Modelling Of Random Vertical Irregularities Of Railway Tracks
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Department of Structural Dynamics, Wroclaw University of Technology, 27 Wyspiańskiego Street, PL-50370 Wroclaw, POLAND
Online publication date: 2015-09-19
Publication date: 2015-08-01
International Journal of Applied Mechanics and Engineering 2015;20(3):647-655
The study presents state-of-the-art in analytical and numerical modelling of random vertical irregularities of continuously welded ballasted railway tracks. The common model of railway track irregularity vertical profiles is applied, in the form of a stationary and ergodic Gaussian process in space. Random samples of track irregularity vertical profiles are generated with the Monte-Carlo method. Based on the numerical method developed in the study, the minimum and recommended sampling number required in the random analysis of railway bridges and number of frequency increments (harmonic components) in track irregularity vertical profiles simulation are determined. The lower and upper limits of wavelengths are determined based on the literature studies. The approach yields track irregularity random samples close to reality. The track irregularity model developed in the study can be used in the dynamic analysis of railway bridge / track structure / highspeed train systems.
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