Research On The Vertical Vibration Transfer Properties Of Ladder Track On Bridge And In Tunnel

With the developing of urban rail transit and the increasing of the environmental protection consciousness, the standard of noise and vibration control has developed. As a new-type vibration reduction rail structure ladder track has been widely applied in urban rail transit in recent years, but it did not work very well on some lines, for example the problems of noise and vibration in metro, and rail corrugation. The vibration isolation performance of ladder track on bridge is not as good as that in tunnel. There are still many indistinct understanding about vibration isolation trackIn order to solve all these problems, in this paper we have established three kinds of3-D dynamic analysis model of ladder track system—ladder track system in tunnel, ladder track system on bridge and ladder track system on ballast in consideration of its different performance on different foundations. By the dynamic finite element analysis, we have got the receptance and vibration modes of ladder track system in different frequence, and researched the vibration transmissibility and vibration reduction property of ladder track system between0-1500Hz.By the research, the reasons why the noise and vibration of ladder track system are so terrible have been found, the indistinct understanding on vibration isolation track has been clarified, and the reason for its different performance on different foundations has been found by the comparison of its vibration transmissibility on bridge and in tunnel, the vibration reduction capability of ladder track has been evaluated in a reasonable way, at last, the influences of parameters of ladder track system on its vibration reduction capability have been found.