An analytical study is described which explores add-on treatments and advanced concepts for the reduction of noise levels in three high-speed aircraft driven by propellers. Noise reductions of 25 to 28 dB are required to achieve a goal of an A-weighted sound level not greater than 80 dB. It is found that only a double-wall system, with a limp inner wall or trim panel, can achieve the required noise reductions. Weight penalties are estimated for the double-wall treatments. These penalties are 0.75 % to 1.51 % of the airplane takeoff weight for the particular baseline designs selected. (Krautzig)


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    Title :

    Noise control prediction for high-speed, propeller-driven aircraft


    Additional title:

    Schalldaempfungsvoraussage fuer Hochgeschwindigkeitspropellerflugzeuge


    Contributors:
    Wilby, J.F. (author) / Rennison, D.C. (author) / Wilby, E.G. (author) / Marsh, A.H. (author)

    Published in:

    Publication date :

    1980


    Size :

    10 Seiten, 17 Bilder, 3 Tabellen, 14 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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