横风下高速列车通过挡风墙动力学性能

Dynamic Performance of High-speed Train Passing Windbreak in Crosswind

基于列车空气动力学和列车系统动力学数值模拟横风下高速列车通过挡风墙的动力学性能。以运行速度为350km/h的高速列车通过一类挡风墙为例,分析高速列车通过挡风墙的气动力和动力学响应。当高速列车进入和离开挡风墙时,列车的安全性和舒适性指标明显变差。当横风速度为9.56m/s时,车体横向振动加速度最大值达到2.5m/s2;当横风速度为15.0m/s时,列车的脱轨系数超过0.7且轮重减载率超过0.8。在此基础上提出一类具有缓冲装置的挡风墙,使高速列车通过挡风墙时的安全性和舒适性明显改善。

Dynamics of a high-speed train passing a windbreak in crosswind were numerically simulated on the basis of the train aerodynamics and train dynamics. Taking the high-speed train passing a kind of windbreak at 350 km/h for example, the aerodynamic forces and dynamics responses of the high-speed train passing the windbreak were analyzed. When the high-speed train entered the windbreak and left the region of windbreak, the safety and comfort indexes became obviously worse. When the velocity of crosswind was 9.56 m/s, the maximum of the train lateral acceleration reached 2.5 m/s2 ;When the velocity of crosswind was 15.0 m/s, the derailment of train exceeded 0.7 and the wheel unloading exceeded 0.8. At last, a kind of windbreak with buff- er equipment was advanced, which improved safety and comfort effectively when the high-speed train passed the windbreak.