Influence of Perforation Angle and Infill Density on Sound Absorption Coefficient of 3D Printed Bio-degradable PLA Panel
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Abstract
Noise pollution is a major environmental challenge that drives the need for sustainable sound-absorbing materials. Conventional absorbers are often derived from hazardous, non-biodegradable polymers, whereas polylactic acid (PLA) offers a non-toxic, biodegradable, and recyclable alternative. This study investigates the sound absorption coefficient (SAC) of 3D-printed, disc-shaped PLA panels with perforations. A detailed numerical analysis, using a virtual impedance tube in COMSOL Multiphysics software, along with experimental validations with the help of a real impedance tube are carried out. The influence of the thickness of the disc, infill ratio, and perforation angles on acoustic performance is systematically examined. Results indicate that both perforation angles and infill density significantly affect SAC. This helps in developing PLA discs for improved sound absorption while maintaining their lightweight, compact, and cost-effective designs. These findings establish PLA as a promising sustainable alternative to synthetic acoustic materials, offering new opportunities for eco-friendly noise control solutions in industrial and architectural applications.
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