Vibration Analysis of Track Structure for High-Speed Railway Based on Fourier-Transform Method

By means of establishing the continuous elastic 3 layers beam model for track structure with random irregularity of track vertical profile, the vibration equations of the track structure are transformed by Fourier Transform. The vibration displacements in Fourier Transform domain are solved with this transformed equation. Then, the vibration responses of the track structure are obtained by performing Inverse Fast Fourier Transform. This technique is applicable to any complicated dynamics problem of the track structure. Vibration responses of track structure stimulated by several of existing high-speed Electric Multiple Units in China are calculated in this paper, vibration velocity and acceleration of track structure are got by analyzing the displacement. Analyzed each sub-structure vibration of track when a train passing by. Influences of track irregularity and train velocity on track response are investigated. Some track vibration regularities of high-speed railway are obtained at the end of this paper.