Tunable flat-plate absorber design for active sound absorption

Bjornsson, Kristinn (Signal Processing Laboratory LTS2, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland) ; Boulandet, Romain (Signal Processing Laboratory LTS2, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland) ; Lissek, Hervé (Signal Processing Laboratory LTS", Ecole Polytechnique fédérale de Lausanne (EPFL), Lausanne, Switzerland)

Noise reduction at low frequencies is a major issue in many workspaces and indoor public places. Unlike mid- and high-frequency noise, low frequency noise is less attenuated by using conventional sound absorbing materials. This communication proposes an electro-mechano-acoustic absorber model that couples three physical domains using plate vibration and sound radiation theories. The mechanical system is an elastically suspended plate specifically developed to favor the piston-like movement thereof. An electromechanical transducer is attached to the plate in order to tailor its dynamic response to incident pressure waves, thereby improving the sound absorption capacity of the system. Structural Mechanics module and Acoustics module are used in this study. We present the design and modeling of this electro-mechano-acoustic system, including the feedback control law which allows to turn it into a tunable electroacoustic absorber. The acoustic performance experimentally achieved from a prototype absorber are then compared to the simulation results.

Note: BOULANDET, Romain est un chercheur à la HES-SO, HEPIA, depuis 2018.

Conference Type:
full paper
Ingénierie et Architecture
HEPIA - Genève
inSTI - Institut des Sciences et Technologies industrielles
Lausanne, Switzerland, 14 October 2018
Lausanne, Switzerland
14 October 2018
5 p.
Published in:
Proceedings of COMSOL Conference, 14 October 2018, Lausanne Switzerland
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 Record created 2020-08-25, last modified 2020-10-27

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