Active control of the field scattered by the rigid wall of a semi-anechoic room—Simulations and full-scale off-line experiment

Pinhède, Cédric; Habault, Dominique; Friot, Emmanuel; Herzog, Philippe

doi:10.1016/j.jsv.2021.116134

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…In a previous paper [7], 2D simulations were performed in the 20 − 400 Hz range with 102 modes. The modal damping rates used in the analytical model were derived from a FEM model of the cavity considering a 2% absorption coefficient with purely reel impedance, over the upper walls; these rates account for the dissymmetry of the absorption.…”

Section: Results From 2d Simulationsmentioning

confidence: 99%

“…This requires to know the scattered (or direct) and total fields for a number of source distributions and to solve the associated linear inverse problem. One possible mean is to move a "reference source" of known radiation pattern into the volume to generate the necessary data [5], taking into account the image field generated by the ground. Then a classic control is applied to cancel the estimated scattered pressure.…”

Section: Identification Of Scattering Filters and Controlmentioning

confidence: 99%

“…Then, the exact scattered pressures p sca are deduced from p dir and p tot as: The identification of the scattering filter is obtained by solving Eqn. ( 5) from this dataset, see details in [5].…”

Section: Identification Step Of the Scattering Filtermentioning

confidence: 99%

See 2 more Smart Citations

Towards an active semi-anechoic room : simulations and first measurements

Pinhède,

Boulandet,

Friot

et al. 2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Semi-anechoic rooms are used for the acoustic characterization of noise sources. They involve heavy infrastructures and thick absorbent lining. The purpose of the ongoing project "DADA" (Dôme Anti-Diffraction Acoustique) is to demonstrate a lower-cost alternative by supplementing a thin passive lining with active technology. This project targets an actual size functional demonstrator, an important milestone before tackling a fully active anechoic room at the Laboratory of Mechanics and Acoustics (LMA). 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. These results validated an innovative approach allowing to control the scattered pressure throughout the measurement volume, using a setup located over its periphery. The DADA project extends these results by dealing with the five non-reflecting walls of a semi-anechoic room. Analytical and FEM simulations are described and discussed. They allow a parametric study of many design aspects, including the structure of the active control system and transducers locations. The resulting design will be presented, together with simulations able to deal with test sources of increasing complexity.

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Section: Results From 2d Simulationsmentioning

confidence: 99%

Section: Identification Of Scattering Filters and Controlmentioning

confidence: 99%

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Towards an active semi-anechoic room : simulations and first measurements

Pinhède,

Boulandet,

Friot

et al. 2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Multizone active noise control for impulsive scattered sound of a rigid cylinder

Feng

Wang

et al. 2023

Applied Acoustics

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Towards an active semi-anechoic room: simulations and first measurements

Pinhède,

Boulandet,

Friot

et al. 2024

Acta Acust.

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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.

show abstract

Active control of the field scattered by the rigid wall of a semi-anechoic room—Simulations and full-scale off-line experiment

Cited by 6 publications

References 24 publications

Towards an active semi-anechoic room : simulations and first measurements

Towards an active semi-anechoic room : simulations and first measurements

Multizone active noise control for impulsive scattered sound of a rigid cylinder

Towards an active semi-anechoic room: simulations and first measurements

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