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TECHNICAL PAPERS

Wind Shear and Turbulence Effects on Rotor Fatigue and Loads Control

[+] Author and Article Information
A. J. Eggers, R. Digumarthi, K. Chaney

RANN Incorporated, 744 San Antonio Road, Suite 26, Palo Alto, California 94303e-mail: ranninc@pacbell.net

J. Sol. Energy Eng 125(4), 402-409 (Nov 26, 2003) (8 pages) doi:10.1115/1.1629752 History: Received February 27, 2003; Revised July 15, 2003; Online November 26, 2003
Copyright © 2003 by ASME
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References

Moriarty, P.J., Eggers, A.J., Jr., Chaney, K., and Holley, W.E., 2001 “Scale and Lag Effects on Control of Aerodynamic Power and Loads on a HAWT Rotor,” A Collection of the 2001 ASME Wind Energy Symposium Technical Papers Presented at the 39th AIAA Aerospace Sciences Meeting and Exhibit.
Eggers, A.J., Jr., Moriarty, P., Chaney, K., Digumarthi, R., and Holley, W.E., 2002 “Influence of Transition Modes and Gravity Loads on Rotor Fatigue and Power Control,” A Collection of the 2002 ASME Wind Energy Symposium Technical Papers Presented at the 40th AIAA Aerospace Sciences Meeting and Exhibit.
Iowa/Nebraska Distributed Wind Generation Projects First and Second-Year Operating Experience: 1999–2001. U.S. Department of Energy–EPRI Wind Turbine Verification Program. 1004039. Final Report, December 2001.
Wisconsin Low Wind Speed Turbine Project Third-Year Operating Experience: 2002–2001. U.S. Department of Energy–EPRI Wind Turbine Verification Program. 1004041. Final Report, December 2001.
Big Spring Wind Power Project Second-Year Operating Experience: 2002–2001. U.S. Department of Energy–EPRI Wind Turbine Verification Program. 1004042. Final Report, December 2001.
Kelley, Neil, Shirazi, Mari, Hand, Maureen, and Jager, David, 2002 “Low-Level Jet Turbulence Field Test,” NREL/NWTC, 2002 DOE Wind Program Review Meeting, May 7–9.
MATLAB Version 5.3 and SIMULINK, 1999, The Mathworks, Inc.
Hansen, A.C., 1997 “Users Guide to the Wind Turbine Dynamics Computer Programs YawDyn and AeroDyn for ADAMS, Version 10.0,” Mech. Eng. Dept., Univ. of Utah, June 23.

Figures

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Normalized fluctuations of wind speed
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Schematic of blade open-loop power control system
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Schematic of blade open-loop power control and closed-loop moment control system
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RMS Flatwise Root Moments, Shear Exponent=0.75, 2 Blades
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Flatwise Fatigue Damage, Shear Exponent=0.75, 2 and 3 Blades
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Flatwise Fatigue Damage, 12 m/s, Open Loop, 2 and 3 Blades
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Flatwise Fatigue Damage, 12 m/s, Closed Loop, 2 and 3 Blades
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In-plane Fatigue Damage, Shear Exponent=0.75, 2 Blades
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In-plane Fatigue Damage, Shear Exponent=0.75, 3 Blades
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RMS Pitching Moment, Wind Speed=12 m/s, 2 Blades
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Mean Pitching Moment, Wind Speed=12 m/s, 2 Blades
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RMS Yawing Moment, Wind Speed=12 m/s, 2 Blades
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Mean Yawing Moment, Wind Speed=12 m/s, 2 Blades
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Blade Out-of-plane Moments, 12 m/s, Shear Exponent=0.28,Turbulence=0%, 2 Blades
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Rotor Yawing Moments, 12 m/s, Shear Exponent=0.28,Turbulence=0%, 2 Blades
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Rotor Pitching and Yawing Moments, 12m/s, Shear Exponent=0.28, Closed Loop, 2 Blades
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RMS Pitching Moment, Shear Exponent=0.28, 3 Blades
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RMS Pitching Moment, Shear Exponent=0.75, 3 Blades
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RMS Yawing Moment, Shear Exponent=0.28, 3 Blades
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RMS Yawing Moment, Shear Exponent=0.75, 3 Blades
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RMS Yawing Moment, 8 m/s, 3 Blades, 10% Turbulence
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RMS Yawing Moment, 16 m/s, 3 Blades, 10% Turbulence
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RMS Torque Moment, Shear Exponent=0.75, 2 Blades
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RMS Torque Moment, Shear Exponent=0.75, 3 Blades
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Mean Torque Moment, Shear Exponent=0.75, 2 Blades
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Mean Torque Moment, Shear Exponent=0.75, 3 Blades
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RMS Thrust, Shear Exponent=1.25, 2 Blades
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RMS Thrust, Shear Exponent=1.25, 3 Blades

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