The objectives of this study were to develop sound exposure level (SEL) versus distance curves for the UH -60A and CH-47C Army helicopters, to investigate the variation of SEL with aircraft speed, and to confirm the validity of the measurement procedures by comparing data obtained for UH-1H helicopters at Forts Campbell and Rucker. Sound levels produced by the helicopters were measured for heavily and lightly loaded aircraft which were hovering and traveling at various speeds and distances. The data show that a heavily loaded UH-60A is about 2 dB louder than a lightly loaded one. Landing noise with the UH-60A and CH-47 is substantially greater than for level flyover. The variation of SEL with speed is rather modest, except for aircraft at very low or very high speeds. The results for the UH-1H at Forts Campbell and Rucker did not compare as favorably as expected. Various factors, including maintenance procedures and the surface of the test area, may have contributed to the discrepancies. (Author)


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    Title :

    Operational Noise Data for UH-60A and CH-47C Army Helicopters


    Contributors:
    P. D. Schomer (author) / A. Averbuch (author) / R. Raspet (author)

    Publication date :

    1982


    Size :

    46 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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