横风下桥梁高度对高速列车交会性能的影响

Influence of bridge height on passing performance of high speed trains under crosswind

为研究横风下桥梁高度对高速列车会车性能的影响,基于空气动力学和列车系统动力学,分析指数风分布下不同高度桥梁周围的流场,建立高速列车多体系统动力学模型,模拟横风下列车在不同高度桥梁上会车时的表面压力特性和气动载荷特性.将得到的气动力作为外加载荷作用于列车上,分析桥梁高度对高速列车会车安全性能的影响.结果表明:当列车在环境风下交会时,背风侧列车的气动力波动大于迎风侧列车的气动力波动;当监测点风速固定且桥梁高度小于15 m时,随着桥梁高度的增加,列车的气动载荷最大幅值和安全指标最大幅值均有所减小;当桥梁高度为15～30 m时,随着桥梁高度的增加,列车的气动性能和动力学性能基本保持不变.

To study the influence of bridge height on passing performance of high speed trains under crosswind,based on aerodynamics and vehicle system dynamics,the flow field around the bridges with different height is analyzed under index-wind distribution,and the multi-body system dynamics model of high speed train is built to simulate its surface pressure performance and aerodynamic load performance when trains pass by each other on the bridges with different heights.Taking the aerodynamic force obtained by the simulation as the additional load,the influence of bridge height on passing safety performance of high speed trains is analyzed.The results show that,when trains pass by each other under ambient wind,the aerodynamic fluctuations of the train on the leeward side are bigger than that on the upwind side;when the wind velocity on the monitoring points is fixed and the bridge height is less than 15 m,the maximum amplitudes of aerodynamic loads and safety indices of the trains decrease with the increase of bridge height;when the bridge height is between 15 m and 30 m,the aerodynamics performance and dynamics performance of the trains remain unchanged with the increase of bridge height.