Theory And Application Of Train-Track-Bridge Coupling Vibration In High-Speed Railways

With its comprehensive advantages such as the high speed, large transport capacity, low energy consumption, light pollution, less occupation of the land, high safety and comfort performance, the high-speed railway has been developed rapidly all over the world. C hina h as i mproved t he t rain s peed greatly b y following a nd s tudying t he technology of high-speed railway abroad, positive planning high-speed railway, building new fast passenger traffic special line and strengthening technological alteration of existing railway. However, the corresponding problems like the interaction forces between trains and tracks, the safety and comfort of the runnine train, the reliability of tracks and bridges are even more conspicuous and these problems still lack enough theoretical research and engineering practice i n China. Therefore, the study on the dynamic interaction between trains, tracks and bridges under the fast and high-speed running train is one of the basic research subjects to meet the need of achieving great-leap-forward development of railway in China. This thesis briefly reviews the domestic and abroad technical development o f the high-speed railway, the history and the current situation of the vehicle-track dynamics and the vehicle-bridge vibration, on the basis of which, directed at the train-track-bridge coupling dynamical system of the high-speed railway, the thesis proposes the following thinking of research: regarding the vehicle dynamics, track dynamics, finite element method of bridge vibration as the foundation, regarding the interaction of wheels and rails, the interaction of track and bridge as the relation, and regarding the rolling stocks , tracks and bridges as a whole system, the dynamic characteristics of the track and bridge structure and the safety and comfort of the running train can be studied by the numerical simulation method. The validity and perfection degree of the train-track-bridge coupling dynamics model plays a decisive role in the dependability and accuracy of the simulation result. At first, a relative perfect four-axle rolling stock and six-axle locomotive dynamics model of the high-speed railway is set up in this thesis. In this model, the rolling stock is regarded as the multiple rigid body system, and all kinds of movements of the car body, bogie and wheel-set and various sorts of non-linear factors in vehicle suspension system are fully considered. In this thesis, a detailed dynamics model of various kinds of tracks laid on the bridge such as ballast track, REHDA track, slab track, elasticity supported block track and all kinds of roadbed-bridge transition structure of the high-speed railway is established for the...