Vibration Control And Dynamics Analysis For High-Speed Railway Vehicle With Flexible Track

The high-speed railway technology has been developed and innovated continuously in recent years and some significant vehicle dynamics problems arise. The force between wheel and rail, running stability, safety and other dynamic indexes of the vehicle in the process of running could be simulated by dynamic simulation of high-speed railway vehicle considering flexible track. The semi-active suspension control technology of railway vehicle has become one of the most effective means to improve the lateral stability of the railway vehicle in order to improve the dynamic performance of high-speed railway vehicle in different line conditions and different speed.The purpose of this thesis is to reduce the lateral vibration of the carbody, improve the safety of the vehicle. The dynamic performance of the high-speed railway vehicle with different suspensions are analyzed comprehensively. The main contents of the study include the following aspects.The rigid-flexible coupling dynamics model of the vehicle-flexible track is established inthe multi-body dynamics software UM using multi-body dynamics research methods.The nonlinear critical speed, running stability, lateral acceleration, vertical acceleration,derailment coefficient, wheel unloading rate and other dynamic performance indexes of high-speed railway vehicle are comparatively analyzed with vehicle-rigid track coupling model and vehicle-flexible track coupling model, respectively. The results show that the nonlinear critical speed is lower with rigid-flexible coupling dynamics model. Vertical ride comfort index is not very different. The difference in lateral ride comfort index and curve negotiation is between 10%?19% and 4%?39%.The theory and basic idea of the semi-active suspension based on skyhook control algorithm are clarified. The UM and Matlab/Simulink co-simulation model is established. The influence of semi-active suspension considering flexible track and rigid track on dynamic performance of high-speed railway vehicle is analyzed. The simulation results show that with semi-active suspension, the lateral ride comfort is reduced by 10.3% and 9.7%, maximum value of wheel-rail lateral force is reduced by 31.2% and 28.6%, wheel-rail vertical force is reduced by 11.5% and 15.9%, wheel-axle lateral force is reduced by 32.3% and 14.7% when the flexible track and rigid track are considered respectively. The ability of curve negotiation is also improved with semi-active suspension compared to the original passive suspension.