车辆的操纵稳定性是整车性能的重要组成部分，通常在车辆悬架与副车架系统中常将副车架作为刚性连接进行研究的，然而前副车架在实际的行驶过程中会发生弹性变形，对某车型的前副车架进行柔性化处理，建立刚柔耦合整车模型来研究整车的操纵稳定性具有重要意义。基于该模型对整车进行横向动力学分析，推导出了三自由度车辆运动学方程，进行了车辆运动学仿真对比分析，研究该前副车架柔性对悬架系统KC特性与整车瞬态操纵稳定性的影响。运用NSGA-II算法进行悬架参数优化设计，对整车的瞬态操纵稳定性进行优化。优化结果表明：在0.5HZ时，横摆角速度相对于方向盘转角增益降低8%，车身侧倾角相对于侧向加速度增益降低了1.1%，侧向加速度相对于方向盘转角延迟时间减少了10.5%。

Vehicle handling stability is an important part of the vehicle performance, usually in the vehicle suspension and subframe system often subframe as a rigid connection for research, however, the front subframe will be elastic deformation in the actual driving process, the front subframe of a certain model of flexible processing, the establishment of rigid-flexible coupling vehicle model to study the handling stability of the whole vehicle is of great significance. Based on this model, the lateral dynamics of the whole vehicle is analyzed, the three-degree-of-freedom vehicle kinematics equations are derived, and the vehicle kinematics simulation is conducted for comparative analysis to study the influence of the front subframe flexibility on the KC characteristics of the suspension system and the transient handling stability of the whole vehicle. The NSGA-II algorithm is used for the optimal design of suspension parameters to optimize the transient handling stability of the whole vehicle.The optimization results show that at 0.5 HZ, the yaw rate gain relative to the steering wheel angle is reduced by 8%, the body 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%.

U27 ??????

国家自然科学基金项目（面上项目，重点项目，重大项目）