Comprehensive examination of dynamic characteristics of a trailer-on-flat-car (TOFC) is conducted in this report using the finite element method. Three basic models or idealizations of the flat car, ranging from a simple beam model to a more sophisticated model composed of plate and beam elements are developed to analyze its dynamic behavior. They are discussed here in some detail. Results of a test program conducted at the Department of Transportation Test Center are used to qualify these models by comparing the predicated vibration mode shapes and frequencies with those observed during the actual flat car tests. In this volume, the flexural and torsional mode shapes and their associated natural frequencies obtained from each of the models are analyzed and compared with experimental results. Analytical results are obtained using SAP4 and NASTRAN finite element computer programs. In a subsequent volume, the forced vibration response, including dynamic stress, will be examined and a demonstration of the application of this analysis to fatigue design evaluation will be carried out.

Media Info

  • Features: References;
  • Pagination: 192 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00170623
  • Record Type: Publication
  • Source Agency: Association of American Railroads Research Center
  • Report/Paper Numbers: R-280 Tech Rpt.
  • Files: TRIS
  • Created Date: Feb 16 1978 12:00AM