Sound transmission through a rib-stiffened plate : comparisons of a light fluid approximation with experimental results

Abstract : Interest in stiffened plate constructions has been widespread recently in aerospace, marine and engineering structures : their vibratory response can be greatly modified by small weight added to the hull. Semi-analytical and finite element modellings are mostly based on a weak (energetic) formulation of the in vacuo problem. First, the analysis has been simplified by applying the so-called orthotropic equivalent plate theory only valid when the mechanical wavelengths are greater than the stiffeners spacing~; a more accurate and robust method is the discrete model in which the system is divided into subelements~: the stiffeners are therefore considered as beams exerting efforts on the plate. Moreover, the vibro-acoustic response of the system fluid/structure is approximated under the assumption that the fluid-loading is a small perturbation with respect to the in vacuo problem since the surrounding fluid is a gas. This paper applies this approximation to the case of a baffled plate stiffened by ribs.
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Journal of Sound and Vibration, Elsevier, 2002, 249 (1), pp.206-212. 〈10.1006/jsvi.2001.3684〉
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Cédric Maury, Pierre-Olivier Mattei. Sound transmission through a rib-stiffened plate : comparisons of a light fluid approximation with experimental results. Journal of Sound and Vibration, Elsevier, 2002, 249 (1), pp.206-212. 〈10.1006/jsvi.2001.3684〉. 〈hal-00166284〉

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