Simulation Study On Dynamic Performance Of Curve Parameters Of High-Speed Railway

High-speed railway is a great achievement of railway technology. With the sharply increase of train running speed, the dynamic interaction between vehicle and the supporting structures is much more strengthed, and especially more complicated in the curve segement. Owing to the complicated wheel/rail dynamic interaction not considered in traditonal design method of railway alignment parameter, the effects of route alignment parameters on running performance of vehicle can not be estimated exactly. In order to consider the dynamic interaction between vehicle and the supporting structures in railway locating, and make the designed alignment parameters more reasonable and effective, it is very necessary to study railway alignment parameters by the dynamic performance of vehicle and supporting structures.As a basement of relative study works, and based on the analysis of feature of curve segment and formerly vehicle-track coupling system, the motion state of each part of vehicle and supporting systems is analyzed in particular in this thesis. The dynamic models of vehicle, curve ballasted track structure, and ballastless track structure are built separately. Mathematical analysis about track irregularity is simply introduced. A dynamic calculation method of parameters of wheel/rail contact interation online is discussed and tested detaily. By numerical simulated and programming, the vehicle-track coupling systems of ballasted track and ballastless track are tested and compared to some reference, and the results demonstrate that the models in this thesis can better reflect the dynamic characteristics of vehicle-track coupling systems.The dynamic characteristics of vehicle-track coupling system on curved track of high-speed railway are simulated systematically. And the effects of plan curve parameters and the velocity vehicle running on the respones of the coupling system are obtained under conditions that different supporting structures and different values of track irregularity. As a result, some basic proposals about selection of plan curve parameters are given, which are expected to provide some basis and reference for high-speed railway route design.