The application of active noise reduction systems to reduce locomotive cabin noise presents a challenge for commercial suppliers because the regulatory value of an installation can be considerably less than either the physiological or psychological value. Federal regulations routinely rely on spectral weighting that de-emphasizes the intense low frequency tonal noise present in locomotive cabs and, for which, traditional perceptive weighting was not intended. A spectral comparison of the sound recorded at the ear location of an engineer in medium freight, heavy freight, and high-speed passenger locomotive cabs are presented. A case study of the installation of active noise reduction in a representative cab is also presented to focus on the lack of correlation between regulatory and non-regulatory impact. It is shown that the value of such an installation can exceed that of the regulatory measurement and that the additional factors of comfort, health, and safety should be considered when considering locomotive cabin active noise reduction. Regulated noise measurements are intended to assess the impact of a particular noise on health and safety. Federal regulations of locomotive noise worldwide rely on a frequency weighting that was established to normalize perception, not health or safety impact. Recent investigations of the physiological and psychological impact of low frequency noise suggest that not only would someone interested in assessing health and safety impacts of low frequency dominant environments not choose the A-weighting scale, the would be well served to seek out some inverse of the A-weighting scale. Active noise reduction systems can have provide significant reduction of the interior noise in the low frequency and tonal dominant environment of a locomotive cab. While poorly forged federal regulations continue to devalue the impact, the general acceptance of ANR (Active Noise Reduction) systems will be slowed.


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    Titel :

    The psychological, physiological, and regulatory value of commercial active noise reduction in locomotive cabs


    Weitere Titelangaben:

    Der psychologische, physiologische und Vorschriftwert der kommerziellen, aktiven Geräuschminderung in Lokomotivkabinen


    Beteiligte:


    Erscheinungsdatum :

    2009


    Format / Umfang :

    9 Seiten, 8 Bilder, 1 Tabelle, 19 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch






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