The effect of acoustic leakage on the sound absorption of an MPPSL

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Conference Proceeding
21st International Congress on Sound and Vibration 2014, ICSV 2014, 2014, 2 pp. 1310 - 1317
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The micro-perforated panel with shunted loudspeaker (MPPSL) absorber has been recently proposed, which provides a compact solution to broadband sound absorption by adjusting the electrical parameters in the shunted circuit. This paper investigates the leakage effect on the absorption of the MPPSL, where the absorption performance of an MPPSL under normal incidence with and without leakage is investigated based on the equivalent circuit model (EC) method instead of the modal analysis approach. Experiments are carried out to verify the proposed model, and both theoretical and experimental results show that another peak exists between the two resonance frequencies and the first resonance frequency shifts to lower frequency when leakage exists.
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