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  4. Development of a wideband steerable acoustic metasurface composed of active electroacoustic resonators with COMSOL
 
conference presentation

Development of a wideband steerable acoustic metasurface composed of active electroacoustic resonators with COMSOL

Lissek, Hervé  
•
Rivet, Etienne  
•
Laurence, Thomas  
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October 22, 2018
COMSOL Conference 2018

The recent introduction of acoustic metamaterials and metasurfaces in the literature has triggered an tremendous interest in the scientific community, with their capability to achieve extraordinary acoustic properties for various acoustic and noise control applications, although limited frequency-wise. Coupled with active acoustic control concept, a step towards broadband extraordinary properties has been unveiled. We present the design of an active acoustic metasurface concept allowing steering reflected wavefronts toward a prescribed direction over a wide frequency bandwidth, thanks to active unit-cells. The metasurface is composed of an array of small (with respect to the wavelength) loudspeakers, the acoustic impedance of which can be programmed through active impedance control in order to adjust the reflection phase at each position over the metasurface. The control strategy inspires from the Active Electroacoustic Resonator concept, using a microphone feedback and a current-driven control, allowing achieving a wide range of acoustic impedances on the loudspeaker diaphragm. Numerical simulation with COMSOL Multiphysics Acoustic Module allows assessing the global performance of the concept, and open the discussion on possible practical applications.

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Type
conference presentation
Author(s)
Lissek, Hervé  
Rivet, Etienne  
Laurence, Thomas  
Fleury, Romain  
Date Issued

2018-10-22

URL

See presentation at the Conference's site

https://www.comsol.com/paper/development-of-a-wideband-steerable-acoustic-metasurface-with-comsol-64311
Editorial or Peer reviewed

NON-REVIEWED

Written at

EPFL

EPFL units
LTS2  
LWE  
Event nameEvent placeEvent date
COMSOL Conference 2018

Lausanne, Switzerland

October 22-24, 2018

Available on Infoscience
September 23, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/161462
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