling peaks in the inelastic neutron-scattering spectrum of lithium acetate is widely regarded as evidence of coupled pairs of CH 3 quantum rotors. However our molecular-mechanics study which has no adjustable parameters reveals that rotor/rotor coupling is less important than translational/rotational coupling. In order to remain at a potential-energy minimum during CH 3 group reorientation the center-of-mass of this group follows an almost circular path around its time-average position. The energy levels from this dynamical model reproduce the observed tunneling-transitions reasonably well and the predicted rectangular density distribution of the three methyl H-atoms is in good agreement with that measured by single-crystalneutron diffraction.

P. Schiebel; G. J. Kearley; M. R. Johnson

1998-01-01T23:59:59.000Z

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.


121

Scnarios d'interaction rotor/stator pour un compresseur haute pression d'un moteur d'hlicoptre  

E-Print Network [OSTI]

Scénarios d'interaction rotor/stator pour un compresseur haute pression d'un moteur d'hélicoptère A plus de prévoir les zones d'interaction. Rotor-stator interaction scenarios for the centrifugal in the centrifugal com- pressor of helicopter engines when structural contacts occur between the blade

Boyer, Edmond

122

Improved Structure and Fabrication of Large, High-Power KHPS Rotors - Final Scientific/Technical Report  

SciTech Connect (OSTI)

Verdant Power, Inc, working in partnership with the National Renewable Energy Laboratory (NREL), Sandia National Laboratories (SNL), and the University of Minnesota St. Anthony Falls Laboratory (SAFL), among other partners, used evolving Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) models and techniques to improve the structure and fabrication of large, high-power composite Kinetic Hydropower System (KHPS) rotor blades. The objectives of the project were to: design; analyze; develop for manufacture and fabricate; and thoroughly test, in the lab and at full scale in the water, the improved KHPS rotor blade.

Corren, Dean [Verdant Power, Inc.; Colby, Jonathan [Verdant Power, Inc.; Adonizio, Mary Ann [Verdant Power, Inc.

2013-01-29T23:59:59.000Z

123

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

Science Journals Connector (OSTI)

A protection scheme of a doubly fed induction generator (DFIG) based wind turbine system during faults is crowbar activation. With this protection the rotor side converter (RSC) is temporarily disconnected and its vector control over the stator active and reactive power is lost leading to poor power quality at the point of common coupling (PCC). This paper presents a new protection scheme for transient rotor current to improve the performance of DFIG during grid disturbance. The new scheme consisting of a crowbar and series circuit is connected between the rotor windings and RSC to enhance the low voltage ride-through capability of DFIG. The proposed scheme successfully limits the transient rotor current and dc-link voltage and a disconnection of RSC from the rotor windings is avoided during fault. Additionally RSC and grid-side converter controllers are modified to improve the voltage at PCC. Simulations on matlab/Simulink verify the effectiveness of the proposed scheme.

Jackson John Justo; Kyoung-Soo Ro

2012-01-01T23:59:59.000Z

124

To cite this document: Barbiero, Franck and Vincent, Franois and Deloues, Thierry and Letestu, Franck Effects of rotor blade modulation on GNSS anti-jamming algorithms.  

E-Print Network [OSTI]

, Franck Effects of rotor blade modulation on GNSS anti-jamming algorithms. (2014) In: ION International be sent to the repository administrator: staff-oatao@inp-toulouse.fr #12;Effects of rotor blade modulation rotating bodies, the signal undergo complex and non-stationary effects called Rotor Blade Modulation (RBM

Mailhes, Corinne

125

Modeling of residual service life of gas turbine rotors for minimizing replacement costs  

Science Journals Connector (OSTI)

One of the most catastrophic failures observed in gas turbine powered electrical powerplants is the fracture of the turbine rotor. A simplified model consisting of 3 macro-elements is suggested to model the dynamical behavior of the shaft with a propagating ... Keywords: crack propagation, gas-turbine, modeling, power-plant, replacement costs

Eusebia Zouridaki; Vasilios Spitas; Christos Spitas

2007-01-01T23:59:59.000Z

126

Experimental response of a rotor supported on Rayleigh step gas bearings  

E-Print Network [OSTI]

contact during start-up and shutdown. Quick lifting of the rotor in the air bearings reduces the wear and damage of solid surfaces for long durability of the bearings under cyclic start/stop operation. 6 Sastri et al. [27] study the tribological...

Zhu, Xuehua

2004-11-15T23:59:59.000Z

127

Toward a Better Understanding of Ducted Rotor Antitorque and Directional Control in Forward Flight  

E-Print Network [OSTI]

of the Core Automatic Flight Control System (CAFCS) mode. Figure 1 shows a sustained, large-amplitude 1-Hz yaw ABSTRACT Despite decades of very successful yaw-control and anti-torque applications, the aerodynamics dramatic. From a handling-qualities perspective, the ducted rotor provides the loads capacity required

128

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

SciTech Connect (OSTI)

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

129

Concurrent Aerodynamic Optimization of Rotor Blades Using a Nash Game Method  

E-Print Network [OSTI]

Concurrent Aerodynamic Optimization of Rotor Blades Using a Nash Game Method Enric Roca Le´on Ph Aerodynamics Leader, Airbus Helicopter, Marignane, France Michel Costes Research Engineer, ONERA, Meudon OF THE AMERICAN HELICOPTER SOCIETY Abstract A multi-objective strategy adapted to the aerodynamic concurrent

Paris-Sud XI, Université de

130

Contribution of restricted rotors to quantum sieving of hydrogen isotopes B. C. Hathorn,1  

E-Print Network [OSTI]

have come to the forefront as a possible storage medium for hydrogen for fuel-cell de- vices. A number of isotopically substituted hydrogen molecules adsorbed into single-walled car- bon nanotubes are calculated usingContribution of restricted rotors to quantum sieving of hydrogen isotopes B. C. Hathorn,1 B. G

Hathorn, Bryan C.

131

2010 Asia-Pacific International Symposium on Aerospace Technology Rotor-stator interaction broadband noise  

E-Print Network [OSTI]

2010 Asia-Pacific International Symposium on Aerospace Technology Rotor-stator interaction-dimensional annular cascade to the impinging harmonic distortions. Each upstream har- monic mode is defined by its and Horan[2] . The #12;· 2 · Igor Vinogradov/ Chinese Journal of Aeronatics typical energy distribution over

Huang, Xun

132

Rotor current transient analysis of DFIG-based wind turbines during symmetrical voltage faults  

Science Journals Connector (OSTI)

Abstract The impact of grid voltage fault on doubly fed induction generators (DFIGs), especially rotor currents, has received much attention. So, in this paper, the rotor currents of based-DFIG wind turbines are considered in a generalized way, which can be widely used to analyze the cases under different levels of voltage symmetrical faults. A direct method based on space vector is proposed to obtain an accurate expression of rotor currents as a function of time for symmetrical voltage faults in the power system. The presented theoretical analysis is simple and easy to understand and especially highlights the accuracy of the expression. Finally, the comparable simulations evaluate this analysis and show that the expression of the rotor currents is sufficient to calculate the maximum fault current, DC and AC components, and especially helps to understand the causes of the problem and as a result, contributes to adapt reasonable approaches to enhance the fault ride through (FRT) capability of DFIG wind turbines during a voltage fault.

Yu Ling; Xu Cai; Ningbo Wang

2013-01-01T23:59:59.000Z

133

Reduction of teeter angle excursions for a two-bladed downwind rotor using cyclic pitch control  

E-Print Network [OSTI]

Reduction of teeter angle excursions for a two-bladed downwind rotor using cyclic pitch control methods are based on cyclic pitch through the pitch servo system. The first method is based on a PI of the pitch regulated 5MW reference turbine used in the IEA Annex 23 benchmark. KEYWORDS: TWO-BLADED WIND

134

Waves of constant shape and the structure of the \\rotors boundary" in excitable media.  

E-Print Network [OSTI]

Waves of constant shape and the structure of the \\rotors boundary" in excitable media. Yu.E. Elkin wave patterns in R 2 , in terms of the kinematic approach. These patterns include rotating waves (diverging and converging spiral waves), and translating waves (retracting waves, \\critical #12;ngers" and \\V

Biktashev, Vadim N.

135

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

136

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

E-Print Network [OSTI]

and expansion waves to add or remove energy from a fluid flow. It has been proved that for modest pressure.g., number of ports and their positions) vary but a common feature of all wave rotors is an array of channels with straight channels. The drum rotates between two stationary end plates, each of which has a few ports

Müller, Norbert

137

Soft computing based optimum parameter design of PID controller in rotor speed control of wind turbines  

Science Journals Connector (OSTI)

Sensitivity and robustness is the primary issue while designing the controller for large non-linear systems such as offshore wind turbines. The main goal of this study is a novel soft computing based approach in controlling the rotor speed of wind turbine. ... Keywords: bacteria foraging optimization algorithm, optimization, particle swarm optimization, proportional-integral-derivative controller, wind turbines

R. Manikandan; Nilanjan Saha

2011-12-01T23:59:59.000Z

138

Magnetic bearings for automatic control system of electromagnetic suspension of rotors of turbo-group gas-turbine thermal stations  

Science Journals Connector (OSTI)

A brief overview of suspensions is given. The type of suspension for rotors of turbogenerators is chosen. An automatic control system is developed for an electromagnetic suspension of the radial and axial magn...

I. V. Zotov; V. G. Lisienko

2010-03-01T23:59:59.000Z

139

Risk assessment of turbine rotor failure using probabilistic ultrasonic non-destructive evaluations  

SciTech Connect (OSTI)

The study presents a method and application of risk assessment methodology for turbine rotor fatigue failure using probabilistic ultrasonic nondestructive evaluations. A rigorous probabilistic modeling for ultrasonic flaw sizing is developed by incorporating the model-assisted probability of detection, and the probability density function (PDF) of the actual flaw size is derived. Two general scenarios, namely the ultrasonic inspection with an identified flaw indication and the ultrasonic inspection without flaw indication, are considered in the derivation. To perform estimations for fatigue reliability and remaining useful life, uncertainties from ultrasonic flaw sizing and fatigue model parameters are systematically included and quantified. The model parameter PDF is estimated using Bayesian parameter estimation and actual fatigue testing data. The overall method is demonstrated using a realistic application of steam turbine rotor, and the risk analysis under given safety criteria is provided to support maintenance planning.

Guan, Xuefei; Zhang, Jingdan; Zhou, S. Kevin [Siemens Corporation, Corporate Technology, 755 College Rd. E., Princeton NJ 08540 (United States); Rasselkorde, El Mahjoub; Abbasi, Waheed A. [Siemens Energy Inc., 841 Old Frankstown Road, Pittsburgh PA 15239 (United States)

2014-02-18T23:59:59.000Z

140

A new 2D FEM analysis of a disc machine with offset rotor  

SciTech Connect (OSTI)

The paper presents a new 2-Dimensional Finite Element Method (2D FEM) analysis of a double sided axial field, permanent magnet excited brushless DC motor. The rotor of the machine is free to move in a direction perpendicular to the axis of the shaft. Computed 2D results are compared with 3D FEM analysis and the new analysis method is shown to give close agreement.

Gair, S.; Canova, A. [Napier Univ., Edinburgh (United Kingdom). Dept. of Electrical, Electronic and Computer Engineering; Eastham, J.F.; Betzer, T. [Univ. of Bath (United Kingdom). School of Electronic and Electrical Engineering

1995-12-31T23:59:59.000Z

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

Application of SAFER-PC program to determine turbine rotor boresonic inspection intervals  

SciTech Connect (OSTI)

Public Service Company of Colorado (PSCC) used EPRI`s SAFER-PC Program to evaluate their HP/IP, LP, and generator rotors from Cherokee Station Unit 3, to determine appropriate boresonic re-inspection intervals. The program uses fracture mechanics to calculate critical crack sizes, which could lead to catastrophic failure of the rotors. Conservative stress and fracture mechanics analyses showed negligible fatigue crack growth of assumed bore surface cracks would occur over the proposed inspection interval of eighteen years. The evaluation assumed consistent operational start-up procedures for the inspection interval. If the unit experiences more severe operational procedures, the analysis may not be applicable, with smaller critical crack sizes and accelerated crack growth rates expected. The SAFER-PC analysis resulted in an extension of the previously recommended reinspection interval by eight years. By eliminating just this one inspection, PSCC achieved savings in the range of $100,000. Further savings are anticipated by utilizing the SAFER-PC Program to evaluate these and other PSCC rotors in the future.

Sachse, D.G.; Hellner, R.L.; Dupont, E.J. [Public Service Co., Denver, CO (United States)

1996-12-31T23:59:59.000Z

142

Artificial neural network based torque calculation of switched reluctance motor without locking the rotor  

Science Journals Connector (OSTI)

Feedback of motor torque is required in most of switched reluctance (SR) motor applications in order to control torque and its ripple. An SR motor shows highly nonlinear property which does not allow calculating torque analytically. Torque can be directly measured by torque sensor but it inevitably increases the cost and has to be properly mounted on the motor shaft. Instead of torque sensor finite element analysis(FEA) may be employed for torque calculation. However motor modeling and calculation takes relatively long time. The results of FEA may also differ from the actual results. The most convenient way seems to calculate torque from the measured values of rotor position current and flux linkage while locking the rotor at definite positions. However this method needs an extra assembly to lock the rotor. In this study a novel torque calculation based on artificial neural networks (ANNs) is presented. Magnetizing data are collected while a 6/4 SR motor is running. They need to be interpolated for torque calculation. ANN is very strong tool for data interpolation. ANN based torque estimation is verified on the 6/4 SR motor and is compared by FEA based torque estimation to show its validity.

Fuat Kucuk; Hiroki Goto; Hai-Jiao Guo; Osamu Ichinokura

2009-01-01T23:59:59.000Z

143

Independent modal space control and modal filters for active vibration control of rotors  

E-Print Network [OSTI]

, as shown in equation (3. 7): ((t) = At(t) + Z(t) (3. 7) where Z is the modal force vector, and is given by: Z(t) = V BQ(t) = Vr M 'Q(t) (3 g) in which the right hand side of the equation results from the fact that only the lower n rows of the B matrix... gg Alan B. Pal o (Chair of Committee) James S. Noel (Member) Richard . Alexander (Member) Walter L. B ley (Head of Department) August 1992 ABSTRACT Independent Modal Space Control and Modal Filters for Active Vibration Control of Rotors...

Roever, Douglas Michael

2012-06-07T23:59:59.000Z

144

Design of outer-rotor-type multipolar switched reluctance motor for electric vehicle  

Science Journals Connector (OSTI)

In an electric vehicle(EV) with in-wheel motors reducing the weight of the motor is a very important problem in order to improve the driving performance. In this paper we examine the lightweight design of an outer-rotor-type multipolar switched reluctance (SR) motor applied to a prototype EV. We design three SR motors which have different yoke widths and calculate the motor characteristics at a steady rotational speed based on a finite element method. We discuss the optimum relationship between a pole and yoke widths.

Satoshi Fujishiro; Kazumi Ishikawa; Shinki Kikuchi; Kenji Nakamura; Osamu Ichinokura

2006-01-01T23:59:59.000Z

145

An experimental investigation of a tilt rotor aircraft wake in ground effect  

E-Print Network [OSTI]

: Sktlld dS t' 1, "~Et 18, 6 (1975), pp. 51-673. Hunt, J. C. R. , Poulton, E. C. , and Mumford, J. C. , "The Effects of Wldppl:Sd't*l Bd tldt lt*p*' t, "~Bi1di Environment, 11 (1976), pp. 15-28. 50 VITA gichael Louis Frey III was born January 4, 1957...EXPERIMENTAL INVESTIGATION OF A TILT ROTOR AIRCRAFT WAKE IN GROUND EFFECT A Thesis by MICHAEL LOUIS FREY III Submi. tted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER...

Frey, Michael Louis

1982-01-01T23:59:59.000Z

146

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

SciTech Connect (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

147

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]

of the rotor of a wind turbine and the rated power of a permanent magnet synchronous machine. This is made of the wind turbine, the gearbox's transformation ratio, the battery voltage and the wind speed probability's rated power and the wind turbine's rotor size. The system studied in this paper consists of 220 (V)/50

Paris-Sud XI, Université de

148

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

SciTech Connect (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

149

Rotor dynamic analysis of GCEP (Gas Centrifuge Enrichment Plant) Tails Withdrawal Test Facility AC-12 compressor  

SciTech Connect (OSTI)

The reliable operation of the centrifugal compressors utilized in the gaseous diffusion process is of great importance due to the critical function of these machines in product and tails withdrawal, cascade purge and evacuation processes, the purge cascade and product booster applications. The same compressors will be used in equally important applications within the Gas Centrifuge Enrichment Plant (GCEP). In response to concern over the excessive vibration exhibited by the AC-12 compressor in the No. 3 position of the GCEP Tails Withdrawal Test Facility, a rotor-bearing dynamic analysis was performed on the compressor. This analysis included the acquisition and reduction of compressor vibration data, characterization and modeling of the rotorbearing system, a computer dynamic study, and recommendations for machine modification. The compressor dynamic analysis was performed for rotor speeds of 9000 rpm and 7200 to 7800 rpm, which includes all possible opreating speeds of the compressor in the GCEP Test Facility. While the analysis was performed on this particular AC-12 compressor, the results should be pertinent to other AC-12 applications as well. Similar diagnostic and analytical techniques can be used to evaluate operation of other types of centrifugal compressors.

Spencer, J.W.

1982-01-22T23:59:59.000Z

150

Mass Transfer Testing of a 12.5-cm Rotor Centrifugal Contactor  

SciTech Connect (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

151

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

SciTech Connect (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

152

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

Science Journals Connector (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

153

Design of Rotor-side Controller Using Adaptive Time-frequency Method for DFIG Bearing Fault Detection  

Science Journals Connector (OSTI)

To ensure the reliable operation and power quality of wind power systems, the fault-tolerant control for DFIG is studied in this paper. Based on measured motor currents data, an adaptive statistical time-frequency method is then used to detect the fault ... Keywords: Doubly-fed induction generator, monitoring, wind turbine, rotor side inverter

Suratsavadee K. Korkua

2013-07-01T23:59:59.000Z

154

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

2014-06-24T23:59:59.000Z

155

Virtual dynamic balancing method without trial weights for multi-rotor series shafting based on finite element model analysis  

Science Journals Connector (OSTI)

The traditional influence coefficient dynamic balancing method for multi-rotor series shafting such as turbine-generator sets gas turbines compressor trains and others usually needs to startup many times using trial weights along the rotor. Based on finite element model analysis for the multi-rotor series shafting a virtual dynamic balancing methodology which only needs to collect data of vibration response at operating speed without trial weights is developed in this paper. According to shafting structure and operating parameters the dynamic finite element model was built by using rotor dynamics theory and finite element simulation technology. The shafting dynamic characteristics and weighted influence coefficient matrix can be gotten by exciting virtual unbalance force on the balance place correspondingly. The effectiveness and flexibility of the proposed method have been illustrated by solving a shafting dynamic balancing example with no trial weights requirements. It is believed that the new methods developed in this work will help in reducing the time and cost of the equipment manufacturer or field dynamic balancing procedures.

2014-01-01T23:59:59.000Z

156

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

Broader source: All U.S. Department of Energy (DOE) Office Webpages (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.

157

Indirect rotor position sensing in real time for brushless permanent magnet motor drives  

SciTech Connect (OSTI)

This paper describes a modern solution to real-time rotor position estimation of brushless permanent magnet (PM) motor drives. The position estimation scheme, based on flux linkage and line-current estimation, is implemented in real time by using the abc reference frame, and it is tested dynamically. The position estimation model of the test motor, development of hardware, and basic operation of the digital signal processor (DSP) are discussed. The overall position estimation strategy is accomplished with a fast DSP (TMS320C30). The method is a shaft position sensorless method that is applicable to a wide range of excitation types in brushless PM motors without any restriction on the motor model and the current excitation. Both rectangular and sinewave-excited brushless PM motor drives are examined, and the results are given to demonstrate the effectiveness of the method with dynamic loads in closed estimated position loop.

Ertugrul, N. [Univ. of Adelaide (Australia). Dept. of Electrical and Electronic Engineering] [Univ. of Adelaide (Australia). Dept. of Electrical and Electronic Engineering; Acarnley, P.P. [Univ. of Newcastle upon Tyne (United Kingdom). Dept. of Electrical and Electronic Engineering] [Univ. of Newcastle upon Tyne (United Kingdom). Dept. of Electrical and Electronic Engineering

1998-07-01T23:59:59.000Z

158

New Method to Study Spin Conversion of a Nuclear-Spin Rotor with Low Tunnel Splitting  

Science Journals Connector (OSTI)

A new method is developed to measure the spin-conversion time ?con in low-tunnel-frequency systems. The experiment uses field cycling and consists of three steps: saturation of the tunnel reservoir by Zeeman-tunnel resonance; waiting, away from resonance, during a variable time interval tW; and measurement of the decreased tunnel temperature TT, by use of a saturated Zeeman reservoir. A plot of TT vs tW yields ?con. ?con of CH3 rotors in copper acetate is measured at 15, 12.5, and 6 K and turns out to be extremely long, at least 20T1. This discrepancy is discussed and compared with the one found in lithium acetate.

Greta Vandemaele; Paul Coppens; Lieven Van Gerven

1986-03-17T23:59:59.000Z

159

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

SciTech Connect (OSTI)

By adopting the fully quantal triaxial particle-rotor model, the candidate chiral doublet bands in odd-A nuclei {sup 103}Rh and {sup 105}Rh with {pi}g{sub 9/2}{sup -1} x {nu}h{sub 11/2}{sup 2} configuration are studied. For the doublet bands in both nuclei, agreement is excellent for the observed energies over the entire spin range and B(M1)/B(E2) at higher spin range. The evolution of the chiral geometry with angular momentum is discussed in detail by using the angular momentum components and their probability distributions. Chirality is found to change from chiral vibration to nearly static chirality at spin I=37/2 and back to another type of chiral vibration at higher spin. The influence of the triaxial deformation {gamma} is also studied.

Qi, B.; Wang, S. Y. [Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, School of Space Science and Physics, Shandong University at Weihai, Weihai 264209 (China); Zhang, S. Q. [State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, 100871 Beijing (China); Meng, J. [State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, 100871 Beijing (China); School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191 (China); Department of Physics, University of Stellenbosch, Matieland 7602 (South Africa); Koike, T. [Department of Physics, Tohoku University, Sendai 980-8578 (Japan)

2011-03-15T23:59:59.000Z

160

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

Broader source: All U.S. Department of Energy (DOE) Office Webpages (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

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

Rotor reference frame models of a multiloop 2-phase motor drive in brushless DC and microstepping modes  

SciTech Connect (OSTI)

This paper describes non-linear models of a 2-phase permanent magnet synchronous motor drive in brushless DC and microstepping modes. The models account for everything from the main power bus up to and including the mechanical load and velocity feedback loop. In particular, the models include the power electronics for each phase complete with their internal feedback loops. Classical state space averaged power electronics models are transformed to the rotor reference frame along with the usual electromechanical variables. Since SPICE linearizes the rotor reference frame model about shaft velocity, instead of shaft angle, frequency domain methods apply. The frequency domain analysis detects unstable interactions between torque angle and deliberate feedback within the drives. Time domain simulations using stator reference frame models confirm the results. All models are SPICE-compatible but were developed on Cadence`s Analog Workbench.

Chen, J.E. [Lockheed Missiles and Space Co. Inc., Sunnyvale, CA (United States)

1995-12-31T23:59:59.000Z

162

Predictive current control of outer-rotor five-phase BLDC generators applicable for off-shore wind power plants  

Science Journals Connector (OSTI)

Abstract Model predictive control algorithms have recently gained more importance in the field of wind power generators. One of the important categories of model predictive control methods is improved deadbeat control in which the reverse model of generator is used to calculate the appropriate inputs for the next iteration of controlling process. In this paper, a new improved deadbeat algorithm is proposed to control the stator currents of an outer-rotor five-phase BLDC generator. Extended Kalman filter is used in the estimation step of proposed method, and generator equations are used to calculate the appropriate voltages for the next modulation period. Two aspects of proposed controlling method are evaluated including its sensitivity to generator parameter variations and its speed in following the reference values of required torque during transient states. Wind power generators are kept in mind, and proposed controlling method is both simulated and experimentally evaluated on an outer-rotor five-phase BLDC generator.

Jose Luis Romeral Martinez; Ramin Salehi Arashloo; Mehdi Salehifar; Juan Manuel Moreno

2014-01-01T23:59:59.000Z

163

Spinning rotor gauge based vacuum gauge calibration system at the Institute for Plasma Research (IPR)  

Science Journals Connector (OSTI)

The Steady-state Superconducting Tokamak (SST-1) is an indigenously built medium sized fusion device at IPR designed for plasma duration of 1000 seconds. It consists of two large vacuum chambers – Vacuum Vessel (16 m3) and Cryostat (39 m3) which will be pumped to UHV and HV pressures respectively using a set of turbo molecular pumps, Cryo-pumps and Roots pumps. The total as well as the partial pressure measurement in these chambers will be carried out using a set of Pirani gauges, Bayard Alpert type gauges, Capacitance manometers and Residual Gas Analyzers (RGA). A reliable and accurate pressure measurement is essential for successful operation of SST-1 machine. For this purpose a gauge calibration system is set up in SST-1 Vacuum laboratory based on Spinning Rotor Gauge which can measure absolute pressure in the range 1.0 mbar to 1.0 ? 10?7 mbar. This system is designed to calibrate up to five gauges simultaneously for different gases in different operating pressure ranges of the gauges. This paper discusses the experimental set-up and the procedure adopted for the calibration of such vacuum gauges.

Pratibha Semwal; Ziauddin Khan; Kalpesh R Dhanani; Firozkhan S Pathan; Siju George; Dilip C Raval; Prashant L Thankey; Yuvakiran Paravastu; Himabindu M

2012-01-01T23:59:59.000Z

164

Rotor Support Technology Developments for Long Life Closed Brayton Cycle Turbines  

Science Journals Connector (OSTI)

Power conversion systems based upon the Closed Brayton Cycle (CBC) turbine are under consideration for space power generation applications. Using this approach inert gas heated with a nuclear reactor or other means is used to drive a turbine?generator in a recirculating flow path. As a closed system contamination of the working fluid for instance with bearing lubricating oil cannot be tolerated. To prevent this possibility compliant surface gas film bearings are employed that use the working fluid as their lubricant. Foil gas bearings are in widespread use in turbocompressors and microturbines in aeronatuics and terrestrial applications. To successfully implement them for space power CBC systems research is underway at NASA’s Glenn Research Center to assess foil bearing start?up torque requirements bearing thermal management and the effects of high ambient pressures in inert gases on performance. This paper introduces foil gas bearing rotor support technologies and provides an update on bearing performance testing and evaluations being conducted to integrate foil bearings in future CBC turbine systems.

Christopher DellaCorte; Kevin C. Radil; Robert J. Bruckner; Steven W. Bauman; Bernadette J. Puleo; Samuel A. Howard

2006-01-01T23:59:59.000Z

165

Control of a DFIG-based wind energy conversion system operating under harmonically distorted unbalanced grid voltage along with nonsinusoidal rotor injection conditions  

Science Journals Connector (OSTI)

Abstract In this study, novel hybrid proportional-integral-harmonic resonant (PI-R) controllers implemented in the both (dq)+ and rotor (?r?r) reference frames are presented to control a doubly fed induction generator (DFIG)-based wind power generation system operating simultaneously under the three conditions which are nonsinusoidal rotor voltage injection, harmonically distorted grid voltage, and unbalanced grid voltage. The contribution of this work is to present a novel control scheme implemented in the both (dq)+ and rotor (?r?r) reference frames by considering all the three mentioned conditions (no one or two of them). It will be shown that the proposed control scheme keeps the DFIG in an acceptable operation margin and furthermore, it eliminates all harmonics and pulsations components from the stator and the rotor circuits when the DFIG operates under harmonically distorted unbalanced grid voltage along with quasi-sine rotor injection conditions. The proposed control scheme is simulated in MATLAB/Simulink and simulated results are presented to validate the theoretical results. Although this work is carried out under the three mentioned conditions and other related works have been reported under only one condition, comparison between the results of this work and other works is performed to prove the excellent performances of the proposed control scheme.

Hassan Fathabadi

2014-01-01T23:59:59.000Z

166

Transportation of a 451 ton generator stator and a 234 ton generator rotor from Hartsville, TN, to Los Alamos, NM  

SciTech Connect (OSTI)

A 1430 MVA steam turbine generator was acquired from a cancelled nuclear power plant in Tennessee to be used as the pulsed power and energy storage unit for the Confinement Physics Research Facility being built at Los Alamos, NM. The transportation from Hartsville, near Nashville, TN, to Los Alamos, NM, of the two largest single pieces of the generator, a 451 t stator and a 234 t rotor presented a special challenge. Details of the move, by barge from Hartsville to Catoosa, near Tulsa, OK, by rail from Catoosa to Lamy, near Santa Fe, NM, and by road from Lamy to Los Alamos are described. The greatest difficulty of the successful move was the crossing of the Rio Grande river on an existing reinforced concrete bridge. The two-lane wide road transporters for the stator and rotor were fitted with outriggers to provide a four-lane wide vehicle, thus spreading the load over the entire bridge width and meeting acceptable load distribution and bridge safety factors. 2 refs., 6 figs.

Boenig, H.J.; Rogers, J.D.; McLelland, G.R.; Pelts, C.T. (Los Alamos National Lab., NM (USA); McLelland Engineering, Dallas, TX (USA); Reliance Crane and Rigging, Inc., Phoenix, AZ (USA))

1989-01-01T23:59:59.000Z

167

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

Science Journals Connector (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 phasors obtained from a phasor measurement unit supposed to be installed on the extra-high voltage side of the substation of a power plant, together with a multilayer perceptron trained off-line from simulations. We demonstrate that an intuitive approach to directly map phasor measurement inputs to the neural network to generator rotor angle does not offer satisfactory results. We found out that a good way to approach the angle estimation problem is to use two neural networks in order to estimate the sin ( ? ) and cos ( ? ) of the angle and recover the latter from these values by simple post-processing. Simulation results on a part of the Mexican interconnected system show that the approach could yield satisfactory accuracy for real-time monitoring and control of transient instability.

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

2007-01-01T23:59:59.000Z

168

Analyse numrique qualitative d'interactions rotor/stator dans un compresseur haute pression d'un moteur d'hlicoptre  

E-Print Network [OSTI]

are carried out on the centrifugal compressor of a modern heli- copter engine, for which it is assumed méthodologie systématique d'analyse. Les simulations d'interaction sont réalisées sur un compresseur centrifuge-harmoniques du chargement imposé. A qualitative numerical analysis of rotor-casing interactions in centrifugal

Paris-Sud XI, Université de

169

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

SciTech Connect (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

170

Real-time Stereo Visual Servoing Control of an UAV having Eight-Rotors Sergio Salazar, Hugo Romero, Jose Gomez and Rogelio Lozano  

E-Print Network [OSTI]

Real-time Stereo Visual Servoing Control of an UAV having Eight-Rotors Sergio Salazar, Hugo Romero UAV using image-based visual servoing with stereo vision. In order to control the orientation vision system we are able to estimate the UAV 3D position, while from the inertial sensors we can obtain

Paris-Sud XI, Université de

171

3038 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 55, NO. 8, AUGUST 2008 Control of High-Speed Solid-Rotor Synchronous  

E-Print Network [OSTI]

Stator resistance. I. INTRODUCTION UNINTERRUPTIBLE power supply (UPS) systems have been widely utilized]­[5]. High-power flywheels can provide backup power to handle the majority of power disruptions that last-Speed Solid-Rotor Synchronous Reluctance Motor/Generator for Flywheel-Based Uninterruptible Power Supplies Jae

Hofmann, Heath F.

172

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

Broader source: All U.S. Department of Energy (DOE) Office Webpages (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

173

Synchronous motor with soft start element formed between the motor rotor and motor output shaft to successfully synchronize loads that have high inertia and/or high torque  

DOE Patents [OSTI]

A line-start synchronous motor has a housing, a rotor shaft, and an output shaft. A soft-start coupling portion is operatively coupled to the output shaft and the rotor shaft. The soft-start coupling portion is configurable to enable the synchronous motor to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling. The synchronous motor is sufficiently rated to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling.

Umans, Stephen D; Nisley, Donald L; Melfi, Michael J

2014-10-28T23:59:59.000Z

174

Development and Field-Scale Optimization of a Honeycomb Zeolite Rotor Concentrator/Recuperative Oxidizer for the Abatement of Volatile Organic Carbons from Semiconductor Industry  

Science Journals Connector (OSTI)

Also the developed rotor performance’s was evaluated in the field; (2) Direct Fired Thermal Oxidizer (DFTO), Recuperative Oxidizer (RO), Regenerative Thermal Oxidizer (RTO) and Regenerative Catalytic oxidizer (RCO) are the available incinerators and the RO was selected as the oxidizer in this work; (3) The overall performance of the developed rotor/oxidizer was explored in a field scale under varying conditions; (4) The energy saving strategy was fulfilled by reducing heat loss from the oxidizer and recovering heat from the exhaust gas. ... The available types of oxidizers include Direct Fired Thermal Oxidizer (DFTO), Recuperative Oxidizer (RO), Regenerative Thermal Oxidizer (RTO) and Regenerative Catalytic oxidizer (RCO). ... cost models were derived for recuperative thermal (TO) and regenerative thermal oxidizers (RTO). ...

Ji Yang; Yufeng Chen; Limei Cao; Yuling Guo; Jinping Jia

2011-11-17T23:59:59.000Z

175

Reliability of steam-turbine rotors. Task 1. Lifetime prediction analysis system. Final report. [Using STRAP and SAFER computer codes and boresonic data  

SciTech Connect (OSTI)

Task 1 of RP 502, Reliability of Steam Turbine Rotors, resulted in the development of a computerized lifetime prediction analysis system (STRAP) for the automatic evaluation of rotor integrity based upon the results of a boresonic examination of near-bore defects. Concurrently an advanced boresonic examination system (TREES), designed to acquire data automatically for lifetime analysis, was developed and delivered to the maintenance shop of a major utility. This system and a semi-automated, state-of-the-art system (BUCS) were evaluated on two retired rotors as part of the Task 2 effort. A modified nonproprietary version of STRAP, called SAFER, is now available for rotor lifetime prediction analysis. STRAP and SAFER share a common fracture analysis postprocessor for rapid evaluation of either conventional boresonic amplitude data or TREES cell data. The final version of this postprocessor contains general stress intensity correlations for elliptical cracks in a radial stress gradient and provision for elastic-plastic instability of the ligament between an imbedded crack and the bore surface. Both linear elastic and ligament rupture models were developed for rapid analysis of linkup within three-dimensional clusters of defects. Bore stress-rupture criteria are included, but a creep-fatigue crack growth data base is not available. Physical and mechanical properties of air-melt 1CrMoV forgings are built into the program; however, only bounding values of fracture toughness versus temperature are available. Owing to the lack of data regarding the probability of flaw detection for the boresonic systems and of quantitative verification of the flaw linkup analysis, automatic evlauation of boresonic results is not recommended, and the lifetime prediction system is currently restricted to conservative, deterministic analysis of specified flaw geometries.

Nair, P.K.; Pennick, H.G.; Peters, J.E.; Wells, C.H.

1982-12-01T23:59:59.000Z

176

Manufacturing and properties of newly developed 9%CrMoVNiNbN high-pressure low-pressure rotor shaft forging  

SciTech Connect (OSTI)

In order to obtain the improved strength and toughness for high-pressure low-pressure rotor shaft forging, fundamental studies using laboratory heats were performed on the 9CrMoV base materials, and effects of chemistry on toughness and creep rupture strength were investigated. From the investigation, it is showed that the superclean 9CrMoVNiNbN steel with reduced Si and Mn contents and Ni addition provides a superior strength versus toughness balance. Based on these fundamental studies, a trial high-pressure low-pressure rotor shaft forging with diameter of low-pressure section of 1,750 mm and diameter of high-pressure section of 1,200 mm was successfully manufactured from the diameter of 1,800 mm, and the weight of 65 ton ESR ingot. From the evaluation test results of this trial rotor forging, homogeneous distribution of chemistry was confirmed and low impurity contents was observed in the whole forging. The superior strength and toughness were confirmed with good creep rupture strength. The FATT at the center of low-pressure section was {minus}3 C with the tensile strength level of 870 MPa. From the results of fracture toughness test, low cycle fatigue test, and isothermal aging test, superior mechanical properties were demonstrated. Thus, the superclean 9CrMoVNiNbN steel with reduced Si and Mn contents and Ni addition, is particularly suitable for the high-pressure low-pressure rotor material for advanced combined cycle power plants.

Azuma, Tsukasa; Tanaka, Yasuhiko; Ishiguro, Tohru; Yoshida, Hajime; Ikeda, Yasumi [Japan Steel Works, Muroran (Japan)

1997-12-31T23:59:59.000Z

177

Experimental investigation of pressure loss and heat transfer in a rotor–stator cavity with two outlets  

Science Journals Connector (OSTI)

Abstract This article presented detailed measurements of the pressure distribution and heat transfer in a rotor–stator cavity with inlet of orifices on the rotating disk and two outlets at both low radius and high radius. Transient thermochromic liquid crystal (TLC) technique was employed to determine the convective heat transfer characteristics on the test surface of the rotating disk. Rotational Reynolds numbers (Re?) ranging from 4.9 × 105 to 2.47 × 106 and dimensionless flow rate (Cw) between 6.9 × 103 and 2.72 × 104 were considered. Experimental results indicated that the characteristics of the pressure loss coefficient between the inlet and the outlet was strongly dependent on the Re? and Cw. Under the current operating conditions, the heat transfer on the surface of the rotating disk was weakened at both in the upper and lower edges for the case of r/R = 0.775 due to the existence of the recirculation. Whereas the heat transfer were enhanced near the upper radius with relatively low flow rate and high rotational speed, as well as on the middle radius with relatively high flow rate and low rotational speed.

X. Luo; G. Han; H. Wu; L. Wang; G. Xu

2014-01-01T23:59:59.000Z

178

Modeling Creep-Fatigue-Environment Interactions in Steam Turbine Rotor Materials for Advanced Ultra-supercritical Coal Power Plants  

SciTech Connect (OSTI)

The goal of this project is to model creep-fatigue-environment interactions in steam turbine rotor materials for advanced ultra-supercritical (A-USC) coal power Alloy 282 plants, to develop and demonstrate computational algorithms for alloy property predictions, and to determine and model key mechanisms that contribute to the damages caused by creep-fatigue-environment interactions. The nickel based Alloy 282 is selected for this project because it is one of the leading candidate materials for the high temperature/pressure section of an A-USC steam turbine. The methods developed in the project are expected to be applicable to other metal alloys in similar steam/oxidation environments. The major developments are: ? failure mechanism and microstructural characterization ? atomistic and first principles modeling of crack tip oxygen embrittlement ? modeling of gamma prime microstructures and mesoscale microstructure-defect interactions ? microstructure and damage-based creep prediction ? multi-scale crack growth modeling considering oxidation, viscoplasticity and fatigue The technology developed in this project is expected to enable more accurate prediction of long service life of advanced alloys for A-USC power plants, and provide faster and more effective materials design, development, and implementation than current state-of-the-art computational and experimental methods. This document is a final technical report for the project, covering efforts conducted from January 2011 to January 2014.

Shen, Chen

2014-01-20T23:59:59.000Z

179

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

SciTech Connect (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

180

The new ductile fracture criterion for 30Cr2Ni4MoV ultra-super-critical rotor steel at elevated temperatures  

Science Journals Connector (OSTI)

Abstract In this paper a new ductile fracture criterion was derived by taking into account the plastic deformation capacity of material and stress states, which can be used to describe fracture behavior and critical rupture conditions of 30Cr2Ni4MoV ultra-super-critical rotor steel during hot forging process. In order to establish this criterion, the tensile tests at different temperatures and strain rates were firstly conducted on Gleeble-1500 thermo-mechanical simulator, and then a measurement and conversion method was applied to estimate the equivalent fracture strain ? ¯ f that represents the deformation capacity of material in ductile fracture process. Experimental results indicated that ? ¯ f greatly depends on the temperature and strain rate. A model of ? ¯ f as a function of the temperature and strain rate was also established. To validate the proposed fracture criterion, additionally, the simulation of tensile test and the fractographic observation of the tensile specimen were conducted. The upsetting tests that possess different stress states and the corresponding numerical simulations were also performed. These results show that the developed criterion can accurately predict the cracks initiation and the location of the cracks at elevated temperatures.

Jianli He; Zhenshan Cui; Fei Chen; Yanhong Xiao; Liqun Ruan

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

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 (OSTI)

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

182

Nomenclature R mean rotor radius  

E-Print Network [OSTI]

; Hysteresis loops 1. Introduction Axial #ow compressors are subject to two distinct aerodynamic instabilities). Automatica 37 (2001) 921}931 Brief Paper Rotating stall control for axial #ow compressors Calin Belta, rotating stall and surge, which can severely limit the compressor performance. Both these instabilities

Belta, Calin A.

183

Sandia National Laboratories: Rotor Innovation  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Engine Test Facility Central Receiver Test Facility Power Towers for Utilities Solar Furnace Dish Test Facility Optics Lab Parabolic Dishes Work For Others (WFO) User...

184

Sandia National Laboratories: SMART Rotor Video  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Photovoltaics Engine Test Facility Central Receiver Test Facility Power Towers for Utilities Solar Furnace Dish Test Facility Optics Lab Parabolic Dishes Work For Others...

185

Sandia National Laboratories: Rotor Design Tools  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Engine Test Facility Central Receiver Test Facility Power Towers for Utilities Solar Furnace Dish Test Facility Optics Lab Parabolic Dishes Work For Others (WFO) User...

186

Sandia National Laboratories: Rotor Aerodynamic Design  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Engine Test Facility Central Receiver Test Facility Power Towers for Utilities Solar Furnace Dish Test Facility Optics Lab Parabolic Dishes Work For Others (WFO) User...

187

Energy storage in composite flywheel rotors.  

E-Print Network [OSTI]

??ENGLISH ABSTRACT: As the push continues for increased use of renewables on the electricity grid, the problem of energy storage is becoming more urgent than… (more)

Janse van Rensburg, Petrus J.

2011-01-01T23:59:59.000Z

188

Sandia National Laboratories: functional rotor scaling  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Doppler Velocimeter EC Top Publications A Comparison of Platform Options for Deep-water Floating Offshore Vertical Axis Wind Turbines: An Initial Study Nonlinear Time-Domain...

189

Flow visualization and analysis of aerodynamically detuned supersonic rotors  

Science Journals Connector (OSTI)

The effect of aerodynamic detuning on the supersonic steady and unsteady blade passage flow field is experimentally investigated on a free surface water table by means of color Schlieren and shadowgraph flow v...

C. S. Farmer; S. Fleeter

1988-01-01T23:59:59.000Z

190

SMART Wind Turbine Rotor: Data Analysis and Conclusions  

Broader source: Energy.gov [DOE]

This report documents the data post-processing and analysis performed to date on the field test data.

191

DOE and Sandia National Laboratories Develop National Rotor Testbed...  

Energy Savers [EERE]

The SWiFT facility, which was commissioned this July, is unique in that it utilizes wind turbines that are large enough to represent the physics relevant to utility-scale machines,...

192

Chaos in a rotor system supported by ball bearings  

E-Print Network [OSTI]

. The positioning of the probes can be seen in Figure l. These voltages were read digitally using a computer equipped with an Analog/Digital Card. MATLAB Simulink was used to interface with the data acquisition card and obtain the data. A Simulink model... enters the window it is perturbed so that it is forced into the orbit just below the window. This orbit can be of any period. The MATLAB Simulink implementation of this controller used for experimentation is shown below: Figure 14: Simulink Model...

Fisher, James Robert, 1979-

2013-02-22T23:59:59.000Z

193

Magnetism and Mott transition: A slave-rotor study  

E-Print Network [OSTI]

Motivated by the debate of the spin-density-wave (SDW) versus local-moment (LM) picture in the iron-based superconducting (FeSC) materials, we consider a two-band orbital-symmetric Hubbard model in which there is robust ...

Ko, Wing Ho

194

Symmetry and dynamics of molecular rotors in amphidynamic molecular crystals  

Science Journals Connector (OSTI)

...similar in magnitude to the gas phase rotational barrier for the methyl groups...Medicine, University of Missouri-Columbia, 1514 Research...dispersion in mineral oil) in 500 mL of 1,2-dimethoxyethane...Eibling and J. Li, Unique gas and hydrocarbon adsorption...

Steven D. Karlen; Horacio Reyes; R. E. Taylor; Saeed I. Khan; M. Frederick Hawthorne; Miguel A. Garcia-Garibay

2010-01-01T23:59:59.000Z

195

Symmetry and dynamics of molecular rotors in amphidynamic molecular crystals  

Science Journals Connector (OSTI)

...axial symmetry order Cn represented with a heavy line with the enclosure formed by their close...Nano & Molecular Medicine, University of Missouri-Columbia...20 g of a 60% dispersion in mineral oil) in 500 mL of 1,2-dimethoxyethane...

Steven D. Karlen; Horacio Reyes; R. E. Taylor; Saeed I. Khan; M. Frederick Hawthorne; Miguel A. Garcia-Garibay

2010-01-01T23:59:59.000Z

196

Hybrid Rotor Compression for Multiphase and Liquids-Rich Wellhead  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Introduction OsComp Systems sought out to design a compressor that could help to make the production and transportation of natural gas more cost effective for producers,...

197

Bending vibration measurement on rotors by laser vibrometry  

Science Journals Connector (OSTI)

A new technique is proposed for noncontact measurement of bending vibration directly from a rotating component. This notoriously difficult and previously unattained measurement is a...

Miles, Toby; Lucas, Margaret; Rothberg, Steve

1996-01-01T23:59:59.000Z

198

A Design Study ofa 1MW Stall Regulated Rotor  

E-Print Network [OSTI]

of special tailored airfoils has been found to be around 4% on the annual energy production and 1 55 4.8 Summary 56 5 Comparison with LM 24.0 59 5.1 Assumptions 59 5.2 Geometry 60 5.3 Annual energy production and loads 62 5.4 Materia

199

Engineering rotor ring stoichiometries in the ATP synthase  

Science Journals Connector (OSTI)

...for the future. The proposed strategy for altering the ion-to-ATP...force fields: Limitations of gas-phase quantum mechanics...sequencing (Scientific Research and Development GmbH and Eurofins MWG GmbH...biology. Proton-powered turbine of a plant motor. Nature 405...

Denys Pogoryelov; Adriana L. Klyszejko; Ganna O. Krasnoselska; Eva-Maria Heller; Vanessa Leone; Julian D. Langer; Janet Vonck; Daniel J. Müller; José D. Faraldo-Gómez; Thomas Meier

2012-01-01T23:59:59.000Z

200

SMART Wind Turbine Rotor: Data Analysis and Conclusions  

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

system HP high-pressure (the nominally upwind surface of a HAWT blade) IMU inertial measurement unit inboard toward the root end of a wind turbine blade LE leading edge of wind...

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

CFD Simulation of the NREL Phase VI Rotor  

E-Print Network [OSTI]

The simulation of the turbulent and potentially separating flow around a rotating, twisted, and tapered airfoil is a challenging task for CFD simulations. This paper describes CFD simulations of the NREL Phase VI turbine that was experimentally characterized in the 24.4m x 36.6m NREL/NASA Ames wind tunnel (Hand et al., 2001). All computations in this article are performed on the experimental base configuration of 0o yaw angle, 3o tip pitch angle, and a rotation rate of 72 rpm. The significance of specific mesh resolution regions to the accuracy of the CFD prediction is discussed. The ability of CFD to capture bulk quantities, such as the shaft torque, and the detailed flow characteristics, such as the surface pressure distributions, are explored for different inlet wind speeds. Finally, the significant three-dimensionality of the boundary layer flow is demonstrated.

Song, Yang

2014-01-01T23:59:59.000Z

202

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

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

brushless adjustable field excitation for high starting torque, field weakening, and power factor improvement and novel locks for higher peak speed. This novel machine shows...

203

Sandia National Laboratories: capture more wind with longer rotors  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Plan Webinar Wednesday, Jan. 14 Sandian Presents on PV Failure Analysis at European PV Solar Energy Conference and Exhibition (EU PVSC) EC Top Publications Design and Analysis for...

204

Sandia National Laboratories: Rotor Blade Sensors and Instrumentation  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Engine Test Facility Central Receiver Test Facility Power Towers for Utilities Solar Furnace Dish Test Facility Optics Lab Parabolic Dishes Work For Others (WFO) User...

205

Development of integral bladed rotor using linear optimisation technique  

Science Journals Connector (OSTI)

Bladed disks are the most flexible elements in high speed rotating machinery. Stress analysis of these elements present some challenges. These challenges stem from high stress gradients due to contact faces, the non-linearities attending conforming contact with friction. Thermal gradients are also encountered across the disc bore and rim due to uneven temperature distribution. The rim of the disc is made heavier to resist the centrifugal pull of the blade, thus making the assembly heavier. Investigations have been carried out to develop and improve 'blisks' which are integrated version of blades and disc, offering significant weight saving. The present paper describes the possible development process of upgrading a general purpose conventional bladed disc of a single stage compressor into blisk, using linear programme, a finite element analysis tool for linear optimisation, as a dedicated 'design-tool' keeping the same operating conditions and the allowable design limits through numerical models. Design methodology, burst-failure criteria of blisk and bladed disc are discussed in full length. This tool developed exploits the quick convergence ability of a linear system for handling large iterations and overcomes the limitation imposed by material non-linearity, over-speed and burst margin for all decision points based on stress, strain and displacement, in the design-flow process.

K. Kumar; S.L. Ajit Prasad; K. Ramachandra

2012-01-01T23:59:59.000Z

206

Engineering rotor ring stoichiometries in the ATP synthase  

Science Journals Connector (OSTI)

...Limitations of gas-phase quantum mechanics...the University of Technology...Scientific Research and Development GmbH and Eurofins...10 Genetic fusion technology (3, 4) Thermophilic...10 Genetic fusion technology...Proton-powered turbine of a plant motor...

Denys Pogoryelov; Adriana L. Klyszejko; Ganna O. Krasnoselska; Eva-Maria Heller; Vanessa Leone; Julian D. Langer; Janet Vonck; Daniel J. Müller; José D. Faraldo-Gómez; Thomas Meier

2012-01-01T23:59:59.000Z

207

Characteristics of a multiple disk pump with turbulent rotor flow  

E-Print Network [OSTI]

DIRHETER IINIt tl, DISCHARGE OIANETER IINlt 3. CLEARANCE OETHEEN DISKS 0. 13636 IN. TYPE SEALJ PRCKING DISKFLO PUHP; NODEL K03 TOTRL HERO HORSEPOHER X EFFICIENCY + NPSH AVAIL V Figure 12. Performance of the 11 Disk Pump at 890 rpm (Test 2) C& C...: D. 13636 IN 111'E 5EAI. PACK(NO OISKFLD PL'. "P: HDD L 40 TOTAL HERO HDRSEPOHER X EFFICIENCY + NPSH AVAIL Y Figure 14 . Performance of the 1 1 Disk Pump at 1 790 rpm ( Tes t 1 ) CV o O C) CI O C) O \\ C CC C O I-!-W I o O O O 6 )3...

Roddy, Patrick James

1985-01-01T23:59:59.000Z

208

The Brazil Technology Center Speeds the Pace of Innovation |...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Brazil Technology Center Speeds the Pace of Innovation The Brazil Technology Center Speeds the Pace of Innovation Bruno Betoni Parodi 2012.09.06 (Please find Portuguese translation...

209

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

SciTech Connect (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

210

Analytical determination of performance degradation on a helicopter main rotor due to ice accretion  

E-Print Network [OSTI]

1 ), aerodynami c center (A. C. ) ~ and moment coefficient at zero I iFt (Cm ). These are al 1 derived from mo the previously calculated Fourier coefficients. 26 z ? Plane 1 Figure 10a The Airfoil Plane z ? Plane 2 -S 1 -e r x2 Figure 10b... 1-e where, 'o ' cl'n"0 + 'Z(a"Kp) + c3 + 4 p + C5?anKO + c6? anK + c ? (anK ) 2 2 2 2 2 8?0/e ) + cg(~KO/e ) + clpr + cllt + c12ranKO + t + c ?/r ?/10 ?/10 2 2 2 2 2 15 0 + c15?/t + c17r + cl8t + clg(r?) + c20(tKO) + c (rK ) 22 t 23 0"t + C243...

Camba, Javier

2012-06-07T23:59:59.000Z

211

COE Reductions through Active Aerodynamic Control of Rotor Aerodynamics and Geometry  

SciTech Connect (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

212

Rational design of molecular rotors as beta amyloid binding agents and viscosity sensors  

E-Print Network [OSTI]

out on 0.25 mm Dynamic Adsorbents, Inc. silica gel plates (and applying heat. Dynamic Adsorbents, Inc. silica gel (60,out on 0.25 mm Dynamic Adsorbents, Inc. silica gel plates (

Chang, Willy M.

2011-01-01T23:59:59.000Z

213

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) [San Diego, CA

2008-06-03T23:59:59.000Z

214

Measurements of unbalance response in a squeeze film damper test rotor-kit  

E-Print Network [OSTI]

for three cases: centered journal, offcentered journal at 30% and 60% of the radial clearance. Different masses of unbalance are used for each case . All the experiments were performed at room temperature and at an oil inlet pressure of 6.9 kPa. The cascade...

Laos, Hector Emilio

1995-01-01T23:59:59.000Z

215

The effect of adding axial freedom to the blades of a two bladed helicopter rotor  

E-Print Network [OSTI]

n f O C4 31 O CV 2 Jl C Id c3 O Qk z QJ w 2 CL ~ Z 0 O J z 0 lal I- o o X 0 ('&3g), 315NQ 596/ I 32 t 1 I Il A INj &~a tlB5 ~ ?)gal~ 4 Qw44g 98~gAgA II IC / j l 0 3- l f WWMc C cC y-I c-I A ~t ~+~t...'19N Q 99Qg Cl AJ CL Id w & cd 0 IU A UI LU 0 35 Fit. IS TIP BEFLECT)ON Y5 DRAG AOGLE (+I) Posivio~ ~=. r 0 t G ill 4. 4J A-2 4 Za~e hr O- l I PL4TE UNLOGKE b PLATE LOGKEb CoHWO PL A@I LE ( DEGJ 270 DISCUSSIOI OP RESETS...

Oradat, Frank Robert

2012-06-07T23:59:59.000Z

216

Transient processes in an asynchronous induction electronic excited generator with a short cut rotor  

Science Journals Connector (OSTI)

Electronic transients in an induction electronic excited generator during self-excitation and load variation have...

M. L. Kostyrev

2012-04-01T23:59:59.000Z

217

Numerical simulation of geometry effects for concentric-rotor labyrinth seals  

E-Print Network [OSTI]

a single cavity of a seal. Naturally it &could be preferable to include all cayities, h()&i( ver con)put atiousl resource limil at iona preclude this possil&ilit y. Fi ) ur(. . sh()ivs a magnified view of a small i&(l)'1 n)ll ()I & he g)'Icl. sh... a single cavity of a seal. Naturally it &could be preferable to include all cayities, h()&i( ver con)put atiousl resource limil at iona preclude this possil&ilit y. Fi ) ur(. . sh()ivs a magnified view of a small i&(l)'1 n)ll ()I & he g)'Icl. sh...

Ko, Sung-Ho

2012-06-07T23:59:59.000Z

218

Co-Simulation of an Interior Permanent Magnet Synchronous Motor with Segmented Rotor Structure  

E-Print Network [OSTI]

Christoph Schulte and Joachim B¨ocker Power Electronics and Electrical Drives, Paderborn University, D-33095 Paderborn, Germany schulte@lea.upb.de, boecker@lea.upb.de Abstract--Accurate simulation of electric drives, electrical drive, multi-slice approach I. INTRODUCTION Conventionally, a two-step process is being used

Paderborn, Universität

219

Identification of force coefficients in flexible rotor-bearing systems - enhancements and further validations  

E-Print Network [OSTI]

identification of bearing force parameters, i.e. stiffness and damping coefficients, is one of the most difficult to achieve. Field identification by imbalance response measurements is a simple and often reliable way to determine synchronous speed force...

Balantrapu, Achuta Kishore Rama Krishna

2005-11-01T23:59:59.000Z

220

Magnetic Patterning of Permanent-Magnet Rotors for Microscale Motor/Generators  

E-Print Network [OSTI]

offers three advantages. First, eliminating the integrated winding permits simpler MH design element modeling 1. INTRODUCTION High power-density, microscale, axial-flux, PM machines [1-3] typically (Thickness = 0.5 mm, OD=9.5 mm) encased in a Ti adaptor used for microscale power generator [1]; (b

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

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

222

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...

Marin, Manuel

2012-06-07T23:59:59.000Z

223

Hybrid gas bearings with controlled supply pressure to eliminate rotor vibrations while crossing system critical speeds  

E-Print Network [OSTI]

turbomachinery because of their inherent stability characteristics resulting from no generation of cross- coupled stiffness coefficients [7]. Flexure pivot tilting pad bearings, machined as a single piece using wire EDM (Electrical Discharge Machining) shown... conditions [5]. Gas foil bearings are customarily used in air cycle machines, auxiliary power units, and commercial MTM because of their distinct advantages including tolerance to shaft misalignment and centrifugal/thermal growth, and large load capacity...

Ryu, Keun

2009-05-15T23:59:59.000Z

224

On the characteristics of fault-induced rotor-dynamic bifurcations and nonlinear responses  

E-Print Network [OSTI]

and Poincare map of the response in (a) .........41 3.4 (a) Time history of a nonlinear time-delay model. (b) Corresponding phase portrait and Poincare map of the response in (a) .........42 3.5 Phase portrait and Poincare map of a fractal... reaction forces, which in turn could result in strong nonlinear responses including period-doubling bifurcation, quasi-periodic bifurcation, and even chaotic response [4,5]. Nonlinear dynamical states of quasi-periodic, fractal, and chaotic motions...

Yang, Baozhong

2004-11-15T23:59:59.000Z

225

Numerical study of a rotor/stator interaction case experimentally simulated with an industrial compressor  

E-Print Network [OSTI]

energy efficiency may be achieved by minimizing the clearance between the rotating blade tips- tion of the HR15Y hardness test on abradable material. It was shown that a bilinear plastic law could developments focused on the modeling of abradable coating through mono-dimensional plastic el- ements [10

Paris-Sud XI, Université de

226

Measurements of imbalance response for a rigid rotor fully supported on squeeze film dampers.  

E-Print Network [OSTI]

??Modern high performance turbomachinery providing increased power to weight ratios and larger efficiencies are designed to operate at higher speeds than prior designs. These machines… (more)

Lubell, Daniel Roger

2012-01-01T23:59:59.000Z

227

Imbalance response of a rotor supported on a floating ring fluid film bearing  

E-Print Network [OSTI]

rig model. 5. 14 Rotordynamic damped natural frequency map for nominal clearance configuration (C, =114. 3 pm, C, =165. 1tim). 5. 15 Rotordynamic damped natural frequency map for n- clearance configuration (C, =114. 3 pm, C, =152. 4 lrm) 5. 16...). . . . . . . . . . 7. 16 Peak to peak vibration amplitude versus journal speed. Pressure Page 86 supply 41. 4 kPa (6 psig). nominal clearance configuration (C, =114. 3 lrm and C, =165. 1 lrm). Residual imbalance. Semi-floating bearing. . 88 7. 17 Contour plots...

Naranjo, Julio Enrique

2012-06-07T23:59:59.000Z

228

The effect of teeth-on-stator labyrinth seals on rotor imbalance response  

E-Print Network [OSTI]

difficuhies that necessitated major design changes. These changes included teplacement of the hydrostatic air bearings suppordng the jack shaft with grease lubricated bearings, modification of the seal housing to allow adequate air flow to the seal chamber... the effect on the mtor imbalance response. Tests were performed over a shaft speed range of 0 to 5000 tpm and an air pressure range of 0 to 225 psig at the seal inlet. The fourth objective of this research was to determine the cross-coupled stiffness...

Conway, Eileen Marie

2012-06-07T23:59:59.000Z

229

American Institute of Aeronautics and Astronautics Numerical Solutions for Ultra-Micro Wave Rotors (UWR)  

E-Print Network [OSTI]

) commercial code. Nomenclature A = cross-sectional area Cpair = specific heat for air e = internal energy f = friction coefficient fx = body forces in x-direction air = air specific heat ratio comb = efficiency University of Technology, Warsaw, Poland and Norbert Müller Michigan State University, East Lansing, MI

Müller, Norbert

230

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

231

UNIVERSITY of CALIFORNIA INVESTIGATION OF HOW ANGLE OF ATTACK AFFECTS ROTOR SPEED  

E-Print Network [OSTI]

.1 Wind Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Wind Turbines Mathematica Notebook 37 Appendix D Multiview and Assembly Drawings 40 #12;1 1 Introduction 1.1 Wind Power To determine the available power in the wind consider a thin disc of cross- sectional area A and thickness dx

Belanger, David P.

232

Removing the Influence of Rotor Harmonics for Improved Monitoring of Offshore Wind Turbines  

Science Journals Connector (OSTI)

The ability to identify the dynamic properties of offshore wind turbines allows validating and updating numerical tools, which ... of the machine. However, modal identification of turbines in operating conditions...

S. Manzato; C. Devriendt; W. Weijtjens…

2014-01-01T23:59:59.000Z

233

The influence of internal friction on rotordynamic instability  

E-Print Network [OSTI]

Internal friction has been known to be a cause of whirl instability in built-up rotors since the early 1900's. This internal damping tends to make the rotor whirl at shaft speeds greater than a critical speed, the whirl speed usually being equal...

Srinivasan, Anand

2004-09-30T23:59:59.000Z

234

Film Cooling, Heat Transfer and Aerodynamic Measurements in a Three Stage Research Gas Turbine  

E-Print Network [OSTI]

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...

Suryanarayanan, Arun

2010-07-14T23:59:59.000Z

235

Presented at the AHS National Forum in 1989. Prediction and Measurement of the Aerodynamic Interactions Between a  

E-Print Network [OSTI]

the vortical wake generated by its rotors while hovering or flying at low speeds. The resulting interactions. With better engines, higher disk loading, higher forward speeds, and low-altitude mission requirements

236

An experimental investigation of a swirl gas damper for turbomachinery  

E-Print Network [OSTI]

. Smooth Rotor ?2, Modulus at 2 psi Figure 40. Smooth Rotor ?2, Modulus at 3 psi Figure 41. Smooth Rotor ?2, Modulus at 4 psi Figure 42. Smooth Rotor ?2, Modulus at 5 psi Figure 43. Smooth Rotor ?2, Modulus at 6 psi Figure 44. Smooth Rotor ?2, Modulus.... Knurled Rotor ?3, Modulus at 4 psi Figure 54. Knurled Rotor ?3, Modulus at 5 psi 71 72 73 74 75 Page Figure 55. Knurled Rotor ?3, Modulus at 6 psi Figure 56. Knurled Rotor ?3, Modulus at 7 psi Figure 57. Knurled Rotor ?3, Modulus at 8 psi Figuxe...

Handy, Steven Brent

2012-06-07T23:59:59.000Z

237

Eliciting a human understandable model of ice adhesion strength for rotor blade leading edge materials from uncertain experimental data  

E-Print Network [OSTI]

on the thermal conductivity of isotropic materials that protect the leading edge of the blade from erosion. For this reason, electro-thermal de-icing is not ideal for new high erosion resistant polymer based leading edge protec- tion materials because they have lower thermal conductivity than isotropic materials. Due

Granada, Universidad de

238

DEVELOPMENT OF TIP CLEARANCE FLOW DOWNSTREAM OF A ROTOR BLADE WITH COOLANT INJECTION FROM A TIP TRENCH  

E-Print Network [OSTI]

dimensional picture. The small leakage flow through the tip gap has an effect on the loss and heat transfer it imperative to understand the flow field and heat transfer distribution in the blade tip region. Most studies on the secondary flow. The ultimate objective is to re- duce losses by the introduction of high momentum air

Camci, Cengiz

239

Mach number correlation for a two-dimensional helicopter rotor-blade analysis in the tip region  

E-Print Network [OSTI]

. Comparison of chordwise pressure distributions between TRANDES and flight test (TAAT) results. Flight condition B, P = 90 degrees, radius = 86. 4 percent 16 17 3 c. Comparison of chordwise pressure distributions between TRANDES and flight test (TAAT.... 066 CP/SIG = 0. 008 Figure 3 c. Comparison of chordwise TRANDES and flight test 90 degrees, radius AZIMUTH = 90. 0 / RADIUS = 91. 0 MRCH NQ. (QRTRHAPI = 0. 813 CN = 0. 104 RLP(TRRNDESI = 0. 414 pressure distributions between (TAAT) results...

Schillings, John Joseph

1983-01-01T23:59:59.000Z

240

Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing  

E-Print Network [OSTI]

Many researchers have compared predicted stiffness and damping coefficients for tilting-pad journal bearings (TPJBs) to measurements. Most have found that direct damping is consistently overpredicted. The thrust of this research is to explain...

Wilkes, Jason Christopher

2012-02-14T23:59:59.000Z

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.


241

Compressibility effects on rotor forces in the leakage path between a shrouded pump impeller and its housing  

E-Print Network [OSTI]

. Radial displacement perturbations were used to solve for radial and circumferential force coefficients. In addition, impeller-discharge pressure disturbances were used to obtain pressure oscillation responses due to precessing impeller pressure wave... oscillation was shown to occur at the wearing ring seal. Introduction of impeller discharge disturbances with n = 11 diametral nodes showed that maximum peak pressure oscillations occurred at nondimensional precession frequencies (f = Q(ai where co...

Cao, Nhai The

1993-01-01T23:59:59.000Z

242

A Study of the Causes of the Service Fracture of Turbine Rotor Blade of Compressor Station Gas-Turbine Unit  

Science Journals Connector (OSTI)

On the basis of structural and fractographic the analysis of the fractured surface of working turbine blade of GTK-10-2 gas-turbine unit of compressor station it is established...

A. Ya. Krasovs’kyi; O. E. Gopkalo; I. O. Makovets’ka; O. O. Yanko

2013-07-01T23:59:59.000Z

243

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

E-Print Network [OSTI]

motor (PM) is one of the most attractive motors applied in compact electric propulsion system, due to its high efficiency, high reliability, and power density. The interior permanent magnet motor (IPM of V-shape Interior PM Electrical Machine Bassel Aslan, Julien Korecki, Thimoté Vigier, Eric Semail

Paris-Sud XI, Université de

244

A simple rotor current observer with an arbitrary rate of convergence for the Brushless Doubly-Fed  

E-Print Network [OSTI]

. These advantages are realised through a reduced capital installation cost, due to a frac- tional inverter power drive (VSD), and as a generator where the prime mover speed can be variable, such as in a wind turbine requirement (as compared to that for an induction machine VSD (or generator)), and further, the advantages

Cambridge, University of

245

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 25, NO. 4, APRIL 2010 907 Rotor Position Feedback Over an RF Link  

E-Print Network [OSTI]

feedback control. The wireless scheme pre- cludes the need for the cable that feeds the position from the performance of the motor control system. As such, the feedback cable is shielded and the signals are provided in differential form, which increases the sensing cost. Therefore, motor-drive manufacturers have been focusing

Mazumder, Sudip K.

246

Numerical-experimental comparison in the simulation of rotor/stator interaction through blade-tip/abradable coating contact  

E-Print Network [OSTI]

-Cramayel, France Abstract Higher aircraft energy efficiency may be achieved by minimizing the clearance be- tween K plastic modulus T,int interaction rotational period Structural Dynamics & Vibration Laboratory 1

Paris-Sud XI, Université de

247

Two rotary motors in F-ATP synthase are elastically coupled by a flexible rotor and a stiff stator stalk  

Science Journals Connector (OSTI)

...Biology, University of Florida, Gainesville, FL...ATP, the universal fuel of the cell, from...kJ/mol elastic energy to smooth the cooperation...The rotation rate was 0.107 rev/s...at a given frame rate, are averaged over...system, the frame rate was 25 s-1...

André Wächter; Yumin Bi; Stanley D. Dunn; Brian D. Cain; Hendrik Sielaff; Frank Wintermann; Siegfried Engelbrecht; Wolfgang Junge

2011-01-01T23:59:59.000Z

248

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

249

Autonomous Autorotation of an RC Helicopter Pieter Abbeel1  

E-Print Network [OSTI]

, during autorotation the rotor drag is overcome by the airflow through the blades. Effectively the ground with too low a main rotor speed then the main rotor blades will flex sharply downward. This can result in one of the rotor blades striking the tailboom, destroying both that rotor blade

Bejerano, Gill

250

EXPERIMENTAL INVESTIGATIONS ON THE DESIGN OF A DUCTED COUNTER-ROTATING AXIAL FLOW FANS SYSTEM  

E-Print Network [OSTI]

[] Number of blades FR [] Front rotor R [mm] Blade radius RR [] Rear rotor CRS [] Counter-rotating system W to a conventional rotor or to a rotor-stator stage. The study of the variation of the rotation rates ratio show of the axial distance be- tween rotors does not seem to change the overall per- formances. This system has thus

Boyer, Edmond

251

I. INTRODUCTION Abstract--A genetic algorithm (GA) presents an excellent  

E-Print Network [OSTI]

the rotor blades' plane angles. The weight of the helicopter in its original state is approximately 210 with rather large helicopters with a rotor span of more than a meter [2], up to rotor spans of over 3 meters small indoor model helicopter. It is a coaxial rotor helicopter with twin counter-rotating rotors (it

Hopgood, Adrian

252

Rotorblätter  

Science Journals Connector (OSTI)

Der Rotor einer Windkraftanlage schließt — vom Standpunkt des konstruktiven Aufbaus aus betrachtet — mehrere Teilsysteme ein. Ausgehend von der Definition, daß der Rotor alle drehenden Teile der Anlage außerha...

Dipl.-Ing. Erich Hau

2003-01-01T23:59:59.000Z

253

Rotorblätter  

Science Journals Connector (OSTI)

Der Rotor einer Windkraftanlage schließt vom Standpunkt des konstruktiven Aufbaus mehrere Teilsysteme ein. Ausgehend von der Definition, daß der Rotor alle drehenden Teile der Anlage außerhalb des Maschinenhau...

Dipl.-Ing. Erich Hau

1996-01-01T23:59:59.000Z

254

Rotorblätter  

Science Journals Connector (OSTI)

Der Rotor einer Windkraftanlage schließt vom Standpunkt des konstruktiven Aufbaus mehrere Teilsysteme ein. Ausgehend von der Definition, daß der Rotor alle drehenden Teile der Anlage außerhalb des Maschinenhau...

Dipl.-Ing. Erich Hau

1988-01-01T23:59:59.000Z

255

IGUS Innovative Technische Systeme | Open Energy Information  

Open Energy Info (EERE)

The company produces systems for monitoring the condition of rotor blades in wind turbines, including diagnosing the formation of ice on the rotor blades. References: IGUS...

256

Sandia National Laboratories: Offshore Wind RD&D: Large Offshore...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Large Offshore Rotor Development Offshore Wind RD&D: Large Offshore Rotor Development Overview Sandia National Laboratories Wind Energy Technologies Department, creates and...

257

Development of Monitoring and Control System for Switched Reluctance Motor Drive System.  

E-Print Network [OSTI]

??The reluctance torque of switched reluctance motor could drive the rotor directly. Rotor doesnât need to be made from permanent magnet and the demagnetization and… (more)

Wang, Yung-chin

2005-01-01T23:59:59.000Z

258

Sandia National Laboratories: NRT  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

National Rotor Testbed (NRT) includes research to quantify the degree to which the blade design load distribution influences the rotor near- and mid-wake velocity deficits and...

259

Sandia National Laboratories: SAND2014-4644P  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

National Rotor Testbed (NRT) includes research to quantify the degree to which the blade design load distribution influences the rotor near- and mid-wake velocity deficits and...

260

Measurements of leakage, power loss and rotordynamic force coefficients in a hybrid brush seal  

E-Print Network [OSTI]

This thesis presents measurements of power loss and leakage in a hybrid brush seal (HBS) for increasing pressure differentials and over a range of rotor speeds. The test HBS, Haynes-25 bristle pack [~850 bristles/cm] and 45o lay angle, is 166.4 mm...

Baker, Jose Enrique

2009-05-15T23:59:59.000Z

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

Real-Time Fuzzy Control of Sensorless PM Drive Systems Dr. Kasim M. Al-Aubidy  

E-Print Network [OSTI]

oscillator controls the motor speed. The other mode is the closed-loop mode, in which the inverter power is essential for controlling the power devices of the inverter. The main problem with present rotor position without the new trends in softcomputing. There is a lot of literature on the design of AC drive systems

262

Fuzzy logic control implementation in sensorless PM drive systems  

E-Print Network [OSTI]

is essential for controlling the power devices of the inverter. The main problem with present rotor position be difficult to implement without the new trends in softcomputing. There is a lot of literature on the design an independent oscillator controls the motor speed. The other mode is the closed-loop mode, in which the inverter

263

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

264

Wind Turbine Blade Test Definition of the DeWind DW90 Rotor Blade: Cooperative Research and Development Final Report, CRADA Number CRD-09-326  

SciTech Connect (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

265

An AChBKr315M2BU3 induction variable-frequency electric motor with a squirrel-cage rotor  

Science Journals Connector (OSTI)

Information about a variable-frequency electric motor designed and manufactured by OAO NIPTIEM is presented. The motor is intended for use as a starter motor for the GTU-8 gas turbine power...

M. F. Zapadnya; O. V. Martynov; S. V. Piskunov…

2007-06-01T23:59:59.000Z

266

Backward Precessional Whip and Whirl for a Two Point Rubbing Contact Model of a Rigid Rotor Supported by an Elastically Supported Rigid Stator  

E-Print Network [OSTI]

friction whip and whirl at the two bushing contacts. To analyze the behavior, a mathematical model similar to the anemometer is developed and analyzed assuming two possible solutions, Mode1 (normal reaction forces in phase at two contacts) and Mode 2...

Kumar, Dhruv Dileep

2011-10-21T23:59:59.000Z

267

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

E-Print Network [OSTI]

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...

Blake, Sarah Anne

2009-05-15T23:59:59.000Z

268

Continuously variable transmission  

SciTech Connect (OSTI)

This patent describes a power transmission apparatus. It comprises: a body, a pinion gear, a cam means, first and second gear rack pairs, preventing means;l first and second rack support means, a rotor mounted for rotation about a rotor axis, the rotor having rotor engaging means for engaging the rack support means so as to transmit power therebetween.

Irvin, P.J.E.

1992-07-14T23:59:59.000Z

269

GENERAL THEORY OF COUPLED THERMALLY STABLE ANISOTROPIC LAMINATES  

E-Print Network [OSTI]

of rotor blades of helicopters or of wind-mills. Usually, structural composite laminates are obtained

Paris-Sud XI, Université de

270

This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 11890  

E-Print Network [OSTI]

efficiency Q torque of rotor R radius of rotor freestream fluid density blade solidity [ ] T thrust, Guirong Evaluation of nano-scale rotors and motors at static condition. (2013) International Journal-scale rotors and motors at static condition Zhen Liu1a, Longlei Dong1b, Jean-Marc Moschetta2c, Jianping Zhao1d

Mailhes, Corinne

271

Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature  

DOE Patents [OSTI]

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

272

New membranes could speed the biofuels conversion process and reduce cost  

SciTech Connect (OSTI)

ORNL researchers have developed a new class of membranes that could enable faster, more cost efficient biofuels production. These membranes are tunable at the nanopore level and have potential uses in separating water from fuel and acid from bio-oils. The membrane materials technology just won an R&D 100 award. ORNL and NREL are partnering, with support from the DOE Bioenergy Technologies Office, to determine the best uses of these membranes to speed the biofuels conversion process. Development of the membranes was funded by DOE BETO and ORNL's Laboratory Directed Research and Development Program.

Hu, Michael

2014-07-23T23:59:59.000Z

273

New membranes could speed the biofuels conversion process and reduce cost  

ScienceCinema (OSTI)

ORNL researchers have developed a new class of membranes that could enable faster, more cost efficient biofuels production. These membranes are tunable at the nanopore level and have potential uses in separating water from fuel and acid from bio-oils. The membrane materials technology just won an R&D 100 award. ORNL and NREL are partnering, with support from the DOE Bioenergy Technologies Office, to determine the best uses of these membranes to speed the biofuels conversion process. Development of the membranes was funded by DOE BETO and ORNL's Laboratory Directed Research and Development Program.

Hu, Michael

2014-08-06T23:59:59.000Z

274

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

275

Dynamic modeling and optimal control of DFIG wind energy systems using DFT and NSGA-II  

Science Journals Connector (OSTI)

Abstract Once a doubly-fed induction generator (DFIG) is subjected to a disturbance by a change in the wind speed, the stator flux cannot change instantly. Under this condition, rotor back-EMF voltages reflect the effects of stator dynamics on rotor current dynamics, and have an important role on the oscillations of the rotor current. These oscillations decrease the DFIG system reliability and gear lifetime. Moreover, by focusing only on small signal analysis, the dynamic damping performance immediately following such disturbances is often degraded. Additional improvement in performance will be achieved if discrete Fourier transform (DFT) is used to quantify damping characteristic of the rotor current during changes of the operating points. This paper introduces an optimization technique based on non-dominated sorting genetic algorithm-II (NSGA-II) incorporating DFT analysis to achieve better control performance for DFIG system stability. Considering small signal stability, the main purpose of the control system in the present paper is to increase the system damping ratio as well as to guarantee enough stability margin. Eigenvalue analysis and time-domain simulations have been presented to demonstrate that the proposed optimizing method yields better control performance in comparison with one designed using mere eigenvalue relocation.

M. Zamanifar; B. Fani; M.E.H. Golshan; H.R. Karshenas

2014-01-01T23:59:59.000Z

276

A power control strategy for flywheel doubly-fed induction machine storage system using artificial neural network  

Science Journals Connector (OSTI)

A large-capacity low-speed flywheel energy storage system (FESS) based on a doubly-fed induction machine (DFIM) consists of a wound-rotor induction machine and a back-to-back converter rated at 30–35% of the machine power rating used for rotor excitation. This system has been promoted as a viable mean of energy storage for power system applications as grid frequency support/control, uninterruptible power supply (UPS), power conditioning, and voltage sag mitigation. This paper presents a simple power control strategy based on artificial neural networks (ANN) to charge/discharge a flywheel DFIM (FW-DFIM) storage system while maintaining controllable grid side power. The proposed controller is based on conventional vector control system supplemented by an ANN-based current decoupling network used to develop the required rotor current components based on the required grid power level and flywheel instantaneous speed. The controller is designed to avoid overloading both stator and rotor circuits while the flywheel is charged/discharged. Additionally, it avoids using the required outer power loop or a hysteresis power controller, hence, simplifies the overall control algorithm. The validity of the developed concept along with the effectiveness and viability of the control strategy in power system applications is confirmed by computer simulation using Matlab/Simulink for a medium voltage 1000hp FW-DFIM. The simulation study is carried out for uninterruptible power supply (UPS) applications and power leveling to improve the quality of electric power delivered by wind generators.

A. Abdel-Khalik; A. Elserougi; A. Massoud; S. Ahmed

2013-01-01T23:59:59.000Z

277

Rotorblätter  

Science Journals Connector (OSTI)

Der Rotor einer Windkraftanlage umfaßt – vom Standpunkt des konstruktiven Aufbaus aus betrachtet – mehrere Teilsysteme. Ausgehend von der Definition, daß man unter dem Rotor alle drehenden Teile der Anlage auß...

2008-01-01T23:59:59.000Z

278

How Does a Wind Turbine Work?  

Broader source: Energy.gov [DOE]

Wind turbines operate on a simple principle. This animation shows how energy in the wind turns two or three propeller-like blades around a rotor. The rotor is connected to the main shaft, which...

279

How Does a Wind Turbine Work?  

Broader source: Energy.gov [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...

280

REQUEST BY SCHWITZER U.S., INC., FOR AN ADVANCE WAIVER OF DOMESTIC...  

Broader source: Energy.gov (indexed) [DOE]

and shafts. KICC has in turn entered into a sub-subcontract with Schwitzer for the aerodynamic design of the turbine rotor, the mechanical design of the rotor and shaft to which...

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

Ris-R-1261(EN) Fatigue Degradation and Failure of  

E-Print Network [OSTI]

. Such applications are for instance rotor blades in wind turbines, helicopter rotor blades, flywheels for energy storage, marine and aeronautical propellers, and rolls for paper machines. The purpose is to identify

282

B-19TO ORDER, CALL 1-800-522-SPIN (7746) and Accessories  

E-Print Network [OSTI]

......................................................................................... B-63 SUPERSPEED Rotor Warranty and References ................. B-64 Registered to ISO 9001 since versatility, rotor selection and sample volumes. Registered to ISO 9001 since 1993. SORVALL® products meet

Pawlowski, Wojtek

283

Sandia National Laboratories: Innovative Offshore Vertical-Axis...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

WindInnovative Offshore Vertical-Axis Wind Turbine Rotors Innovative Offshore Vertical-Axis Wind Turbine Rotors This project seeks to advance large offshore vertical-axis wind...

284

Performance analysis of synchronous machines under dynamic eccentricity  

E-Print Network [OSTI]

The performance of salient pole synchronous machines under eccentric rotors is studied. Relationships between stator and rotor current induced harmonics and dynamic eccentricity are investigated. The winding function theory has been modified...

Al-Nuaim, Nabil Abdulaziz

2012-06-07T23:59:59.000Z

285

Experiments to model the rotordynamic behavior of rub rings and bumpers  

E-Print Network [OSTI]

Rub-impact between rotors and stators is a widely studied phenomenon due to its deleterious effects on rotating machinery. When large amplitudes of vibration are developed in rotors due to either imbalance or triggered instabilities, the possibility...

Aguilar-Armendariz, Eduardo

2012-06-07T23:59:59.000Z

286

Analysis of flexure pivot tilting pad gas bearings with different damper configurations  

E-Print Network [OSTI]

after seizure occurred while running at 120+ krpm for extended period. (a) Localized heating and micro-welding on circumference of rotor within ?Front? bearing (inset shows magnified view of damaged region). (b) Undamaged rotor within ?Rear...

Rimpel, Aaron Michael

2009-05-15T23:59:59.000Z

287

The effects of preswirl on flow through centered and eccentric annular seals  

E-Print Network [OSTI]

accelerations, mean accelerations, and turbulent kinetic energy are presented. Among the main findings are a diffusion of axial momentum toward the rotor, a journal bearing type pressure field which causes migration of axial momentum around the rotor, and axial...

Shresta, Sanjiv

1993-01-01T23:59:59.000Z

288

Energies 2009, 2, 307-319; doi:10.3390/en20200307 ISSN 1996-1073  

E-Print Network [OSTI]

to the surface with a tether. In the design proposed by Sky Windpower (Figure 1b), four rotors are mounted

289

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

290

MATERIALS AND MOLECULAR RESEARCH DIVISION. ANNUAL REPORT 1978  

E-Print Network [OSTI]

Chang and D. H. Klalm Hydrogen embrittlement of metals is anthe resistance to hydrogen embrittlement because the rotor

Authors, Various

2011-01-01T23:59:59.000Z

291

RIS0-M-2531 S DESIGN BASIS FOR SMALL TO MEDIUM SIZE DANISH WINDMILLS  

E-Print Network [OSTI]

-called Danish windmill concept, i.e. the three-bladed, fixed-pitch upwind rotor dual-induction generator

292

WSEAS TRANS. ON INFORMATION SCIENCE & APPLICATIONS Issue 5, Volume 2, May 2005 ISSN: 1790-0832 587 Optimization Algorithms Inspired by Electromagnetism and Stigmergy  

E-Print Network [OSTI]

electric motor rotor/stator geometry. The design goal was to minimize the power losses. The output of an electric motor can be defined as follows: . addFeCuout out inp out PPPP P P P +++ == (1) 2.2 Rotor AC or DC motor rotor/stator geometries where the primary objective is to minimize the motor power

Silc, Jurij

293

Iowa State University Digital Repository @ Iowa State University  

E-Print Network [OSTI]

of a rotor [36]. According to the momentum source approach, which was first applied to vertical axis wind no apriori assumption about the wake structure and the need for a body-fitted rotor grid is also eliminated are determined using the currently available velocity field. The question of where and how to add this rotor

McCalley, James D.

294

This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 6520  

E-Print Network [OSTI]

, minimum energy loss, low Reynolds number, optimum propeller/rotor blades, passively adaptive blades, long concept is inapplicable for small-sized rotor (blade ~3mm of thickness) due to its complexity-Marc Design of Optimum Torsionally Flexible PropRotors for Tilt-Body MAVs. (2012) Applied Mechanics

Mailhes, Corinne

295

Advances in Applied Clifford Algebras Boosted Surfaces: Synthesis of 3D Meshes using Point Pair Generators in the  

E-Print Network [OSTI]

, and the interpolation of point pairs. Applying these rotors to points and circles provides an novel and efficient basis algebra can be leveraged as generators of "simple" orbit-inducing rotors. In the current work, null point of points, and the interpolation of point pairs. Applying these rotors to points and circles provides

California at Santa Barbara, University of

296

JOURNAL OF PROPULSION AND POWER Vol. 9, No. 4, July-Aug. 1993  

E-Print Network [OSTI]

the rotor blades which is a function of the rotor circumferential position. This, in turn, results study show that the magnitude of this effect is a strong function of rotor-stator blade row spacingJOURNAL OF PROPULSION AND POWER Vol. 9, No. 4, July-Aug. 1993 Blade Row Interaction Effects

Giles, Mike

297

This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 11897  

E-Print Network [OSTI]

, Guirong Optimization of Nano-Rotor Blade Airfoil Usinf Controlled Elitist NSGA-II. (2014) International Optimization of Nano-Rotor Blade Airfoil Using Controlled Elitist NSGA-II Zhen Liu1a, Longlei Dong1b, Jean. Nano rotor blade airfoil optimization is a multi-objective problem since the airfoil suffers a wide

Mailhes, Corinne

298

This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 8076  

E-Print Network [OSTI]

reveals a complex evolution of critical zones and the existence of bifurcation points at low rotor speed Units a Rotor eccentricity m b Blade equivalent length m [c.c.] Complex conjugate terms D p n p Tp n matrix of the dynamical system Nb Number of blades in the rotor P (, ) Characteristic polynomial equation

Mailhes, Corinne

299

Heading: Georgia bold 24-28pt Response surface method based design optimisation  

E-Print Network [OSTI]

data was sampled at the 280 training DoE points, whilst a random subset of 28 fine mesh data was used the use of innovative computer-based simulation systems. NASA compressor rotor 37 3D geometry optimisation test case The NASA rotor 37 is a transonic rotor for which experimental and CFD analysis has been

Sóbester, András

300

Proceedings of the 26th Chinese Control Conference  

E-Print Network [OSTI]

, the flight dynamics equations for a four rotor aircraft with fixed pitch blades are considered. The purpose the trajectory tracking problem for a four rotor aircraft. After introducing simplifying assumptions, the flight dynamics equations for the four rotor aircraft are considered. A trajectory tracking control structure

Boyer, Edmond

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

NEW COMPUTATIONAL METHODS FOR THE PREDICTION AND ANALYSIS OF HELICOPTER ACOUSTICS \\Lambda  

E-Print Network [OSTI]

numbers greater than 0.9. The sec­ ond type of noise comes from the interaction of the rotor blades the causes of the offending noise. The third requirement is a way to alter the rotor blade motion. These near­field solutions are then interpo­ lated onto a surface that completely encloses the rotor blades

302

Rotorcraft Trajectory Tracking by Supervised NLI Control  

E-Print Network [OSTI]

for a four rotor aircraft with fixed pitch blades, or rotorcraft, are considered. One important limitation tracking by a four rotor aircraft is considered. After introducing the flight dynamics equations for the four rotor aircraft, a trajectory tracking control structure based on a two layer non linear inverse

Boyer, Edmond

303

Florian Poppa and Uwe Zimmer The Australian National University  

E-Print Network [OSTI]

the rotor blades did not negatively influence the measurements. A clear jump can be seen when the helicopter rotor blades resulted in each consecutive CO2 spike having a smaller CO2 concentration than-wash of the main rotor mixes up the air-CO2-mixture and pushes it through the CO2 sensor mounted in the front

Zimmer, Uwe

304

High-Resolution Simulations of Parallel BladeVortex Interactions  

E-Print Network [OSTI]

= perturbation pressure coefficient, p ps= 1 2 1U2 1 c = rotor blade chord p = instantaneous airfoil surface­vortex interaction computations Introduction A MAJOR source of rotorcraft noise is generated by the rotor blades on the rotor blades. BVI noise is especially important because it is known to propagate out

Alonso, Juan J.

305

Accounting for rotation in a multi-stage cyclo-symmetric model -a case study  

E-Print Network [OSTI]

. Real rotors are assemblies of stages that have different number of sectors. This mo- tivated predictions of full rotor dynamics. The present paper summarizes the theory and shows that this new ability-symmetric geometries. Classically cyclic-symmetry [1, 2] considers single stage vibration or assumes the whole rotor

Boyer, Edmond

306

To cite this document: Mohd-Zawawi, Fazila and Prothin, Sebastien and Lv, Peng and Benard, Emmanuel and Moschetta, Jean-Marc and Morlier, Joseph Study of a Flexible  

E-Print Network [OSTI]

capable of providing a predictive and reliable data in blade geometry and performance for rotor modes. 1 blade twist control method for conventional proprotor of tilt-rotor aircraft using extension twist in fatigue performance and damage tolerance of the blade. Additionally, the difference in rotor speeds

Mailhes, Corinne

307

Vortex Jitter in Hover Swathi M. Mula  

E-Print Network [OSTI]

78712, USA Abstract The trajectory of the tip vortex of a reduced-scale, 1 m diameter, four-bladed rotor condition of the rotor is at a blade loading of CT / = 0.0645 and a rotational speed of 1240RPM wake dominated by the tip vortices shed from the rotor blades. The complexity of the flow

Tinney, Charles E.

308

Design and Experimental Validation of a Ducted Counter-rotating Axial-flow Fans System  

E-Print Network [OSTI]

,8 ) than the front rotor (FR) diameter to re- duce interaction between the FR tip vortex and the RR blade that the efficiency is strongly increased compared to a conventional rotor or to a rotor-stator stage. The effects a very flexible use, with a large patch of high efficient operating points in the parameter space

Boyer, Edmond

309

Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@inp-toulouse.fr  

E-Print Network [OSTI]

present in the rotor. The temporal response analysis in the motion of helicopter with one asymmetric blade for isotropic and anisotropic multibladed rotor configurations. Mechanism and Machine Theory, vol. 46, n° 8, pp. 1054-1065. ISSN 0094-114X #12;Instability zones for isotropic and anisotropic multibladed rotor

Mailhes, Corinne

310

Proceedings of Proceedings of the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting and 11th International Conference on Nanochannels,  

E-Print Network [OSTI]

between the rotors. Three counter-rotating fans, which have the same design point, have been designed(mm) Rhub Blade hub radius (mm) N Rotational speed of rotor (rpm) Rotational speed ratio NRR NFR L Distribution of load Pt,RR Pt,FR+Pt,RR Z Number of blades Pw Power consumption of the rotor (W) Zp Axial

Paris-Sud XI, Université de

311

Numerical Investigation of Flow Fields and Forces for 2-D Squeeze Film Dampers  

E-Print Network [OSTI]

equations. Lubell and San Andr?s [7] presented a test apparatus and 3 measurements of the imbalance response of the rotor-bearing system supported on squeeze film dampers. It was found that synchronous rotor response of a rotor-bearing system...

Neadkratoke, Terdsak

2011-08-08T23:59:59.000Z

312

REVIEW Open Access Environment-sensitive behavior of fluorescent  

E-Print Network [OSTI]

REVIEW Open Access Environment-sensitive behavior of fluorescent molecular rotors Mark A Haidekker1 and the molecular-scale interaction of a molecular rotor with its environment are not fully understood. This review rotors as microviscosity sensors are reviewed, and engineering aspects are presented on how measurement

Theodorakis, Emmanuel

313

REVSTAT Statistical Journal Volume 11, Number 1, March 2013, 4565  

E-Print Network [OSTI]

has been concerned with the shut-downs made by the Turbo- Expander equipment in the FCC unit (Fluid in order to detect scaling deposition in expander rotor blades. It is believed that the com- position turnaround, the procedure of changing the expander's rotor and shroud was not complete. Only the rotor

Alves, Maria Isabel Fraga

314

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

315

The concept of new-generation steam turbines for the coal power engineering of Russia. Part 2. Substantiating the long-term strength of the steam turbine’s high-temperature rotors  

Science Journals Connector (OSTI)

The possibility of constructing a K-660-30 two-cylinder steam turbine for ultrasupercritical steam conditions with reheating, the ... is substantiated. It is shown that this turbine can be constructed using the a...

A. G. Kostyuk; V. G. Gribin; A. D. Trukhnii

2011-01-01T23:59:59.000Z

316

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

317

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

318

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

319

Enertech 2-kW high-reliability wind system. Phase II. Fabrication and testing  

SciTech Connect (OSTI)

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

320

Gas turbine power plant with supersonic shock compression ramps  

DOE Patents [OSTI]

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

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

Supersonic gas compressor  

DOE Patents [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

322

Design guidelines for H-Darrieus wind turbines: Optimization of the annual energy yield  

Science Journals Connector (OSTI)

Abstract H-Darrieus wind turbines are gaining popularity in the wind energy market, particularly as they are thought to represent a suitable solution even in unconventional installation areas. To promote the diffusion of this technology, industrial manufacturers are continuously proposing new and appealing exterior solutions, coupled with tempting rated-power offers. The actual operating conditions of a rotor over a year can be, however, very different from the nominal one and strictly dependent on the features of the installation site. Based on these considerations, a turbine optimization oriented to maximize the annual energy yield, instead of the maximum power, is thought to represent a more interesting solution. With this goal in mind, 21,600 test cases of H-Darrieus rotors were compared on the basis of their energy-yield capabilities for different annual wind distributions in terms of average speed. The wind distributions were combined with the predicted performance maps of the rotors obtained with a specifically developed numerical code based on a Blade Element Momentum (BEM) approach. The influence on turbine performance of the cut-in speed was accounted for, as well as the limitations due to structural loads (i.e. maximum rotational speed and maximum wind velocity). The analysis, carried out in terms of dimensionless parameters, highlighted the aerodynamic configurations able to ensure the largest annual energy yield for each wind distribution and set of aerodynamic constraints.

Alessandro Bianchini; Giovanni Ferrara; Lorenzo Ferrari

2015-01-01T23:59:59.000Z

323

Detailed design, fabrication and testing of an engineering prototype compensated pulsed alternator. Final report  

SciTech Connect (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

324

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

325

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

326

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

327

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

328

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

329

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

330

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

331

R and D for improved efficiency small steam turbines. Phase II. Second quarterly technical report  

SciTech Connect (OSTI)

The detailed design of a radial inflow steam turbine (RIT) comprised of two radial inflow turbine stages driving a common bull gear/output shaft designed for rated speeds of 70,000 rpm and 52,500 rpm, respectively, is described. Details are presented on: aerodynamic design; high speed rotors; high speed rotor bearings; high speed rotor sealing; gearing; output shaft; static structure; and predicted performance. (MCW)

Not Available

1981-03-01T23:59:59.000Z

332

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

333

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

334

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

335

Aeroelastic simulation of wind turbine blades  

Science Journals Connector (OSTI)

The aim of this chapter is to compute dynamic stresses acting on wind turbine blades. These stresses are essential in predicting fatigue of the rotor.

Z.L. Mahri; M.S. Rouabah; Z. Said

2009-01-01T23:59:59.000Z

336

Wind Powering America Webinar: Wind Power Economics: Past, Present...  

Broader source: Energy.gov (indexed) [DOE]

after doubling from 2002 through 2008. Over this entire period, the average nameplate capacity rating, hub height, and rotor swept area of turbines installed in the United States...

337

Sandia National Laboratories: International Electrotechnical...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

anemometer towers have been installed 2.5 rotor diameters upstream of the first row of wind turbines. When fully instrumented, these towers will provide both the industry...

338

WP2 IEA Wind Task 26:The Past and Future Cost of Wind Energy  

E-Print Network [OSTI]

does not improve turbine efficiency. However, by increasingin Specific Turbine Systems Efficiency (Siting & Turbine)from increased turbine or rotor efficiency but rather from

Lantz, Eric

2014-01-01T23:59:59.000Z

339

2008 Annual Merit Review Results Summary - 18. Cross-Reference...  

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

Livermore National Laboratory) -- LLNL APBF Fuels Technologies 5-34 Adams, Don (Oak Ridge National Laboratory) -- Uncluttered Rotor PM Machine, Axially Excited...

340

Sandia National Laboratories: New Facility Tool at SWiFT Makes...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Updated New Facility Tool at SWiFT Makes Rotor Work More Efficient On January 22, 2014, in Energy, Facilities, News, News & Events, Partnership, Renewable Energy, SWIFT,...

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

Key Activities in Wind Energy | Department of Energy  

Office of Environmental Management (EM)

to develop aerodynamic, structural and electrical test centers for wind farms, wind turbines, rotor blades, and drivetrains Enable industry to meet performance and safety...

342

E-Print Network 3.0 - advanced energy research Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Van Kuik... in the DUWIND research institute and his designs for advanced, smart wind turbines. Smart rotor professor... on advanced wind turbines. According to EAWE president...

343

L L Rotorservice | Open Energy Information  

Open Energy Info (EERE)

Rotorservice Jump to: navigation, search Name: L&L Rotorservice Place: Basdahl, Germany Zip: 27432 Sector: Wind energy Product: Wind turbine tower and rotor blade repair, servicing...

344

E-Print Network 3.0 - airframes Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2 Presented at the AHS National Forum in 1989. Prediction and Measurement of the Aerodynamic Interactions Between a Summary: Interactions Between a Rotor and Airframe Komerath,...

345

COMMUNICATIONS IN COMPUTATIONAL PHYSICS Vol. 2, No. 6, pp. 1095-1124  

E-Print Network [OSTI]

control surfaces, helicopter rotor blades, compressor and turbine blades, stage separation in launch vehicles, and the combustion interface in solid propellant rocket motors. Numerical solution

Groth, Clinton P. T.

346

Electric motor with controllable speed and torque  

Science Journals Connector (OSTI)

The proposed electric motor is characterized by controllable speed and torque ... shaft, at constant rotor speed. In this motor, the torque at the output shaft increases...

R. G. Khadeev

2011-01-01T23:59:59.000Z

347

REQUEST BY THE GENERAL ELECTRIC COMPANY FOR AN ADVANCE WAIVER...  

Broader source: Energy.gov (indexed) [DOE]

work involves the design, manufacture, and mechanical balance of a prototype rotor for an electric power generator or motor using a construction that encloses prefabricated winding...

348

Sandia National Laboratories: Conventional Water Power: Technology...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sediment Transport High-Resolution Computational Algorithms for Simulating Offshore Wind Farms Innovative Offshore Vertical-Axis Wind Turbine Rotors Offshore Publications...

349

Sandia National Laboratories: WEC-Sim (Wave Energy Converter...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sediment Transport High-Resolution Computational Algorithms for Simulating Offshore Wind Farms Innovative Offshore Vertical-Axis Wind Turbine Rotors Offshore Publications...

350

Sandia National Laboratories: Conventional Water Power: Market...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sediment Transport High-Resolution Computational Algorithms for Simulating Offshore Wind Farms Innovative Offshore Vertical-Axis Wind Turbine Rotors Offshore Publications...

351

Sandia National Laboratories: TTU Advanced Doppler Radar  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sediment Transport High-Resolution Computational Algorithms for Simulating Offshore Wind Farms Innovative Offshore Vertical-Axis Wind Turbine Rotors Offshore Publications...

352

Unsteady Turbomachinery Computations Using Massively Parallel Platforms  

E-Print Network [OSTI]

Unsteady Turbomachinery Computations Using Massively Parallel Platforms Edwin van der Weide with the inherently unsteady nature of turbomachinery flows, due to the motion of the rotors, this means

Alonso, Juan J.

353

Sandia National Laboratories: Computational Fluid Dynamics Simulations...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Canal, Yakima Washington Sandia Publishes Five Reports on the Environmental Effects of Wave-Energy Converters Computational Fluid Dynamics Simulations Provide Insight for Rotor...

354

MOLYBDENUM-SUBSTRATE INTERACTIONS IN NITROGENASE: AN EXAFS STUDY  

E-Print Network [OSTI]

in the Sorvall GSA rotor Fracture ce 11 s; Suspend in DTRISat room temperature. C. Cell Fracture Procedure Azotobacterthe course of the cell fracture procedure were occasionally

Smith, Joseph Patrick

2011-01-01T23:59:59.000Z

355

Non-contact gas turbine blade vibration monitoring using internal pressure and casing response measurements.  

E-Print Network [OSTI]

??This thesis addresses the non-contact measurement of rotor blade vibrations in gas turbines. Specifically, use is made of internal casing wall pressure, and external casing… (more)

Forbes, Gareth Llewellyn

2010-01-01T23:59:59.000Z

356

E-Print Network 3.0 - arc blade type Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

NASA Langley Research Center Collection: Engineering 8 Sparkr Blade Test Centre Wind turbines with a rotor diameter exceed- Summary: Sparkr Blade Test Centre Wind...

357

Utveckling av dataanalysprogram för Opcon Powerbox; Development of data analysis software for Opcon Powerbox.  

E-Print Network [OSTI]

?? Opcon Powerbox is a product developed by Opcon together with the underlying company SRM (Svenska Rotor Maskiner) where surplus heat from the industry is… (more)

Holmgren, Magnus

2010-01-01T23:59:59.000Z

358

Darrieus vertical axis wind turbine for power generation I: Assessment of Darrieus VAWT configurations  

Science Journals Connector (OSTI)

Abstract This paper aims to assess the Darrieus vertical axis wind turbine (VAWT) configurations, including the drawbacks of each variation that hindered the development into large scale rotor. A comprehensive timeline is given as a lineage chart. The variations are assessed on the performance, components and operational reliability. In addition, current development and future prospects of Darrieus VAWT are presented. The Darrieus VAWT patented in France in 1925 and in the US in 1931 had two configurations: (i) curved blades and (ii) straight blades configurations. Curved blades configuration (egg-beater or phi-rotor) has evolved from the conventional guy-wires support into fixed-on-tower and cantilevered versions. Straight blades configuration used to have variable-geometry (Musgrove-rotor), variable-pitch (Giromill), Diamond, Delta and V/Y rotor variations. They were stopped due to low economical value, i.e. high specific cost of energy (COE). Musgrove-rotor has evolved into fixed-pitch straight-bladed H-rotor (referred as H-rotor in this paper for simplicity). H-rotor, in turn, has evolved into several variations: Articulating, Tilted and Helical H-rotors.

Willy Tjiu; Tjukup Marnoto; Sohif Mat; Mohd Hafidz Ruslan; Kamaruzzaman Sopian

2015-01-01T23:59:59.000Z

359

Real-time digital control of DFIG-based wind generators for grid support.  

E-Print Network [OSTI]

??In this thesis, a set of new converter /control techniques are developed for the Grid Side and Rotor Side converter applications in DFIG wind power… (more)

Mesbah, Mohsen

2012-01-01T23:59:59.000Z

360

WP2 IEA Wind Task 26:The Past and Future Cost of Wind Energy  

E-Print Network [OSTI]

Asíncrono NACELLE WEIGHT (t) DFIG Multipole Wound rotorSquirrel Cage Polinómica (DFIG) Polinómica (Multipole Woundduring the operation phase. DFIG Squirel cage Due to new

Lantz, Eric

2014-01-01T23:59:59.000Z

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

Sandia National Laboratories: Reference Model Project (RMP)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sediment Transport High-Resolution Computational Algorithms for Simulating Offshore Wind Farms Innovative Offshore Vertical-Axis Wind Turbine Rotors Offshore Publications...

362

A comparison of experimental and theoretical results for rotordynamic coefficients for labyrinth gas seals  

E-Print Network [OSTI]

. It provides answer s for the following questions: 1) How is the static position of the seal rotor controlled? 2) How is the dynamic motion of the rotor executed and contr oiled? 3) How is compressed air obtained and supplied to the apparatus, and how... is the pressure ratio acr oss the seal controlled? N) How is the incoming air prerotated before it enters the seal? 5) How are the seal rotor and stator mounted and replaced? 6) How is the seal rotor driven (rotated)? Recalling the rotordynamic...

Scharrer, Joseph Kirk

2012-06-07T23:59:59.000Z

363

Sandia National Laboratories: Wind Power  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Wind Energy Staff On March 24, 2011, in Wind Energy On November 10, 2010, in Wind Plant Opt. Rotor Innovation Materials, Reliability & Standards Siting & Barrier Mitigation...

364

Sandia National Laboratories: AIAA SciTech/American Society of...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AIAA SciTechAmerican Society of Mechanical Engineers Wind Energy Symposium National Rotor Testbed Functional Scaling Presented at American Institute of Aeronautics and...

365

Passive magnetic bearing for a motor-generator  

DOE Patents [OSTI]

Conductive lap windings are interleaved with conventional loops in the stator of a motor-generator. The rotor provides magnetic induction lines that, when rotated, cut across the lap windings and the loops. When the rotor is laterally displaced from its equilibrium axis of rotation, its magnetic lines of induction induce a current in the interleaved lap windings. The induced current interacts with the magnetic lines of induction of the rotor in accordance with Lenz's law to generate a radial force that returns the rotor to its equilibrium axis of rotation.

Post, Richard F. (Walnut Creek, CA)

2006-07-18T23:59:59.000Z

366

afe | netl.doe.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

- Kansas City Presentation Modeling Creep-Fatigue- Environment Interactions in Steam Turbine Rotor Materials for Advanced Ultrasupercritical Coal Power Plants Liang Jiang, GE...

367

Xinjiang Huitong Wind Equipment Co Ltd | Open Energy Information  

Open Energy Info (EERE)

Co Ltd Place: Xinjiang Autonomous Region, China Sector: Wind energy Product: A Chinese wind turbine component supplier, products inculde rotors, spindles and towers. References:...

368

Gateway:América Latina/Aprender más sobre las ERNC/Estudios...  

Open Energy Info (EERE)

Estudios de Ingeniera y Seleccin de EquiposEolica Jump to: navigation, search Wind turbine components Fuente: Vestas Idioma: Ingls Learn about the rotor Fuente: Vestas...

369

1112315-oscomp-abstract-hybrid-compressor | netl.doe.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Information Natural Gas Resources Enhanced Oil Recovery Deepwater Tech Methane Hydrate Hybrid Rotor Compression for Multiphase and Liquids-Rich Wellhead Production Applications...

370

E-Print Network 3.0 - activation induces close Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of Cell Biology, Yale University Collection: Biology and Medicine 78 RECENT ADVANCES IN SMART-MATERIAL ROTOR CONTROL ACTUATION. Victor Giurgiutiu*, Summary: and Astronautics,...

371

Simulation and modeling of flow field around a horizontal axis wind turbine (HAWT) using RANS method.  

E-Print Network [OSTI]

??The principal objective of the proposed CFD analysis is to investigate the flow field around a horizontal axis wind turbine rotor and calculate the turbine's… (more)

Sargsyan, Armen.

2010-01-01T23:59:59.000Z

372

Experimental investigation of hinged and spring loaded rolling piston compressors pertaining to a turbo rotary engine  

Science Journals Connector (OSTI)

Hinged rolling piston compressor of a new thermodynamic cycle Pars engine promises high performance figures such as single stage high compression levels and higher volume flow discharge with competitively low input power and torque. The pumping characteristic of the present engine compressor unit has been increased by the implementation of a spring less vane configuration. The reciprocating vane which is usually operated by spring compression in air conditioning and refrigeration unit has been replaced by a hinge vane mechanism. At high speeds, the conventional spring loaded vane which is forced against the eccentrically moving rotor periphery does disconnect and starts rocking. With the new configuration, this mishap has been eliminated and subsequently resulting compressor pressure leaks have been avoided. Compressor experiments have been carried out at predetermined rotor speeds and compressed volume flow amounts and required shaft powers have been measured and derived accordingly. Experimentally determined pressure–volume relations have been compared with isentropic, isothermal, isochoric compressions as well as isobaric process. It is seen that at lower speeds, hinged vane compression is half way between isentropic and isochoric compressions whereas at high speed the compression process approaches further isochoric compression behavior. The isentropic compression efficiency of the hinged vane compressor is around 85% for pressures reaching 9 atm.

Melih Okur; Ibrahim Sinan Akmandor

2011-01-01T23:59:59.000Z

373

25th AIAA Applied Aerodynamics Conference June 2528, 2007/Miami, FL  

E-Print Network [OSTI]

25th AIAA Applied Aerodynamics Conference June 25­28, 2007/Miami, FL Validation Study of Aerodynamic Analysis Tools for Design Optimization of Helicopter Rotors Seongim Choi , Juan J. Alonso , Edwin current aerodynamic analysis tools in predicting the unsteady flow field generated by helicopter rotors

Alonso, Juan J.

374

Section 6 Concluding Remarks 31 6. Concluding Remarks  

E-Print Network [OSTI]

and a rotor bearing R. The rotor consists of a permanent magnet P and a shaft S. Current I in the coil results permanent magnets and controlled by low cost microcontrollers. The motors have low friction, small size Figure 8). The finger joints are primitive permanent magnet DC motors consisting of a single stator coil

Mishra, Bud

375

SCIENCE CHINA Physics, Mechanics & Astronomy  

E-Print Network [OSTI]

wind farms vs. ~7 rotor diameters for offshore wind farms in the prevailing wind direction), especially to turbines in onshore wind farms due to the smaller turbine spacing (i.e., ~3 rotor diameters for onshore. To achieve the goal of 20% of electricity generation from wind energy by 2030, while more and more wind farms

Hu, Hui

376

Variations of Subunit ? of the Mycobacterium tuberculosis F1Fo ATP Synthase and a Novel Model for Mechanism of Action of the Tuberculosis Drug TMC207  

Science Journals Connector (OSTI)

...synthases, the rotor of the F1 motor and the rotor of the FO motor are generally considered to be...the rotary elements of the two motors FO and F1. As shown in Fig...to the discovery of TMC207. Future Med. Chem. 3 :1345-1360...

Goran Biukovi?; Sandip Basak; Malathy Sony Subramanian Manimekalai; Sankaranarayanan Rishikesan; Manfred Roessle; Thomas Dick; Srinivasa P. S. Rao; Cornelia Hunke; Gerhard Grüber

2012-10-22T23:59:59.000Z

377

Technische Universitt Berlin Institut fr Konstruktion, Mikro-und Medizintechnik  

E-Print Network [OSTI]

, kann dies, aufgrund der in Wärme dissipierten mechanischen Leistung, zu einem instabilen Verhalten des Rotors führen. Die Stabilitätsgrenze ist dabei von dem Anteil der Wärme abhängig, die in den Rotor

Berlin,Technische Universität

378

Magnetic Properties of Precession Modes Built on High-K Multi-quasiparticle States in ^{178}W  

E-Print Network [OSTI]

We present an example that shows that the random phase approximation performed on high-K multi-quasiparticle configurations leads to a rotor picture by calculating excitation energies and magnetic properties of ^{178}W. Then we deduce the effective g_R of the high-K rotors and compare it with that of the low-K one.

Masayuki Matsuzaki; Yoshifumi R. Shimizu

2004-12-03T23:59:59.000Z

379

Ris-R-1065(EN) Airfoil Characteristics for Wind Turbines  

E-Print Network [OSTI]

as input 3D CFD computations and wind tunnel measurements on a 41-m full-scale rotor with LM 19.1 blades rotor with LM 19.1 and LM 19.0 blades, respectively. The method requires measurements or CFD for use in the Blade Element Momentum (BEM) method are derived by use of systematic methods

380

94 Int. J. Engineering Systems Modelling and Simulation, Vol. 4, Nos. 1/2, 2012 Copyright 2012 Inderscience Enterprises Ltd.  

E-Print Network [OSTI]

of helical vortices such as those developing in the wake of propellers and wind turbine or helicopter rotors;Direct numerical simulation of helical vortices 95 1 Introduction Rotating devices such as propellers, wind turbines, helicopter rotors are known to develop a system of helical vortices in their wake

Delbende, Ivan

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

Experimental verification of bifurcation in fluid bearings  

E-Print Network [OSTI]

The thesis presents the results of the experiments that were conducted on short and long fluid film bearings with a simple single disk rotor. The behavior of the journal was analyzed as function of the rotor system parameters such as the load, speed...

Deepak, James Christopher

1997-01-01T23:59:59.000Z

382

Permanent magnet design for high-speed superconducting bearings  

DOE Patents [OSTI]

A high temperature superconducting bearing including a permanent magnet rotor levitated by a high temperature superconducting structure is disclosed. The rotor preferably includes one or more concentric permanent magnet rings coupled to permanent magnet ring structures having substantially triangular and quadrangular cross-sections. Both alternating and single direction polarity magnet structures can be used in the bearing. 9 figs.

Hull, J.R.; Uherka, K.L.; Abdoud, R.G.

1996-09-10T23:59:59.000Z

383

Review of fluid flow and convective heat transfer within rotating disk cavities  

E-Print Network [OSTI]

1 Review of fluid flow and convective heat transfer within rotating disk cavities with impinging axial direction #12;5 Introduction Fluid flow and convective heat transfer in rotor-stator configuration heat transfer in rotor-stator configurations, which are of great importance in different engineering

Paris-Sud XI, Université de

384

ExperimentalandNumericalInvestigationsontheFlowCharacteristicsofRotaryMachineries AerospaceEngineeringGraduatePreliminaryOralExam  

E-Print Network [OSTI]

performances and wake characteristics of innovative dual-rotor wind turbines (DRWTs) and conventional single (PIV) systems were used for detailed wake flow field measurements to quantify the flow characteristics-rotor wind turbine (SRWT). For the first topic, by using a commercially-available cooling fan as the baseline

Hu, Hui

385

Jet Ignition Research for Clean Efficient Combustion Engines Prasanna Chinnathambi, Abdullah Karimi, Manikanda Rajagopal, Razi Nalim  

E-Print Network [OSTI]

-chamber internal combustion engines and in innovative pressure-gain combustors for gas turbine engines. Jet engines using low-cost, low-carbon natural gas need improved methods for ignition of lean mixtures rotor combustor. A wave rotor combustion chamber is best ignited with a jet of hot gas that may come

Zhou, Yaoqi

386

Rotary magnetic heat pump  

DOE Patents [OSTI]

A rotary magnetic heat pump constructed without flow seals or segmented rotor accomplishes recuperation and regeneration by using split flow paths. Heat exchange fluid pumped through heat exchangers and returned to the heat pump splits into two flow components: one flowing counter to the rotor rotation and one flowing with the rotation. 5 figs.

Kirol, L.D.

1987-02-11T23:59:59.000Z

387

> FOR CONFERENCE-RELATED PAPERS, REPLACE THIS LINE WITH YOUR SESSION NUMBER, E.G., AB-02 (DOUBLE-CLICK HERE) Magnetic Field in Internal  

E-Print Network [OSTI]

-CLICK HERE) Magnetic Field in Internal and External Rotor model for the computation of magnetic field distribution in any number of stator slots and rotor poles on subdomain model for predicting magnetic field in any FSM topology with defining in advance the number

Boyer, Edmond

388

Laboratoire de Conception de Systmes Mcaniques Gnie mcanique  

E-Print Network [OSTI]

efficiency point, the frequency of the rotor-stator interaction is clearly perceived and an axi to the outlet of the draft tube have been performed in the normal operating range for the best efficiency point. At low discharge operating conditions, important instabilities appear near the rotor-stator interface due

Diggavi, Suhas

389

Master of Science Thesis Design, implementation and flight  

E-Print Network [OSTI]

to take off and land vertical, and that it is possible to hover at a fixed point. One very successful design for smaller UAVs is an helicopter with four horizontal rotors and no tailrotor, a such called quadrotor. Quadrotors have the advantage that they can be controlled by varying the speed of the rotors

Langendoen, Koen

390

June 2004 The Arabian Journal for Science and Engineering, Volume 29, Number 1C. 39 . (ANSYS)  

E-Print Network [OSTI]

that the main rotor torsional vibration can give the blades vibration signature. An experimental study to the basic understanding of the interaction of blades­rotor systems. Vibration measurement has been known) . . . . . SHAFT LATERAL AND TORSIONAL VIBRATION RESPONSES TO BLADE(S) RANDOM VIBRATION EXCITATION B.O. Al

Ghouti, Lahouari

391

To cite this document: Jhinaoui, Ahmed and Mevel, Laurent and Morlier, Joseph A CUSUM test with sliding reference for ground resonance monitoring. (2011)  

E-Print Network [OSTI]

of the rotor blades and the fuselage in-plane oscillations. Since the works of Coleman and Feingold [1 rotors when the aircraft is on or near the ground. Therefore, this unstable phenomenon has to be detected alternative which permits - at once- to avoid the system identification for each flight point and to have more

Mailhes, Corinne

392

AIAA 984811 American Institute of Aeronautics and Astronautics  

E-Print Network [OSTI]

) was used to generate, in a single run, a family of aerodynamically efficient, low­noise rotor blade designs on twenty design variables, which constitute the control points for a spline representing the airfoil­to­drag of a rotor airfoil shape and to minimize an overall noise measure including effects of loading and thickness

Coello, Carlos A. Coello

393

Learning to Rank Answers to Non-Factoid Questions from Web Collections  

E-Print Network [OSTI]

Q: How does a helicopter fly? Quality A: A helicopter gets its power from rotors or blades. So as the rotors turn, air flows more quickly over the tops of the blades than it does below. This creates enough #12;Computational Linguistics Volume 37, Number 2 Table 1 Sample content from Yahoo! Answers. High Q

Tomkins, Andrew

394

J. Phys. III France 2 (1992) 527-544 APRn~ 1992, PAGE 527 Classification  

E-Print Network [OSTI]

in the unsteady aerodynamics acting on the individual blades of a rotor. Consequently, the blades do not respond 47.30M 47.60 Analysis of forced response of detuned blade rows Hsiao-Wei. D. Chiang (*) and Sanford, structural, and combined aerodynamic-structural detuning of a loaded rotor operating in an incompressible

Boyer, Edmond

395

Reliable Sweeps Xinyu Zhang Young J. Kim  

E-Print Network [OSTI]

: Sweeping a Rotor. (a) a rotor blade in gray (generator, 4736 tris) under helical sweep to be docked adaptive sampling (right); (b) Zoomed-in views of our approximation (1.7M samples); (c) Zoomed-in views of approximation using Kim et al. [2003] and uniform sampling (2M samples). Notice the aliasing effect along

396

Estimation of Wind Speed in Connection to a Wind Turbine  

E-Print Network [OSTI]

horizontal axis wind power plant with rated power 750 KW. The plant has a three bladed rotor and an automatic is shown in Figure 1 demand Drive train Generator Rotor Wind speed Power demand Grid Power Controller PitchEstimation of Wind Speed in Connection to a Wind Turbine X. Ma #3; , N. K. Poulsen #3; , H. Bindner

397

Electromagnetic torque analysis of a DFIG for wind turbines  

Science Journals Connector (OSTI)

Electromagnetic torque of doubly fed induction generator (DFIG) is a consequence of the rotor and stator supply. The stator voltage has a fixed amount and frequency. The rotor voltage of the DFIG as a part of a wind turbine has a variable amount and ... Keywords: DFIG, electromagnetic torque, renewable energy, wind turbine

Jurica Smajo; Dinko Vukadinovic

2008-05-01T23:59:59.000Z

398

Hydrostatic bearings for a turbine fluid flow metering device  

DOE Patents [OSTI]

A rotor assembly fluid metering device has been improved by development of a hydrostatic bearing fluid system which provides bearing fluid at a common pressure to rotor assembly bearing surfaces. The bearing fluid distribution system produces a uniform film of fluid between bearing surfaces and allows rapid replacement of bearing fluid between bearing surfaces, thereby minimizing bearing wear and corrosion. 3 figs.

Fincke, J.R.

1982-05-04T23:59:59.000Z

399

Apparatus and methods for cooling and sealing rotary helical screw compressors  

DOE Patents [OSTI]

In a compression system which incorporates a rotary helical screw compressor, and for any type of gas or refrigerant, the working liquid oil is atomized through nozzles suspended in, and parallel to, the suction gas flow, or alternatively the nozzles are mounted on the suction piping. In either case, the aim is to create positively a homogeneous mixture of oil droplets to maximize the effectiveness of the working liquid oil in improving the isothermal and volumetric efficiencies. The oil stream to be atomized may first be degassed at compressor discharge pressure by heating within a pressure vessel and recovering the energy added by using the outgoing oil stream to heat the incoming oil stream. The stripped gas is typically returned to the compressor discharge flow. In the preferred case, the compressor rotors both contain a hollow cavity through which working liquid oil is injected into channels along the edges of the rotors, thereby forming a continuous and positive seal between the rotor edges and the compressor casing. In the alternative method, working liquid oil is injected either in the same direction as the rotor rotation or counter to rotor rotation through channels in the compressor casing which are tangential to the rotor edges and parallel to the rotor center lines or alternatively the channel paths coincide with the helical path of the rotor edges. 14 figs.

Fresco, A.N.

1997-08-05T23:59:59.000Z

400

Apparatus and methods for cooling and sealing rotary helical screw compressors  

DOE Patents [OSTI]

In a compression system which incorporates a rotary helical screw compressor, and for any type of gas or refrigerant, the working liquid oil is atomized through nozzles suspended in, and parallel to, the suction gas flow, or alternatively the nozzles are mounted on the suction piping. In either case, the aim is to create positively a homogeneous mixture of oil droplets to maximize the effectiveness of the working liquid oil in improving the isothermal and volumetric efficiencies. The oil stream to be atomized may first be degassed at compressor discharge pressure by heating within a pressure vessel and recovering the energy added by using the outgoing oil stream to heat the incoming oil stream. The stripped gas is typically returned to the compressor discharge flow. In the preferred case, the compressor rotors both contain a hollow cavity through which working liquid oil is injected into channels along the edges of the rotors, thereby forming a continuous and positive seal between the rotor edges and the compressor casing. In the alternative method, working liquid oil is injected either in the same direction as the rotor rotation or counter to rotor rotation through channels in the compressor casing which are tangential to the rotor edges and parallel to the rotor centerlines or alternatively the channel paths coincide with the helical path of the rotor edges.

Fresco, Anthony N. (P.O. Box 734, Upton, NY 11973)

1997-01-01T23:59:59.000Z

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

Cup Anemometer Behavior in Turbulent Environments  

Science Journals Connector (OSTI)

The behavior of the cup anemometer rotor in turbulent atmospheric flow is discussed in terms of a general equation of motion. This equates the rate of change s?? of the rotation rate s? of the rotor to a forcing F(s?, h?, w?), which is proportional ...

Leif Kristensen

1998-02-01T23:59:59.000Z

402

California Renewable Energy Center Integrated Assessment  

E-Print Network [OSTI]

Technologies ­ Bigger Rotors · Wind turbine rotors are getting larger · Example: ­ ca. 2002: GE 1.5 ­ 65m, 70.m ­ Advanced Towers, Turbine-Level Energy Storage · Advanced towers ­ Hybrid steel-concrete ­ Spaceframes;California Renewable Energy Center Organization of this session: · Overview of solar, wind, geothermal

California at Davis, University of

403

Isolation and Characterization of a Novel Cytolytic Factor in Purple Fluid of the Sea Hare, Aplysia kurodai  

Science Journals Connector (OSTI)

...susceptibility artifacts because of air bubbles trapped inside the rotor, or to melanin...We set our choice to 75 ms. The stability of the tissue sample inside the rotor...temperatures C would help improve the biological stability of the sample but at the expense of resolution...

Masatoshi Yamazaki; Katsuya Kimura; Jun Kisugi; Koji Muramoto; and Hisao Kamiya

1989-07-15T23:59:59.000Z

404

JOURNAL DE PHYSIQUE Colloque C5, suppl6ment au n010, Tome 49, octobre 1988  

E-Print Network [OSTI]

turbocharger and gas turbine rotors made of silicon nitride. These rotors must usually be attached to a metal of Engineering Materials, Luled University of Technology, S-951 87 Luled, Sweden ABSTRACT Recent advances is a part of an assessment to develop solid state bonding methods for the joining of silicon nitride

Boyer, Edmond

405

Simplified Hybrid-Secondary Uncluttered Machine And Method  

DOE Patents [OSTI]

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 secondary air gap (49) so as to induce a slip current in the secondary coils (47c, 47d). The rotor (46, 76) has magnetic brushes (A, B, C, D) or wires (80) which couple flux in through the rotor (46) to the secondary coils (47c, 47d) without inducing a current in the rotor (46) and without coupling a stator rotational energy component to the secondary coils (47c, 47d). The machine can be operated as a motor or a generator in multi-phase or single-phase embodiments. A method of providing a slip energy controller is also disclosed.

Hsu, John S [Oak Ridge, TN

2005-05-10T23:59:59.000Z

406

Method and apparatus for automated processing and aliquoting of whole blood samples for analysis in a centrifugal fast analyzer  

DOE Patents [OSTI]

A rotor and disc assembly for use in a centrifugal fast analyzer. The assembly is designed to process multiple samples of whole blood followed by aliquoting of the resultant serum into precisely measured samples for subsequent chemical analysis. The assembly requires minimal operator involvement with no mechanical pipetting. The system comprises: (1) a whole blood sample disc; (2) a serum sample disc; (3) a sample preparation rotor; and (4) an analytical rotor. The blood sample disc and serum sample disc are designed with a plurality of precision bore capillary tubes arranged in a spoked array. Samples of blood are loaded into the blood sample disc by capillary action and centrifugally discharged into cavities of the sample preparation rotor where separation of serum and solids is accomplished. The serum is loaded into the capillaries of the serum sample disc by capillary action and subsequently centrifugally expelled into cuvettes of the analyticaly rotor for conventional methods. 5 figs.

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

1985-08-05T23:59:59.000Z

407

Method for improved gas-solids separation  

DOE Patents [OSTI]

Methods are disclosed for the removal of particulate solids from a gas stream at high separation efficiency, including the removal of submicron size particles. The apparatus includes a cyclone separator type of device which contains an axially mounted perforated cylindrical hollow rotor. The rotor is rotated at high velocity in the same direction as the flow of an input particle-laden gas stream to thereby cause enhanced separation of particulate matter from the gas stream in the cylindrical annular space between the rotor and the sidewall of the cyclone vessel. Substantially particle-free gas passes through the perforated surface of the spinning rotor and into the hollow rotor, from where it is discharged out of the top of the apparatus. Separated particulates are removed from the bottom of the vessel. 4 figs.

Kusik, C.L.; He, B.X.

1990-11-13T23:59:59.000Z

408

Comparative study of voltage oriented and frequency coordinated control of grid connected doubly fed induction generator  

Science Journals Connector (OSTI)

In this paper a comparative study between voltage oriented control (VOC) and frequency coordinated control (FCC) of grid connected doubly fed induction generator (DFIG) is presented. The two method controls are deeply done on DFIG converter sides grid side converter (GSC) and rotor side converter (RSC). The VOC method permanently maintains the DFIG reactive power to zero values to achieve stable voltage. This control is implemented by regulating the rotor direct axis reference current in RSC using grid reactive power. On the other hand the FCC has employed the active power obtaining from the system frequency deviation to control the rotor quadrature axis reference current in the RSC. The GSC is the same in two studies and its applied vector controlled method. The comparison study between the two methods is conducted at a steady and dynamic state under constant and variable wind speeds. The simulation results are carried out by using PSCAD/EMTDC electromagnetic transient program to validate the comparison study between two methods control of DFIG. The outcomes of the simulation show that the VOC is very convenient when the DFIG operated at transient mode and variable wind speeds while the FCC is feasible and effective for steady-state mode applications. Furthermore the FCC method has an ability to reduce the active and reactive powers ripples as well as decreasing torque harmonics. Both of two methods had fewer transient recovery values of output parameters which ensure safety dynamic response of DFIG and power system. This study contributes significantly to choose the suitable control of the DFIG converters according to electrical grid operation conditions. In addition if a joint control has been applied to these two methods the wind power gained strong and flexible control of the frequency and voltage for different operating conditions.

Li Yang

2014-01-01T23:59:59.000Z

409

Breaking symmetry through speed-induced beam-deflection via centrifugation of the light source  

E-Print Network [OSTI]

The experiment proposed aims to evidence and to measure the deflection of light rays induced by the source speed upon emission, and to discern it from the aberration of light rays induced by the observer speed. The method stands in creating a speed asymmetry between that of the source and that of the observer, and relies on the centrifugation of a light source at ultrahigh speed. When source and observer have the same speed, such as when being both on the same inertial system, the deflection and the aberration compensate and their net effect is null. So, in order to circumscribe the odds of inertial systems and to isolate these speed-induced effects it has instead been appealed to a centrifugal system, since it allows infringing symmetry between the source and the observer speeds. Three cases are considered. (a) Centrifugation of the source fixed at one end of the rotor arm, while the detector is fixed on the rotor axis. This configuration of the experiment aims to unveil that due to the peripheral speed of the source the beam is deflected forward, so it impinges on the centric detector slightly shifted from its position when the system was not rotating. (b) The positions of the source and the detector are interchanged, so the source peripheral speed is then null and thus no speed-induced deflection ensues, but due to the observer peripheral speed there is a speed-induced aberration since during the beam time-of-flight the detector has slightly moved side-way. However, this time the spot shifts in opposite direction and hence the effect of centrifugation is not reciprocal. (c) The source and the detector are fixed at the two ends of the rotor arms. In this case the beam deflection and aberration add, since their speed vectors have opposite directions and each shift of the spot on the detector is double since the time-of-flight is double.

G. Sardin

2004-05-22T23:59:59.000Z

410

An overview of Boeing flywheel energy storage systems with high-temperature  

Science Journals Connector (OSTI)

An overview summary of recent Boeing work on high-temperature superconducting (HTS) bearings is presented. A design is presented for a small flywheel energy storage system that is deployable in a field installation. The flywheel is suspended by a HTS bearing whose stator is conduction cooled by connection to a cryocooler. At full speed, the flywheel has 5 kW h of kinetic energy, and it can deliver 3 kW of three-phase 208 V power to an electrical load. The entire system, which includes a containment structure, is compatible with transportation by forklift or crane. Laboratory measurements of the bearing loss are combined with the parasitic loads to estimate the efficiency of the system. Improvements in structural composites are expected to enable the operation of flywheels with very high rim velocities. Small versions of such flywheels will be capable of very high rotational rates and will likely require the low loss inherent in HTS bearings to achieve these speeds. We present results of experiments with small-diameter rotors that use HTS bearings for levitation and rotate in vacuum at kHz rates. Bearing losses are presented as a function of rotor speed.

M Strasik; J R Hull; J A Mittleider; J F Gonder; P E Johnson; K E McCrary; C R McIver

2010-01-01T23:59:59.000Z

411

Electric machine for hybrid motor vehicle  

DOE Patents [OSTI]

A power system for a motor vehicle having an internal combustion engine and an electric machine is disclosed. The electric machine has a stator, a permanent magnet rotor, an uncluttered rotor spaced from the permanent magnet rotor, and at least one secondary core assembly. The power system also has a gearing arrangement for coupling the internal combustion engine to wheels on the vehicle thereby providing a means for the electric machine to both power assist and brake in relation to the output of the internal combustion engine.

Hsu, John Sheungchun (Oak Ridge, TN)

2007-09-18T23:59:59.000Z

412

Development and Validation of an Aeroelastic Model of a Small Furling Wind Turbine: Preprint  

SciTech Connect (OSTI)

Small wind turbines often use some form of furling (yawing and/or tilting out of the wind) to protect against excessive power generation and rotor speeds in high winds.The verification study demonstrated the correct implementation of FAST's furling dynamics. During validation, the model tends to predict mean rotor speeds higher than measured in spite of the fact that the mean furl motion and rotor thrust are predicted quite accurately. This work has culminated with an enhanced version of FAST that should prove to be a valuable asset to designers of small wind turbines.

Jonkman, J. M.; Hansen, A. C.

2004-12-01T23:59:59.000Z

413

Wind turbine  

SciTech Connect (OSTI)

The improvement in a wind turbine comprises providing a tower with a freely liftable mount and adapting a nacelle which is fitted with a propeller windwheel consisting of a plurality of rotor blades and provided therein with means for conversion of wind energy to be shifted onto said mount attached to the tower. In case of a violent wind storm, the nacelle can be lowered down to the ground to protect the rotor blades from breakage due to the force of the wind. Required maintenance and inspection of the nacelle and replacement of rotor blades can be safely carried out on the ground.

Abe, M.

1982-01-19T23:59:59.000Z

414

Effect of Side Permanent Magnets for Reluctance Interior Permanent Magnet Reluctance Machines  

SciTech Connect (OSTI)

A traditional electric machine uses two dimensional magnetic flux paths in its rotor. This paper presents the development work on the utilization of the third dimension of a rotor. As an example, the air gap flux of a radial gap interior permanent magnet motor can be significantly enhanced by additional permanent magnets (PM) mounted at the sides of the rotor. A prototype motor built with this concept provided higher efficiency and required a shorter stator core length for the same power output as the Toyota/Prius traction drive motor.

Hsu, John S [ORNL; Lee, Seong T [ORNL; Wiles, Randy H [ORNL; Coomer, Chester [ORNL; Lowe, Kirk T [ORNL

2007-01-01T23:59:59.000Z

415

Inertia welding for assembly of copper squirrel cages for electric motors  

Science Journals Connector (OSTI)

Abstract The automotive industry is developing designs and manufacturing processes for new generations of electric motors intended for use in hybrid and electric vehicles. There is interest in replacing the aluminum traditionally used in induction motor rotors with copper to improve motor capability. This paper focuses on solid-state welding to join copper end rings to copper spokes in the fabrication of copper rotors. Inertia friction welding was explored to examine weldability of these copper components. A better understanding of inertia welding characteristics will help the advancements in its application for induction rotors. The limitations of this application are discussed.

John S. Agapiou

2014-01-01T23:59:59.000Z

416

Cooling system for rotating machine  

DOE Patents [OSTI]

An electrical machine comprising a rotor is presented. The electrical machine includes the rotor disposed on a rotatable shaft and defining a plurality of radial protrusions extending from the shaft up to a periphery of the rotor. The radial protrusions having cavities define a fluid path. A stationary shaft is disposed concentrically within the rotatable shaft wherein an annular space is formed between the stationary and rotatable shaft. A plurality of magnetic segments is disposed on the radial protrusions and the fluid path from within the stationary shaft into the annular space and extending through the cavities within the radial protrusions.

Gerstler, William Dwight (Niskayuna, NY); El-Refaie, Ayman Mohamed Fawzi (Niskayuna, NY); Lokhandwalla, Murtuza (Clifton Park, NY); Alexander, James Pellegrino (Ballston Lake, NY); Quirion, Owen Scott (Clifton Park, NY); Palafox, Pepe (Schenectady, NY); Shen, Xiaochun (Schenectady, NY); Salasoo, Lembit (Schenectady, NY)

2011-08-09T23:59:59.000Z

417

Aircraft engines. III  

SciTech Connect (OSTI)

Prospective powerplant configuration advancements for tilt-rotor subsonic flight, supersonic commercial flight, and hypersonic flight are speculated upon, with a view to possibilities for the exploitation of novel materials and of such advanced fuels as liquid methane and hydrogen. Attention is given to the foldable tilt-rotor concept, which employs a hydraulic torque converter to engage the fan stage of the high-bypass turbofan engine used in forward flight after the tilt-rotor blades have been stowed, and several advanced cycles and turbomechanical configurations for cruise in the high supersonic regime and beyond, through the hypersonic regime, and into orbital velocity.

Mikkelson, D.C.; Reck, G.M.

1988-01-01T23:59:59.000Z

418

Shaping the stator teeth of an isolated stator sections switched reluctance motor to deliver high output torque  

Science Journals Connector (OSTI)

In the isolated stator sections 6/8 SRMs, wide stator teeth produce high flux, yet not all of this flux generates output torque. For proper design of the 6/8 SRM, the rotor teeth widths are less than the stator teeth widths, which means that not all the flux in the stator transfers to the rotor. In this study, the stator teeth are tapered to optimise the stator flux transfer from the stator to the rotor in order to increase the output torque. A comparison between the torque of the SRM with and without tapered stator teeth is presented.

Eyhab El-Kharashi; Pia Salminen

2009-01-01T23:59:59.000Z

419

Diagnosis and Isolation of Air Gap Eccentricities in Closed-loop Controlled Doubly-Fed Induction Generators  

E-Print Network [OSTI]

N L g P ? ? ? ? ? ? ? ? ? (2.6) 17 ? ? 2 coso tab r rl N L g P ? ? ?? ?? ? ? ? ? (2.7) ?0 = permeability of air g = air gap length l = length of stator/rotor r = radius of stator/rotor Nt = number of turns of windings....9) The flux equations for the three stator and three rotor windings is given by abcs abcs abcs abcsr abcrL i L i? ? ? (2.10) abcr abcrs abcs abcr abcrL i L i? ? ? (2.11) The inductance matrices are obtained from (2.6) and (2.7) for Ns turns...

Meenakshi Sundaram, Vivek

2012-07-16T23:59:59.000Z

420

GSFC flywheel status  

SciTech Connect (OSTI)

The assessment of flywheel energy storage for spacecraft power system is based on the conceptual flywheel design. This conceptual design of an integrated flywheel is based on the Mechanical Capacitor which evolved from development of magnetic bearings and permanent magnet ironless-brushless DC motors. The mechanical capacitor is based on three key technologies: (1) a composite rotor with a low ID to OD ratio for high energy density (weight and volume) (2) magnetic suspension close to the geometric center of the rotating mass to minimize loads normally encountered on the ends of a shaft, a no-wear mechanism in a vacuum environment, and to minimize losses at high rotational speeds (3) permanent magnet ironless-brushless DC motor/generator for high efficiency of conversion and low losses at high rotational speeds. The complete system would include the necessary electronics for the motor/generator, containment, and counterrotating wheels for attitude control compatibility.

Rodriguez, G.E.

1983-12-01T23:59:59.000Z

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.


421

Characterization of noise from an isolated intermediate-sized wind turbine  

Science Journals Connector (OSTI)

Community-based wind power companies provide subscriptions to individual homeowners and businesses for power generated by a locally installed turbine. Typically such turbines are of an intermediate size such as the Vestas V20 120-kW turbines operated by the Cascade Community Wind Company in several locations within Washington state. This model turbine has a tower height of 80 feet with a rotor diameter of 60 ft. Each turbine is installed individually on leased land with no other turbines nearby. Noise measurements of a turbine located in Thorp WA were obtained in a variety of weather conditions. On several occasions with low to moderate wind speeds the turbine was stopped enabling the calculation of noise due to the turbine only. Results will be presented showing spectral content and sound pressure level contours for a range of wind speeds.

2014-01-01T23:59:59.000Z

422

Supersonic compressor  

DOE Patents [OSTI]

A gas compressor based on the use of a driven rotor having an axially oriented compression ramp traveling at a local supersonic inlet velocity (based on the combination of inlet gas velocity and tangential speed of the ramp) which forms a supersonic shockwave axially, between adjacent strakes. 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 gas compression ramp on a strake, the shock capture lip on the adjacent strake, and captures the resultant pressure within the stationary external housing while providing a diffuser downstream of the compression ramp.

Lawlor, Shawn P. (Bellevue, WA); Novaresi, Mark A. (San Diego, CA); Cornelius, Charles C. (Kirkland, WA)

2008-02-26T23:59:59.000Z

423

Page not found | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

21 - 6930 of 31,917 results. 21 - 6930 of 31,917 results. Article Turning Waste Heat into Power: Ener-G-Rotors and the Entrepreneurial Mentorship Program 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 escaped steam and turn it into energy. http://energy.gov/articles/turning-waste-heat-power-ener-g-rotors-and-entrepreneurial-mentorship-program Article Secretary Chu Announces Second Round of "America's Next Top Energy Innovator" on One Year Anniversary of the White House Startup

424

ACEEE Int. J. on Electrical and Power Engineering, Vol. 03, No. 01, Feb2012 DOI:01.IJEPE.03.01.39  

E-Print Network [OSTI]

requirement of loads operating at 50Hz and 400Hz simultaneously. A permanent magnet synchronous alternator [2, Dual Frequency Alternator, EMI Filter, Dual Rotor Shaft, Excitation Rectifier, Weapon system

Paris-Sud XI, Université de

425

Induction machine stray loss from inter-bar currents  

E-Print Network [OSTI]

Stray load loss refers generally to the sources of induction machine loss not accounted for by typical calculations of primary or secondary copper loss, no load core loss, or friction and windage loss. Harmonic rotor bar ...

Englebretson, Steven Carl

2009-01-01T23:59:59.000Z

426

Sandia National Laboratories: Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

On April 27, 2011, in Active Aero Blade Load Control Design Report(2771KB PDF) "SMART Wind Turbine Rotor: Data Analysis and Conclusions" J.C. Berg, M. F. Barone, N. C. Yoder...

427

Influence of Motion Cueing on Helicopter Stabilization  

E-Print Network [OSTI]

in real-time by using a three-body mass-spring rotor system and numerical approximations accelerations), and yaw rotation (controlling heading direction). The height above ground was automatically

428

In-Flight Performance Optimization for Rotorcraft with Redundant Controls Gurbuz Taha Ozdemir  

E-Print Network [OSTI]

control system is designed to perform in-flight optimization of redundant control effectors on a compound controller is implemented for inner loop control of roll, pitch, yaw, heave, and rotor RPM. An outer loop

Maroncelli, Mark

429

Design and control of a passively stabilized multimodal hopping robot  

E-Print Network [OSTI]

the spin rotor assembly, the batteries selected changed fromfactor 9 volt Lithium Polymer batteries to a matched pair ofof six 1.2 V subC NiMH batteries. These were placed along

Pantel, Erica

2010-01-01T23:59:59.000Z

430

Improving the aerodynamic efficiency of blade profile cascade used in a cooled turbine  

Science Journals Connector (OSTI)

Good effect from using rotor blade cascades, the pressure side’s profile of which has a bend near the trailing edge at an angle of no larger than 15°, is confirmed from the results of experimental studies.

B. I. Mamaev; M. R. Valeev

2010-09-01T23:59:59.000Z

431

Sandia National Laboratories: Advanced Controls of Wave Energy...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

New Facility Tool at SWiFT Makes Rotor Work More Efficient Advanced Controls of Wave Energy Converters May Increase Power Capture Up to 330% On January 21, 2014, in...

432

Joules of Wisdom: Top Things You Didn't Know About Energy | Department...  

Energy Savers [EERE]

photo. Top 9 Things You Didn't Know About America's Power Grid Bigger and Stronger: Wind turbines are soaring to record sizes. The average rotor diameter of turbines installed in...

433

Top 10 Things You Didn't Know About Wind Power | Department of...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Didn't Know About Wind Power August 18, 2014 - 7:40am Addthis Bigger and Stronger: Wind turbines are soaring to record sizes. The average rotor diameter of turbines installed in...

434

2013 Wind Week | Department of Energy  

Energy Savers [EERE]

per kilowatt hour. | Photo courtesy of Juhl Energy. 4 of 9 Bigger and Stronger: Wind turbines are soaring to record sizes. The average rotor diameter of turbines installed in...

435

DOE Seeking Proposals to Advance Distributed Wind Turbine Technology...  

Energy Savers [EERE]

Project (CIP). The CIP aims to help U.S. manufacturers of small and mid-sized wind turbines with rotor swept areas up to 1,000 square meters improve their turbine designs and...

436

WKA Service Fehmarn | Open Energy Information  

Open Energy Info (EERE)

Wind energy Product: A German-based firm specialised in the service and repair of wind turbines and rotor blades. References: WKA Service Fehmarn1 This article is a stub. You...

437

2013 Wind Report | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

per kilowatt hour. | Photo courtesy of Juhl Energy. 4 of 9 Bigger and Stronger: Wind turbines are soaring to record sizes. The average rotor diameter of turbines installed in...

438

Operational behavior of a double-fed permanent magnet generator for wind turbines  

E-Print Network [OSTI]

Greater efficiency in wind turbine systems is achieved by allowing the rotor to change its rate of rotation as the wind speed changes. The wind turbine system is decoupled from the utility grid and a variable speed operation ...

Reddy, Sivananda Kumjula

2005-01-01T23:59:59.000Z

439

Sandia National Laboratories: Structural and Mechanical Adaptive...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

The photo inset is a closer look at the flaps on one blade. Actively controlling the aerodynamic loads on a wind-turbine rotor could benefit the entire turbine system...

440

WP2 IEA Wind Task 26:The Past and Future Cost of Wind Energy  

E-Print Network [OSTI]

Innovation Pathway LM Glasfiber Blades WindPACT BaselineBlade Data Mass (kg) LM Glasfiber Blades Rotor Radius (m)Innovation Pathway LM Glasfiber Blades TPI Innovative Blade

Lantz, Eric

2014-01-01T23:59:59.000Z

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.


441

WP2 IEA Wind Task 26:The Past and Future Cost of Wind Energy  

E-Print Network [OSTI]

Innovation Pathway LM Glasfiber Blades WindPACT BaselineBlade Data Mass (kg) LM Glasfiber Blades Rotor Radius (m)Blade Innovation Pathway LM Glasfiber Blades TPI Innovative

Lantz, Eric

2014-01-01T23:59:59.000Z

442

(c)2001 AmericanInstituteof Aeronautics & Astronauticsor Published with Permission of Author(s) and/orAuthor(s)1 Sponsoring Organization.  

E-Print Network [OSTI]

, unsteady wake flows, and time dependent geometries such as helicopter rotor blades, propellers, or compressor and turbine blades. For the calculation of time dependent flows, im- plicit methods offer

Jameson, Antony

443

The Effects of Coulomb Friction on the Performance of Centrifugal Pendulum Vibration  

E-Print Network [OSTI]

rotors, turbines, and rotary aircraft engines. CPVAs have been used for several decades, having been proposed by E. S. Taylor in 1934 [6] to prevent propeller shaft failures in the Wright R-1820 engine

Feeny, Brian

444

Theor. Comput. Fluid Dyn. DOI 10.1007/s00162-011-0241-y  

E-Print Network [OSTI]

such as propellers, wind turbines and helicopter rotors are known to develop a system of helical vortices through the turbine (resp. the propeller) and becomes constant within a downstream distance comparable

Delbende, Ivan

445

1 Copyright 2003 by ASME Proceedings of FEDSM'03  

E-Print Network [OSTI]

in turbines and the blade-tip is known to be susceptible to damage from excessive thermal loading [2 configuration [1-10]. For liquid handling systems like axial pumps and ducted propellers (Fig. 1), the rotor tip

Mittal, Rajat

446

A method for measuring the coordinates of an asynchronous motor in a frequency-controlled electric drive of mine excavator mechanisms  

Science Journals Connector (OSTI)

This paper deals with methods for calculating the electromagnetic torque of an asynchronous motor with a square-cage rotor of the electric drive of the bucket-lifting mechanism of ... description of electromagnet...

P. A. Osipov; A. L. Karyakin

2012-09-01T23:59:59.000Z

447

A Motor-Driven, Mechanically Supported Ultracentrifuge for the Separation of Biological Materials  

Science Journals Connector (OSTI)

...Pennsylvania. | Journal Article A MOTOR-DRIVEN, MECHANICALLY SUPPORTED...present communication describes a motor-driven, mechan- ically supported...the rotor by a unit driven by an electric motor. The driving mechanism is a "lathe...

Arthur J. Rawson; Henry W. Scherp; F. E. Lindquist

1940-11-01T23:59:59.000Z

448

Control Of Electric Motor Parameters On The Basis Of Qr- Decomposition Technique  

Science Journals Connector (OSTI)

Control of DC motor on the basis of QR-decomposition technique is given in this paper. Authors propose to control DC motor parameter using step-by-step method of rotor’ s parameters definition. The first step ...

First A. Viktor Melnikov…

2008-01-01T23:59:59.000Z

449

Low-cost motor drive embedded fault diagnosis systems  

E-Print Network [OSTI]

Electric motors are used widely in industrial manufacturing plants. Bearing faults, insulation faults, and rotor faults are the major causes of electric motor failures. Based on the line current analysis, this dissertation mainly deals with the low...

Akin, Bilal

2009-05-15T23:59:59.000Z

450

NETL F 451.1-1/1 Categorical Exclusion (CX) Designation Form  

Broader source: Energy.gov (indexed) [DOE]

SCNGO 2010 Gary Covatch 12 months Cambridge, MA Low-Cost Wet Gas Compressor for Stripper Gas Wells Design and adapt the hybrid rotor compressor technology to stripper well...

451

Measurements versus Predictions for a Hybrid (Hydrostatic plus Hydrodynamic Thrust Bearing for a Range of Orifice Diameters  

E-Print Network [OSTI]

A fixed geometry hybrid thrust bearing is investigated with three different supply orifice diameters. The test rig uses a face-to-face thrust bearing design, with the test bearing acting as the rotor loading mechanism. A hydraulic shaker applies...

Esser, Paul R.

2011-08-08T23:59:59.000Z

452

Helical screw viscometer  

DOE Patents [OSTI]

A helical screw viscometer for the measurement of the viscosity of Newtonian and non-Newtonian fluids comprising an elongated cylindrical container closed by end caps defining a circular cylindrical cavity within the container, a cylindrical rotor member having a helical screw or ribbon flight carried by the outer periphery thereof rotatably carried within the cavity whereby the fluid to be measured is confined in the cavity filling the space between the rotor and the container wall. The rotor member is supported by axle members journaled in the end caps, one axle extending through one end cap and connectable to a drive source. A pair of longitudinally spaced ports are provided through the wall of the container in communication with the cavity and a differential pressure meter is connected between the ports for measuring the pressure drop caused by the rotation of the helical screw rotor acting on the confined fluid for computing viscosity.

Aubert, J.H.; Chapman, R.N.; Kraynik, A.M.

1983-06-30T23:59:59.000Z

453

Pressure balanced drag turbine mass flow meter  

DOE Patents [OSTI]

The density of the fluid flowing through a tubular member may be measured by a device comprising a rotor assembly suspended within the tubular member, a fluid bearing medium for the rotor assembly shaft, independent fluid flow lines to each bearing chamber, and a scheme for detection of any difference between the upstream and downstream bearing fluid pressures. The rotor assembly reacts to fluid flow both by rotation and axial displacement; therefore concurrent measurements may be made of the velocity of blade rotation and also bearing pressure changes, where the pressure changes may be equated to the fluid momentum flux imparted to the rotor blades. From these parameters the flow velocity and density of the fluid may be deduced.

Dacus, M.W.; Cole, J.H.

1980-04-23T23:59:59.000Z

454

Pressure balanced drag turbine mass flow meter  

DOE Patents [OSTI]

The density of the fluid flowing through a tubular member may be measured by a device comprising a rotor assembly suspended within the tubular member, a fluid bearing medium for the rotor assembly shaft, independent fluid flow lines to each bearing chamber, and a scheme for detection of any difference between the upstream and downstream bearing fluid pressures. The rotor assembly reacts to fluid flow both by rotation and axial displacement; therefore concurrent measurements may be made of the velocity of blade rotation and also bearing pressure changes, where the pressure changes may be equated to the fluid momentum flux imparted to the rotor blades. From these parameters the flow velocity and density of the fluid may be deduced.

Dacus, Michael W. (Gilbert, AR); Cole, Jack H. (Fayetteville, AR)

1982-01-01T23:59:59.000Z

455

Permanent Magnet Generators (PMG) for Wind Turbines and Micro Hydro Turbines  

Science Journals Connector (OSTI)

There are essential differences in the design of systems for water/air flow kinetic energy conversion into mechanical energy. First of all, speeds of rotation of the turbine rotors are different: the speed of tho...

Ion Bostan; Adrian Gheorghe; Valeriu Dulgheru; Ion Sobor…

2013-01-01T23:59:59.000Z

456

Modeling of chemical mechanical polishing for shallow trench isolation  

E-Print Network [OSTI]

This thesis presents the nonlinear analysis, design, fabrication, and testing of an axial-gap magnetic induction micro machine, which is a two-phase planar motor in which the rotor is suspended above the stator via mechanical ...

Lee, Brian, 1975-

2002-01-01T23:59:59.000Z

457

Influence of idling and short circuits on the self-excitation of a classical double-output induction generator  

Science Journals Connector (OSTI)

Experimental results for the capacitor self-excitation of an induction generator with a short-circuited phase rotor and a classical double-output induction generator are compared. The influence of the preceding ....

A. -Z. R. Dzhendubaev; R. Yu. Barakhoev

2013-07-01T23:59:59.000Z

458

Quasiclassical Approximation for Slow Neutron Scattering  

Science Journals Connector (OSTI)

......Approximation for Slow Neutron Scattering Takeo Nishigori Department...formula for the differential scattering cross section of a slow neutron is derived along the line...of Spherical Rotors and Neutron Scattering Juichiro Hama and Tuto......

Takeo Nishigori

1970-06-01T23:59:59.000Z

459

Microsoft PowerPoint - Keystone Update June 2014  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cracks Keystone Rotor Cracks B i P B ll E I Brian P. Bell, E.I. Mechanical Engineer Hydroelectric Design Center 17 June 2014 US Army Corps of Engineers BUILDING STRONG Outline...

460

SciTech Connect: Field Test Results from Lidar Measured Yaw Control...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

This bias could be caused by a number of issues such as: poor calibration, electromagnetic interference, rotor wake, or other effects. With a lidar mounted on the nacelle, a...

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

Optimizing the start-up operations of combined cycle power plants using soft computing methods  

Science Journals Connector (OSTI)

......keeping the life-time consumption of the more critically...1200 s) the rotor engine velocity of the gas...1170029416] Y2 Fuel consumption (Kg) [53000230330...minimize time minimize fuel consumption maximize energy production......

Ilaria Bertini; Matteo De Felice; Alessandro Pannicelli; Stefano Pizzuti

2012-08-01T23:59:59.000Z

462

E-Print Network 3.0 - axoplasmic pressure waves Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

obtained in the wave rotor. This is in contrast to the untopped engine, where the turbine inlet pressure... of the topped engine is higher than that of the ... Source: Akbari,...

463

Characterization of turbine rim seal flow and its sealing effectiveness  

E-Print Network [OSTI]

In a gas turbine engine, ingestion of hot gas from the flowpath into the gaps between the turbine rotor and stator can lead to elevated metal temperatures and a deterioration of component life. To prevent ingestion, bleed ...

Catalfamo, Peter T

2013-01-01T23:59:59.000Z

464

Dynamic Characterization of a Free-Free Wind Turbine Blade Assembly  

Science Journals Connector (OSTI)

Accurate prediction of full-field dynamic stress–strain of rotating structures is needed (e.g. wind turbines or helicopter rotors) during operation for condition based monitoring and damage prognosis. In order...

Javad Baqersad; Christopher Niezrecki…

2013-01-01T23:59:59.000Z

465

Effect of stress ratio on fatigue life of GFRP composites for WT blade  

Science Journals Connector (OSTI)

Fatigue life of GFRP (glass-fiber reinforced plastic) composites used in wind turbine rotor blades has been evaluated considering the glass fiber orientations. Three different laminate composites with the resp...

Yong-Hak Huh; Jae-Hyun Lee; Dong-Jin Kim…

2012-07-01T23:59:59.000Z

466

Calculation of performance characteristics and partial load behaviour  

Science Journals Connector (OSTI)

Calculating the forces and the relative velocities at the rotor blades for tip speed ratios other than the design tip speed ratio requires a substantial effort. In the following a method is described which is ...

Prof. Dr.-Ing. Robert Gasch; Prof. Dr.-Ing. Jochen Twele

2012-01-01T23:59:59.000Z

467

Harmonics and inter harmonics estimation of DFIG based standalone wind power system by parametric techniques  

Science Journals Connector (OSTI)

Abstract This paper presents application of parametric techniques (Estimation of signal parameter by rotational invariance techniques (ESPRIT), Root multiple signal classification (Root MUSIC)) for the estimation of harmonics/inter harmonics produced by wind generator under constant, variable rotor speed, load imbalance. Accuracy of estimation by parametric techniques is checked on synthetic signal as well as signal extracted from DFIG based standalone system with constant rotor speed and balanced load condition. Further sliding window concept is applied to parametric techniques to estimate the harmonics/inter harmonics under variable rotor speed and load unbalance. Series of simulation results demonstrate the advantages of the sliding window ESPRIT over sliding window Root MUSIC in the estimation of harmonics and inter harmonics under variable rotor speed as well as load unbalance condition.

Sanjay Agrawal; Soumya R. Mohanty; Vineeta Agarwal

2015-01-01T23:59:59.000Z

468

DFIG sliding mode control fed by back-to-back PWM converter with DC-link voltage control for variable speed wind turbine  

Science Journals Connector (OSTI)

This paper proposes an indirect power control of doubly fed induction generator (DFIG) with the rotor connected to the electric ... generation. Appropriate state space model of the DFIG is deduced. An original co...

Youcef Bekakra; Djilani Ben Attous

2014-09-01T23:59:59.000Z

469

On Impedance Spectroscopy Contribution to Failure Diagnosis in Wind Turbine Generators  

E-Print Network [OSTI]

-fed induction generator, failure diagnosis, impedance spectroscopy. Nomenclature WT = Wind Turbine; DFIG rotor end- rings and harmonic degrading. In particular, DFIG-based WT failure diagnosis seems to become

Boyer, Edmond

470

Analytical and experimental investigations of hybrid air foil bearings  

E-Print Network [OSTI]

Air foil bearings offer several advantages over oil-lubricated bearings in high speed micro-turbomachinery. With no contact between the rotor and bearings, the air foil bearings have higher service life and consequently lesser standstills between...

Kumar, Manish

2009-05-15T23:59:59.000Z

471

A doubly-fed machine for propulsion applications  

E-Print Network [OSTI]

A doubly fed machine for propulsion applications is proposed, which, given the presence of AC and DC power sources, can be utilized in order to improve efficiency, weight, volume, and sizing of the rotor power electronics. ...

Tomovich, Michael S. (Michael Stephen)

2014-01-01T23:59:59.000Z

472

Design and analysis of a composite flywheel preload loss test rig  

E-Print Network [OSTI]

process. Successful detection of the change in mass eccentricity was verified analytically through dynamic modeling of the flywheel rotor and magnetic suspension system. During steady state operation detection was determined to be feasible via...

Preuss, Jason Lee

2004-09-30T23:59:59.000Z

473

A PERSPECTIVE ON THE NUMERICAL AND EXPERIMENTAL CHARACTERISTICS OF MULTI-MODE DRY-FRICTION WHIP AND WHIRL  

E-Print Network [OSTI]

of tapered Timoshenko beam finite elements to form multiple degree of freedom rotor and stator models. These models are reduced by component mode synthesis to discard highfrequency modes while retaining physical coordinates at locations for nonlinear...

Wilkes, Jason C.

2010-01-16T23:59:59.000Z

474

Analysis of the Concentric Planetary Magnetic Gear  

E-Print Network [OSTI]

been fabricated and will be used to verify the analysis undertaken. The prototype is used to verify variations of the stator pole pieces as well as the inner rotor magnetic layout. A dynamometer has been assembled to test the performance...

Frank, Nicolas Walter

2012-07-16T23:59:59.000Z

475

Design and testing of a sensorless switched reluctance motor drive with a custom integrated circuit controller  

E-Print Network [OSTI]

presents a breadboard level SRM drive that emirates a custom IC controller implementing closedloop speed control and starting torque.The rotor position sensing information is essential for determining the switching instants to have proper control of speed...

Zhang, Yingxia

2012-06-07T23:59:59.000Z

476

Shrink fit effects on rotordynamic stability: experimental and theoretical study  

E-Print Network [OSTI]

This dissertation presents an experimental and theoretical study of subsynchronous rotordynamic instability in rotors caused by interference and shrink fit interfaces. The experimental studies show the presence of strong unstable subsynchronous...

Jafri, Syed Muhammad Mohsin

2007-09-17T23:59:59.000Z

477

Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings  

E-Print Network [OSTI]

-free micro turbomachinery. The pad radial compliance was for accommodation of large rotor growth at high speeds. Parametric studies on pivot offset, preload, and tilting stiffness were performed using non-linear orbit simulations and coast-down simulations...

Sim, Kyu-Ho

2009-05-15T23:59:59.000Z

478

Diagnostics of subsynchronous vibrations in rotating machinery - methodologies to identify potential instability  

E-Print Network [OSTI]

Rotordynamic instability can be disastrous for the operation of high speed turbomachinery in the industry. Most ??instabilities?? are due to de-stabilizing cross coupled forces from variable fluid dynamic pressure around a rotor component, acting...

Kar, Rahul

2005-11-01T23:59:59.000Z

479

Analysis of side end pressurized bump type gas foil bearings: a model anchored to test data  

E-Print Network [OSTI]

profound effect on the rotordynamic performance of GFBs. This dissertation presents the first study that devotes considerable attention to the effect of side end pressurization on delaying the onset rotor speed of subsynchronous motions. GFB performance...

Kim, Tae Ho

2008-10-10T23:59:59.000Z

480

Analysis of side end pressurized bump type gas foil bearings: a model anchored to test data  

E-Print Network [OSTI]

profound effect on the rotordynamic performance of GFBs. This dissertation presents the first study that devotes considerable attention to the effect of side end pressurization on delaying the onset rotor speed of subsynchronous motions. GFB performance...

Kim, Tae Ho

2009-05-15T23:59:59.000Z

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

Electrical instrumentation of a contra-rotating propeller drive system  

E-Print Network [OSTI]

A prototype ship propulsion device based on an electric motor that spins propellers in opposite directions was constructed and tested. The device uses a single motor to spin both propellers without a gearbox. The rotor is ...

Angle, Matthew G. (Matthew Gates)

2011-01-01T23:59:59.000Z

482

Calculation and Analysis of Temperature and Fluid Fields in Water-Cooled Motor for Coal Cutters  

Science Journals Connector (OSTI)

To study the temperature distribution of the water-cooled motor for coal cutters, with the aid of ... the temperature distributions of stators, rotors and water-cooled jackets are worked out. Considering the fact...

Dawei Meng; Liying Wang; Yongming Xu

2012-01-01T23:59:59.000Z

483

Study of the Dipolar Proton Spin System in Lithium Acetate with NMR Dispersion Spectroscopy  

Science Journals Connector (OSTI)

Lithium acetate contains almost freely rotating methyl groups [1...3-rotors lie in coaxial pairs, with their planes of rotation separated by 2.5 Å along the rotation axis, a not so large distance compared to the ...

E. Crits; L. Van Gerven

1987-01-01T23:59:59.000Z

484

Tracking Talking: Dual Task Costs of Planning and Producing Speech for Young versus Older Adults  

E-Print Network [OSTI]

A digital pursuit rotor was used to monitor speech planning and production costs by time-locking tracking performance to the auditory wave form produced as young and older adults were describing someone they admire. The ...

Kemper, Susan; Hoffman, Lesa; Schmalzried, RaLynn Cheri; Herman, Ruth; Kieweg, Doug

2011-05-01T23:59:59.000Z

485

Submerged electricity generation plane with marine current-driven motors  

DOE Patents [OSTI]

An underwater apparatus for generating electric power from ocean currents and deep water tides. A submersible platform including two or more power pods, each having a rotor with fixed-pitch blades, with drivetrains housed in pressure vessels that are connected by a transverse structure providing buoyancy, which can be a wing depressor, hydrofoil, truss, or faired tube. The platform is connected to anchors on the seafloor by forward mooring lines and a vertical mooring line that restricts the depth of the device in the water column. The platform operates using passive, rather than active, depth control. The wing depressor, along with rotor drag loads, ensures the platform seeks the desired operational current velocity. The rotors are directly coupled to a hydraulic pump that drives at least one constant-speed hydraulic-motor generator set and enables hydraulic braking. A fluidic bearing decouples non-torque rotor loads to the main shaft driving the hydraulic pumps.

Dehlsen, James G.P.; Dehlsen, James B.; Fleming, Alexander

2014-07-01T23:59:59.000Z

486

Development of multiscale models for the performance of the gas and oil seals in rotary engines  

E-Print Network [OSTI]

Rotary engines offer higher power density, fewer parts and lower vibrations than conventional reciprocating piston engines. However, rotary engines are more difficult to seal because of the rotor shape which leads to higher ...

Picard, Mathieu

2014-01-01T23:59:59.000Z

487

Research Items  

Science Journals Connector (OSTI)

... the motors were of the 3-phase double-wound squirrel-cage-rotor type controlled by contactor-type star-delta starters. During the starting period, the current was found to be ...

1944-07-29T23:59:59.000Z

488

High-Temperature-High-Volume Lifting for Enhanced Geothermal...  

Broader source: Energy.gov (indexed) [DOE]

Motor 300C Water Test Section Cross-section View Stator Motor Housing Rotor Bearings Seal Winding 9 | US DOE Geothermal Program eere.energy.gov Geothermal ESP - Thermal Test...

489

Dynamic analysis of a 5 megawatt offshore floating wind turbine  

E-Print Network [OSTI]

wind turbine. Rating Control Rotor Radius Rated Wind Speed Towerwind turbine is used in this design, however there are slight modifications of the tower.of the tower. Figure 2.3: NREL 5 MW Reference Wind Turbine [

Harriger, Evan Michael

2011-01-01T23:59:59.000Z

490

Value Capture in the Global Wind Energy Industry  

E-Print Network [OSTI]

a large scale wind turbine are the tower, blades, and gearcost of large wind turbine (REpower MM92) Tower Rotor bladesa utility-scale wind turbine. Towers run from 40-100 meters,

Dedrick, Jason; Kraemer, Kenneth L.

2011-01-01T23:59:59.000Z

491

Nuclear Nonproliferation,  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

for Wireless Sensing, Sensory Substitution, Multi-rotor Damage Detection, Drill Vibration Reduction, Laser Ultrasonics for Non Destructive Evaluation T y p i c a l P r o j e...

492

Analysis of Automotive Turbocharger Nonlinear Response Including Bifurcations  

E-Print Network [OSTI]

automotive TCs operate with variable rotational speed, predictions are conducted with shaft acceleration/deceleration. Over most of its operating speed range, TC rotor nonlinear response predictions display two subsynchronous whirl frequencies w1 and w 2...

Vistamehr, Arian

2010-10-12T23:59:59.000Z

493

A NUMERICAL AND EXPERIMENTAL STUDY OF WINDBACK SEALS  

E-Print Network [OSTI]

performance and the flow field inside the seal. The leakage flow rate increases with increasing the pressure differential, rotor speed, radial clearance, cavity size, and shaft diameter and with decreasing the tooth width. The eccentricity has a minimal effect...

Lim, Chae H.

2010-01-16T23:59:59.000Z

494

Effects of upstream wake phasing on the performance of transonic compressors  

E-Print Network [OSTI]

The effect of the upstream wake phase on the work input (i.e., rise in stagnation enthalpy across the blade row) of a transonic rotor is examined computationally and analytically. It is found that the compressor work depends ...

Nolan, Sean Patrick Rock

2009-01-01T23:59:59.000Z

495

New Rotary Engine Designs by Deviation Function Method  

E-Print Network [OSTI]

spring underneath, F S , necessary for starting the engine,the engine, the rotor apexes are replaced by spring-loadedengine designs require minimization of the size and weight of the apex seals in order to minimize the spring

Warren, Sarah

2012-01-01T23:59:59.000Z

496

International Micro Electro Mechanical Systems Conference, MEMS 2001, Interlaken, Switzerland, January 2001 1 AN ELECTROSTATIC INDUCTION MICROMOTOR  

E-Print Network [OSTI]

for such micromachines include dime- sized gas-turbine generators powering mobile electronic devices, motor-driven pumps-lubricated bearings - A pair of hydrostatic thrust bearings floats the rotor in the axial direction, while

Frechette, Luc G.

497

A spinning thermometer to monitor microwave heating and glass transitions in dynamic  

E-Print Network [OSTI]

A spinning thermometer to monitor microwave heating and glass transitions in dynamic nuclear in a static rotor by inserting a platinum thermometer. The accuracy is better than Ã? 0.9 K, even

498

Development of High-Capacity Desalination Plant Driven by Offshore Wind Turbine  

Science Journals Connector (OSTI)

This paper presents a development of the desalination plant based on the concept of the Wind Energy Marine Unit (WEMU) which is the high-capacity offshore wind turbine with the floating rotor. The great potential...

Valery V. Cheboxarov; Victor V. Cheboxarov

2009-01-01T23:59:59.000Z

499

Sensorless performance evaluation of induction motors  

E-Print Network [OSTI]

component flowing in the stator windings. 3. A slip frequency component produced by the interaction of the rotating field produced by the dc current component flowing in the rotor circuit, which rotates with the rotor speed, and the synchronously rotating... magnetic field of the stator. The mentioned torque components do not, however, take into account the effect of slotting on torque pulsation. The theoretical basis behind such an analysis has been 12 presented in a myriad of literature [25], thus...

Ahmed, Shehab

2012-06-07T23:59:59.000Z

500

Rotordynamic coefficients and leakage flow of parallel-grooved liquid-seals  

E-Print Network [OSTI]

to account for the circumferential flow in the grooves. Childs' (1987) method for determining Hirs' empirical coefficients from static test data. for seals with smooth rotors and homogeneously roughened stators has been modified to be consistent... flow by roughening the stator surface. In addition, the rotor forces determined from seal analysis are effected by the circumferential grooves in the stator. From a rotordynamics viewpoint, seal analysis has the objective of predicting...

Kilgore, James Joseph

2012-06-07T23:59:59.000Z