An active noise control model for reducing aircraft interior noise has been evaluated. The structural noise transmission properties of an aircraft fuselage were modeled as a flexible cylinder excited by external acoustic dipoles simulating, the noise produced by twin propellers. The amplitudes of an internal distribution of monopole control source were determined such that the area-weighted, mean-square acoustic pressure was minimized in the propeller plane. The noise control model was evaluated at low frequencies corresponding to the blade passage frequency and the first few harmonics of a typical turboprop aircraft. Interior noise reductions up to 20 dB were achieved over a substantial region of the cylindrical cross section, with just a few monopole control sources.


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    Title :

    Active control of propeller-induced noise fields inside a flexible cylinder


    Additional title:

    Aktive Geräuschkontrolle von propellerinduzierten Schallfeldern im Innern eines flexiblen Zylinders


    Contributors:
    Lester, H.C. (author) / Fuller, C.R. (author)

    Published in:

    AIAA Journal ; 28 , 8 ; 1374-1380


    Publication date :

    1990


    Size :

    7 Seiten, 7 Bilder, 2 Tabellen, 10 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English








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