高速铁路竖曲线参数取值与动力学分析

基于车辆-轨道耦合动力学理论,采用仿真软件研究不同运行条件下高速列车通过竖曲线起点时的动力学性能,并计算得出高速铁路竖曲线的最小半径和最小长度的推荐值。结果表明:车体垂向振动加速度随竖曲线半径的增大而下降,与纵坡坡度的关系不明显;为保证旅客的舒适度,运行速度250,300,350 km/h分别对应的最小竖曲线半径推荐值为14,21,29 km;竖曲线起点引起的车体振动衰减时间服从正态分布,与竖曲线半径、纵坡坡度以及运行速度的关系不大;为避免车体振动叠加,行车速度为350 km/h时,竖曲线最小长度应不小于110 m,在线路条件较好时应不小于120 m。

Determination of High Speed Railway Vertical Curve Parameters and Dynamic Analysis

Based on the theory of vehicle-track coupled dynamics and by using simulation software,this paper studied the dynamic performances of high speed train passing through the starting point of vertical curve under different operating conditions,and determined the recommended values of the minimum radius and the minimum length of high speed railway vertical curve.The results show that the vertical vibration acceleration of vehicle decreases with the increase of the vertical curve radius,and its relationship with the gradient of longitudinal slope is not obvious.To ensure the comfort of the passengers,when the operating speed is 250,300,350 km/h,the corresponding recommended value of the minimum vertical curve radius is 14,21,29 km respectively.The decay time of the vertical vibration caused by the starting point of the vertical curve obeys the normal distribution and has little relation with the radius of the vertical curve,the gradient of longitudinal slope and the operating speed.To avoid superposition of vehicle vibration,when the driving speed is 350 km/h,the minimum length of vertical curve should not be less than 110 m,and it should not be less than 120 m when the line condition is good.