Analysis of Track Irregularity Spectrum of Shanghai-Kunming and Jinhua-Wenzhou Railways

Abstract:

The difference between China railway track irregularity statistic spectrums and abroad railway track irregularity spectrums is compared first, then, according to the track geometry data measured from Shanghai-Kunming and Jinhua-Wenzhou railways, PSD(Power Spectral Density) and TQI(Track Quality Index) are calculated with Matlab program. The results shows that the former track irregularity spectrum values are much smaller than the US class 6 railway’s, while the latter ones are close to the US class 5 railway’s. The coherence functions are utilized to analyze the relationship between track irregularities and vertical and lateral car body vibration accelerations. Together with car body vibration acceleration spectrum analysis, the conclusion that the range of detrimental track irregularity wavelengths has been drawn, thus providing theoretical and practical guidance for track maintenance and management. Furthermore, the paper calculates the integral of each track irregularity spectrum values. The results show that each TQI has a close relationship with each track irregularity spectrum area. Consequently, it proves the reliability of appraising the track quality with PSD analysis. Finally, the track irregularity spectrum is proposed to be one of the main indexes to control the track geometry for speed-up railway.