Operating Modes of a Teeter-Rotor Wind Turbine

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

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Bir, G. S. (National Renewable Energy Laboratory) & Stol, K. (University of Colorado at Boulder) February 25, 1999.

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

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OSTI as DE00005063

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  • Operating Modes of a Teetered-Rotor Wind Turbine, Presented at International Modal Analysis Conference, Kissimmee, FL (US), 02/08/1999--02/11/1999

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  • Other: DE00005063
  • Report No.: NREL/CP-500-25983
  • Grant Number: AC36-99-GO10337
  • Office of Scientific & Technical Information Report Number: 5063
  • Archival Resource Key: ark:/67531/metadc695083

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  • February 25, 1999

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • March 31, 2016, 8:15 p.m.

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Bir, G. S. (National Renewable Energy Laboratory) & Stol, K. (University of Colorado at Boulder). Operating Modes of a Teeter-Rotor Wind Turbine, article, February 25, 1999; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc695083/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.