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Enhancement of the Computation of Common Normal Between Wheel and Rail Surface

[+] Author Affiliations
Behrooz Fallahi, Sunil K. Ballamudi

Northern Illinois University, DeKalb, IL

Paper No. IMECE2013-65216, pp. V013T14A046; 7 pages
doi:10.1115/IMECE2013-65216
From:
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 13: Transportation Systems
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5642-0
  • Copyright © 2013 by ASME

abstract

Simulations are playing an important role to predict derailment, switching, wheel climbing and curving in the study of dynamics of railroad vehicles. For a successful simulation, a robust and efficient approach for computation of all common normal between wheel and rail surface is needed. In a previous work, the authors had devised an approach based on sign distant function to compute all common normal between a pair of wheel and surface. As part of this approach, two major computational tasks were formulated. They were computation of cauchy index around a cell (a closed curve) and computation of the zero’s of the gradient of the signed distance function. In this study, a bookkeeping technique is devised to compute the cauchy index more efficiently. Also the performance of trust region method as a solver for a set of nonlinear equation is compared to Newton’s method.

Copyright © 2013 by ASME
Topics: Computation , Rails , Wheels

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