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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

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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