Keywords: railway vehicle, flexible carbody, hybrid multibody system, rubber damper modeling.

A simple way to reduce the influence of equipment to carbody vibration is to introduce elastic suspension. But if the suspension parameters do not match the carbody structure, there are significant vibrations in the carbody. Nowadays rubber springs found in rail vehicles serve as part of the equipment suspension system. These components generally can provide flexibility in all three directions, but its dynamic performance is complicated. So in order to obtain precise results when simulating the dynamic behavior of railway vehicles, it is necessary to develop accurate models for the equipment suspension that play an important part in the dynamics of the vehicle. In this paper a nonlinear model of the equipment suspension is developed which allows its performance to be reproduced accurately. A hybrid model of the vehicle including track, wheel-sets, suspension, bogie frame, and flexible carbody is set up using the commercial software SIMPACK. The vehicle is described as a system of multibody interconnected using various suspension elements. With the nonlinear model of the equipment suspension, the influence of equipment suspension parameters on car body vibration are analysed. The last part of this paper concerns the on-line testing of the dynamic performance of the CRH380B EMU on the Beijing-Shanghai line. The simulation results are compared with the test results.

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