AN IMPROVED VEHICLE-TRACK COUPLING MODEL FOR THE PREDICTION OF HIGH-SPEED TRAIN-INDUCED VIBRATION

Abstract eng:
Massive high-speed railways have been constructed and put into operation over the past several decades. Accordingly, the long-term performance of high-speed railways, especially those in soft soil regions, has attracted increasing attention. It’s crucial to investigate the dynamic responses of the vehicle-track-ground coupling system. To overcome the disadvantages of existing theoretical models, which are simplified and consequently cannot well reflect real dynamic responses, a novel two-half vehicle theoretical model is proposed in the paper on the basis of vehicle-track coupling dynamics. The new model accounts for both the interaction between adjacent vehicles via connecting devices and the superposition effect of wheel-rail forces at adjacent wheel sets. As a result, in the case of short-wave irregularity of the track, more accurate wheel-rail forces can be obtained from this model. In addition, with fewer degrees of freedom, this model can take into account several vehicles simultaneously. The wheel-rail forces obtained from this model can thus be a better excitation for the three dimensional finite element model of track-ground coupled system to investigate the system dynamic responses.

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