Research On Uniformity Stiffness Of Road-Culvert Transition Section In Raising Speed Existing Rail Line

At first, the road-culvert transition section is defined and the associated road-culvert transition section problems are presented. The worldwide present situation of study of vehicle-track coupling dynamics and the construction technology plan of uniformity stiffness on transition section is summarized.According to the general principles of forming model of vehicle-track coupling system and the assumption of simplifying calculate, the model of coupling vibration of vehicle and ballast aggregate track is established. It includes models of the train, rail, sleeper-roadbed and wheel/rail contact. The simulation calculation procedure is prepared. A new explicit integration method is used to working out the differential equation of coup- ling vibration system.The principles and steps of the methods were introduced, the sixth grade track ire-gularity PSD of U.S. railway samples in time domain were achieved by simulating trigonometric series respectively, the samples were taken as the inputting disturbances of a vehicle-track vertical dynamics model, the time response courses of vehicle system we- re obtained by numerical simulation.Using this model and the computational procedure, the required compute contents and conditions are given in light of the situation of the track transition. The dynamic responses of the track and the vehicle on track transition are obtained under different work conditions.