The Research On High-speed Railway Vehicle-bridge Coupling And Its Application

The train running on the bridge can cause the vibration of the bridge and the vibration of the bridge can in turn affect the motion of the train. This is called'vehicle-bridge coupling vibration'. With the speed of trains increasing and the bridge structure being employed in the high-speed railway, to study the dynamic interaction between trains and bridges becomes more important. Thus, more and more attention is paid to research on vehicle-bridge dynamic analysis and it is necessary to analyze the'vehicle-bridge coupling vibration'.Based on the general study of historic and current researches in China and abroad in the field of train-bridge interaction system, using the coupling thought of vehicle and bridge, the dynamic interaction model of the train and high-speed railway bridge is established and the analysis software is programmed in this thesis. Besides, the effects of trains on the high-speed railway bridges are studied. The main content is as following:1.The dynamic analysis model for vehicle-bridge coupling system is established in this paper. The vehicle-bridge coupling system is divided into three subsystems: the train subsystem, the bridge subsystem and the wheel-track subsystem. For the train subsystem, four-axle rolling stock with two stage suspension is the central object being studied and a space vibration analysis model constituting of such rigid bodies as carriage, bogie frame and wheel is built. The dynamic analysis models are established. For the bridge subsystem, the dynamic analysis model for bridge structures is established, using the finite element method. And the dynamic equations of the bridge structures are derived, using the D'Alembert principle. For the wheel-track subsystem, the detailed geometric relation of contact and the trace method to the arbitrary profile are given in this paper. In the determination of the wheel-rail forces, the vertical interaction is treated by the nonlinear interaction elastic Hertz contact, and the horizontal interaction is treated by the creep theory. The wheel-rail forces are calculated by the iterative procedure.2.The procedure of the vehicle-bridge coupling vibration is given; the forms of the external force and the equivalent node force of bridge are deduced in this paper. The methods (the Newmark-βmethod and the Wilson-θmethod) which are used to solve the oscillatory differential equations of train and bridge system are deduced in this paper. The dynamic equations of the vehicle and the bridge are solved through the iterative procedure. In this paper, the force-convergence-criterion is selected to end the iterative loop. The train-bridge dynamic analysis program is worked out and the process how the program works is introduced in this paper.3 . The analysis software for vehicle-bridge coupling vibration system is introduced in this paper. The structure, the function and the interface of the software is introduced in this paper. And the definite train and bridge models are built in this paper in order to text the software4.The train runnability on the bridge is analyzed concisely. The simple model of vehicle and the bridge is built in order to study the effect of train running speed, the amplitude of the track irregularity and the period of the track irregularity on coupling vibration response of the train- bridge system.