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横风下车辆-轨道耦合动力学性能

, PP. 55-60

Keywords: 高速列车,车辆-轨道耦合动力学,空气动力学,横风,运行姿态,车体,轮对,轨道结构,安全指标

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Abstract:

应用多体系统动力学理论,建立了车辆-轨道耦合动力学模型,利用新型显式积分法求解动力学方程组,利用赫兹非线性弹性接触理论计算轮轨法向力,利用沈氏理论计算轮轨蠕滑力,编写了车辆-轨道耦合动力学计算程序,研究了轨道结构对高速列车动力学性能的影响,分析了不同横风环境下高速列车动力学性能和列车姿态。研究结果表明当列车运行速度为350km.h-1,横风速度为15m.s-1时,车体最大横向加速度为0.45m.s-2,车体最大垂向位移为24.5mm,车体向背风侧横移80.0mm,车体最大侧滚角为2.23°;一位轮对的最大轮重减载率接近0.80,二、四位轮对均向背风侧横移,背风侧车轮易发生爬轨现象,二位轮对的横向位移最大,为7.4mm。在横风下,高速列车的运行安全性指标变差,车体振动加速度变化不明显,车体向背风侧横移。在所有轮对中,二位轮对最危险。

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