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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 110
PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Paper 323

The Evaluation of the Braking Process for a Rail Vehicle on the Basis of the Temperature Distribution of the Brake Disc

W. Sawczuk

Faculty of Working Machines and Transportation, Division of Rail Vehicles, Poznan University of Technology, Poland

Full Bibliographic Reference for this paper
W. Sawczuk, "The Evaluation of the Braking Process for a Rail Vehicle on the Basis of the Temperature Distribution of the Brake Disc", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 323, 2016. doi:10.4203/ccp.110.323
Keywords: hot spots, temperature of brake disc, coefficient of friction.

Summary
In rail vehicles, as a result of the ever-increasing speed, a disc brake is used as a friction brake which gradually displaces the brake-blocks. In public transport vehicles, the electrical traction units or subway; the disc brake collaborates with an electrodynamic brake that limits the use of the friction brake with a simultaneous possibility of power return due to the generator character of the traction engine. Prior to the release of a brake for testing, the tests are carried out on the brake positions, where one of the measurements is of the disc temperature by the use of thermocouples. The decrease of the friction coefficient during braking from high speeds (above 160 km/h) may be affected by both the thermal processes and the phenomenon of a "third" layer in contact with the disc pads prepared from the wear friction pair products. The longer braking times form an additional layer due to the difficulty in the discharge of the waste friction material at the junction of the disc and the pad. This layer increases the pad slip relative to the brake disc. This paper presents the use of a thermal imaging camera while testing the disc brake friction pair elements in the breaking process evaluation.

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