FRATE (Freight Car Response Analysis and Test Evaluation) is the name of a digital computer program which numerically solves the structural dynamic equations of motion of a single railroad freight car excited by wheel/rail interface motions. The Federal Railroad Administration (FRA) has sponsored its development for the purpose of applying it to freight car analysis and test problems. This manual has been written with the objective of providing the user with all of the detailed information needed as concisely and accessibly as possible. To this end the manual has been divided into two volumes: Volume I is a User's Manual containing basic user related information, Volume II is a Technical Manual Containing more detailed technical information. FRATE is written to allow the simulation of a broad range of freight cars by only simple input data changes. A Trailer-on-Flatcar (TOFC) configuration is simulated in this manual. FRATE solves the equations of motion in the time domain and includes the following features; (1) nonlinearities which presently include separations, bilinear springs and no small angle assumptions, (2) five degree-of-freedom coordinate coupling (longitudinal motions have been omitted), (3) normal mode structural flexibility and (4) frequency response from simulated sweep testing. Although it has not been included in this report coulomb damping has been included and used in a trial version of FRATE.

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  • Supplemental Notes:
    • Prepared for U.S. Department of Transportation, Federal Railroad Administration, Office of Research and Development, Washington, D.C.
  • Corporate Authors:

    Mitre Corporation

    1820 Dolley Madison Boulevard
    McLean, VA  United States  22102
  • Authors:
    • Kachadourian, G
    • Sussman, N E
    • Anderes, J R
  • Publication Date: 1978-9

Media Info

  • Features: Figures; Tables;
  • Pagination: 97 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00188675
  • Record Type: Publication
  • Source Agency: Federal Railroad Administration
  • Report/Paper Numbers: FRA/ORD-78/59 Tech Rpt., MTR 7889, VI
  • Contract Numbers: DOT-FR-54090
  • Files: TRIS, USDOT
  • Created Date: Feb 27 1979 12:00AM