复合材料风力转筒结构应力特性分析

Analysis of Stress Characteristics of Composite Wind Rotary Drum Structure

为保证复合材料转筒结构的安全性,对其应力特性进行分析。针对新型复合材料风力转筒结构建立有限元数值分析模型,采用线性弹簧单元模拟底部限位轮装置,将模态分析结果与测试结果进行对比验证该数值分析模型的准确性;针对复合材料外筒和加强筋初始设计方案,系统开展结构应力特性分析、优化和结构强度评估。研究结果表明:在极限工况下,旋转作业时离心力对外筒应力的贡献度最大,其次是风压作用;转筒最大应力出现在外筒上,最大变形发生在顶部盖板上;铺层角度是外筒设计的关键要素,新的正交铺层方案下最大应力值有所减小,但最大变形位移显著大于角铺层方案;3种铺层方案下的复合材料转筒均能满足强度要求。

In order to ensure the safety of the composite rotary drum,the stress characteristics are analyzed.The finite element model(FEM)is established for the new-type structure of the composite rotary drum.The linear spring elements are used to simulate the effect of bottom wheels.The accuracy of the FEM is verified by comparing the mode shape and natural frequency between the numerical and experimental results.Then,the structural stress characteristics analysis,optimization and strength evaluation based on the initial schemes of the composite rotary drum and the ring rib are systematically studied,and the following conclusions are conducted.First,under extreme working conditions,the centrifugal force contributes the greatest stress of the rotary drum,followed by the contribution of wind power.Then,the maximum stress occurs on the rotary drumand the maximum deformation occurs on the top cover plate.The angle of layer is the key factor in the design of rotary drum.The maximum stress value is reduced in the new orthogonal layer scheme,but the peak value of deformation displacement is significantly higher than that in the angular layer scheme.Three schemes evaluated above can all meet the strength rules.