Under-sleeper pads are primarily used to improve the structure of ballasted track, helping to maintain an even surface, improve the grip between ballast and concrete sleepers and avoid the development of hollow areas underneath the sleepers. However, ongoing research suggests that these pads can also offer an economical way to mitigate problems of structure-borne noise and vibration. As well as reducing noise and vibration by providing a smoother trackbed, the highly elastic materials can also reduce emissions significantly thanks to their physical insulation properties. In the relevant range for emitted structure-borne noise and secondary airborne noise, above 50 Hz the insulation efficiency varies between 4 dB and 14 dB at 63 Hz across all types of pad. Under-sleeper pads that are predominantly used to improve trackbed geometry ideally consist of a resistant material with a visco-plastic property. This allows the ballast stones to become properly embedded, even if the pads are very stiff. On the other hand, pads used primarily for vibration insulation require a softer, dynamically highly-elastic material with low damping properties. Our research suggests that appropriate under-sleeper pads can be used to reduce vibration within the frequency range relevant to structure-borne noise by more than 10 dB. Nevertheless, we have not established any significant impact on primary airborne noise. Technically-optimised pads offer an economic improvement for vibration protection in traditional track structures, but the choice of material is of vital importance.


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    Titel :

    Mitigating vibration using under-sleeper pads


    Beteiligte:
    Loy, Harald (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2012


    Format / Umfang :

    3 Seiten, 6 Bilder, 6 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch