The polygonal wear of wheels of high-speed trains ,which increases the wheel-rail vertical forces dra-matically , has an adverse impact on the service life of the components of railway vehicles and railsand will seri-ously threaten the running safety . Based on the case of the damage of bogie components of an intercity high-speed train during operation , the vehicle-track coupled dynamics model and w heel polygon irregularity input model were established to investigate the effect of train speed and the amplitude and order number of the wheel polygon on the w heel-rail forces . According to the statistics and experience on danger threshold for reprofiling against the radial jump of the high-speed train wheels ,based on the limit of the vertical dynamic force between w heel and rail and the influence of polygon amplitude on 1~23 order w heels at different speeds , the reprofiling danger threshold for polygonal wheels of high-speed trains was established . The results of the analysis of dan-ger threshold curve show that the small amplitude of the w heel polygon can cause the w heel-rail vertical force to be out of the danger threshold under the high speed and high order polygon wear . The results can provide ref-erence for the maintenance and reprofiling of high-speed train w heels .%列车车轮多边形磨耗会引起轮轨间作用力明显增大,对车辆和轨道部件产生恶劣的影响,严重时将会威胁到行车安全.本文以某城际高速列车在运行过程中发生转向架部件损坏事故为例,建立高速车辆-轨道耦合动力学模型和车轮多边形不平顺输入模型,计算分析列车运行速度、车轮多边形幅值及其阶数(或边数)等因素对轮轨垂向力的影响规律.结合现场高速车轮径跳的镟修期限统计和经验,以轮轨垂向动载荷限值为依据,考虑在不同速度下1~23阶车轮多边形幅值的影响,初步建立高速车轮多边形状态下的安全镟修限值.并通过分析安全限值曲线发现,当列车运行速度越快和车轮多边形阶次越高时,即使很小的车轮非圆化磨耗幅值也能导致轮轨力超出限值要求.本文结果可为高速列车车轮镟修维修工作提供参考和指导.
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