Analysis On The Train-Turnout System Dynamics With Variable Cross-Sections

The difference between turnout and usually tracks is not only the cross-sections of rails are varying along track-length but also left and right rail profiles differ. Chinese improved No.18 raising-speed turnout with movable-nose frog model is built up by means of SIMPACK with the variable cross-sections.When a vehicle is passing through the turnout, the loads are supported by the blade and stock rail in switch or by wing rails and flexible frog nose rail in frog. Impacts are happened between the back of the wheel and guard rail. So, multiple contacts between wheel and rail must be calculated.According to the trim sizes and location of the turnout, the divergent track is modeled, it is take into account that the wheel looses its contact to the rail somewhere and the back of the wheel crashes to guard rail.An electric locomotive model is established. The dynamics responses are calculated when the locomotive passing through the turnout with the speed of 80km/h on the divergent route and 200km/h on the major track. It's shown that the simulation results are consistent with the current documents. We can draw a conclusion that the method is quite feasible and the transient impact between the wheel and the switch blade and guard rail can be directly reflected. It is discussed that the parameters of locomotive and turnout structure effect on the vehicle system dynamics.The dynamical characteristics of EMU-turnout systems have been simulated. The results are compared between one vehicle and it in EMU.