Study On Inhomogeneous Micro-Perforated Panel Sound Absorber With Cross Perforation Arrangement

Mohd Zan, Sulaiman (2021) Study On Inhomogeneous Micro-Perforated Panel Sound Absorber With Cross Perforation Arrangement. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Effect of inhomogeneous perforation for Micro Perforated Panel (MPP) has been discussed in the literatures but not for the MPP cross perforation arrangement. This project studies the effect of the cross-perforation arrangement to the sound absorption performance. The simulation was first conducted to simulate the performance of the MPP followed by the experimental validation. The experimental method was used to valid the simulation result. The project can be analysed by studying three main parameters effecting the sound absorption coefficient which are perforation ratio, hole diameter and cavity depth. The research found that the decreasing in hole diameter reduced the absorption bandwidth. Decreasing the perforation ratio shift the peak of absorption to lower frequency. Then, increasing the cavity depth increases sound absorption coefficient at low frequency. The simulation result of inhomogeneous MPP separation perforation has two peak frequencies because of each hole diameter reacts at own cavity depth, but for the experiment have only one peak frequency because the cross-sectional perforation reacts randomly on two cavity depths

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