Wheel/rail geometric constraint relationships, such as the effective conicity and gravitational stiffness, strongly influence the lateral dynamics of railway vehicles. The principal curvatures of wheel and rail profiles are important parameters in the determination of creep coefficients used in rail vehicle models. In general, these geometric constraints and profile curvatures are nonlinear functions of the wheelset lateral displacement. This report is a users' manual for a computer program written in FORTRAN IV that uses iterative procedures to determine these nonlinear functions for arbitrary wheel and rail profiles. The program computes the wheel/rail contact positions, geometric constraint functions, and profile curvatures for any given wheel profile, rail profile, rail cant angle, and rail gauge for an asymmetric wheelset on asymmetric rails. Analytical methods used and program input and output are described. Results are in the form of printout, punched cards and drum plotter plots. The users' manual includes program listings, sample deck set-ups, and sample run output.

  • Record URL:
  • Supplemental Notes:
    • Prepared for U.S. Department of Transportation, Federal Railroad Administration, Office of Research and Development, Washington, D.C. Prepared in cooperation with Association of American Railroads Research Center, Chicago, Illinois.
  • Corporate Authors:

    Clemson University

    Department of Mechanical Engineering
    Clemson, SC  United States  29631

    Arizona State University, Tempe

    Department of Mechanical Engineering
    Tempe, AZ  United States  85281
  • Authors:
    • Heller, R
    • Cooperrider, N K
  • Publication Date: 1977-12

Media Info

  • Media Type: Digital/other
  • Features: Figures; References;
  • Pagination: 98 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00179121
  • Record Type: Publication
  • Source Agency: Federal Railroad Administration
  • Report/Paper Numbers: FRA/ORD-78/05 Intrm Rpt.
  • Contract Numbers: DOT-OS-40018
  • Files: TRIS, USDOT
  • Created Date: Jul 29 1978 12:00AM