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TECHNICAL PAPERS

Floquet Modal Analysis of a Teetered-Rotor Wind Turbine

[+] Author and Article Information
Karl Stol

National Renewable Energy Laboratory, National Wind Technology Center, 1617 Cole Blvd., Golden, CO 80401-3393 e-mail: karl_stol@nrel.gov

Mark Balas

Department of Aerospace Engineering Science, University of Colorado at Boulder, Boulder, CO 80309-0429

Gunjit Bir

National Renewable Energy Laboratory, National Wind Technology Center, 1617 Cole Blvd., Golden, CO 80401-3393

J. Sol. Energy Eng 124(4), 364-371 (Nov 08, 2002) (8 pages) doi:10.1115/1.1504846 History: Received May 01, 2001; Revised March 01, 2002; Online November 08, 2002
Copyright © 2002 by ASME
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References

Figures

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Reduced-order SymDyn model showing degrees-of-freedom and geometric parameters
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Yaw modal damping variation from conventional modal analysis
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Yaw response due to unit velocity initial condition
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Fan-plot for the 3-dof model (Ω0=57.5 rpm)
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Effect of teeter damping on teeter and differential-flap mode stability
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Effect of precone and teeter stiffness on teeter mode stability
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Effect of yaw stiffness on modal damping
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Effect of yaw stiffness on modal frequencies
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Effect of yaw damping on modal damping
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Effect of yaw damping on modal frequencies

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