Study on Vibration Characteristics and Damping Effect of CRTSⅢ Slab Ballastless Track

To study the vibration characteristics and damping effects of CRTSⅢ slab ballastless track, a coupled dynamic model of vehicle and track based on multi-body dynamics and finite element theory was established, and the dynamic responses of the track structure were analyzed under different stiffness of the damping pad layer, and its damping performance was studied.The results show that the damping pad layer has a certain vibration isolation effect between the track structure layers.With the increase of the damping pad surface stiffness, the acceleration and displacement of the base plate increases, the displacement of the steel rail, the displacement of the track plate, and the acceleration of track plate decreases; The rail vibration acceleration level changes little with the damping pad surface stiffness, the track plate vibration acceleration level decreases with the increase of the damping pad surface stiffness, and the decreasing trend is more obvious in the frequency band above 10 Hz, and the base plate vibration acceleration level increases significantly with the increase of the damping pad surface stiffness; The vibration acceleration level of the track structure attenuates from top to bottom, and the transmission loss from rail to track plate and from track plate to base plate shows a trend of ebb and flow; The smaller the stiffness of damping pad is, the better the damping effect of slab ballastless track is.The damping effect of the damping CRTSⅢ slab ballastless track is better in the frequency band of 25～200 Hz.The maximum damping occurs at 63 Hz, and the damping effect in the frequency band below 25 Hz is general.