G.A.U.S., Mech. Eng. Dept., Univ. de Sherbrooke, Sherbrooke, PQ J1K 2R1, Canada
A study of the acoustic radiation in light fluids of a nonbaffled vibrating plate with arbitrary boundary conditions is conducted. A new approach using integral formulations combine with polynomial interpolations (Ritz method) is proposed to compute both the vibrations and the acoustic radiation of the plate. The formulation used to compute the acoustic radiated power is expressed in terms of jump of pressure through the plate. Simulations using different boundary conditions have been conducted in both cases, with baffled and with nonbaffled plate. Comparison between both cases reveals the considerable effect of baffles on the modal and nonmodal radiation efficiencies in the lower frequencies. Comparisons are also made between cases with different boundary conditions (clamped--clamped--clamped--clamped, free--free--free--free, and simply supported--SS--SS--SS). Details of the formulations along with their numerical implementations are described and the results showing the effects of a baffle on the acoustic radiation are presented. Finally, the comparisons between the various cases are commented as a conclusion of the study.