橡胶衬套对汽车悬架系统NVH性能影响研究

Research on the effect of rubber bushing on vehicle suspension NVH performance

文章研究了悬架系统在不同路面激励下的NVH性能,将工况分为路面随机激励和脉冲激励2类,根据路面形状,脉冲激励又分为三角形凸块和正弦形凹坑脉冲激励(考虑刹车作用)2种。橡胶衬套刚度对悬架NVH性能有很大的影响,采用有限元软件分析其特性。参考有关资料选定对悬架NVH性能影响较敏感的衬套,建立了考虑其影响的半车模型,对比不同模型的仿真结果可以看出,衬套有效改善了悬架的NVH性能。将模型仿真结果与道路模拟机测试结果进行对比,验证了仿真模型的准确性。

In this paper,the suspension NVH（noise,vibration and harshness） performance under different road excitation is researched,and the work conditions are divided into two types,i.e.the road random excitation and pulse excitation.According to the road geometrical shape,the road pulse excitation can be divided into the triangular convex block and the sine pothole excitation（with brake）.Rubber bushing stiffness has a great effect on the suspension NVH performance and its properties are analyzed by the finite element method.By referring to some literature,several bushings which are sensitive to the suspension NVH performance are selected for establishing the half vehicle model with their effects considered.By comparing different model simulation results,it can be seen that the bushings effectively improve the suspension NVH performance.Finally,by comparing the model results with the road excitation machine test data,the accuracy of the simulation model is validated.