关键词: 风机叶片, 衰减振动, 阻尼比识别, 低阶固有频率识别

Abstract:

First,damping ratio identification formula was derivate by the wind turbine blade attenuation vibration equivalent to the cantilever vibration in order to identify the modal parameters of wind turbine blade.Then,a test platform for large wind turbine blade modal parameter identification was built.The aeroblade 3.6-56.4 wind turbine blade free decay test was finished using rapid unloading device for rapid release of large force.By the damper identification,a law of damping variation was obtained under different initial amplitudes.At the same time,the low-frequency of wind turbine blade was gotten by FFT using the accelerator signals.

Key words: wind turbine blade, attenuation vibration, damping ratio identification, low-frequency identification