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Tuesday, July 9 • 16:30 - 16:50
THERMO-VISCO-ACOUSTIC METAMATERIALS TO DAMP ACOUSTIC MODES IN A COMPLEX GEOMETRY

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This presentation demonstrates that acoustic metamaterials can be used as an alternative to conventional acoustic materials to absorb acoustic modes in a hollow vessel, where the volume available for the acoustic treatment is limited and the geometry is complex. The metamaterials are placed in the limited available volume around the chamber. The metamaterials proposed here are based on periodic neck-cavity systems. Owing to the fact that the cavities are small and of complex shapes, numerical thermo-visco-acoustic simulations are used to simulate the acoustics of the metamaterials. Since these simulations are time consuming, they are paired with the analytical transfer matrix method. Here, only a periodic cell of the metamaterial is solved numerically. From this solution, the transfer matrix of the periodic cell is derived and periodized. Following this approach, the shape and geometric parameters of the thermo-visco-acoustic metamaterial are optimized in terms of the absorbed modes (number and frequencies) and the available volume.

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Authors
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 →
TD

Thomas Dupont

Associate Professor, École de Technologie Supérieure (ÉTS)


Tuesday July 9, 2019 16:30 - 16:50 EDT
St-Laurent 5