基于流动模拟和动力学仿真的高速列车横风运行稳定性研究

以国产CRH3型3节车编组高速列车为研究对象,利用计算流体力学软件Star-CD/CCM＋计算了在不同横风风速和不同车速下的列车气动力荷载;将该荷载导入动力学仿真软件SIM-PACK的列车运行动力学模型中,计算出在不同横风和车速条件下的脱轨系数、减载率和倾覆系数等运行稳定性参数.计算表明：头车的气动性能和运行稳定性受横风的影响最大;根据车辆动力学性能参数确定的列车安全速度限值与横风风速之间并非线性关系.参照有关高速列车运行稳定性评定标准,给出了不同横风风速下高速列车安全运行的速度限值.

Research on the running stability of high-speed trains under the cross wind by means of simulation

Through making full use of the hydrokinetics and an aerodynamic model of a high-speed train named CRH3 in which contains three vehicles,the aerodynamic loads acting on the car bodies of the train with different speed were calculated with the software Star-CD/CCM＋under the conditions of the cross wind with different velocities.Then the loads were dealt with as the external loads on the train in the dynamic model of the high-speed train including three cars.By dynamic simulation calculating with the software SIMPACK,parameters such as the coefficient of derailment,rate of wheel load reduction and factor of overturning were obtained,and influence of the cross winds on the dynamics of the high-speed train is simulated too.Results show that the influence of the first car of the train on the aerodynamic performance and running stability is greater than of the other cars when the train is running in cross wind.A non-linear relationship between the velocities of cross wind and the speeds of the train is discussed here.With reference to the safe operation criteria for high-speed trains,the maximum safe running velocity of the high-speed train under different-speed cross wind is specified.