Abstract
This paper deals with response behavior and running stability of the high-speed-moving railway vehicle subjected to seismic excitation. Railway vehicles are modeled by train set model that has 21 degree of freedom per car. The vehicles include some stoppers which modeled as a nonlinear spring in order to limit relative displacements between bodies and trucks or trucks and wheelsets. We investigated the effect of number of cars on running stability of the vehicle using modal analysis in which nonlinear restoring force of stopper is considered. Running stability of the high-speed-moving vehicle is evaluated by the risk rate of rollover of the vehicle. As the number of cars increase, running stability of the vehicle gets decrease in low frequency region. Furthermore, we propose the method of selecting some modes of vibration from all modes to construct the reduced order model of connected-vehicles. It shows that we can approximate the running stability of reduced order model regardless of the number of cars.
