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对某高速动车组的车体异常振动进行了车轮踏面测量、车体振动的在线跟踪测试、调头运营以及镟修前后的车体振动对比分析。轮轨磨耗导致轮轨匹配关系在局部区段发生变化,从而导致等效锥度增大影响了车辆的动力学性能;车体异常振动主要表现为9.5 Hz左右的谐振响应,其中调头运营不能解决车体异常振动的问题,但是镟修车轮却能够有效改善车体异常振动问题。得出车体异常振动的根本原因在于轮轨关系的不匹配,从而导致轮轨激扰向上传递引起车体的局部共振。因此不论镟修车轮还是打磨轨道都可以通过改善轮轨匹配关系最终消除车体的异常振动问题。
The abnormal vibration of the body of a high-speed EMU was measured by the wheel tread, the on-line tracking test of the vibration of the body, the alignment operation and the comparison of body vibration before and after repair. Wheel-rail wear causes the wheel-rail matching relationship to change in the local section, which leads to the increase of equivalent taper, which affects the dynamic performance of the vehicle. The abnormal vibration of the car body mainly shows the resonance response of about 9.5 Hz, Body abnormal vibration problems, but 镟 repair wheel but can effectively improve the body vibration problems. It is concluded that the root cause of the abnormal vibration of the vehicle body is the mismatch between the wheel-rail relationship, which leads to the local resonance caused by the upward transmission of the wheel-rail disturbance. Therefore, regardless of 镟 repair wheel or grinding track can ultimately eliminate the abnormal vibration of the body by improving the relationship between wheel and rail.