Issue |
Acta Acust.
Volume 8, 2024
Topical Issue - Active Noise and Vibration Control
|
|
---|---|---|
Article Number | 56 | |
Number of page(s) | 12 | |
DOI | https://doi.org/10.1051/aacus/2024052 | |
Published online | 18 October 2024 |
Scientific Article
Towards an active semi-anechoic room: simulations and first measurements
1
Aix Marseille Univ, CNRS, Centrale Med, LMA, 4 impasse Nikola Tesla, 13013 Marseille, France
2
University of Applied Sciences and Arts Western Switzerland, 4 rue de la Prairie, 1202 Geneva, Switzerland
3
ARTEAC-LAB, 29 Rue Saint-Savournin, 13005 Marseille, France
* Corresponding author: pinhede@lma.cnrs-mrs.fr
Received:
27
February
2024
Accepted:
13
August
2024
Semi-anechoic rooms are used for the acoustic characterisation of noise sources. They involve heavy infrastructures and thick absorbent lining. The aim of this work is to demonstrate a less expensive alternative by complementing a thin passive coating with an active technology. Previous work has achieved the active reduction of the pressure scattered by the reflective wall of a semi-anechoic room, in the 80–200 Hz frequency band. This work validated an innovative approach allowing to control the scattered pressure throughout the measurement volume, using a setup located over its periphery. This paper extends a previous presentation at Forum Acusticum dealing with the active control of the low-frequency reflections on the walls and ceiling of a semi-anechoic room [Pinhède et al., Forum Acusticum 2023, Torino, Italy, 11–15 September, 2023, https://doi.org/10.61782/fa.2023.0399]. We describe the design principles and the 2D semi-analytical and 3D finite element simulations of the control system that help optimise parameters such as the transducers number and locations. A full-scale demonstrator has been built to validate the control strategy. Acoustics measurements, which have been used to characterise the room acoustics and to update the simulation parameters are also presented and compared to an updated numerical model.
Key words: Semi-anechoic room / Active noise control / Acoustical measurement / Active anechoicity
© The Author(s), Published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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