三轮摩托车车架分析及优化

摘要

The paper introduced the theories of modal analysis ,built the geometry model of motorcycle frame ,then set with loads and boundary conditions according to the actual situation .Using FEA soft-ware to make the modal analysis in free state and calculate the stiffness of the model in the correspond-ing loads conditions ,and considering the frame’s mode shape and natural frequencies and stiffness , optimization solution was carried out in the same way . The experimental model analysis results showed that the improved structure is effective compared with the original finite element model .%介绍了模态分析的理论基础，建立了某三轮摩托车车架的几何模型，并根据实际情况设定相应的载荷与约束条件，运用有限元分析软件对处于自由状态下的结构进行模态分析、载荷作用下的结构进行刚度分析，综合考虑振型、频率及刚度等分析结果，对车架结构提出优化改进方案，并通过模态试验法验证了结构改进的有效性。