Innovative Approaches to Sound Absorption in Agricultural Waste-Based Composites: The Role of Perforation Geometry

Abstract

This study explores the potential of agricultural waste-based composites, specifically sugarcane bagasse, as sustainable sound-absorbing materials. The research investigates the impact of partial perforations on the Sound Absorption Coefficient (SAC) of bagasse-based panels, with perforation diameters of 1, 2, and 3 mm and depths of 25%, 50%, 75%. Acoustic performance was evaluated using an impedance tube across the frequency range of 200–1600 Hz. The results reveal that panels with 1 mm diameter perforations and 75% depth exhibited the highest SAC, reaching up 0.98 at 1500–1600 Hz. These findings underscore the potential of perforation geometry as a key factor in enhancing the acoustic efficiency of bio-composite materials. This study highlights the viability of optimizing perforation designs to develop sustainable, high-performance sound absorbers, offering an eco-friendly alternative to conventional acoustic materials. The outcomes contribute to advancing circular economy practices by utilizing agricultural waste for noise mitigation in urban environments.

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