跨线运行动车组异常振动问题研究

Abnormal Vibration Problems of EMU Train in the Cross-line Operation

针对跨线运行动车组出现的车辆异常振动问题,通过实测车轮踏面外形、钢轨廓形,以及车辆振动测试,从轮轨接触关系及振动传递特性分析异常振动原因。因线路钢轨廓形不同,导致长期在不同线路运行的动车组车轮踏面最大磨耗位置存在差异,使得车辆在磨耗后期对线路适应性下降。当车辆跨线运行时,由于钢轨廓形变化导致轮轨匹配不良,转向架蛇行运动能量增大。此能量通过二系悬挂传递至车体,引起车体异常抖动。

According to the abnormal vibration problems of EMU train in the cross-line operation, by measuring the wheel tread, rail profile and through vehicle vibration test, the causes of abnormal vibration are analyzed from angles of rail/wheel contact relationship and vibration transmission characteristics. Due to different rail profiles, the maximum wear position change of wheel treads is a long-standing problem for EMU trains running on different lines, leading to vehicle adaptability decline in the later stage of wheel wear. The changes in rail profile cause bad wheel-rail matching when trains running across lines, therefore the energy of bogie hunting will increase and be transferred to the car body by the second suspension, leading to the abnormal car body vibration.