Study On Spectrum Composition Of Wheel-rail Force Interaction

ABSTRACT:The high-speed train running on the bridge can cause the vibration of the bridge and the structure can in turn affect the motion of the train. A series of problems can be caused by such vibration. With the continuous improvement of the train speed, the necessity of train-bridge coupling vibration research more significant. This paper focuses on the spectrum composition of wheel-track interaction.This paper mainly chooses the simply supported beam as the research object. Firstly, the wheel-rail force in the time domain can be changed into frequency domain by the FFT, by which the frequency sensitive interval of the wheel-rail force can be well studied. Then, large amounts of wheel-rail force data can be obtained by the "System Separated iteration method", which determined by the different bridge self-vibration frequency and the different train speed. The 1/3 octave band is used in this paper to analysis the spectrum composition of the wheel-rail force interaction. Based on such practical ideas, general rules of the bridge vibration can be got. In this dissertation, a program of 1/3 octave band is written with the Matlab, by which the frequency response curves are smoothed. Based on this program, software designed for the wheel-rail system make it convenient to solve the problems. The bridge self-vibration frequency and the train speed can be directly input to the software. Then the new wheel-rail force data can be able to reconstruct, which can be used in the bridge engineering. A regression analysis of mass data is made in this paper and the general formulas are summarized.The research achievements are used in analyzing the bridge dynamic response at different cases when two trains are meeting on the bridge. The method of spectrum analysis for the wheel-rail force has been successfully used in the bridge engineering.