Power Spectral Analysis of Track Irregularity of Wuhan-Guangzhou High-Speed Track

With the rapid development of Chinese passenger line,we have an increasingly higher demand on the track irregularity. In this paper,,track irregularity data measured on Wuhan-Guangzhou high-speed track are used as samples. Based on sample stability test, we use the FFT method for spectral estimation on sample space,and MATLAB programming to get passenger line track irregularity spectral density curve. The studies have shown that the level and direction of the track irregularity spectrum curves continuous 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 Wuhan-Guangzhou passenger line and gain the corresponding parameters. The results of the study have a reference value to track irregularity power spectrum of Chinese passenger line.