小型风力机叶片模态特性及强度分析

Modal Characteristics and Strength Analysis on Small Wind Turbine Blade

以600W水平轴风力发电机(HAWT)叶片为研究对象,基于结构动力学和空气动力学相关理论,利用有限元ANSYS分析软件,首先对叶片在静止和不同转速下的模态特性进行分析和比较,然后根据风力机叶片所受载荷的主要形式,将载荷施加到风力机叶片上,对叶片进行强度分析。结果表明:叶片在旋转状态下的固有频率高于叶片在非旋转状态下时的固有频率,而振型在两种状态下相似。叶片受到载荷后,叶片中部(特别是中部前缘)是叶片易损部位。研究结果对风力机叶片的动力学分析、优化设计及疲劳分析有一定的指导意义。

Based on structural dynamics, aerodynamics and using the finite element analysis software ANSYS, the modal characteristics of 600W horizontal axis wind turbine blade in static and different rotating speeds are studied, and its strength affected by a variety of loads is analyzed. The conclusions are that the natural frequency of the rotating blade is higher than that of the nonrotating blade and the modal shape in two states are similar; the central especially central front of the blade is vulnerable part. These results have certain guidance on dynamics analysis, optimization and fatigue analysis of wind turbine blade.