定常横风作用下高速列车的安全性分析

基于空气动力学理论,建立高速列车空气动力学模型,计算不同运行速度下高速列车在明线运行和明线横风场景下的气动力荷载。同时采用多体系统动力学理论,建立车辆多体动力学仿真模型。将气动荷载导入车辆仿真模型,计算在无横风和有横风条件下,列车以不同速度行驶时的车辆动力学响应及其安全性指标。获得在无横风和有横风条件下高速列车运行安全性随速度的变化规律。研究结果表明,横风作用将对列车的安全运行构成极大的威胁。参照有关高速列车运行安全性评定标准,给出15 m/s横风风速下高速列车安全运行的速度限值。

SAFETY ANALYSIS OF THE HIGH SPEED-TRAIN RUNNING UNDER THE STEADY AERODYNAMICS FORCES OF CROSS WIND

Based on the aerodynamics theory,the aerodynamics model of high-speed train is established to calculate the train aerodynamic loads at different speeds in the open wire condition and in the cross-wind condition. Also the corresponding vehicle system dynamic model of the high-speed train is built respectively using the multi-body system dynamics theory. The aerodynamic loads are imported to the vehicle dynamic model to calculate the vibration response and the safety index of high speed train at different speeds under and without crosswind. Safety index variations with running speed are obtained and compared between the open wire condition and the cross-wind condition. The numerical results show that the cross-wind turns to greatly threaten the train operating safety. The speed limitation for train safety running at 15m/s cross wind velocity can be obtained reference to the security evaluation standard for high-speed train.