Effect of wind loads with different time-domain characteristics on the safety of high-speed trains

In order to study the influence of wind loads with different time-domain characteristics on the operational safety of highspeed trains, an aerodynamic model of high-speed trains is established by STAR-CCM+, which simulates wind loads at different speeds and outputs aerodynamic forces and torques that are loaded onto the high-speed train dynamics model established by SIMPACK. In different speed intervals, certain working conditions are simulated by controlling the loading time, duration time, and introducing various track irregularities to carry out fluid-structure coupling offline simulation. The results of analyzing the safety indexes of high-speed trains under different working conditions show that: under the condition of constant wind speed, the maximum derailment coefficient is mainly affected by the loading time of wind load, and the shorter the loading time is, the larger the maximum derailment coefficient is; the effect of duration is smaller, mainly due to the effect of local track irregularity within the duration; the changes of other safety indexes are similar to the maximum derailment coefficient, and the shortest loading time of each safety index is not the same; track irregularity will make the maximum safety indexes larger, which puts the high-speed train in a more dangerous state. The higher the car speed, the larger the contribution rate of track irregularity.