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Thursday, July 11 • 10:20 - 10:40
IMPACT OF 3D PRINTED THIN WALL ON HELMHOLTZ RESONATOR ACOUSTIC RESPONSE: EXPERIMENTAL INVESTIGATATIONS

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3D printed Helmholtz resonators were tested on an impedance tube for absorption coefficient in 400-6400 Hz frequency range. Unexpected absorption phenomenon was reported. Two hypotheses to explain the mechanism of energy dissipation were verified: viscous friction in 3D printed-induced porosity and vibration of thin viscoelastic structure in a membrane-like absorber behavior. Using a combined experimental and analytical approach, it was shown that vibration of thin-wall, rather than the induced porosity, was at the origin of energy dissipation. The results presented in this work alert acoustician community about a dissipation effect related to the vibration of thin structures and provide new possibilities for development of 3D printed sound absorbing materials.

Moderators
FA

francesco Asdrubali

Full Professor, Università Roma Tre - Department of Engineering
TD

Thomas Dupont

Associate Professor, École de Technologie Supérieure (ÉTS)
PL

Philippe Leclaire

Prof., ISAT - University of Burgundy
avatar for Raymond Panneton

Raymond Panneton

Ing., Ph.D., GAUS, Université de Sherbrooke
Raymond Panneton is a professor-researcher in the Department of Mechanical Engineering at the Université de Sherbrooke since 1998. His research program focuses on the modeling, characterization and optimization of porous acoustic media. More specifically, he explores the relationships... Read More →

Authors

Thursday July 11, 2019 10:20 - 10:40 EDT
St-Laurent 5