PSD of ballastless track irregularities of high-speed railway

Abstract

The calculation method, fitting function and fitting spectrum of power spectral density (PSD) of track irregularity were proposed in the paper. To improve the calculation accuracy of PSD of track irregularity, a linear interpolation method and a wavelet analysis method are given and used to eliminate the outliers and trends in the track irregularities. The paper describes the window function, window length and 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 determines the track irregularity PSD fitting equation and introduces the frequency multiplication energy table to reflect the impact of track periodical structure of High Speed Railway. PSD of ballastless track irregularities of high-speed railway includes fitting spectrum and frequency multiplication energy table, which provides basis for maintenance and optimization design for High Speed Railway.