Train detection, for signalling purposes, is often by means of track circuits. Contamination on the track may cause inhibiting train identification. Friction modifiers are of significant current interest in wheel/rail research. Introducing a new material into the tread/top of rail interface can raise questions about the impact on signalling systems. Although no significant effects have been observed in practical operation on a range of railway systems, the intention in this work was to evaluate conductance between wheel and rail in a more controlled and systematic way using the previously established methodology. Using the twin disc technique, friction modifier, in the form of a solid stick, was applied using a spring loaded device to the rotating wheel disc to generate a visible film. Tests were run to measure contact impedance at typical loads and slips. Static tests were also carried out using discs pre-conditioned with a friction modifier film. The electrical circuit used was a modified simplified simulation of audio frequency track circuit. No significant difference was observed in the measured impedance for dry conditions with no friction modifier, versus tests where friction modifier was applied, regardless of percentage slip or input voltage. The analysis suggests that the introduction of friction modifier into the existing wheel/rail interfacial film does not result in increased impedance with all other factors being equal.


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    Title :

    Effect of friction modifiers on wheel/rail isolation


    Contributors:
    Lewis, R. (author) / Gallardo, E.A. (author) / Cotter, J. (author) / Eadie, D.T. (author)


    Publication date :

    2008


    Size :

    9 Seiten, 18 Bilder, 1 Tabelle, 9 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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