关键词: 悬架系统NVH, 刚柔耦合模型, DOE优化, 橡胶衬套, 有限元法

Abstract:

The suspension NVH performances under different road excitations were researched herein,and the work conditions could be divided into two types, the road random and pulse excitations. According to the road geometrical shape, the road pulse excitations could be divided into two kinds, the triangular convex block and sine pothole excitations(with brake). Rubber bushings have great effects on the suspension NVH performance. The bushing properties were analyzed, and some other suspension parts were flexiblized by one FEM software. The vehicle flexible-rigid coupling models were established herein. By the method of DOE,the sensitivities of the suspension bushing stiffness in different directions towards the vehicle sprung mass vertical acceleration response were analyzed. Then, some rather sensitive parameters were selected for optimization, and by comparing the simulation results of those models before and after optimization, it can be seen that the suspension NVH performance is improved in the middle and higher frequency band. Finally, the simulation results of the flexible-rigid coupling models were compared with the road excitation machine for verifying the correctness of the simulation models. 

Key words: suspension, noise,vibration,harshness(NVH);flexible-rigid coupling model;design of experiments(DOE) optimization, rubber bushing;finite element method(FEM)