Truck hunting, or secondary hunting, is inherent with vehicle design and is characterized by severe oscillations of the truck or wheelset relative to the carbody. Once truck hunting starts, it continues to worsen as locomotive speed increases. This program predicts critical velocity at which oscillations become unstable and provides information about mode shape and oscillation frequency. Input consists of physical constants characterizing suspension elements and wheel/rail interactions, along with a velocity range to be investigated. One use of this program is a design tool which allows one parameter of the suspension to be varied to study its influence on critical speed. This manual presents a summary of the model, describes required input and the programs output along with interpretations. Some typical runs are also presented.

Media Info

  • Features: Appendices; Figures;
  • Pagination: 182 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00196447
  • Record Type: Publication
  • Report/Paper Numbers: AAR R-227
  • Files: TRIS
  • Created Date: Jul 31 1979 12:00AM