关键词: 车辆工程, 悬架, 橡胶衬套, 虚拟样机, 操纵稳定性

Abstract: A mathematical explanation to the mechanism of the effect of the suspension bushing elastic deformation on the vehicle steadystate yaw response behavior was offered. In order to improve the excessive understeering problem in a lightduty passenger vehicle, simulation analyses of the effects of the bushing electricity on the vehicle suspension and the whole vehicle dynamic behavior were realized by the method of virtual prototype combining with the real vehicle prototype testing. Measures to improve the vehicle performance, namely, the adjustments of the bushing elasticities in different locations of the front and rear suspensions, were proposed and their effectiveness were discussed. The results show that enhancing the stiffness of the front end bushing in the upper and lower Aarm of the front suspension is beneficial to the reduction of the target vehicle understeering, but it increases greatly the suspension stiffness, which is harmful to the vehicle riding comfort. Decreasing properly the bushing stiffness in the supporting arm of the rear suspension without much effect on the whole suspension stiffness can decrease the understeering of the target vehicle and improve its yaw behavior.

Key words: vehicle engineering, suspension, rubber bushing, virtual prototype, handling stability