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Power spectral analysis of track irregularity of passenger line

LI Ji-yang1,LIU Lin-ya1,KOU Dong-hua2(1.Engingeering Research Center of Railway Environment Vibration and Noise Ministry of Education, East China Jiaotong University,Nanchang 330013,China; 2.Wuhan Railway Bureau,Wuhan 430000,China)  
In this paper,track irregularity data measured on Qinhuangdao-Shenyang Passenger Line and Wuhan-Guangzhou high-speed track were used as samples.Based on sample stability test,we used the FFT method for spectral estimation on sample space,and MATLAB programming to get the track irregularity spectral density curve of the passenger lines.The study has shown that the level and direction of the track irregularity spectrum curves continuously change,which includes many harmonic components of different magnitude and wavelengths.The wavelength range is relatively wide,and high frequency spectral density curve of the track whose level and direction are irregular is relatively smooth,and low-frequency part contains the complex periodic waveforms.This paper means to fit two spectral density curves of two passenger lines and gain the corresponding parameters.The results of the study have a reference value to track irregularity power spectrum for Chinese passenger line.
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