ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

4pSAb1. Vibration and sound radiation of Mindlin plates including in-plane motion, stiffened by thin walled beams.

C. Locqueteau

A. Berry

GAUS, Dept. of Mech. Eng., Univ. of Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada

Stiffened panels such as those encountered in marine structures may exhibit in-plane motion in the panel due to the coupling with the deformation of the stiffeners. Most of the published papers on Mindlin stiffened plates do not take into account the in-plane motion of the panel. This paper presents a vibroacoustic model of finite, stiffened panel including flexion, shear, and in-plane motion of the panel, and flexion, torsion, and warping of the thin-walled beam stiffeners. The vibration problem is solved through a Rayleigh--Ritz approach, both for the fluid-coupled and the uncoupled cases. The numerical results are compared to recently published data. The effects of shear deformation and in-plane deformation of the panel are systematically investigated in terms of the panel response and sound radiation, and the results are compared to a simpler model retaining only pure flexural deformation of the panel and stiffeners. [Work supported by Defense Research Establishment Atlantic, Contract OSC92-01908.]