Abstract：To accurately analyze the complex and coupled multidirection deformation influence of rubber bushing on suspension and full vehicle performance, a structurebased modeling method of rubber bushing was proposed. According to the real size, material and structure of rubber bushing, a model of flexbody rubber bushing was established. The bushing metal sleeve was substituted by rigid nodes as interface nodes of bushing substructure. Taking the nodes of metal constraints surface as dependent nodes, the MPC between major nodes and dependent nodes was established to realize constraints surface moving together with metal sleeve. Based on CraigBampton, modals reduction of flexbody rubber bushing was conducted to obtain the actual deformation of bushing by modal superposition. The flex bushing was embedded in double wishbone front suspension and multilink rear suspension. Nonlinear relationship curves between suspension C characteristics and bushing stiffness at different load case were obtained. The full vehicle rigidflex coupling model was assembled by front suspension and rear suspension to analyze the relationship between transient handling index and bushing stiffness. The influence of bushing stiffness on full vehicle handling index was ascertained. The results show that the vehicle transient response is improved by changing suspension C characteristics through adjusting bushing stiffness. The acceleration rms of front and rear foot is discrete distribution in the variation range of bushing stiffness.
2015, Vol. 36 
