QUASI-STATIC LATERAL TRAIN STABILITY MODEL. PROGRAMMING MANUAL

The "Quasi-Static Lateral Train Stability Model" models a train for a force equilibrium condition. The model consists of two principal parts, the TRACK coordinate generation program and the TRAIN program. The TRACK program produces in coordinate form, the track section along which the train consist is to be simulated. The TRAIN program then models the train consist, usually at various positions on the track. The TRACK program establishes coordinates of the continuous track including tangents, spirals, curves, and combinations of them. The TRAIN program consists of a coupler "submodel" and a vehicle "submodel". The coupler submodel calculates the lateral force at the coupler pin due to drawbar forces and also computes coupler angles and alignment control moments. The vehicle submodel develops the lateral loads at the bolster centers using the lateral forces developed in the coupler submodel. Equilibrium is established if the directions of the bolster lateral loads and the bolster displacements are the same. If equilibrium is not achieved, the positions of the units are changed and same procedure repeated until an equilibrium is attained. An independent L/V ratio calculator is also available. Both TRACK and TRAIN programs have been operated on an IBM 370/158 using the level G Fortran compiler. Maximum core required for execution was 292K bytes (Train).

• Supplemental Notes:
  • See also User's Manual, AAR Report R-207, RRIS 02-139451.
• Corporate Authors:

  Association of American Railroads Research Center

  3140 South Federal Street
  Chicago, IL  United States  60616

  Federal Railroad Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  Railway Progress Institute

  801 North Fairfax Street
  Alexandria, VA  United States  22314

  Transportation Development Agency Centre

  800 rene-Leveque Boulevard West, Suite 600
  Montreal, Quebec H3B 1X9,   Canada 
• Authors:
  • Thomas, L R
  • MacMillan, R D
  • Martin, G C
• Publication Date: 0

Media Info

• Pagination: 28 p.

Subject/Index Terms

• TRT Terms: Coefficients; Computer programs; Couplers; Derailments; Force; Overturning; Railroad rails; Railroad tracks; Structural design; Superelevation; Train operations; Train track dynamics
• Identifier Terms: FORTRAN (Computer program language)
• Uncontrolled Terms: Lateral dynamics; Track geometry
• Old TRIS Terms: Ibm 370; Rail overturning; Train performance
• Subject Areas: Design; Highways; Railroads;

Filing Info

• Accession Number: 00139452
• Record Type: Publication
• Source Agency: Association of American Railroads
• Report/Paper Numbers: No. R-208
• Files: TRIS, USDOT
• Created Date: Oct 6 1976 12:00AM