The Army needs helicopter noise source emission data for use in the Installation Compatible Use Zone (ICUZ) program and for environmental assessments. This research gathered noise source emission data for the OH-58D helicopter. The data were normalized to 250 ft for use in noise maps. The data were also used to develop sound exposure level (SEL) versus distance curves for comparison with other helicopter data. The data show that the A-weighted maximum noise level increases with airspeed for level flight, but the A weighted SEL increases only slightly. The highest A-weighted maximum level was produced by the out-of-ground effect hover. Landings produce the largest A-weighted SEL.


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    Title :

    Operational Noise Data for OH-58D Army Helicopters


    Contributors:
    L. J. Benson (author) / M. J. White (author) / K. J. Murphy (author)

    Publication date :

    1992


    Size :

    57 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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