不同边界条件下汽车前副车架模态分析

Modal Analysis of Automotive Front Subframe under Different Boundary Conditions

为指导副车架模态分解及目标设定,改善副车架动态性能,探讨了不同边界条件下汽车前副车架模态特性。用HyperMesh软件建立了副车架仿真模型,对服役状态和刚性状态边界条件进行正交试验设计,用OptiStruct软件对副车架模态进行了数值计算和对比分析。结果表明,车身连接点刚度的处理方式是决定副车架模态特性的主要因素,而下控制臂、稳定杆及转向器连接点橡胶衬套刚度是影响副车架模态特性的次要因素,不同的边界条件下副车架模态差异较大,要依据具体边界条件来进行副车架模态分解及目标设定。

In order to guide the subframe modal decomposition and target setting,and improve the subframe dynamic performance,the modal characteristics of the front subframe of the vehicle under different boundary conditions are discussed.The subframe simulation model is established by HyperMesh software,the orthogonal experimental design is carried out for the boundary conditions of the service state and the rigid state,and the numerical calculation and comparative analysis of subframe modalities are carried out by OptiStruct software.The results show that the stiffness of the body connection point is the main factor to determine the modal characteristics of the subframe,while the stiffness of the rubber bushings of the lower control arm,stabilizer bar and steering gear connection point is the secondary factor to influence the modal characteristics of the subframe.In addition,the subframe modalities vary greatly with different boundary conditions,so that the subframe modal decomposition and target setting should be made according to the specific boundary conditions.