COUPLING BETWEEN RECTANGULAR PANEL MODES AND ACOUSTICAL MODES IN RECTANGULAR CAVITY | ||
| AL-TAQANI | ||
| Article 1, Volume 23, Issue 1, February 2010, Pages 1-18 | ||
| Authors | ||
| Adnan D. Mohamed; ; Saffa H. abdul; Hassan H. Mahdi; Mahmood A. Hassan | ||
| Abstract | ||
| The response of structure to internal sound in an enclosure has received a considerable attention from designers because of the induced stresses in the structure from acoustic excitation. The main aim of this research was to investigate the modal interaction between structural modes and acoustical modes using different coupled configurations and evaluation of the response of the structure theoretically and experimentally. Another objective was to investigate the effect of damping, thickness, material properties, boundary condition on the radiation efficiency. The analysis involved the prediction of energy transfer between acoustic and the structural systems employing the well known coupled oscillatory theory. A system consists of a flexible rectangular (simply supported and simply clamped) panel, which forms one wall of rigid rectangular box, is analyzed analytically. The acoustic space is excited by a random source and the results of averaged radiation efficiency from the panel were predicted in different 1/3 octave frequency bands. Acceptable agreement between experimental and theoretical results is observed from the model of panel cavity. The results of this work show that the radiation efficiency, increases with increasing the thickness of the panel, and decreases with increasing the damping of the structure and acoustic space. The results also show that the radiation efficiency of brittle material is higher than that of ductile material; it is observed that the boundary condition of the structure has a great effect on the radiation efficiency. The response of the simply clamped panel is higher than that of simply supported panel. | ||
| Keywords | ||
| coupling; acoustical modes; structural modes and rectangular cavity | ||
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