Technical Reports

An Investigation of Techniques for Validation of Railcar Dynamic Analyses

  • 01
  • Mar
  • 1978
AUTHOR: Federal Railroad Administration; W. J. Fallon; N.K. Cooperrider; E. H. Law
OFFICE: RPD
SUBOFFICE: RPD-11
REPORT NUMBER: FRA/ORD-78/19
SUBJECT: Rail and Infrastructure Integrity
KEYWORDS: Rail vehicle dynamics, Validation techniques
ABSTRACT: A linear model of the vertical dynamics of a railcar was validated by the application of spectral techniques to experimental data. Track input spectra were computed from test track surface measurements gathered in the TDOP test program. Acceleration measurements of a freight car were used to compute vehicle acceleration spectra in response to the test track. The corresponding response of the linear model was computed from the analytical transfer functions and experimental track input spectra. Validation of the linear model was based upon a comparison of corresponding analytical and experimental vehicle acceleration spectra. The truck suspension was isolated and analyzed from experimental measurements of corresponding truck and car body accelerations. Spectral functions were employed to evaluate the assumptions of suspension linearity.

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