摘要
分析了某型动车组运行过程中发生的异常抖车现象。掌握了镟修周期内车轮型面磨耗特征和轮轨接触关系的演变规律。提出了车轮等效斜度与踏面凹形磨耗之间的估算关系式。通过建立刚柔耦合车辆动力学模型研究了车轮踏面凹形磨耗发展对车辆稳定性的影响。结果表明,随着列车车轮踏面凹形磨耗的增加,使得车轮与钢轨接触的范围变窄,容易发生接触点跳跃现象;同时,车轮踏面等效斜度也会增大,车辆的临界速度会显著下降,使列车运行的稳定性降低。因此,当线路存在较大的激扰时,较大等效斜度工况下的车辆就可能发生车体的异常振动。通过对车轮踏面进行镟修来改善轮轨匹配关系,可解决动车组异常振动的问题。
The phenomenon of abnormal carbody jitter during operation of a type of EMU is analyzed.The evolution law of wheel tread wear characteristics and wheel/rail contact relationship in reprofiling cycle is grasped.The evaluation relation of wheel equivalent taper and tread concave wear is proposed.The influence of wheel tread concave wear development on vehicle stability is studied by establishing a rigid-flexible coupling vehicle dynamics model.Results show that with the increase of train wheel tread concave wear,the contact range between wheel and rail becomes narrower,and the contact point jump phenomenon is easily occurring.Meanwhile,the wheel tread equivalent taper also increases,and the critical speed of vehicle will decreases significantly,lowering train operation stability.Therefore,when there is a relatively large excitation on the line,the abnormal vibration of the carbody may occure in the condition of a large equivalent taper.The wheel-rail mat-ching relationship can be improved through wheel tread reprofi-ling,which solves the problem of abnormal vibration of EMU.
作者
杨陈
贾小平
李龙涛
许旭
苏文静
YANG Chen;JIA Xiaoping;LI Longtao;XU Xu;SU Wenjing(CRRC Nanjing Puzhen Co.,Ltd.,210031,Nanjing,China)
出处
《城市轨道交通研究》
北大核心
2022年第12期257-262,共6页
Urban Mass Transit
