Dynamic Analysis Of Coupling Vibration In The System Of High-speed Train-ballastless Track-bridge

With the increasing of vehicle velocity, the dynamic interaction betweenhigh-speed train and those structures such as the tracks and bridges, is becoming acrucial problem. The running vehicles shall induce vibration of tracks and bridges, thenthe dynamic reaction of such structures shall influence the running stability and safety.The problems of running stability and safety has been received more and more attention,so the research on influencing factors of vibration in the high-speed train-ballastlesstrack-bridge system is of great significance.The vibration problems of the high-speed train-ballastless track-bridge system andinfluencing factors of running stability were studied in this paper. The main researchwork is as follows:(1) A vertical coupled dynamic model of high-speed train-ballastless track-bridgesystem was established. Using D’Alembert principle, a vehicle model with10degreesof freedom is established. In the model, the steel rail and bridge is considered as a finitesimple supported beam with the model of Bernouli-Euler beam, and the railplate isconsidered as a free-free beam with the model of Bernouli-Euler beam. Considering thedynamic interaction between vehicle track and bridge, vibration equations of high-speedtrain-ballastless track-bridge system was derived. The vibration responses of the wholesystem are obtained by using mode superposition method and the numerical method ofNewmark β.(2) The influence of vehicle suspension parameters on vibration of the high-speedtrain-ballastless track-bridge system is studied. Vehicle vibration and ride comfort areevaluated by the Sperling value. The influence of the primary and the second suspensionparameters on running stability is studied separately, by changing the stiffness anddamping, (3) The influence of track irregularity on vibration of the high-speedtrain-ballastless track-bridge system is studied. The rail corrugation is simulated by theharmonic model. The influence of short wave irregularity and long wave irregularity onvibration of the whole system is studied separately, by changing the wavelength andwavedepth.