Laboratory investigation of ability of oil-based friction modifiers to control adhesion at wheel-rail interface

Galas, Radovan; Omasta, Milan; Křupka, Ivan; Hartl, Martin

doi:10.1016/j.wear.2016.09.015

Cited by 30 publications

(30 citation statements)

References 32 publications

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“…It was observed that FMs can cause a low COF, even lower or the same as in the case of flange lubricants. Similar findings were reported for the laboratory investigations where commercial oilbased FMs and a ball-on-disc apparatus were used [10]. Moreover, Lundberg et al [11] reported that too much FM results in an unacceptably low friction coefficient (0.13-0.16), also for water-based FMs.…”

Section: Introductionsupporting

confidence: 78%

“…Beside the noise and corrugation reduction, the effect of FMs on adhesion has been studied in recent years [9][10][11]. Areiza et al [9] measured RESEARCH the coefficient of friction (COF) on the rail using a hand-pushed tribometer when oil-based FMs were manually applied on the top of rail.…”

Section: Introductionmentioning

confidence: 99%

“…An application of FMs seems to be a suitable approach to the reduction of noise, vibrations and corrugation which represent one of the most important problems of railway transportation, especially in urban areas. However, the recently published articles [9][10][11] indicate that oil-based FMs can have a negative impact on traction or braking. With respect to these articles, the aim of this case study is to clarify the hypothesis that oil-based FMs are able to optimize adhesion and reduce noise emitted by the contact without a serious risk of adhesion loss.…”

Section: Introductionmentioning

confidence: 99%

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Case Study: the Influence of Oil-based Friction Modifier Quantity on Tram Braking Distance and Noise

Galas¹,

Omasta²,

Klapka³

et al. 2017

Tribol. Ind.

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In the present study, the twin disc machine and the light rail system was employed in order to investigate the ability of oil-based friction modifier (FM) to optimize adhesion and to reduce noise. The risks associated with poor adhesion conditions after the application of FM were evaluated. Both laboratory and field experiments showed that if the contact is overdosed by FM, the poor adhesion, which results in the extension of braking distance, can occur. In contrast, the smaller quantities do not cause critical adhesion but the effect of FM on the noise reduction is negligible. This study indicates that it can be quite difficult to achieve a reasonable noise reduction without a significant impact on braking distance of tram when the oil-based FM is applied. The field experiments also showed that the carry distance of FM is rather limited, approximately 100 m.

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Section: Introductionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Case Study: the Influence of Oil-based Friction Modifier Quantity on Tram Braking Distance and Noise

Galas¹,

Omasta²,

Klapka³

et al. 2017

Tribol. Ind.

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“…Based on the above-mentioned laboratory experiments [1], TORL-A was chosen as a suitable TOR lubricant for field trials [2] where TOR lubricant was applied using newly developed off-board system. Figure 1b shows the results of braking tests [2] where the effect of applied quantity on the tram braking distance was investigated.…”

Section: Resultsmentioning

confidence: 99%

“…The rail profile and curve radius was 49E1 and 200 m respectively. Figure 1a shows the results of laboratory experiments [1], particularly adhesion (traction) curves for dry and lubricated conditions. Each point on adhesion curve represents the average value of the adhesion coefficient from the time test, which was conducted for various slip values.…”

Section: Methodsmentioning

confidence: 99%

Top-of-Rail Lubricants: Potential Risks and Benefits

2018

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Assessing the Performance of TOR Lubricants in Humid Environments and Under Dew Conditions

Skurka,

Galas,

Omasta

et al. 2024

Tribol Lett

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Top-of-rail (TOR) lubricants are commonly used for friction control in railway operations. They aim to lower friction and reduce noise and wear while ensuring sufficient transmission of traction/braking forces. However, the wheel–rail interface is an open system, so the conditions may suddenly change due to the weather, and different contaminants may enter the contact and influence the performance of these lubricants. Thus, this study examined the effect of humidity and dew on two commercial products, as these conditions often occur on the track. A methodology based on a creep curves measurement approach was used to assess product performance under various scenarios. All measurements were conducted on a universal tribometer in the ball-on-disc configuration covered with a climate chamber. The results show a strong influence of dew on the tested products, as dew lowered their performance parameters and caused low adhesion problems. Possible mechanisms of water–oil interaction and formation of oxidic third body layers were discussed. The main findings indicate that TOR lubricants may cause traction/braking problems if used in dew conditions. The present study may be helpful in optimising friction management methods in the future. Graphical Abstract

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Laboratory investigation of ability of oil-based friction modifiers to control adhesion at wheel-rail interface

Cited by 30 publications

References 32 publications

Case Study: the Influence of Oil-based Friction Modifier Quantity on Tram Braking Distance and Noise

Case Study: the Influence of Oil-based Friction Modifier Quantity on Tram Braking Distance and Noise

Top-of-Rail Lubricants: Potential Risks and Benefits

Assessing the Performance of TOR Lubricants in Humid Environments and Under Dew Conditions

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