Publication: Evaluation of air partitioning effect on acoustic behaviours of micro perorated panel
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Date
2024-07-11
Authors
Muhammad Zahir bin Ahmad Zaila
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Abstract
Due to rapid mobility, industry, and urbanisation, urban noise pollution is growing. Thus, noise control is essential. Micro-perforated panels (MPPs) are a key technology in architectural acoustics and noise control because they efficiently attenuate sound across a wide frequency band. Perforation geometry, material qualities, and air cavity arrangement affect the acoustic properties of these panels, which have millimetre-sized perforations. This study thoroughly examines how air partitioning affects MPP acoustics. This study investigates the sound absorption coefficient effects of air partitioning as MPP, perforation pattern parameter, and airgap size. This will boost MPP sound absorption coefficient. Siemen Simcenter3D with a 10mm, 20mm and 30mm of airgap will be used for the initial simulation. The study evaluated the sound absorption performance of micro-perforated panels (MPPs) by preparing samples with varying perforation patterns (straight and staggered) and airgap depths (10mm, 20mm, and 30mm), while keeping perforation thickness and diameter constant. Using MATLAB simulations based on the Maa prediction model, and experimental measurements from an impedance tube, the Sound Absorption Coefficient (SAC) was analysed. The results showed that increasing perforation thickness and size enhanced SAC, shifting peak absorption to higher frequencies and reducing bandwidth. Different airgap depths influenced the absorption efficiency, with deeper gaps improving low-frequency absorption. The study validated the simulation results against experimental data, highlighting the potential for optimizing MPP designs for commercial sound absorbers by adjusting perforation patterns and airgap designs, thereby enhancing noise reduction and architectural acoustics.