Research On Damping Measures Of Vehicle-Ballasted Track-Bridge Spatially Coupling System

With the constant improvement of train speed and alxe load, because the track structure which lays on the rigid foundation such as bridges, tunnels and culverts has sufficient rigidity and deficient elasticity, it influences safety and stationarity of the running train. And it also aggravates the dynamic response of track strcuture ifself and the rigid foundation. Therefore, we should take some effective damping measures to improve it.According to the vehicle-ballasted track-bridge spatially coupling dynamics theory, a perfect vehicle-ballasted track-bridge spatially coupling dynamics model has been established in this dissertation. And the author has written an corresponding vibration analysis procedure by Fortran. The vehicle-ballasted track-bridge spatially coupling system dynamic performance evaluation index and vibration reduction evaluation indexes are also present in this dissertation.According to the vibration isolation technology of ballasted track, the author has made a simulation on the spatially coupling system using the perfective vibration analysis program under 32m simply supported T type beam respectively installed different stiffness of rail pad, different stiffness of sleeper pad, different stiffness of ballast pad. And then the author get the dynamic response of the components of vehicles-ballasted track-bridge spatially coupling dynamics system. By comparing the dynamic response in time domain and frequency domain, the author get the effect of vibration isolation under the vibration reduction measures and different parameters. The results show that: the track with sleeper pad on bridge increases the sway possibility of carbody, the rail vertical displacement in the track structure with sleeper pad is much larger than that in the common track structure. The installing of sleeper pad reduces the vertical acceleration of the ballast significantly, which on the other hand increases the stress of ballast. The installing of ballast pad improves the stress of the ballast, but at the same time it increases the vertical acceleration of ballast and bridge. Figure:158; Table:37; Reference:84...