Vehicle-bridge Coupling Vibration Analysis Of High-speed Railway

The speed of trains in modern times are improved continuously with the large number of high-speed railway's production. Together with the large applicationof bridge of high-speed railway,the research of coupled Vibration of Bridge and Carriage of high-speed railway is more and more important. when the train passing the bridge, the bridge will be effected by dynamic impact and generate obvious vibration effect.Thereby affecting to the train and influence the train'traffic safety comfort. The interaction between the vehicle and bridge is called cCoupled vibration of bridge and carriage. it is a dynamics issues combine of randomicity, time-varying and nonlinearity.The coupled vehicle-bridge system in the paper is divided into three parts of vehicle model, bridge model and wheel rail relation and build a vehicle model a dimensional oscillation equation of four-axle and given 5-DOF. The vehicle model established for the 27 freedom in total. Bridge model is discretized by the dynamic finite-element method, establishing its space equation of motion. Wheel rail relation adopt wheeltrack elastic contact theory. As a link with the wheel-rail relationship, couple vehicles and Bridges a system, establish coupled equations and analyze consolidation the system equations according to the sequencing of freedom of the vehicle and bridge. In the end,adopt the fortran languge to preparation computer program, using Integration scheme to calculate the dynamic response of bridge take track irregularity as Input stimulus and reaserching time domain response property of midspan with the speed of 250km/h. Then consider the different speed, different bridge stiffness, different span and different number of spans such four factors'dynamic response of the span of the bridge when they work alone. And discusses the relationship between various factors and the bridge. Finally, draw some meaningful conclusions.I hope these conclusions have important significance and reference value in use for bridge design, train speed control, dynamic performance assessment of the bridge, the train speed and bridge reinforcement.