DYNAMIC ANALYSIS OF THE VEHICLE–SUBGRADE MODEL OF A VERTICAL COUPLED SYSTEM

As it is known, track transportation can be divided into track system above and track system below. While the train is moving, the parts above and below are subject to interaction and influence. The shortcoming of dynamic analysis in the past cannot usually reflect how the substructure of track including subgrade affects the running train. The analysis mentioned above indicates that the track damage involves not only the failure in strength of components but also the overdeformation or intolerable settlement of the system below track. So, in connection with the train running, taking track–subgrade as a part of vibration structure of the vehicle model, a vehicle–subgrade model of vertical coupled system has been presented. In this paper, the interactions between the vehicle running quality and the subgrade design parameters have been investigated in systematic concept and from the viewpoint of systematic matching.