An analysis is made of the 'interior noise' produced by high, subsonic turbulent flow over a thin elastic plate partitioned into 'panels' by straight edges transverse to the mean flow direction. This configuration models a section of an aircraft fuselage that may be regarded as locally flat. The analytical problem can be solved in closed form to represent the acoustic radiation in terms of prescribed turbulent boundary layer pressure fluctuations. Two cases are considered: (i) the production of sound at an isolated panel edge (i.e., in the approximation in which the correlation between sound and vibrations generated by neighboring edges is neglected), and (ii) the sound generated by a periodic arrangement of identical panels. The latter problem is amenable to exact analytical treatment provided the panel edge conditions are the same for all panels. Detailed predictions of the interior noise depend on the knowledge of the turbulent boundary layer wall pressure spectrum, and are given here in terms of an empirical spectrum proposed by Laganelli and Wolfe. It is expected that these analytical representations of the sound generated by simplified models of fluid-structure interactions can used to validate more general numerical schemes.


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    Title :

    Influence of mean flow on boundary layer generated interior noise


    Additional title:

    Strömungseinflüsse auf grenzschichtverursachten Flugkabineninnenlärm


    Contributors:
    Howe, M.S. (author) / Shah, P.L. (author)

    Published in:

    Publication date :

    1996


    Size :

    11 Seiten, 8 Bilder, 29 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English