FREIGHT CAR TRUCK DESIGN OPTIMIZATION PROJECT. VOLUME III. PHASE I. FREQUENCY DOMAIN MODEL

The frequency domain model computer program developed by the Truck Design Optimization Project (TDOP) simulates the operation of an idealized railroad freight car riding on standard three piece trucks. Given user specified data describing the characteristics and operating conditions of the vehicle, the program utilizes track deflection data prestored on random access disk to generate driving functions for the model. These track deflection data are broken down into frequency components before being used to activate the simulated vehicle. Similarly, the results of program execution are vehicular responses as functions of frequency. The large execution times associated with time domain models are avoided, but the price for this saving is the restriction of the simulations to those idealized conditions that are solvable by linear simultaneous complex equations.

• Record URL:
  https://www.fra.dot.gov/Elib/Document/15948
• 
• Supplemental Notes:
  • See also Volumes 1 through 2 and 4 through 6 in RRIS 02 175504-175505 and 175507-175509 respectively; Bulletin 7802.
• Corporate Authors:

  Southern Pacific Transportation Company

  Technical Research and Development Group
  San Francisco, CA  United States  94105

  Federal Railroad Administration

  Office of Research and Development, 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Publication Date: 1978-2

Media Info

• Pagination: 404 p.

Subject/Index Terms

• TRT Terms: Computer programs; Defects; Degrees of freedom; Design; Dynamic tests; Freight cars; Loads; Mathematical models; Optimization; Railroad cars; Railroad tracks; Research projects; Ride quality; Simulation; Trucks; Vehicle design; Vehicle dynamics
• Identifier Terms: FORTRAN (Computer program language)
• Uncontrolled Terms: Dynamic analysis
• Old TRIS Terms: Freight car design; Freight car dynamics; Track irregularities
• Subject Areas: Design; Motor Carriers; Railroads; Research;

Filing Info

• Accession Number: 00175506
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: FRA/ORD-78/12.III Final Rpt., TDOP-76-126
• Contract Numbers: DOT-FR-40023
• Files: NTIS, TRIS, USDOT
• Created Date: May 31 1978 12:00AM