高速运行横向蛇行稳定性一直是机车车辆系统动力学最关注的问题之一。当车辆通过较差线路或外界激扰较大，尤其服役过程中车辆悬挂元件老化故障、轮对踏面磨耗时，车辆横向稳定性不足引发乘坐舒适度降低、加速度报警停车甚至安全事故。为了降低车辆横向稳定性对转向架结构参数变化及外界干扰的敏感度，针对国内近年运行高速动车，项目开展转向架蛇行运动分岔特性研究，提出采用驱动系统悬挂参数优化和主动控制方式减小构架横向振动以提高转向架蛇行运行稳定性的方法。针对简化转向架横向动力学理论分析模型，项目采用并行计算胞映射方法分析转向架的蛇行运动分岔特性，利用基于遗传算法的多目标优化方法实现控制和悬挂参数的优化。基于实际结构的整车多体系统模型与控制联合仿真验证动力学控制优化效果，搭建1:5比例转向架试验台进行构架振动控制试验研究。项目提炼基于构架振动抑制的高速转向架横向稳定性理论，为转向架横向稳定性设计与优化提供理论支持。

The lateral hunting stability of railway vehicle running at high speed is one of the most concerned dynamics problems. When the vehicle runs at poor truck or operating environment, especially the structure suspension parameter changes to worse during service, the deficiencies of vehicle lateral stability will cause poor ride comfort and acceleration alarm even derail accidents. In order to reduce the stability sensitivity to the bogie structural parameters and the outside interference, the project studies the hunting bifurcation and proposes a method about bogie frame vibration suppression based on vibration control or the driving system suspension parameter optimization to improve the lateral stability for the high-speed EMU. For the simplified bogie lateral dynamics model, the cell mapping method based on parallel computing is used to analyze the hunting bifurcation characteristics and the multi-objective optimization method based on genetic algorithms is used to optimize the control and suspension parameters. The vehicle multi-body dynamics model with control is simulated to verify the dynamics control results. The bogie proportion roll rig of 1:5 will be established to test the frame control effects. The project refines the theory about high-speed bogie lateral stability based on the frame vibration suppression, which provide the theoretical support for bogie lateral stability design.