智能复合材料风力机叶片设计与有限元分析

摘要

With the increasing size of wind turbine blades,the need for more sophisticated load control techniques has induced the interest for aerodynamic control systems with build-in intelligence on the blades.New structural concepts have emerged where multifunctional materials,exhibiting a strong coupling between its mechanical response and its electrical behaviour,which work as sensors and actuators,are embedded or bonded to composite blades for high-performance structural applications.A finite element model of the smart blade for wind turbines is provided.Numerical analysis is performed by using finite element method,which is used to calculate the time response of the model.The displacement and stress response from the piezoelectric actuator are obtained to control the vibration,and compared with the fluid calculation results of the aerodynamic stress.By using this model,an active vibration method which effectively suppresses the vibrations of the smart blade is designed.%随着风力发电机叶片的大型化,将智能材料粘贴在叶片表面或嵌入叶片内部形成新的结构,智能材料作为传感器和作动器.设计了小型风力发电机叶片及其智能夹层结构,用有限元分析软件Algor分析埋入的压电材料逆压电效应下的应力、位移,并与气动力作用下的叶片流体计算结果进行对比.分析实现叶片振动主动控制的可行性,以防止叶片这一弹性体发生颤振.