基于AOSO递进优化方法的车体抖振控制研究

Carbody chattering control based on AOSO progressive optimization method

针对某型动车组在运行中出现的车体抖振伴随转向架蛇行运动的整车异常振动现象,对车辆进行在线试验,发现大踏面锥度状态的车辆在较高速度工况运行时,存在稳定性不足,致使转向架的蛇行频率不断上升与车体菱形模态频率接近,继而引发车体的抖振。为了提升车辆运行的稳定性,提出一种融合解析优化和仿真优化的两级递进优化方法(Analytical Optimization and Simulation Optimization,简称为AOSO),对抗蛇行减振器参数进行优化,并在车辆线路试验中验证优化的效果。结果表明,优化后磨耗轮状态下车辆的临界速度得到显著提升,转向架已无明显的蛇行运动、车体抖振也得到明显改善。

Aiming at the abnormal vibration phenomenon of the carbody in the operation of an electric multiple unit,which is the carbody chattering accompanied by the bogie hunting movement.An online test on the vehicle is conducted,and it is found that the vehicle with a large tread conicity state exhibits insufficient stability when running at a higher speed,causing the hunting frequency of the bogie to continuously increase and approach the diamond-shaped deformation modal frequency of the carbody,consequently leading to the carbody to chatter.To improve the running stability of the vehicle,a two-step progressive optimization method that combines analytical optimization and simulation optimization is proposed to optimize the parameters of the anti-yaw damper,the method is abbreviated as AOSO.Furthermore,the optimization performance is experimentally verified.The results indicate that after optimization,the critical speed of the vehicle under the condition of worn wheel is significantly improved,there is no obvious hunting motion of the bogie,and carbody chatter is significantly decreased.