PRIORITY SELECTION TECHNIQUE FOR APPLICATION OF SUPPLEMENTAL SNUBBING TO 100-TON COVERED HOPPER CARS

This report provides a technique for determine those covered hopper cars which have maximum tendency to derail due to harmonic roll. The critical speeds of 100-ton covered hopper cars with various center of gravity heights are determined. Influence of various factors involved in causing derailments is evaluated. Three criteria based on basic parameters - (1) roll angle, (2) wheel lift, and (3) a combined effect of roll angle, wheel lift and lateral acceleration-are used as a guideline for selecting cars which have the greatest need of supplemental damping. It was found that hypothetical cars with the truck center distance close to the standard 39 foot rail length at critical speeds exhibit severe roll oscillations.

• Corporate Authors:

  Association of American Railroads Research Center

  3140 South Federal Street
  Chicago, IL  United States  60616
• Authors:
  • Kasbekar, P V
  • Garg, V K
  • Hawthorne, K L
• Publication Date: 1976-6

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 24 p.

Subject/Index Terms

• TRT Terms: Center of gravity; Covered hopper cars; Damping (Physics); Design; Rocking; Rolling; Snubbers; Suspensions; Train track dynamics; Trucks
• Uncontrolled Terms: Design criteria; Lateral dynamics
• Old TRIS Terms: Resonant speed; Rock and roll; Truck center distance; Wheel lift
• Subject Areas: Design; Motor Carriers; Railroads;

Filing Info

• Accession Number: 00147598
• Record Type: Publication
• Source Agency: Association of American Railroads
• Report/Paper Numbers: R-235 Res. Rpt.
• Files: TRIS
• Created Date: Feb 16 1977 12:00AM