Field measurements of noise were made near a railrod retarder system without barriers and with acoustical barriers of various configurations. The configurations tested included acoustically reflective and acoustically absorptive barriers with heights of 4 to 12 feet and lengths extending from 0 to 22 feet beyond retarder entrance and exit. Two of the 12 foot high barriers were also tested with a 1 foot inward projecting acoustical panel lip along the top. It was found that the absorptive barriers reduced retarder noise from a few decibels inside the barriers to as much as 25 decibels, at 100 feet from the retarder on the system centerline perpendicular to the tracks. Reflective barriers increased noise inside the barriers and at points outside, but near open ends of, the barriers, and reflective barrier noise reduction at 100 feet on the perpendicular centerline was limited to about 16 decibels. Retarder noise was concentrated in a frequency range between 2 and 3 kilohertz. The analytical study presented provides details on the role of observer location as well as the various aspects of barrier configuration. (Jensen)


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    Title :

    Railroad retarder noise reduction: Study of acoustical barrier configurations


    Additional title:

    Schalldaemmung bei der Eisenbahn: Untersuchung von Schallschutzwaenden


    Contributors:
    Morgan, J.A. (author) / Ingard, U. (author)

    Published in:

    Publication date :

    1979


    Size :

    93 Seiten


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English




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