微型客车车身疲劳寿命有限元分析

摘要

Based on theories of finite element,multi-body dynamics and fatigue,the fatigue life of a minibus body under the load of B-level pavement is predicted with the material S-N curve,structural unit load stress and bus-body load spectrum,which realize combining simulation among the software of Hypermesh,MSC.Nastran,ADAMS/Car and MSC.Fatigue.The research results can provide technical supports for the design and improvement of the bus-body structure while we don′t rely on the prototype of a minibus.In order to accurately simulate the performances of the body and the chassis,the leaf-spring and the body are considered as flexible structures to establish rigid-flexible coupled multi-body dynamic model in this paper,so as to generate much more accurate simulation results.%基于有限元、多体动力学及疲劳相关理论,结合材料的S-N曲线、结构单位载荷应力场和车身载荷谱,预测了某微型客车车身结构在B级路面载荷作用下的疲劳寿命。实现了HyperMesh、MSC.Nastran、ADAMS/Car及MSC.Fatigue软件间的联合仿真,减少了对样车的依赖,为车身结构的设计与改进提供了基于CAE疲劳分析的技术支持。为了准确模拟车身和底盘的性能,将板簧和车身做了柔性体处理,建立了刚柔耦合的整车多体动力学模型,以便能更精确地对该车进行仿真分析。