Panel sound absorbers

Widening the sound absorption bandwidths of flexible micro-perforated curved absorbers using structural and acoustic resonances

“…Tang and Ng [5,6], showed that the panel absorber effect of a flexible perforated panel, with an absorption frequency bandwidth at a lower frequency range, could be used to enhance low frequency absorption. Various researchers [7][8][9][10][11][12], have presented theoretical and experimental analyses of a panel absorber without perforation showing that the sound absorption mechanism of a panel absorber was due to panel/cavity resonance. These analyses however, apart from the study by Ford and McCormick [7], have not taken into account the bending stiffness of the panel.…”

Analysis of Low Frequency Acoustic Response in a Damped Rectangular Enclosure

“…Three panels with stiffness values (0Á5E p , E p , 1Á5E p ), where E p is the actual Young's modulus of the panels, were used to describe the effect of differences in panel parameters on the resonance frequencies of the modes. The behaviour of speci®c acoustic admittance shown in Figure 4 is very similar to that of traditional panel sound absorbers [8]. Figure 4 shows that the speci®c acoustic admittance is characterised by the resonance absorption of the ®rst panel mode.…”

Sound and vibration analysis of a nonlinear panel absorber mounted on an enclosure panel using the multi-level residue harmonic balance method

“…However, with the exception of [8], these analyses have neglected the bending stiffness of the panel. In addition, it is generally assumed that the panel motion vibrates with a small degree of amplitude.…”

“…A variety of theoretical and experimental analyses of panel absorbers have also been carried out [8][9][10][11][12]. However, with the exception of [8], these analyses have neglected the bending stiffness of the panel.…”