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Study on the braking distance of composite brake blocks covered with ice for freight trains in winter
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0002-1703-6275
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0001-7393-569X
KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics.ORCID iD: 0000-0002-8237-5847
2023 (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. 237, no 8, p. 1050-1059Article in journal (Refereed) Published
Abstract [en]

In winter, some freight trains with composite brake blocks experience unexpected long braking distances, which seriously jeopardizes running safety. The reasons for the long braking distances are still not completely understood, and therefore it is difficult to suggest preventive measures. Up to now, it has not really been studied how a layer of ice that is often found between the brake block and the wheel influences the braking process. To investigate whether ice influences the braking distance, a numerical model is built. Ice thickness, ambient temperature, initial speed, and axle load/brake pressure are parameters that can be varied in the model. Results are checked against available on-track tests. The simulation results show that ice significantly influences the braking distance. The impact of ice on the braking distance increases when the ambient temperature, initial speed, and brake pressure are low, which is consistent with available field test reports. The results also show that a conditioning brake, a high brake pressure and a small clearance between the wheel and brake block can efficiently reduce the impact of ice on the braking distance of freight trains with composite brake blocks in winter.

Place, publisher, year, edition, pages
SAGE Publications , 2023. Vol. 237, no 8, p. 1050-1059
Keywords [en]
braking distance, composite brake block, Freight train, ice, winter
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-338418DOI: 10.1177/09544097231151474ISI: 000913437000001Scopus ID: 2-s2.0-85146537403OAI: oai:DiVA.org:kth-338418DiVA, id: diva2:1806637
Note

QC 20231023

Available from: 2023-10-23 Created: 2023-10-23 Last updated: 2023-10-23Bibliographically approved

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Zhang, YanjunLiu, ZhendongStichel, Sebastian

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Zhang, YanjunLiu, ZhendongStichel, Sebastian
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Vehicle Engineering and Solid MechanicsThe KTH Railway Group
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Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit
Vehicle Engineering

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