等效锥度对高速动车组蛇行运动的影响

The Effect of Equivalent Conicity on Hunting Movement of High-speed EMUs

针对等效锥度对车辆的影响规律问题,长期跟踪测试某型号高速动车组,获得了不同里程下的车轮踏面廓形,匹配车轮与标准钢轨、磨耗钢轨,计算出不同形式的等效锥度曲线,搭建动力学仿真模型,利用实测数据研究等效锥度对车辆蛇行运动的影响。研究表明:车轮在行驶一段时间后会出现不同程度的凹磨现象,与磨耗钢轨匹配后的等效锥度呈现较大的负斜率,会大幅降低临界速度,导致构架横向加速度增大出现二次蛇行运动,蛇行频率出现不同的变化规律。

To solve the problem of the effect of the equivalent conicity on the vehicle,wheel tread profiles at different mileages,matching wheels with standard rails and equivalent conicity curves in different forms caculated by wearing rails are obtained through a long-term tracking tests of a certain type of high-speed EMUs.A dynamic simulation model is built and measured data are used to study the effect of the equivalent conicity on the hounting movement of the vehicle.The research shows that the wheels present different degrees of hollow worn after driving for a period of time,and the equivalent conicity after matching with the worn rail shows a large negative slope,which reduces critical speed drastcally,increases the lateral acceleration of the frame and causes a secondary hunting movement with hunting frequency in different patterns.