RESEARCH PAPERS: Transportation Papers

A Parametric Study to Relate Railcar Speed to Permissible Combinations of Track Geometry Deviations

[+] Author and Article Information
F. Dimasi, H. Weinstock

U. S. Department of Transportation, Research and Special Programs Administration, Cambridge, Mass.

J. Dyn. Sys., Meas., Control 100(4), 252-259 (Dec 01, 1978) (8 pages) doi:10.1115/1.3426376 History: Received September 18, 1978; Online July 13, 2010


A passenger railcar was modeled using quasi-linear, frequency domain computer simulation models to compute lateral and vertical rms wheelset forces and relative displacements over a range of speeds, in response to power spectra representations of track geometry deviations in surface, alinement, and crosslevel. A simplified wheel-climb criterion (Lateral to Vertical Force Ratio, L/V) was used to estimate the margin of safety for wheel-climb and to impose limits on combined track geometry deviations which result in development of lateral and vertical forces which would cause a commonly used threshold value to be exceeded on a statistical basis. “Constant performance” contours of speed versus combined track geometry deviations are developed for selected L/V threshold values and exceedance probabilities.

Copyright © 1978 by ASME
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