风力发电机旋转叶片振动分析

摘要

With ANSYS software, through FLM, gravity and centrifugal force is exerted on 20kW horizontal axis wind turbine rotating blades ,and blade modeling and meshing is carried on,with the finalization of the prestressed state vibration modal analysis,its previous ten bands vibration frequencies and mode shape are achieved.With the vibration data and vibration analysis,the results show that the blade vibration is mainly waving,shimmy,and torsional vibration,and the vibration energy is concentrated in the first and second order,with the main vibration forms are waving and shimmy.Based on the first and second modes of vibration,the actual natural frequency can be required. The error between experimental results and theoretical value is very small,only -3.5%,indicating that the experimental method is feasible,accurate experimental results,and its security and stability in the run-time is verified,and these experimental data on research and development of wind turbine blades have a certain significance.%利用ANSYS软件,通过FLM,对20kW水平轴风力机旋转叶片施加了重力和旋转离心力,并进行叶片建模和网格划分,最后完成预应力状态下的振动模态分析,得到了其前十阶振动频率和振型.针对得到的振动数据和振动特性进行分析,结果表明叶片的振动主要有挥舞、摆振和扭振,振动能量集中在一、二阶,而主要振动形式是挥舞和摆振.依据一、二阶振型可以得到其实际固有频率,实验结果和理论值误差很小,只有-3.5％,说明实验方法可行,实验结果准确,并对其运行时的安全稳定性进行了验证,这些实验数据对风力机叶片的研究开发具有一定的指导意义.