基于参数化建模的风力机叶片性能分析

针对现有850kW风力机叶片，分析其材料、结构及铺层状态，对比传统叶片有限元模型，将描述叶片主要结构的弦长、扭角采用分段函数形式表达，采用MATLAB编程并结合ANSYS二次开发建立风力机叶片参数化几何模型.基于动量-叶素理论的BLADED软件计算叶片各截面处的极限载荷，并于叶片分段施加载荷增量.动力学分析得到叶片前三阶挥舞和摆振频率及一阶扭转频率，其与实测固有频率比较，分析并验证叶片于共振区外运行.静力分析得到叶片挥舞位移及关键部位应力分布，通过最大应力准则和蔡-胡(Tsai-Wu)准则对翼面进行强度校核(其他部位同理校核)，表明叶片在极限状态下仍能保持安全运行.该研究描绘了叶片主要力学性能，为叶片进一步优化奠定了基础.

Performance Analysis of Wind Turbine Blade Based on Parametric Modeling

In view of the existing 850kW wind turbine blade， the material， structure and layer condition were analyzed， compared to the traditional blade finite element model. The chord length and twist which mainly described the structure of blade were expressed by using piecewise function expression form， and the parameterized geometric model of wind turbine blade was found through MATLAB and ANSYS to accomplished secondary development. The ultimate load of every section was solved by BALDED which basing on blade element momentum theory， and the increasing load was applied on the every part of blade. The first three waves and shimmy frequencies and the first torsion frequency were obtained through dynamic analysis， which comparing with the measured natural frequencies. The blade working outside the resonance region was proved. The distances of wave and stress distribution of key parts were received by static force analysis， and the wing surface was strength checked through maximum stress criteria and Tsai-Wu criteria(other parts in the same way). It showed that the blade could keep operate safely under limit state. The research describes the main mechanics performances of blade， and it lays the foundation for the blade to be optimized further.