采用ANSYS建立了1.5MW直驱风力机多体系统的动力学模型,计算了系统的固有频率,对系统的共振性和稳定性进行了分析,并探讨了在极端运行阵风下风力机系统各部件的瞬态响应振动.分析结果表明：塔架为柔塔,在正常工作转速下风力机能够安全、稳定运转;由于各个部件刚度不同,使得叶片叶尖振动较其它部件复杂,叶尖的振动是受风载作用的三叶片与塔架弹性变形相互耦合作用的结果.最后将植物树干柔性结构应用于风力机塔架的结构设计中,说明了风力机塔架仿生设计的可行性.

In this paper,a dynamic model of the multi-body system of a 1.5MW direct-drive wind turbine is established with the finite element software ANSYS.Then,the natural frequency of the wind turbine is calculated,and the resonance and the stability of the system are analyzed.Moreover,the transient response of each component of the system under extreme operation gusts is discussed.The results indicate that,the tower is flexible;the system is stable and safe at normal working rotational velocity;and that,due to the difference in stiffness of the components,the variation of the tip of the wind turbine blade,which is induced by the coupling of the elastic deformations of three blades and the tower under wind loading,is more complex than that of other components.The flexible structure of the plant trunk is applied to the design of the wind turbine tower,and the feasibility of this bionic design is finally proved.