Research on Dynamic Performance of No.18 Turnout of Passenger Dedicated Line at 400 km/h

Currently, among the high-speed turnouts laid in China, the self-developed passenger dedicated line series has laid 8000 groups, accounting for more than 60 %.The research and development of high-speed EMUs with a speed of 400 km / h has been fully carried out, but there is no high-speed turnout suitable for this speed standard.Addressing the gap, this paper focuses on No. 18 turnout of passenger dedicated line and establishes a rigid-flexible coupling dynamics model for the vehicle-turnout system to study the dynamic performance of the train crossing the turnout under operation conditions of 400 km/h.The dynamic performance of the turnout system is evaluated from wheel-rail interaction, safety indicators and stability indicators.Significant fluctuations are observed in wheel-rail interaction at the switch area and frog area during the transition over the switch rails and point rails, but all remain within safe limits.The trend in safety indicators is similar to that of vertical and lateral wheel-rail forces.All stability indicators meet the requirements.As train speeds increase, the vertical forces during straight and lateral crossing of the turnout noticeably intensify.