前副车架对整车操纵稳定性的影响分析及优化

打开文本图片集

中图分类号：U463 文献标志码：A 文章编号：1000-582X（2025）07-038-12

Analysis and optimization of the effect of front subframe on the handling stability of the whole vehicle

GAO Jin，LIU Wei （Faculty of Transportation Engineering，Kunming University of Science and Technology， Kunming 650500，P.R.China）

Abstract：Vehicle handling stability isan important part ofthe vehicle performance.In the vehicle suspensionand subframesystem，subframe isoften studiedasarigid connection，however，the front subframe undergoes elastic deformation inactual driving proces.Therefore，this paper flexibly treats the front subframe of acertain vehicle andestablishes a rigid-flexible coupled vehicle model to study the handling stabilityof the wholevehicle.The lateral dynamics of the wholevehicleis analyzed，the three-degree-of-freedom vehicle kinematics equations are derived，and the vehicle kinematics simulation is conducted forcomparativeanalysis to study the influence of the front subframe flexibility on the KC characteristics ofthe suspension system and the transient handling stability of the wholevehicle.The NSGA-II algorithm is applied to optimize the bushing stiffness atthe front subframe joint， which improves the transient handling stability of the whole vehicle. The optimization results show that at 0.5Hz the yaw rate gain relative to the steering wheel angle is reduced by 8% ，thebody roll angle relative to the lateral acceleration gain is reduced by 1.1% ，and the lateral acceleration delay time relative to the steering wheel angle is reduced by 10.5% ：

KeyWords： front subframe; rigid-flexible coupling;finite element analysis;transient handling stability；multiobjective optimization

随着汽车行业对整车性能的需求不断增加，副车架结构已经广泛应用于各种车型上[]。（剩余11945字）