Abstract:In order to analyse the vehicle vibration responses due to high frequency excitations accurately, the influences of the elastic deformation of main vehicle parts and tracks were comprehensively considered. Based on the rigid-flexible coupling dynamics theory, main components in a vehicle dynamics model such as carbody, bogie frame, axlebox and wheelset were modeled as flexible bodies. And the slab track was treated as a flexible structure system where the rails were built as two discretely supported continuous beams, and the slab was modeled using 3D solid finite element method. By using a single sine function to describe rail corrugation, its influences on vehicle dynamic responses were analyzed. Also the influences of the speed, wavelength and depth of rail corrugation on vehicle vibration behaviors were investigated. The numerical simulation results indicate that rail corrugation can result in the periodical oscillations of wheel/rail interaction forces and vehicle dynamic responses. The wheel/rail force increases slowly with the increase of speed at first, then grows sharply, but when the speed exceeds a certain value, the force has a slow increase trend again. At a certain speed the serious elastic vibrations of the bogie frame end and axlebox cover can occur due to rail corrugation. The wheel/rail force increases with the increase of the rail corrugation depth, but decreases with the increase of the rail corrugation wavelength.
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