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The influence of snow on the tread braking performance of a train: A pin-on-disc simulation performed in a climate chamber
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).ORCID iD: 0000-0003-2489-0688
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2016 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 230, no 6, 1521-1530 p.Article in journal (Refereed) Published
Abstract [en]

In trains with tread brakes, the coefficient of friction between the brake block and the railway wheel determines the stopping distance. The blocks have traditionally been manufactured from cast iron. Although these blocks have good braking capacity, their use is often restricted due to the squealing noise they emit. Tests of alternative composite block materials have been successful under summer conditions; however, in regions with snowy winters the use of such materials has been limited due to problems with braking capacity under snowy conditions. This research aims to develop a laboratory-scale test methodology for evaluating the braking capacity of tread brake materials under winter and snowy conditions. A pin-on-disc machine placed in a climate chamber was used for testing, and a block of standard cast iron was compared with blocks of standard composite materials. The results indicated that the blocks of standard composite materials generate a much smoother surface on the counter wheel and a significantly lower friction coefficient under snowy conditions. A second test series evaluated blocks of alternative composite materials, and a candidate material with low noise and a sufficiently high sliding friction coefficient was selected for further study. A third test series examining geometrical changes in the contact surface in terms of milled parallel tracks was performed; it revealed that the braking capacity under winter conditions can be increased by milling actions if the parallel tracks are properly oriented - in this case, at an angle of 45 degrees to the sliding direction.

Place, publisher, year, edition, pages
Sage Publications, 2016. Vol. 230, no 6, 1521-1530 p.
Keyword [en]
Friction, snow, tread brakes
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-192745DOI: 10.1177/0954409715616425ISI: 000380946300004Scopus ID: 2-s2.0-84979536736OAI: oai:DiVA.org:kth-192745DiVA: diva2:974468
Note

QC 20160926

Available from: 2016-09-26 Created: 2016-09-20 Last updated: 2017-11-21Bibliographically approved

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  • apa
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