Rolling noise is the dominant contribution to the overall noise emission from conventional rail traffic. It is caused by the roughness of the surfaces of wheel and rail and is radiated by both the rail and the wheels with the radiation from the rail dominating in the frequency range below 1000 Hz and the radiation from the wheels dominating above 1500 Hz. This implies that special attention has to be paid to the noise emission from the rail when discussing noise reduction measures at the source for railway lines in urban areas where the speeds are typically < 120 km/h. SILENCE is an integrated project funded by the EU within the sixth frame work program. It focuses on noise reduction in urban areas. One work package within SILENCE aims at reducing the noise emission by increasing the damping of the rail. The target is twofold. First increased damping shall reduce the direct noise emission of the rail by modifying the vibration behaviour of the rail and second indirectly by reducing the roughness growth rate. In this paper we will introduce an optimized rail damping system and the results of a field test focussing on the achieved direct noise mitigation. A noise reduction up to 4 dB(A) due to the increased damping of the rail was measured on the test track. The mitigation potential of the dampers is dependent on the rail fastening system: It is larger for softer rail pads because the contribution of the rail to the overall noise is higher than for stiffer pads. By variation of the tuning frequency (mainly by changing the size and spacing of the steel elements, or the stiffness of the elastomer of the damper) the dampers can be optimized with respect to the speed of the trains. Future work will aim at broadening the frequency range of a damper, in such a way as to combine the anti roughness growth dynamic characteristics with decay rate reduction in an optimal manner. This will be done by an integrated approach of development, computer simulation and validation measurements. Within SILENCE a field test will be carried out to measure the combined effect of damped freight wheel on a damped rail.


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    Titel :

    Reducing the noise emission by increasing the damping of the rail: Results of a field test


    Beteiligte:
    Asmussen, B. (Autor:in) / Stiebel, D. (Autor:in) / Kitson, P. (Autor:in) / Farrington, D. (Autor:in) / Benton, D. (Autor:in)


    Erscheinungsdatum :

    2008


    Format / Umfang :

    7 Seiten, 5 Bilder, 2 Tabellen, 3 Quellen





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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