中文摘要：

为了探明梯形轨枕轨道在地铁车辆作用下的振动特性,利用车辆-轨道合动力学理论建立了地铁车辆和梯形轨枕轨道系统振动模型,假设车辆模型为多刚体系统,钢轨模型为无限长两端绞支离散支撑的Euler梁,用有限长两端自由的Euler梁模拟离散弹性支撑的梯形轨枕,利用显式积分法求解车辆-轨道非线性动力学方程,计算分析了梯形轨枕轨道在地铁车辆作用下的振动特性,讨论了轨道系统的振动与列车运行速度之间的相关性。研究结果表明：梯形轨道具有良好的减振性能,可以减小基础的动反力;随着地铁车辆速度的增加,钢轨和轨枕的垂向振动有所增大,而横向振动变化不明显。轮轨力随着车速的升高而增加。

英文摘要：

In order to learn the vibration characteristic of ladder sleeper track under a metro vehicle, based on the vehicle and track coupled dynamics theory, a model is developed to investigate the system vibration of metro vehicle and ladder sleeper track. By assuming that the vehicles are modelled as a full dynamic rigid multi-body system,each rail in the track is modelled as a Euler beam connecting at the discrete fasteners, and the ladder sleeper is considered as an Euler beam with two free ends at the discrete point supporting. Via the explicit integration method, the vehicle-track nonlinear dynamic equations are solved, and the vibration characteristics of ladder sleeper track under metro vehicle are analyzed. The correlation between the track system vibration and the train speed are discussed. The results show that ladder sleeper track has a good vibration at- tenuation and can reduce the dynamic reaction force of the base. With the increase of metro vehicle speed, the vertical vibra- tions of rail and sleeper have more increased, whereas the lateral vibrations of those have no effect. Wheel/rail force increases as the vehicle speed increases.