Sound absorption coefficient measurement and analysis of bio-composite micro perforated panel (BC-MPP)

The sound absorption performance of bio-composite micro-perforated panel (BC-MPP) made from composite polypropylene (PP) filled rice husk (PP/RH), and coconut coir (PP/CC) is presented. The sound absorption coefficient (SAC) of BC-MPP was obtained via the impedance tube two-microphone method, and the investigation was according to types of fillers, filler compositions, perforation ratio, and the air gap size. It was found that the SAC of BC-MPP PP/RH provides a higher SAC value than BC-MPP PP/CC. Furthermore, the SAC peak was observed to shift to the lower frequency spectrum when there was an increment in filler content, the distance between the perforation, and the air gap size. The SAC value from the simulation also shows a good agreement with the experimental result.