Temperatures at Railway Tread Braking. Part 1: Modelling

A thermal model of railway tread braking is developed for use in routine calculations of wheel and brake block temperatures. Two-dimensional finite-element models of block(s) and wheel are coupled via a contact interface that controls heat generation, as well as the heat partitioning between block and wheel through thermal contact resistance. The surface temperature variations around the wheel circumference, as caused by frictional heating and intermediate cooling, are accounted for by assuming high-speed sliding conditions. The thermal power generated at the block-wheel interface during braking is determined from train braking data. A model for heat transfer from the rolling wheel into the rail is developed from a film having thermal contact resistance that is placed at the wheel-rail contact interface. The author notes that the present model can be used to design efficient tread braking systems for both freight and passenger trains. Moreover, the model can handle stop braking and drag braking, both at constant brake power and during intermediate cooling periods. As the temperature history during a full train route can be calculated, the inclusion of heat transfer from wheel to rail denotes the usefulness of the model for comparing brake rig tests—where the chilling influence from the rail is normally not included—with in-field tests. The numerical modeling found in this research is supplemented by the inclusion of two companion papers containing experimental results. Also included is a brief numerical example that demonstrates both heat partitioning and the influence of rail chill (at approximately 30 %) for two braking configurations.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09544097
• Authors:
  • Vernersson, T
• Publication Date: 2007-6

Language

• English

Media Info

• Media Type: Print
• Features: Appendices; Figures; Illustrations; References;
• Pagination: pp 167-182
• Serial:
  • Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit
  • Volume: 221
  • Issue Number: 2
  • Publisher: Sage Publications Limited
  • ISSN: 0954-4097
  • EISSN: 2041-3017
  • Serial URL: http://pif.sagepub.com/content/current

Subject/Index Terms

• TRT Terms: Braking; Braking performance; Computer models; Finite element method; Heat transfer; High speed rail; High speed track; Mathematical models; Numerical analysis; Railroad tracks; Railroad wheelsets; Rolling contact; Rolling friction; Surface temperature; Testing; Thermal properties
• Subject Areas: Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 01076512
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 21 2007 1:54PM