Influence of Foundation Deformation and Vehicle Parameters on the Vertical Safety of High-Speed Trains

This paper analyzes the influence of foundation deformation and variation coefficient vehicle parameters on reliability a vertical safety. Based theory stochastic analysis nonlinear vehicle–track coupled systems, combining generalized probability density evolution theory, this takes reduction rate wheel load as measurement index, considering combined effects stochasticity track irregularity, deformation, studies safety under different working conditions. The results showed that (1) compared with up-arch settlement has greater impact operation safety; (2) increase parameters, gradually decreases, so it should be maintenance when setting limits; (3) speed is lower than 375 km/h, more significant safety, while higher amplitude influence; (4) running 350 there may better set to ensure driving It can seen in determination high-speed railway limit value, direction, stochasticity, considered.