Effect of time delay on the impedance control of a pressure-based, current-driven Electroacoustic Absorber

Bono, Emanuele De; Collet, Manuel; Matten, Gaël; Karkar, Sami; Lissek, Hervé; Ouisse, Morvan; Billon, Kévin; Laurence, Thomas; Volery, Maxime

doi:10.1016/j.jsv.2022.117201

Cited by 15 publications

(23 citation statements)

References 35 publications

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“…Finally, these results show the interest of coupling the programmable EL to the tube, which can act as a nonlinear resonator and have interesting applications, such as nonlinear semi-passive control (acoustically passive but electrically active because of the loudspeaker). 29,30 However, it can be seen from Figure 6 that there are some zone, that is, between 710 and 800 Hz, where the response of the system with coupled EL presents higher amplitudes than the one of the tube without EL. In this study, we did not perform optimization of parameters for optimal attenuation of sound via EL.…”

Section: Resultsmentioning

confidence: 98%

Experimental evidences of nonlinear programmable electroacoustic loudspeaker

da Silveira Zanin,

Labetoulle,

De Bono

et al. 2023

Building Acoustics

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A two degrees-of-freedom system coupling an acoustical mode of a closed tube to an electroacoustic loudspeaker is considered. A model-inversion technique is presented to digitally program the impedance of the loudspeaker for reaching a targeted nonlinear behavior. Experimental results show that the programed nonlinearity can guide the system to both periodic and non-periodic responses while acoustical levels for activation of the nonlinearity are less than the ones for systems with passive nonlinear oscillators (94 and 100 dB in this paper compared to 138 dB in previous papers), allowing building applications. Moreover, it is spotted that the programed nonlinearity of the electroacoustic loudspeaker, even in its non-optimized form, performs nonlinear noise control for some frequency ranges. The main objective of this article is to show that it is possible to program the behavior of an electroacoustic loudspeaker.

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Section: Resultsmentioning

confidence: 98%

Experimental evidences of nonlinear programmable electroacoustic loudspeaker

da Silveira Zanin,

Labetoulle,

De Bono

et al. 2023

Building Acoustics

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“…Its impedance can be controlled by a pressure-based current-driven architecture. 2 Despite the physiological time delay of the digital control, which can affect the passivity margins at high frequencies, 3 such ER strategy has demonstrated its efficiency for both room-modal equalization 4 and sound transmission mitigation in waveguides. [5][6][7][8][9] The model-inversion algorithm has also been extended to contemplate nonlinear target dynamics at low excitation levels.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8][9] The model-inversion algorithm has also been extended to contemplate nonlinear target dynamics at low excitation levels. [10][11][12][13] In, 14 for the first time, a programmable liner involving the spatial derivative was realised by distributed electroacoustic devices. It was the first form of the Advection Boundary Law (ABL), then implemented on ER arrays lining an acoustic waveguide in, [15][16][17] where it demonstrated non-reciprocal sound propagation.…”

Section: Introductionmentioning

confidence: 99%

Breaking the limitations of local impedance noise control: passivity, and scattering performances of the Advection Boundary Law

De Bono,

Collet,

Ouisse

2024

Active and Passive Smart Structures and Integrated Systems XVIII

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In the aim of attenuating noise transmission through air-ducts, research is prompted for overcoming the limitations of classical acoustic liners, especially in the aero-engines applications. The new generation of Ultra-High-By-Pass-Ratio (UHBR) turbofans while considerably reducing fuel consumption, increases noise pollution especially at lower frequencies because of their larger diameter, lower number of blades and rotational speed. Moreover, they present a shorter nacelle, leaving less available space for acoustic treatments. In case of simplified one-dimensional propagation, integral constraints exist which analytically define the limits of the scattering performances of reciprocal systems, such they are the local impedance liners, for a fixed length of the acoustic treatment along the duct. In this contribution, we analyse a special boundary condition breaking the reciprocity principle, and overcoming the limitations of locally reacting liners. We call it Advection Boundary Law as it introduces a convection on the boundary, responsible of non-reciprocal behaviour at grazing incidence, and of the enhancement of transmission loss with respect to pure locally-reacting resonators. Performances and passivity of such boundary law are numerically analysed first in grazing-incidence problems. The grazing-incidence problem is experimentally studied in a plane-wave acoustic waveguide lined by electroacoustic resonators which can be programmed to reproduce such advection boundary law.

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“…Such behaviour is unwelcome, even if it occurs outside of the frequency band of interest, because it can result in an unstable positive acoustic feedback. In other words, if at a given frequency, the absorber injects more energy than the acoustic environment dissipates, energy will build-up, leading to an instability [10].…”

Section: Introductionmentioning

confidence: 99%

Robust direct acoustic impedance control using two microphones for mixed feedforward-feedback controller

2023

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This paper presents an acoustic impedance control architecture for an electroacoustic absorber combining both feedforward and feedback microphone-based strategies on a current-driven loudspeaker. Feedforward systems enable good performance for direct impedance control. However, inaccuracies in the required actuator model can lead to a loss of passivity, which can cause unstable behaviour. The feedback contribution allows the absorber to better handle model errors and still achieve an accurate impedance, preserving passivity. Numerical and experimental studies were conducted to compare this new architecture against a state-of-the-art feedforward control method.

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Effect of time delay on the impedance control of a pressure-based, current-driven Electroacoustic Absorber

Cited by 15 publications

References 35 publications

Experimental evidences of nonlinear programmable electroacoustic loudspeaker

Experimental evidences of nonlinear programmable electroacoustic loudspeaker

Breaking the limitations of local impedance noise control: passivity, and scattering performances of the Advection Boundary Law

Robust direct acoustic impedance control using two microphones for mixed feedforward-feedback controller

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