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Pin-on-disc study of the effects of railway friction modifiers on airborne wear particles from wheel-rail contact
KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement. (KTH railway group)
KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement. (KTH railway group)ORCID-id: 0000-0003-2489-0688
KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
KTH, Skolan för industriell teknik och management (ITM), Maskinkonstruktion (Inst.), Maskinelement.
2013 (Engelska)Ingår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 60, s. 136-139Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Knowledge of wheel–rail interaction is crucial to wheel and rail maintenance. In this interaction, some of theworn-off material is transformed into airborne particles. Although such wear is well understood, few studiestreat the particles generated. We investigated friction modifiers' effects on airborne particles characteristicsgenerated in wheel-rail contacts in laboratory conditions. Pin-on-disc machine testing with a round-head pinloaded by a dead weight load 40 N simulated maximum contact pressure over 550 MPa. Airborne particlecharacteristics were investigated in dry contacts and in ones lubricated with biodegradable rail grease andwater- and oil-based friction modifiers. The number of particles declined with the grease; the number ofultrafine particles increased with the water-based friction modifier, mainly due to water vaporization.

Ort, förlag, år, upplaga, sidor
Elsevier, 2013. Vol. 60, s. 136-139
Nyckelord [en]
Airborne particles, Lubricant, Railway, Wear
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning) Annan naturresursteknik Nanoteknik
Forskningsämne
Järnvägsgruppen - Effektiva tågsystem för godstrafik; Järnvägsgruppen - Tribologi
Identifikatorer
URN: urn:nbn:se:kth:diva-104664DOI: 10.1016/j.triboint.2012.11.013ISI: 000315550700019Scopus ID: 2-s2.0-84870703141OAI: oai:DiVA.org:kth-104664DiVA, id: diva2:566215
Projekt
F6521
Anmärkning

QC 20121128

Tillgänglig från: 2012-12-07 Skapad: 2012-11-08 Senast uppdaterad: 2018-01-12Bibliografiskt granskad
Ingår i avhandling
1. Towards elimination of airborne particles from rail traffic
Öppna denna publikation i ny flik eller fönster >>Towards elimination of airborne particles from rail traffic
2013 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Since the investigation of wear particles from rail transport started in the late 1910s, the high mass concentrations of these particles have prompted concern among researchers interested in air quality. However, effective action has yet to be taken because relevant knowledge is still missing. This thesis provides knowledge of airborne wear particles originating from rail transport. Some aspects of their characteristic parameters, such as size, mass concentration, number concentration, and morphology, were investigated in the field and in laboratory tests. We also discuss means to mitigate non-exhaust emissions, as well as the advantages and disadvantages of various test set-ups in the seven appended journal papers:Paper A reviews recent studies of exhaust and non-exhaust emissions from rail vehicles. The results, measurements, adverse health effects, and proposed or applied solutions presented in this literature are summarized in this paper.Paper B summarizes the results of field tests we conducted. The effects of curve negotiation and braking under different real conditions were investigated in a field test in which on-board measurements were made. The elemental composition and morphology of the particles emitted and their potential sources were also investigated.Paper C describes how a pin-on-disc machine can be used to reproduce real operating conditions during mechanical train braking in a controlled laboratory setting. The results were validated by comparing the field test results with the results of laboratory studies.Paper D presents comprehensive results of laboratory studies of airborne particles from different braking materials. A new index is introduced in this paper, which can be used as a quantitative metric for assessing airborne wear particle emission rates.Paper E describes the effects of using various friction modifiers and lubricants on the characteristics of airborne particles from wheel–rail contact under lubricated and unlubricated conditions.Paper F reports work to simulate thermoelastic instability in the cast-iron braking material. We simulated the fluctuation of the flash temperature by considering the temperature dependency of the material properties and the transformation of the contact state due to thermomechanical phenomena and wear.Paper G reviews new full- and sub-scale measurements of non-exhaust emissions from ground transport. The advantages and disadvantages of on-board measurements, pin-on-disc tests, dynamometer tests, and test rig studies are discussed in this paper.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2013. s. 37
Serie
Trita-MMK, ISSN 1400-1179 ; 2013:11
Nyckelord
Airborne, brake block, brake pad, railway, subway, TEI, wheel–rail, wear
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Järnvägsgruppen - Tribologi
Identifikatorer
urn:nbn:se:kth:diva-131372 (URN)978-91-7501-881-2 (ISBN)
Disputation
2013-11-22, F3, Lindstedtsvägen 26, KTH Royal Institute of Technology, Stockholm, 14:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20131025

Tillgänglig från: 2013-10-25 Skapad: 2013-10-14 Senast uppdaterad: 2018-01-11Bibliografiskt granskad

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Olofsson, Ulf

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