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中文摘要：
基于多体系统动力学理论,分析某动车各构造拓扑关系及其力学特性,利用多体动力学软件UM建立50个自由度的车辆-轨道动力学模型,仿真分析了车辆的非线性临界速度、脱轨系数、振动加速度及平稳性指数等动力学特性,获得了该型动车直线运行的非线性临界速度477km/h;以200km/h的时速通过曲线半径R=4 000m的曲线线路时车体横向、垂向Sperling平稳性指数分别为2.01和1.69;车体横向、垂向加速度分别为0.062g和0.046g;1位轮对的最大脱轨系数和轮重减载率分别为0.182和0.406 4.研究结果表明：该型动车具有较好的动力学性能.
英文摘要：
Based on the multi-body system dynamics theory,the topological relations and mechanical characteristics of a certain EMU are analyzed,a 50degree-of-freedom of the vehicle-track dynamics model is established by the multi-body dynamics software UM,and the nonlinear critical speed,derailment coefficient,acceleration and stability index of the vehicle are obtained by simulation.The results show that when EMU crosses a straight line,the nonlinear critical speed is 477km/h;when EMU crosses the curve whose radius is R=4 000 m with a speed of 200km/h,the lateral and vertical Sperling stability indexes are 2.01 and 1.69;the maximum lateral and vertical acceleration of the vehicle sample point is 0.062 gand 0.046g;the maximum lateral and vertical acceleration of the vehicle body is 0.062 gand 0.046g;the maximum derailment coefficient and wheel load reduction rates of the 1st wheel are 0.182 and 0.406 4.The results show that EMU has better dynamic performance.
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