Iulian LUPEA, Florina-Anca STREMȚAN


Sound absorption is of continuous interest considering nowadays the increasing environmental sound pollution or the indoor proper conditions for activities like audition or sound recording. The panel absorber, a resonant acoustic device, is under observation in this paper. The associated differential equation of the acoustic system, followed by the acoustic impedance and the sound absorption coefficient are derived. Experimental validations are performed on a plastic suction pump, a plywood panel absorber and a box with aluminum front panel connected to the box rim by a thin latex rubber membrane. The analytical results and the experiments are in good agreement. Better results are expected by using the experimental modal analysis for the panel vibration.

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