A synthesis approach for reproducing the response of aircraft panels to a turbulent boundary layer excitation

Teresa Bravo 1 Cédric Maury 2
2 Sons
LMA - Laboratoire de Mécanique et d'Acoustique [Marseille] : UPR7051
Abstract : Random wall-pressure fluctuations due to the Turbulent-Boundary Layer (TBL) are a feature of the air flow over an aircraft fuselage under cruise conditions, creating undesirable effects such as cabin noise annoyance. In order to test potential solutions to reduce the TBL-induced noise, a cost-efficient alternative to in-flight or wind-tunnel measurements involves the laboratory simulation of the response of aircraft sidewalls to high-speed subsonic TBL excitation. Previously published work has shown that TBL simulation using a near-field array of loudspeakers is only feasible in the low frequency range due to the rapid decay of the spanwise correlation length with frequency. This paper demonstrates through theoretical criteria how the wavenumber filtering capabilities of the radiating panel reduces the number of sources required, thus dramatically enlarging the frequency range over which the response of the TBL-excited panel is accurately reproduced. Experimental synthesis of the panel response to high-speed TBL excitation is found to be feasible over the hydrodynamic coincidence frequency range using a reduced set of near-field loudspeakers driven by optimal signals. Effective methodologies are proposed for an accurate reproduction of the TBL-induced sound power radiated by the panel into a free-field and when coupled to a cavity.
Type de document :
Article dans une revue
Journal of the Acoustical Society of America, Acoustical Society of America, 2011, 129 (1), pp.143-153. <10.1121/1.3514530>
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Soumis le : lundi 18 octobre 2010 - 18:36:17
Dernière modification le : jeudi 28 avril 2016 - 10:47:37

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Teresa Bravo, Cédric Maury. A synthesis approach for reproducing the response of aircraft panels to a turbulent boundary layer excitation. Journal of the Acoustical Society of America, Acoustical Society of America, 2011, 129 (1), pp.143-153. <10.1121/1.3514530>. <hal-00527311>

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