The effect of friction modifiers on wheel/rail isolation

Lewis, Roger; Gallardo, E.A.; Cotter, John; Eadie, Donald T.

doi:10.1016/j.wear.2010.10.036

Cited by 13 publications

(16 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3–8 There are also reductions in low-frequency vibrations 8 (which leads to reduced corrugations and improved ride comfort) and reduced fuel consumption 9 (via reduced rolling and curve resistance). Additionally, there is no impact of FMs on track isolation circuits 10 or braking capabilities, which are important safety aspects of any product to be applied to the rail.…”

Section: Introductionmentioning

confidence: 99%

A comparison of friction modifier performance using two laboratory test scales

Buckley-Johnstone

Harmon

Lewis

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

A comparison of friction modifier performance using two laboratory test scales

Buckley-Johnstone

Harmon

Lewis

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

show abstract

“…Experimental work has been carried out to investigate the effects of sand and leaves 1,2 as well as high positive friction (HPF) friction modifiers at high axle loads. 3 Modelling of the third-body effects has also been carried out. 4 Studies have shown that loss of shunt is more common with light axle loads where films can create a high resistance to, or even destroy, the electrical path between the rail and wheel.…”

Section: Track Circuitsmentioning

confidence: 99%

“…In the case of KELTRACK Õ and Kelsan Õ HPF, the coefficient of friction has been measured on the rail head to be 0.35 using a Salient Systems push tribometer. 3,9 Friction modifiers are being increasingly used on rail networks for the mitigation of curve squeal, increased fuel economy, reduction of lateral forces, reduction in wear, rolling contact fatigue and corrugations. Research shows that the benefits friction modifiers bring can be achieved without detrimental effects to traction or braking.…”

Section: Friction Modifiersmentioning

confidence: 99%

“…This leaves a thin film of the dry friction modifier. 3 The aim of this work was to establish the effects of HPF application on isolation when applied to a twindisc test machine with contact loads simulating the lowest axle loads run by light rail network operators. Studies have shown that loss of shunt is more common with light axle loads and these loads are much lower than used in previous testing.…”

Section: Friction Modifiersmentioning

confidence: 99%

See 1 more Smart Citation

The effect of friction modifiers on wheel/rail isolation at low axle loads

Hardwick

Lewis

2013

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

Signalling block occupancy is triggered by the wheelset of a rail vehicle ‘shunting’ the track circuit. The main cause of loss of shunting is the many materials that can be present on the rail head. These include iron oxides, leaves, ballast dust, oil, as well as products deliberately applied to the rail/wheel such as grease, friction modifiers, lubricants and sand. These may lead to an indication that a signal block is unoccupied when a train is actually present. Friction modifiers (FMs) are being increasingly used for reduction of noise, lateral forces, wear, rolling contact fatigue, etc. The Kelsan® high positive friction (HPF) solid stick FM is applied directly to the wheel tread creating a thin film. Although no effects have been observed during field operation, the intention in this work was to build on previous studies and evaluate conductance across a wider range of contact conditions as studies have shown that loss of shunt is more common with light axle loads where films could have a greater effect. The testing was performed at a contact pressure of 470 MPa (equating to a 4.9 tonne axle load). An HPF stick was spring loaded against the rotating wheel disc to generate a FM film at the contact. Tests were run to measure the impedance across the discs using a modified TI21 track circuit. Static testing was also performed using discs with a pre-generated HPF film. Analysis of the results showed that the application of HPF friction modifier had no significant effect on the measured level of impedance. The highest impedance levels were recorded under pure rolling (0% slip) where FMs were not being applied. In cases where the application of FM increased impedance, the recorded impedance values were still lower than the highest values measured in the absence of a FM. This is of key relevance as several light rail operators coast their trains.

show abstract

“…10 Furthermore, many methods of improving adhesion coefficient have been reported and discussed. [11][12][13][14] Sanding has been a common practice to increase the adhesion coefficient of wheel/rail under the oil and water conditions. 13 Arias-Cuevas et al 14 investigated the influence of the particle size and slip during sanding on the adhesion behavior.…”

Section: Introductionmentioning

confidence: 99%

Investigation on adhesion characteristic of wheel/rail under the magnetic field condition

Wang

Liu

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

The aim of this study is to explore the influence of magnetic field and surface roughness on the adhesion coefficient of wheel/rail using a JD-1 wheel/rail simulation facility. The results indicate that the magnetic field has a significant influence on the adhesion coefficient under the water and oil conditions by means of magnetic force on the wheel/rail contact zone. The use of magnetic field is beneficial to increase the adhesion coefficient of wheel/rail interface. The speed has no visible effect on adhesion coefficient under the magnetic field condition. Increasing surface roughness improves the adhesion level of wheel/rail interface under the water and oil conditions.

show abstract

The effect of friction modifiers on wheel/rail isolation

Cited by 13 publications

References 7 publications

A comparison of friction modifier performance using two laboratory test scales

A comparison of friction modifier performance using two laboratory test scales

The effect of friction modifiers on wheel/rail isolation at low axle loads

Investigation on adhesion characteristic of wheel/rail under the magnetic field condition

Contact Info

Product

Resources

About