Abstract: Firstly, the FEM model of the bogie of the car is established and the modes are calculated in the FEM software. Secondly, the multi—body vehicle dynamic system model is set up in which the carbody, axleboxes and the wheelsets are taken as rigid body and the bogie of the truck is regarded as elastic one. With time integration, the structural vibration of the railway bogie and dynamic responses of the other parts of the car are achieved while the vehicle negotiates a curve and runs on straight track with the stochastic excitation. Finally, the dynamic stress distribution characteristics of the bogies in time domain are obtained after the dynamic responses of the bogies are input to the FEM. In this process, not only the more accurate dynamic responses of the bogies can be acquired, but also the dynamic stress distribution and the structural vibration of the railway bogie can be achieved. For one thing, this research technology combines the elastic body with the rigid one as a tightly system. For another, it is very useful to obtain the dynamic stress and evaluate the service life of bogie in its structural design stage. This simulation technology can also be fully used in other mechanical research fields such as road vehicles, military tanks and aeronautic machines.

Key words: Bogie, Dynamic stress, Service life, Simulation, Structural vibration