中文摘要：

随着速度的不断提高，轮轨接触关系对列车运行安全性的影响越来越大。当轮轨型面发生损伤后，轮轨非对称接触现象就会产生。轮轨非对称接触现象不仅影响车辆运行的安全性，同时与车轮型面损伤问题也有着密不可分的关系。文章以SS3B型机车为例．建直了由轮轨型面磨耗和轮径差导致的轮轨非对称接触的模型。仿真结果表明当轮轨非对称现象发生后，机车的抗蛇行运动临界速度就会降低，同时，曲线通过的脱轨风险性也会显著增大。

英文摘要：

The influence of the wheel/rail contact relation to the running safety of the train has turn more and more big with the increase of the train running speed. When the wheel/rail surface damage occurred, the wheel/rail unsymmetrical contact was formed. The unsymmetrical wheel/rail contact was not only influence the running safety of the train, but also has a big relation with the wheel surface damage problem. Take type SS3B locomotive for example, the unsymmetrical wheel/rail contact model which caused by the wheel/rail tread surface damage and the difference of the wheel radius were setup. Simulation results shown that the hunting speed of the locomotive maybe decreased and the derailment risk of curve negotiation will increased when the wheel/rail unsvmmetrical contact was formed.