Acoustical properties of 3D printed functionally-graded porous structures with triply periodic minimal surfaces

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Issue Date
2019-04-19
Authors
Scroggins, Amanda
Wojciechowski, Brittany
Sample, Trenton
Advisor
Sharma, Bhisham N.
Citation

Scroggins, Amanda, Wojciechowski, Brittany, Sample, Trenton. 2019. Acoustical properties of 3D printed functionally-graded porous structures with triply periodic minimal surfaces -- In Proceedings: 19th Annual Undergraduate Research and Creative Activity Forum. Wichita, KS: Wichita State University, p. 25

Abstract

Structures with triply periodic minimal surfaces (TPMS) have recently been shown to possess attractive mechanical properties such as high stiffness-to-density and strength-to-density ratios. In this study, we investigate the absorption coefficient of porous TPMS structures with a view towards their possible use as acoustic liners for reducing aircraft engine noise. Porous structures with controlled microstructures were fabricated for experimental testing using MATLAB and a Form 2 stereolithographic 3D printer. The sound absorption coefficient of the fabricated structures was measured using a two-microphone impedance tube setup and in accordance with ASTM E1050-12. The effect of surface topology on the acoustic properties was characterized by testing four different TPMS geometries. The gyroid geometry was then selected to study the effect of relative density on its acoustic properties. Finally, the effect of functionally-graded through-thickness relative density variation was studied. The obtained results show that TPMS structures offer a novel path towards the design of multifunctional structures with good mechanical and acoustical properties.

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Description
First place winner of oral presentations for Natural Sciences and Engineering at the 19th Annual Undergraduate Research and Creative Activity Forum (URCAF) held at the Rhatigan Student Center, Wichita State University, April 19, 2019.
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