Noise-reduction measurements are presented for a stiffened and an unstiffened model of an airplane fuselage. The cylindrical models were tested in a reverberant-field noise environment over a frequency range from 20 Hz to 6 kHz. An unstiffened metal fuselage provided more noise reduction than a fuselage having the same sidewall weight divided between skin and stiffening stringers and ring frames. The addition of acoustic insulation to the models tended to smooth out the interior-noise spectrum by reducing or masking the noise associated with the structural response at some of the resonant frequencies.


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    Title :

    Noise-Reduction Measurements of Stiffened and Unstiffened Cylindrical Models of an Airplane Fuselage


    Contributors:
    C. M. Willis (author) / W. H. Mayes (author)

    Publication date :

    1984


    Size :

    28 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English