Abstract: Based on the theory of vehicle track coupling dynamics, the vertical vehicle-track coupling dynamic model is established and finite element beam model of sleeper is developed. Under the wheel flat initial velocity excitation model and the wheel flat displacement excitation model, vehicle/track dynamic responses are calculated and compared with the responses of the dynamic model with the mass model of sleeper. The results indicate that the sleeper model has little effect on the wheel/rail force, but the vibration results of each sleeeper’s different part are calculated at different time with the finite element beam model of sleeper. So the sleeper’s velocity distribution are available and the data preparation can be made for the track radiation noise.

Key words: Sleeper model, Timoshenko beam, Vehicle-track coupling dynamics, Wheel/rail noise, Coupled plate, Energy transmission coefficient, Vibration, Energy finite element analysis