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Keywords: track irregularity, power spectral density (PSD), window function, PSD estimation method, median PSD, Beijing-Shanghai high speed railway.

Summary

Based on the research on current common window functions, this paper proposes a new window function. The paper describes the window function, window length and power spectral density (PSD) estimation method to calculate track irregularity PSD. For comparison the track irregularity power spectral densities (PSDs) calculated with different window functions, window lengths and PSD estimation methods. Combing the above mentioned results and the data from the high speed comprehensive inspection train, the paper analyzes the characteristics of track irregularity PSD for the Beijing-Shanghai High Speed Railway and determines the track irregularity PSD fitting equation. The statistic test shows that the track irregularity PSD obeys the "chi squared" distribution with two degrees of freedom and can be described with the track irregularity median PSD. The paper also proposes the coefficients for calculating other percentile PSDs of the track irregularity using the median PSD or the average PSD. By the analysis of the characteristics of the track irregularity PSD for the Beijing-Shanghai High Speed Railway, it can be concluded that: for subgrade sections, the medium and long wavelength irregularity PSDs are slightly larger than the whole line track irregularity PSD except spectrum peaks and troughs, which indicates that the track irregularity conditions in the subgrade sections are slightly worse than those of the bridge sections. The ballastless track on the Beijing-Shanghai High Speed Railway has 6.5m periodic irregularities in the gauge, crosslevel, vertical and horizontal alignment, 32m periodic irregularities in the vertical alignment and 100m periodic irregularities in the horizontal alignment. The track irregularity PSD for the Beijing- Shanghai High Speed Railway can be modelled with a piecewise power function.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 97 Analysis on the Track Irregularity Power Spectral Density of the Beijing-Shanghai High Speed Railway X.B. Liu, H.Y. Li and W.D. Wang Infrastructure Inspection Center, Chinese Academy of Railway Science, Beijing, China doi:10.4203/ccp.104.97 purchase the full-text of this paper Full Bibliographic Reference for this paper X.B. Liu, H.Y. Li, W.D. Wang, "Analysis on the Track Irregularity Power Spectral Density of the Beijing-Shanghai High Speed Railway", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 97, 2014. doi:10.4203/ccp.104.97 Keywords: track irregularity, power spectral density (PSD), window function, PSD estimation method, median PSD, Beijing-Shanghai high speed railway. Summary Based on the research on current common window functions, this paper proposes a new window function. The paper describes the window function, window length and power spectral density (PSD) estimation method to calculate track irregularity PSD. For comparison the track irregularity power spectral densities (PSDs) calculated with different window functions, window lengths and PSD estimation methods. Combing the above mentioned results and the data from the high speed comprehensive inspection train, the paper analyzes the characteristics of track irregularity PSD for the Beijing-Shanghai High Speed Railway and determines the track irregularity PSD fitting equation. The statistic test shows that the track irregularity PSD obeys the "chi squared" distribution with two degrees of freedom and can be described with the track irregularity median PSD. The paper also proposes the coefficients for calculating other percentile PSDs of the track irregularity using the median PSD or the average PSD. By the analysis of the characteristics of the track irregularity PSD for the Beijing-Shanghai High Speed Railway, it can be concluded that: for subgrade sections, the medium and long wavelength irregularity PSDs are slightly larger than the whole line track irregularity PSD except spectrum peaks and troughs, which indicates that the track irregularity conditions in the subgrade sections are slightly worse than those of the bridge sections. The ballastless track on the Beijing-Shanghai High Speed Railway has 6.5m periodic irregularities in the gauge, crosslevel, vertical and horizontal alignment, 32m periodic irregularities in the vertical alignment and 100m periodic irregularities in the horizontal alignment. The track irregularity PSD for the Beijing- Shanghai High Speed Railway can be modelled with a piecewise power function. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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