TWO, THREE AND FOUR AXLE RIGID TRUCK CURVE NEGOTIATION MODEL. PROGRAMMING MANUAL

The rigid truck curve negotiation computer model is designed to model a rigid locomotive truck on a portion of curved truck under any set of arbitrary operating conditions that may be found during normal railroad operations. Due to the nature of the model, the problem to be solved is statically indeterminate. This requires that the method of solution be of an iterative technique combined with a numerical analysis approach. Because this is a static model the actual computation sequence is basically straightforward, however, due to the many different positions that the truck may take during curving, there is a great complexity in insuring that the particular solution arrived at is unique for the situation being modeled. This can be accomplished through an iterative-feedback method such that the output from the preceding iteration is used as an input to the succeeding iteration until both force-moment equilibrium and geometric compatibility are maintained from one iteration to the next. By geometric compatibility, it is meant that at the point of solution the flange force reactions correspond to the points of flange contact that would be predicted using a geometric model based on the friction center location and rubber donut deflections that result from the force model. When this situation is achieved, the solution is unique and may be used with a high degree of confidence.

• Supplemental Notes:
  • SUPPLEMENTAL NOTES: See also User's Manual, AAR Report R- 205, RRIS 02 139449.
• 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:
  • Smith, K R
  • MacMillan, R D
  • Martin, G C
• Publication Date: 0

Media Info

• Pagination: 18 p.

Subject/Index Terms

• TRT Terms: Computer programs; Flanges; Force; Heavy duty trucks; Locomotives; Mathematical models; Railroad rails; Railroad wheels; Steering; Three axle trucks; Train track dynamics; Trucks by number of axles; Two axle trucks; Vehicle design; Wheels
• Uncontrolled Terms: Lateral dynamics
• Old TRIS Terms: Four axle trucks; Ibm 370; Locomotive design; Wheel flange forces
• Subject Areas: Design; Motor Carriers; Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00139450
• Record Type: Publication
• Source Agency: Association of American Railroads
• Report/Paper Numbers: No. R-205
• Files: TRIS, USDOT
• Created Date: Oct 26 1976 12:00AM