复合材料风机叶片结构分析与铺层优化

STRUCTURE ANALYSIS AND LAY-UP OPTIMIZATION OF A COMPOSITE WIND TURBINE BLADE

本文将梁理论应用于风机叶片的结构分析,将叶片视为一个变截面的悬臂梁,对美国可再生能源国家实验室发布的叶片结构分析程序Precomp进行了二次开发,使其不仅能计算叶片截面的刚度,而且还可以计算叶片的固有频率以及极限荷载作用下的变形和应力。基于该程序,对叶片结构铺层进行了优化,提出了梯形截面主梁结构,并减少根部材料消耗。结果显示,优化铺层结构后的叶片重量不仅显著降低,而且不影响叶片的使用性能。

To lighten the weight of a composite wind turbine blade,this work applies a beam theory to redesign lay-up structure of the blade,which is considered as a section variable cantilever beam.A computer program Precomp originally developed by NREL(National Renewable Energy Laboratory of USA) was modified to calculate the blade's stiffness,nature frequency,stress distribution and deflections.Based on the modified Precomp,the blade lay-up structure was redesigned by reducing the root lamination,and by introducing a new trapezoidal girder into use.Results show that the weight of the blade is reduced noticeably after the optimization,whereas the blade structure still has enough stiffness to fulfill application purposes.