SLA-Printed Porous Acoustic Meta-Material

Acoustic design significantly impacts the comfort of the built environment, and acoustic design mainly relies on sound absorption to eliminate noise. Depending on the features of functions and surroundings, acoustic design needs an array of specific solutions. This research focuses on metamaterials based on passive destructive interference (PDI) to explore solutions for highly tailored sound-absorbing metamaterials. This selection was made owing to the PDI absorbers’ unusual shape and acoustic performance relationship. We propose hexagonal unit cells for forming periodic foam structures in acoustic metamaterials, with a shift in every alternate layer. Afterward, these are characterized using the Johnson-Champoux and Allard (JCA) model. Concentrating on tailored geometry involves employing essential fabrication techniques for sample viability. Additive manufacturing is utilized because it permits manufacturing one-of-a-kind goods even when intricate and freeform designs are present. The primary purpose of the proposed work is to conduct laboratory tests to evaluate the sound absorption coefficient of specimens made by additive manufacturing. This will provide comprehension of the fundamental behavior of acoustics performances. To verify the suggested design, the recommended geometry is simulated with numerical calculations to match experimental data. This paper proposes a novel technique to customize the absorption spectrum for noise reduction and other acoustics applications using designed periodic foam structures.