DAMPING REQUIREMENTS TO CONTROL VERTICAL AND ROLL MOTION OF FREIGHT CARS

Compression dampers located in the freight car spring group can effectively control the car body in the roll and vertical motion modes resulting from the more common track surface variations. Computer drawn traces show the motion and forces between car body, truck components and track resulting from a multi-degree of freedom, three-dimensional, mathematical model of a 100 ton freight car traversing track with defined surface variations. Comparisons of response resulting from hydraulically controlled springs and a conventional spring group suspension controlled only with coulomb friction shows generally that conventional suspension with only friction damping, results in a severe resonance for both vertical and roll modes with extreme weight shift and high reactions between freight car components and track - a resonance limited only by the system non-linearities. Single acting hydraulic damping can be defined with sufficient energy absorption that can limit forces and motion at each given resonance, reducing weight shift and derailment jeopardy, as well as, equipment and track damage.

• Supplemental Notes:
  • This paper was presented at the Rail Transportation Division Session RT-3 of the ASME Annual Meeting 20 November 1974.
• Corporate Authors:

  Stucki (A) Company

  Mckees Rocks, PA  United States 
• Authors:
  • Wiebe, D
• Publication Date: 1974

Media Info

• Features: Figures; References;

Subject/Index Terms

• TRT Terms: Damping (Physics); Motor vehicle dynamics; Railcar trucks; Rocking; Rolling; Suspension systems; Trucks; Vehicle design; Vehicle dynamics; Vehicle performance
• Old TRIS Terms: Car design; Dynamic vehicle performance; Rock and roll; Truck behavior
• Subject Areas: Design; Motor Carriers; Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00072669
• Record Type: Publication
• Source Agency: Stucki (A) Company
• Files: TRIS
• Created Date: Jan 9 1976 12:00AM