Technical Reports

Freight Car Dynamics: Field Test Results and Comparison with Theory

  • 01
  • Jun
  • 1981
AUTHOR: N. K. Cooperrider, E. H. Law, R. H. Fries
OFFICE: RPD
REPORT NUMBER: FRA/ORD-81/46
SUBJECT: Evaluation
KEYWORDS: Rail Vehicle Dynamics, Validation Freight Car Trucks, Computer Simulations
ABSTRACT: Field tests of a'conventional rail freight car were conducted to provide data for comparison with theoretical analyses of rail freight car dynamic behavior. These tests, carried out by the Association of American Railroads and the Union Pacific Railroad, were designed to provide experimental information concerning moda damping, modal frequencies* mode shapes, motion amplitudes, critical hunting speeds wheel-rail forces, and creep coefficients for comparison with theoretical results. Alternative techniques for theoretical freight car analysis, data processing, and comparison of theory and experiment are discussed. The 80-ton open-hopper test car parameters, the wheel-rail and roadbed geometry, the test conduct and the data analysis procedures are described. Field test results in the form of time series data, RMS values, modal frequency and damping characteristics, and spectral analysis results are presented and discussed. Comparisons of test results with theoretical results of linear eigenvalue analyses, quasi-linear random response analyses, and hybrid computer simulations are given.
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