Analysis of a Teetered, Variable-Speed Rotor: Final Report

Research output: NRELTechnical Report


A computer model of a horizontal axis wind turbine (HAWT) with four structural degrees of freedom has been derived and verified. The four degrees of freedom include flapwise motion of the blades, teeter motion, and variable rotor speed. Options for the variable rotor speed include synchronous, induction, and constant-tip-speed generator models with either start, stop, or normal operations.Verification is made by comparison with analytical solutions and mean and cyclic ESI-80 data. The Veers full-filed turbulence model is used as a wind input for a synchronous and induction generator test case during normal operation. As a result of the comparison, it is concluded that the computer model can be used to predict accurately mean and cyclic loads with a turbulent wind input.
Original languageAmerican English
Number of pages59
StatePublished - 1991

Bibliographical note

Work performed by the Department of Mechanical Engineering, Oregon State University, Corvallis, Oregon

NREL Publication Number

  • NREL/TP-257-4366


  • computer model
  • horizontal-axis wind turbines (HAWT)
  • wind energy


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