为研究高速列车车轮多处扁疤引起的动力学问题,建立了CR H 2型动车组的车辆轨道动力学模型及车轮扁疤模型.采用变轮径扁疤模拟法,分析单处和两处扁疤的车轮引起的轮轨冲击响应,确定车轮两处扁疤时的扁疤长度、车速及扁疤间夹角变化对轮轨冲击的影响,进而确定CR H 2型动车组安全运行时车轮扁疤限值,为高速动车组列车的行车安全提供了依据.%In order to study the dynamics issues of high-speed train wheels with multiple flats,a dynam-ics model of CRH2 EMU and wheel flat model was developed.The simulation method that changed wheel ra-dius to simulate wheel flats was applied.By analyzing the wheel-rail impact response caused by single flat and two flats,the effects of wheel/rail impact caused by the changes of flat lengths,train speeds and phase angles of multiple flats were determined,and the wheel flat limit was determined under CRH2 EMU safely running. These provide a basis for safe running of high-speed trains.
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