中文摘要：

为准确预测高速列车轮对擦伤对车辆性能的影响，基于车轨耦合动力学和非赫兹接触理论，对新旧两种轮对扁疤的几何外形进行数值描述，建立了考虑轮对扁疤的高速列车动力学模型，分析了轮对扁疤激扰对车辆走行部的影响。结果表明，旧扁疤对走行部冲击要大于新扁疤，随着扁疤尺寸的增大，走行部各部件受到的冲击载荷与振动加速度逐渐增大；随着速度增大，轮轨间垂向冲击先增大、后减少；当扁疤长度为10mm，速度为100km／h时，轮轨垂向力达到最大值；随着速度增加，走行部簧下部件与簧上部件的振动特性差异不断加大。以轮轨垂向力为判断标准时，轮对扁疤尺寸应限制在30mm以内。

英文摘要：

In order to predict the influences of wheel flat on vehicle performance, based on vehi- cle/track coupling dynamics theory and non-Hertz contact theory, a high-speed train dynamics model was established. The geometric shape of the worn and new wheel fiats were described with mathemat- ical method. The effects of wheel flat dynamic impact on dynamics performance of vehicle running gear were investigated. The results show that： the impacts of worn wheel flats are larger than that of the new ones. With the increase of wheel flat＇s length, there is a gradual increase in wheel/rail impact and vibration acceleration of running gear. When the length of the wheel flat is as 10 mm and the speed is as 100 km/h, the wheel-rail vertical force reaches maximum value. The differences of vibration characteristic between sprung and unsprung parts vary obviously with the changes of the speed. De- fault stting the wheel rail vertical force as the standard, wheel flat size should be limited to 30 mm.