Low-frequency Vibration Mitigation Performance of Floating Slab Tracks with Inerter Enhanced Dynamic Vibration Absorbers
Floating slab track(FST)amplifies low-frequency vehicle-rail coupling vibrations,which results in a problem of low-frequency environmental vibrations.Introducing the inerter enhanced dynamic vibration absorbers(IDVA),this paper proposed the FST-IDVA to mitigate the low-frequency resonance of FST under the moving train.The dynamic e-quivalent single degree of freedom system of the FST was derived theoretically.Considering the random property of the wheel-rail interaction,the H2 optimization theory was employed to optimize the IDVA to provide a theoretical solution for the optimal parameters of the IDVA.A vehicle-rail coupling simulation program based on the joint operation of Matlab-Ansys was developed to simulate the dynamic responses of the vehicle-rail system during the operation of an 8-car train.Compared with the FST without DVA,FST with small and large DVAs,the superior vibration mitigation performance of the FST-IDVA was validated.Numerical results show that,under the moving vehicle load,the acceleration responses,support force of the steel spring and the total force of a single FST transferred to the ground of the FST are suppressed clearly when the IDVA is equipped.Thanks to the dynamic mass effect of the inerter,the relative displacement between the dynamic vibration absorber and the FST is suppressed more than 50％.Using this method,better low-frequency vi-bration mitigation performance can be obtained in the limited space of the FST.
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