The Research On The Vibration Property Of Slab Tracks With Different Rubber Vibration Isolation Bearings

With the development of the urban transit system, more and more concerns are placed on the vibration isolation technology of rail transit structures. Through the dynamic tests on the Rheda 2000 vibration isolation track structure in the Underground Engineering Laboratory in Beijing Jiaotong University and the theoretical simulation analysis, this dissertation discussed the influence of change of different parameters, especially the parameter of different rubber vibration isolation bearings, on the dynamic property and the vibration isolation effect of the slab track, which can further contribute to developing the slab track with rubber vibration isolation bearing on our own. The concrete work is as follows:First, hammer excitation test based on impact method is used for the dynamic test of the Rheda 2000 vibration isolation track structure in order to determine the parameters. Second, a 3D finite element model is built based on the prototype of the mentioned slab track above to modal analyze the former structrue, which performed to obtain the natural frequencies and the vibration modes of the slab track with different paramenters. Third, the transfer property is analysed based on the resonant principle to discuss the dynamic responses and the vibration isolation effect of the slab track with different parameters. Finally, according to the impulse principle, the dynamic responses of the slab track under an impact load with different track parameters are studied from both the time-history and spectrum analyses perspectively. Although this dissertation is based on the Rheda 2000 track system, this study result provides some reference value for other mass-spring vibration isolation track systems.