An innovative concept of 'Localized Active Noise Control' is experimentally demonstrated in achieving a satisfactory cabin noise reduction for propeller aircraft. The principle of localized active noise control is to reduce the propeller noise (primary source) only locally in the vicinity of an antiphase sound source (secondary source) which is mounted on the wall of an aircraft cabin. Then, several such sound sources mounted on the cabin wall can reduce the propeller noise over a large area on the cabin surface and behind it. This has been demonstrated by conducting a laboratory experiment in which an acoustic driver generating discrete frequency sound behind a thin metallic surface was used as the primary source. Four other acoustic drivers mounted on the surface were used to generate the antiphase sound on the other side of the surface. The measured noise field behind the metallic surface indicates satisfactory noise reduction. The present experimental arrangement works particularly well at low frequencies but more secondary sources will be required for high frequency noise. Another potential application of this technique, demonstrated in this paper, is to reduce noise levels in selected areas on the exterior of the aircraft where sonic fatigue may be critical.


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    Title :

    Application of localized active noise control to reduce propeller noise transmitted through fuselage surface


    Additional title:

    Aktive oertliche Laermminderung zur Daempfung des ueber das Leitwerk uebertragenen Propellergeraeusches


    Contributors:

    Published in:

    AIAA-Papers ; Jan ; 1-9


    Publication date :

    1988


    Size :

    9 Seiten, 16 Bilder, 8 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English