风力机叶片结构强度复合材料力学分析方法研究

截面结构强度分析校核方法是风力机叶片设计优化的关键问题。针对现有的叶片工程力学计算方法精度不高、有限元分析方法计算开销较大的问题,在研究风力机复合材料叶片结构设计模型的基础上,基于复合材料力学理论,推导出计算叶片截面周向各处拉伸和剪切应变的计算公式;在叶片生命周期内的极限载荷下,对某1.5 MW叶片进行了结构强度计算和分析,通过与该叶片在当量极限载荷下的测试结果对比,验证了所述方法的有效性。

THE STRUCTURAL ANALYSIS METHOD OF WIND TURBINE BLADE BASED ON MECHANICS OF COMPOSITE MATERIALS

The method of blade section structural analysis is the key to the optimization design of wind turbine blades.In the existing research methods,the engineering mechanics calculation method based on the basic mechanics of materials has a fast computation speed,while its calculation accuracy is restricted for the approximate equivalent of material structures and attributes.Another method is the finite element method.It was widely used in the structural analysis of blade,but for high time-consuming the modeling and calculating,it's not easily used in the optimization design of wind turbine blades.Based on the study of the laminate structure of the blades,the new method and formulas for calculating the tensile and shear stress of blade sections is developed.Taking a 1.5 MW blade as an example,the structural strength of the blade is studied with the ultimate loads of the blade,and compared with the test result.The feasibility of the new method was verified.