PREDICTION OF FLOW INDUCED SOUND AND VIBRATION OF PERIODICALLY STIFFENED PLATES
Résumé
Stiffened structures are very common in engineering applications, for instance the wing of an airplane
or the pressure hull of a submarine; both are subject to an excitation due to their movement
in the fluid around, namely the Turbulent Boundary Layer (TBL) excitation. For improving the
knowledge about the interaction between stiffened structures and TBL, this paper deals with the
modelling of infinite periodically rib-stiffened plates excited by TBL. The mathematical formulation
of the problem is well established in the literature. The originality of the present work relies
on the use of a reciprocity technique for evaluating the response of the plate to convected harmonic
pressure waves. The present approach allows then to compute the vibro-acoustic response of the
plate due to the TBL from the response of the stiffened plate to a point mechanical force and to an
acoustic monopole. Results in the physical space and the wavenumber space show the filter effect
of the stiffened plate and the role of the supersonic domain on the far field radiation. They allow us
to interpret the influence of the periodicity of the stiffeners on the vibration and the far-field noise
for plates excited by TBL.
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