风力机桨叶的三维建模与动力学特性有限元计算

3D modeling and finite element analysis on dynamic characteristics of wind turbine blade

以结构动力学基本方程为理论基础,将桨叶看成是根部完全固定的悬臂结构,建立了桨叶运动的物理模型和数学模型。以15 kW风力机桨叶为例,在AutoCAD软件中建立风力机桨叶实体模型,并应用国际通用的大型有限元分析软件ALGOR对桨叶在零转速下的振动模态和不同转速下的振动模态进行了计算与分析,分别算出其前5阶的固有频率和振型。对风力机桨叶的频率谱响应进行了分析,得到了激振力作用下叶片的振动位移与应力分布。

According to the theoretical basis based on the fundamental equation of structural dy-namics,a wind turbine blade was treated as a free suspended beam which was entirely fixed on the root.Then the physical and mathematic model of wind turbine blades were built.Blades were Mod-eled in the AutoCAD,the blades of the practical 15 kW wind turbine were used as example.With the aid of FEA software ALGOR,the model of blades were analyzed on the vibration modes which were under irrotating and different rotational speeds.Natural frequencies and mode shapes were calculated.And then frequency response for the baldes of wind turbine were analyzed,and the vi-brant magnitude and stress distribution of the blade were obtained when the blade were under the exciting force.