Torsional Oscillations of the Rotor Disc for Horizontal Axis Wind Turbines with Hinged or Teetered Blades, Part 12

摘要

The coupling of torsional oscillations of the rotor disc and the blade motions was analyzed for horizontal axis wind turbine hinged or teetered blades. The blades and the tower were assumed to be perfectly rigid. The vibrational analysis was linear and the antisymmetric blade flapping motion was found be decoupled. Expressions for the eigenfrequencies of the system were obtained. Analytical solutions were constructed for forced vibrations due to gravity, wind shear and tower shadow. Large resonant torsional responses were found to be possible. Numerical examples are presented.