Publication detail
Influence of climatic conditions on adhesion in the wheel-rail contact
GALAS, R. OMASTA, M. KŘUPKA, I. HARTL, M.
Czech title
Vliv klimatických podmínek na adhezi mezi kolem a kolejnicí
English title
Influence of climatic conditions on adhesion in the wheel-rail contact
Type
conference paper
Language
en
Original abstract
The goal of this study was to investigate the effect of climatic conditions on adhesion in the wheel-rail contact. For this purpose, a ball-on-disc tribometer was utilized which enables to precisely control climatic conditions, mainly temperature and air humidity. Apart from these conditions, the influence of leaf layer on adhesion was investigated. The special attention was paid to water condensation which can cause a further adhesion decrease. Obtained results showed that a combination of high relative humidity and a presence of leaf layer can significantly reduce adhesion in the contact, even below a value 0.1 which is needed to traction and braking.
Czech abstract
Cílem práce je popsat vliv klimatických podmínek na adhezi v kontaktu kola a kolejnice. Experimenty byly provedeny na tribometru v konfiguraci ball-on-disc, který umožňuje simulaci různých klimatických podmínek. V rámci této studie byl zkoumán vliv teploty a vlhkosti vzduchu na adhezi. Současně byla část experimentů provedena s diskem na kterém byla předem připravena tenká vrstva z listí a listového extraktu. Výsledky studie ukázaly, že kombinace vysoké relativní vlhkosti a přítomnosti listí může vést k redukci adheze až pod hodnotu 0,1, která je nezbytná pro bezpečnou trakci a brzdění vozidel.
English abstract
The goal of this study was to investigate the effect of climatic conditions on adhesion in the wheel-rail contact. For this purpose, a ball-on-disc tribometer was utilized which enables to precisely control climatic conditions, mainly temperature and air humidity. Apart from these conditions, the influence of leaf layer on adhesion was investigated. The special attention was paid to water condensation which can cause a further adhesion decrease. Obtained results showed that a combination of high relative humidity and a presence of leaf layer can significantly reduce adhesion in the contact, even below a value 0.1 which is needed to traction and braking.
Keywords in Czech
Adheze; kontakt kola a kolejnice; vlhkost
Keywords in English
Adhesion; wheel-rail contact; humidity
Released
17.09.2018
Publisher
Malaysian Tribology Society
Location
Malajsie
ISBN
978-967-13625-2-5
Book
Proceedings of Asia International Conference on Tribology 2018
Pages from–to
242–243
Pages count
2
BIBTEX
@inproceedings{BUT170146,
author="Radovan {Galas} and Milan {Omasta} and Ivan {Křupka} and Martin {Hartl},
title="Influence of climatic conditions on adhesion in the wheel-rail contact",
booktitle="Proceedings of Asia International Conference on Tribology 2018",
year="2018",
month="September",
pages="242--243",
publisher="Malaysian Tribology Society",
address="Malajsie",
isbn="978-967-13625-2-5"
}