Coupling dynamics performance of vehicle-track under cross wind

A coupling dynamics model of vehicle-track was established by using multi-body system dynamics theory, a new explcit integration method was used to solve the dynamics equations of the model, wheel-rail normal contact force was calculated by using nonlinear Hertz contact theory, wheel-rail creep force was calculated by using Shen-Hedrick-Elkins model, and vehicle-track coupling dynamics program was written. The influence of track structure on the dynamics performances of high-speed train was studied, and the dynamics performances and running attitudes of high-speed train under different cross wind conditions were analyzed. Analysis result indicates that when train speed is 350 km·h-1 and cross wind speed is 15 m·s-1, the maximum lateral acceleration of car body is 0.45 m·s-2, the maximum vertical displacement of car body is 24.5 mm, car body traverses 80.0 mm toward the leeward side, and the maximum roll angle of car body is 2.23. The maximum wheel unloading rate of the first wheelset is close to 0.80, the second and fourth wheelsets traverse toward the leeward side, and the wheels on the leeward side have climbing track phenomenon. The lateral displacement of the second wheelset is largest, and reaches 7.4 mm. Under cross wind, the safety indexes of high-speed train become worse, car body acceleration changes unconspicuous, and car body traverses towards the leeward side. The second wheelset is most dangerous in all wheelsets.