动车组车辆横向失稳原因辨识方法研究

Identification Method of Lateral Instability Reason of EMU Train

动车组车辆横向稳定性是车辆服役安全的评估指标,曾发生多起横向失稳故障。通过横向失稳的失效链路分析,根据车辆横向失稳的特征频率、振动传递关系,辨识了车辆横向失稳的3类原因。通过轮对、轴箱和构架异常振动,结合车辆运行线路,辨识踏面异常磨耗是车辆横向失稳的主要原因;通过构架和车体枕梁的振动传递关系,辨识蛇行减振器和二系横向减振器阻尼值减小是车辆横向失稳的主要原因;通过构架振动的多边形特征频率,辨识车轮多边形是车辆横向失稳的主要原因。提出的车辆横向失稳原因辨识方法应用于某型动车组,为该型动车组横向失稳原因辨识提供了参考。

Lateral stability is a safety evaluation indicator of railway vehicles. Lateral instability happened to a type of EMU trainsfor several times. By failure chain analysis, three causes of lateral instability were identified. Based on the abnormal vibration ofwheel-sets, axle box and frame as well as the line information, the wheel wear was identified as a main reason of lateralinstability. Based on the transmission relationship of vibration from frame to beam of body, the decrease of damping value of theanti-snake damper or lateral damper was identified as a main reason of lateral instability. Based on the polygon feature frequencyof frame vibration, the polygon wheels were identified as a main reason of lateral instability. The identification method of lateral instability was applied, which provided a reference for identifying the lateral instability reason of EMU trains.