Integrated Dynamic Modeling of Rail Vehicles and Infrastructure: Wheel Climb at a Large Angle of Attack

There are two common derailment scenarios which have been investigated in the railroad vehicle dynamics literature: flange wheel climb and wheel lift. Flange climb derailments are more frequent and can occur at low velocity. It is believed that the flange wheel climb, which is often associated with a large angle of attack (AOA), is the result of a tangential force that produces a contact force that acts upward at the wheel/rail contact point. The wheel lift, on the other hand, can be the result of hunting-produced high lateral velocity and large impact forces that can cause derailments. In this derailment scenario, the tangential force at one wheel can be downward as the result of the wheel life at the other wheel. This project is concerned with flange wheel climb derailments that occur at a large wheelset angle of attack. A fully nonlinear unconstrained multibody system (MBS) wheel climb derailment model is developed to analyze the forces that govern the wheel climb motion when oriented at a large scale AOA. The results of the MBS model in the vicinity of the climb initiation are verified using a semi-analytical model that makes use of simplifying assumptions derived from the current interpretation of wheel climb.

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  • Supplemental Notes:
    • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program. This final report for NURail project NURail2012-UIC-R05 consists of two distinct documents, "Integrated Dynamic Modeling of Rail Vehicles and Infrastructure: Modeling Switch Geometry" and "Integrated Dynamic Modeling of Rail Vehicles and Infrastructure: Wheel Climb at a Large Angle of Attack."
  • Corporate Authors:

    National University Rail Center (NURail)

    University of Illinois at Urbana-Champaign
    Department of Civil and Environmental Engineering, 205 N. Mathews Avenue
    Urbana, IL  United States  61801

    Research and Innovative Technology Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Shabana, Ahmed A
    • O'Shea, James J
  • Publication Date: 2015-8-28


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Pagination: 6p

Subject/Index Terms

Filing Info

  • Accession Number: 01599262
  • Record Type: Publication
  • Report/Paper Numbers: NURail2012-UIC-R05-B
  • Contract Numbers: DTRT12-G-UTC18
  • Created Date: Apr 27 2016 10:19AM