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Lemma, Yonas
Publications (3 of 3) Show all publications
Lemma, Y., Asplund, M. & Rantatalo, M. (2015). Investigation of the Top-of-Rail Friction by Field Measurements on Swedish Iron Ore Line (ed.). Paper presented at . International Journal of COMADEM, 18(2), 17-20
Open this publication in new window or tab >>Investigation of the Top-of-Rail Friction by Field Measurements on Swedish Iron Ore Line
2015 (English)In: International Journal of COMADEM, ISSN 1363-7681, Vol. 18, no 2, p. 17-20Article in journal (Refereed) Published
Abstract [en]

Friction management in the railway industry is a well-established technology with the aim of optimizing the friction between the wheel and rail. Determining the friction coefficient (μ) at the wheel-rail interface is therefore important especially for heavy haul lines with higher axle loads. This paper presents an initial study of the top-of-rail friction condition of a line with 30 ton axle load, the Iron Ore Line in the northern part of Sweden. The friction coefficient between the rail and the metal wheel of a portable tribometer was measured at different geographical locations and in different environmental conditions. The effects of precipitation are studied and compared with the effects of top-of-rail friction modifiers.The measurements of non-lubricated line sections showed values of μ≈0.6, compared to μ≈0.3 for areas with, for example, top-of- rail lubrication. In snowy conditions a decrease in friction could also be detected.Keywords: Friction management, Friction measurement, Friction modifier, Heavy haul railway line, Swedish Iron Ore Line.

National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-10008 (URN)8c296ccf-6ced-4d21-a3d3-2c6742fa8f81 (Local ID)8c296ccf-6ced-4d21-a3d3-2c6742fa8f81 (Archive number)8c296ccf-6ced-4d21-a3d3-2c6742fa8f81 (OAI)
Note
Validerad; 2015; Nivå 1; 20150428 (yonlem)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Lemma, Y., Asplund, M., Rantatalo, M. & Lundberg, J. (2014). Top-of-Rail Friction Measurements of the Swedish Iron Ore Line (ed.). In: (Ed.), Uday Kumar; Ramin Karim; Aditya Parida; Philip Tretten (Ed.), Proceedings of the 3rd international workshop and congress on eMaintenance: June 17-18 Luleå, Sweden : eMaintenance, Trends in technologies & methodologies, challenges, possibilites and applications. Paper presented at International Workshop and Congress on eMaintenance : 17/06/2014 - 18/06/2014 (pp. 3-7). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Top-of-Rail Friction Measurements of the Swedish Iron Ore Line
2014 (English)In: Proceedings of the 3rd international workshop and congress on eMaintenance: June 17-18 Luleå, Sweden : eMaintenance, Trends in technologies & methodologies, challenges, possibilites and applications / [ed] Uday Kumar; Ramin Karim; Aditya Parida; Philip Tretten, Luleå: Luleå tekniska universitet, 2014, p. 3-7Conference paper, Published paper (Refereed)
Abstract [en]

Friction management in the railway industry is a well-establishedtechnology with the aim of optimizing the friction between wheeland rail. Determining the friction coefficient (Q) at the wheel-railinterface is therefore important especially for heavy haul lineswith higher axel loads. This paper presents an initial study of thetop-of-rail friction condition of a 30 ton axel load, Iron Ore line inthe northern part of Sweden. The friction coefficient between therail and a metal wheel of a portable Tribometer was measured atdifferent geographical locations and during differentenvironmental conditions. The effects of precipitation are studiedand compared with the effects of top of rail friction modifiers. Themeasurements of not lubricated line sections showed valuesaround Q 0.6 compared to Q 0.3 for areas with e.g. top-of- raillubrication. During snowy conditions a decrease in friction couldalso be detected.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2014
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
urn:nbn:se:ltu:diva-29351 (URN)2cd20f38-0456-4f9d-ad3d-afb508df6d43 (Local ID)978-91-7439-972-1 (ISBN)978-91-7439-973-8 (ISBN)2cd20f38-0456-4f9d-ad3d-afb508df6d43 (Archive number)2cd20f38-0456-4f9d-ad3d-afb508df6d43 (OAI)
Conference
International Workshop and Congress on eMaintenance : 17/06/2014 - 18/06/2014
Note
Godkänd; 2014; 20140619 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Lemma, Y., Famurewa, S. M., Galar, D., Schunnesson, H. & Fjellner, J. (2012). CMMS benchmarking development in mining industries (ed.). In: (Ed.), Ramin Karim; Aditya Parida; Uday Kumar (Ed.), Proceedings of the 2nd International Workshop & Congress on eMaintenance: Dec 12-14 Luleå, Sweden : eMaintenace: trends in technologies and methodologies, challenges, possibilities and applications. Paper presented at International Workshop and Congress on eMaintenance : 12/12/2012 - 14/12/2012 (pp. 211-218). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>CMMS benchmarking development in mining industries
Show others...
2012 (English)In: Proceedings of the 2nd International Workshop & Congress on eMaintenance: Dec 12-14 Luleå, Sweden : eMaintenace: trends in technologies and methodologies, challenges, possibilities and applications / [ed] Ramin Karim; Aditya Parida; Uday Kumar, Luleå: Luleå tekniska universitet, 2012, p. 211-218Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2012
National Category
Other Civil Engineering
Research subject
Operation and Maintenance; Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-37290 (URN)b440f2a3-9827-4f53-a3a1-cdc39c22194d (Local ID)978-91-7439-539-6 (ISBN)b440f2a3-9827-4f53-a3a1-cdc39c22194d (Archive number)b440f2a3-9827-4f53-a3a1-cdc39c22194d (OAI)
Conference
International Workshop and Congress on eMaintenance : 12/12/2012 - 14/12/2012
Note
Godkänd; 2012; 20121214 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-06-25Bibliographically approved
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