Simulation Research On The Dynamic Characteristics Of Vehicle-Track Coupling System On Curved Track And The Vibration Response Of Ballastless Track Strucure Of Passenger Traffic Railway

In the thesis, based on the dynamic model research of formerly vehicle-track coupling system, the motion state of each part of the system is analyzed in particular. The dynamic models of vehicle structure, curve ballasted track structure, ballastless track structure are built separately. Mathematical analysis about track irregularity is simply introduced. Rail/wheel contact interaction is expatiated, and then rail/wheel contact model adopting FEM to calculated rolling contact progress is brought forward. Explicit method is used for calculation, and contact constraints are enforced with the contact penalty function method, contact surface weighting method & tracking approach are used to judged contact state, contact tangent action is described by corresponding sliding formulation.The vehicle-track coupling systems of ballasted track and ballastless track are simulated respectively. By contrasting the simulation result with test data, the models in the thesis can better reflect the dynamic characteristics of vehicle-track coupling systems. Simulation results are close to actual data.The dynamic characteristics of vehicle-track coupling system on curved track of passenger traffic railway are simulated systematically. The dynamic characteristics of the coupling system between 300km/h motor train unit with diversified power supply and the curve track are analyzed. Vibration response of curve track coupling system is obtained.By means of vehicle-track coupling system models of ballastless track structure on passenger traffic railway, when 300km/h motor train unit passes by with the velocity of 200-350km/h, the vibration responses of slab & twin-block ballastless track structure on soil subgrade are simulated. The simulated result is analyzed systematically, and the similarities and differences of the dynamic characteristics between slab and twin-block ballastless track structure are compared. The quantized analysis of the elastic difference among ballasted track, slab ballastless track and double ballastless track is carried out.