The transmission of external jet noise through the double-leaf skin plate of an aircraft cabin fuselage in the presence of external mean flow is analytically studied. An aeroacoustic-elastic theoretical model is developed and applied to calculate the sound transmission loss versus frequency curves. Four different types, of acoustic phenomenon (i.e., the mass-air-mass resonance, the standing-wave attenuation, the standing-wave resonance, and the coincidence resonance) for a flat double-leaf plate as well as the ring frequency resonance for a curved double-leaf plate are identified. Independently of the proposed theoretical model, simple closed-form formulas for the natural frequencies associated with the preceding acoustic phenomena are derived using physical principles. Excellent agreement between the model predictions and the closed-form formulas is achieved. Systematical parametric investigation with the model demonstrate that the presence of the mean flow as well as the sound incidence angles substantially affect the sound transmission behavior of the double-leaf structure. The influences of the panel curvature together with cabin internal pressure onjet noise transmission are also significant and should be taken into account when designing aircraft cabin fuselages.


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    Title :

    External mean flow influence on noise transmission through double-leaf aeroelastic plates


    Additional title:

    Einfluss der mittleren externen Strömung auf die Lärmübertragung durch zweischalige aeroelastische Platten


    Contributors:
    Xin, F.X. (author) / Lu, T.J. (author) / Chen, C.Q. (author)

    Published in:

    AIAA Journal ; 47 , 8 ; 1939-1951


    Publication date :

    2009


    Size :

    13 Seiten, 10 Bilder, 1 Tabelle, 60 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English