【摘要】 为探究等效锥度非线性对车辆蛇行运动的影响，依据高速动车组长期跟踪试验测得的踏面与钢轨轮廓匹配关系，计算得出不同等效锥度曲线。采用非线性轮轨力模型，将锥度作为轮对横向位移的函数，建立具有非线性等效锥度和轮轨力的高速车辆横向动力学仿真模型，分析名义等效锥度以及等效锥度非线性对高速动车组蛇行运动的影响规律，研究列车系统的Hopf分岔规律。研究结果表明：等效锥度的非线性对列车系统的蛇行运动分岔等具有一定的影响，随着等效锥度的降低，其分岔图将越来越复杂。等效锥度曲线的非线性对列车系统的蛇行频率影响不大，但是对列车系统的临界速度有较大的影响。更多还原

【Abstract】 In order to explore the effect of equivalent conicity nonlinearity on vehicle hunting motion, different equivalent conicity curves are calculated based on the matching relationship between the tread surface and the rail profile measured by the long-term tracking test of high-speed locomotives. With the nonlinear wheel rail force model and the equivalent conicity being used as a function of the lateral displacement of the wheelset, a high-speed vehicle lateral dynamics simulation model with nonlinear equivalent conicity and wheel rail force is established, the influence law of nominal equivalent conicity and the equivalent conicity nonlinearity on the hunting motion of high-speed locomotives are analyzed and the Hopf bifurcation regularity of the system is studied as well. The study results show that the nonlinearity of the equivalent conicity has certain influence on the bifurcation of the hunting motion of the train system, and the bifurcation diagram will become more and more complicated with the decrease of the equivalent conicity. Although the nonlinearity of the equivalent conicity curve has little effect on the hunting frequency of the system, it shows greater impact on the critical speed of the system.更多还原