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dc.contributor.authorJohnston, William
dc.contributor.authorSharma, Bhisham
dc.date.accessioned2021-06-01T03:17:58Z
dc.date.available2021-06-01T03:17:58Z
dc.date.issued2021-05-01
dc.identifier.citationJohnston, W., & Sharma, B. (2021). Additive manufacturing of fibrous sound absorbers. Additive Manufacturing, 41 doi:10.1016/j.addma.2021.101984en_US
dc.identifier.issn2214-7810
dc.identifier.issn2214-8604
dc.identifier.urihttps://doi.org/10.1016/j.addma.2021.101984
dc.identifier.urihttps://soar.wichita.edu/handle/10057/20065
dc.descriptionThis article is available in SOAR. Click on the DOI to access the publisher’s version (may not be free)en_US
dc.description.abstractWe investigate the possibility of additively manufacturing fibrous sound absorbers using fused deposition modeling. Two methods for 3D printing fibers are proposed. The fiber bridging method involves extruding the filament between two points with no underlying supports. The extrude-and-pull method involves extruding a filament droplet before pulling away the extruder rapidly to generate thin fibers. Both methods can produce fibers with aspect ratios greater than 100. Optical microscopy is used to investigate the effect of various printing parameters on the fiber characteristics. The sound absorption coefficient of samples printed using the two techniques are measured using a two-microphone normal incidence impedance tube setup. Effects of printing parameters and fiber density variables are experimentally studied. The experimental studies are supported by the Johnson-Champoux-Allard semi-empirical analytical model informed using an inverse characterization approach. The analytical model is then utilized to understand the effect of fiber parameters on the acoustical transport parameters. It is observed that the two methods result in individual fibers with distinct characteristics. On average, the fiber bridging method results in thicker fibers, which results in comparatively higher sound absorption. However, the extrude-and-pull method results in fibers with hair-like characteristics (thick base with progressively decreasing thickness) and one may easily incorporate it within existing additive manufacturing routines to add fibers to a base surface, thus opening up a new route towards fiber-enhanced multifunctional structures.en_US
dc.language.isoen_USen_US
dc.publisherElsevieren_US
dc.relation.ispartofseriesAdditive Manufacturing;Vol. 41
dc.subjectFibersen_US
dc.subjectSound absorptionen_US
dc.subjectNoise reductionen_US
dc.subjectMultifunctional structuresen_US
dc.subjectPorous structuresen_US
dc.titleAdditive manufacturing of fibrous sound absorbersen_US
dc.typeArticleen_US
dc.rights.holder© 2021 Elsevier B.V. All rights reserved.en_US


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    Research publications authored by the Department of Aerospace Engineering faculty and graduate students.

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