Dynamics Research On The Wheel-rail System With Elastic Collision

With the rapid development of China railway, vehicle speed has not only bring greatconvenience to people’s life, but also bring many problems. The primary problem facing us isdynamics between the wheel and rail. The stability of the wheel-rail system not only have agreat influence on train running speed, but also related to the operation stability and passengercomfort, even cause accidents. High speed train need to train high hunting critical speed. Highhunting critical speed is needed to high speed train. Therefore, to improve the critical speed oftrain, reasonable train suspension system parameters is to be studied.This paper introduces the theories of vehicle system dynamics models, gives themathematical model and relevant theories, established the two-degree-of-freedom elastickinetic vibro-impact system model on the basis of the wheel-rail elastic collision. Afteranalyzing the nonlinear factors of this model and discuss specific solutions, consultingrelevant literature, the initial kinetic parameters of the vibration system are given. The firstchapter introduces the background, significance and research status at home and abroad. Thesecond chapter analyzes the two-degree-of-freedom system with elastic constants stiffness.After establishing the model, through the global bifurcation diagram, phase diagram andPoincare section to analyze the dynamics of vibration system. The third chapter is on the basisof the second chapter, the principle and procedure are of the same, based on the globalbifurcation diagram and phase diagram of wheel-rail elastic impact system, carried out adetailed dynamics analysis of the wheel-ail elastic collision system, finding out the optimalparameters of the system. Through the analysis of the chaotic trajectory through themechanism of the chaotic behavior of the system, it helps to understand the mechanism ofwheel set derailment, to ensure wheel-rail hunting motion stability under high train speed, sothat better improve the control of train and stability of comfort, improving safetyperformance.