单点疲劳载荷作用下的风电叶片振动特性研究

STUDY OF WIND TURBINE BLADE VIBRATION CHARACTERISTIC UNDER SINGLE-POINT FATIGUE LOAD DRIVEN

设计一套风电叶片单点疲劳加载系统,基于拉格朗日方程推导出单点疲劳载荷作用下的风电叶片振动数学模型,得到影响叶片振动特性的一系列因素。以一阶固有频率为0.92 Hz的风电叶片为被控对象,利用Matlab/Simulink软件建立仿真模型,得到不同加载频率下风电叶片的振动特性。当加载频率为0.80、0.85 Hz时,加载点振幅均小于300 mm;当加载频率增大到0.95 Hz时,振幅达到较大值,约为400 mm,近似发生共振,能满足疲劳试验要求;当加载频率继续增大到1.00 Hz和1.20 Hz时,振幅反而衰减到220 mm和100 mm。最后进行单点疲劳加载试验,得出试验结果和仿真结果规律基本吻合,验证了数学模型和仿真模型的准确性。

A single-point fatigue loading system of wind turbine blade was designed. Vibration mathematical model of wind turbine blade under single-point fatigue loading driven was derived based on Lagrange equation. The parameters influencing vibration characteristics were obtained. The simulation model of the vibration system was built with Matlab/ Simulink software, and the vibration characteristics of the blade whose first-order natural frequency is 0.92 Hz were obtained. When the loading frequencies were 0.80 Hz and 0.85 Hz, the loading point amplitudes were both less than 300 mm; when the loading frequency was 0.95 Hz, the loading point amplitude reached a large value of about 400 mm and the blade approximately resonated with the loading loading frequencies continued to increase to 1.00 source, which could satisfy the requirement of fatigue test; when the Hz and 1.20 Hz, the loading point amplitudes reduced to 220 mm and 100 mm. At last, a single-point fatigue loading test was conducted, and the test results were consistent with the simulation results, the validity of vibration conclusions have important reference value for mathematical model and simulation model were verified. The above fatigue loading test of wind turbine blade.