In flow acoustic characterisation of a 2D active liner with local and non local strategies.

Billon, Kévin; Bono, Emanuele De; Perez, Matthias; Salze, Édouard; Matten, Gaël; Gillet, Martin; Ouisse, Morvan; Volery, Maxime; Lissek, Hervé; Mardjono, Jacky; Collet, Manuel

doi:10.1016/j.apacoust.2022.108655

Cited by 12 publications

(11 citation statements)

References 21 publications

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“…The local control strategy has been used identical in its implementation to that previously defined in the article. 11 The efficiency zone is located around the resonance frequency of the locally controlled loudspeaker. This frequency is defined as: Frequencies where the control is efficient depending on the parameters µ 1 and µ 2 are given in table 1.…”

Section: Resultsmentioning

confidence: 99%

“…In this section, the acoustic characterisation of the active liner (a 2D active liner based on an array of electroacoustic absorbers) is presented. The control law is implemented by pressure-based, current-driven digital architecture for impedance control (similar that control implementation in the previous experimental campaign 11 ). Local control strategy is experimentally validated with air flow on the NLR wind tunnel test rig.…”

Section: Discussionmentioning

confidence: 99%

“…The active liner is composed of 39 cells (3 lines of 13 cells) covered by a wiremesh to avoid turbulences in front of the microphones and protect the cells with flow. Each active cell is similar to the cells used for the previous experimental campaign 11 which the control law is implemented by pressure-based, current-driven digital architecture for impedance control. In the facility duct, the active liner is mounted with a rigid wall or the passive liner (540A) in front of (Figure 3).…”

Section: Active Linermentioning

confidence: 99%

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2D Active Liner Experimental Results in Acoustic Flow Duct Facility

Billon

Collet

Salze

et al. 2022

ASME 2022 Conference on Smart Materials, Adaptive Structures and Intelligent Systems

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This paper is focused on experimental characterization of new active liners technologies in acoustic flow duct facilities (FDF). These measurements have been performed in the NLR (Netherlands Aerospace Center). Different configurations of passive and active treatments have been tested using the same grazing flow conditions (Mach 0.3) in an aeroacoustic test bench: 1 conventional liner (standard SDOF sandwich panels with honeycomb core) used as reference and a 2D active liner based on an array of electroacoustic absorbers. The grazing flow test campaign comprises acoustics and aerodynamics measurements to characterize the aeroacoustics flow conditions, the membrane behavior, the acoustic impedance and the resulting insertion loss.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Active Linermentioning

confidence: 99%

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2D Active Liner Experimental Results in Acoustic Flow Duct Facility

Billon

Collet

Salze

et al. 2022

ASME 2022 Conference on Smart Materials, Adaptive Structures and Intelligent Systems

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“…The active liner 13 is made of a distributed arrays of unit cells composed of a transducer (a loudspeaker), 4 microphones and a control card with implemented control strategy (Figure 1) covered by wiremesh as depicted in figure 1. The liner is mounted in the inlet section of the engine just before the fan.…”

Section: The Active Liner and The Test Facilities 21 The Active Liner...mentioning

confidence: 99%

“…So the current driving the loudspeaker in is controlled in order to obtain a synthetic impedance : The computation of Z c (s) necessitates inversion of the loudspeaker dynamic and is achieved with a specific algorithm. 10,11,13 Figure 2. Cell control system.…”

Section: The Active Liner and The Test Facilities 21 The Active Liner...mentioning

confidence: 99%

Smart acoustic lining for UHBR technologies engine: from the design of an electroacoustic metasurface to experimental characterization under flow

Billon

Gillet

Salze

et al. 2023

Active and Passive Smart Structures and Integrated Systems XVII

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The SALUTE project aims at evaluating performance of electroacoustic metasurface, employing a surface array of controlled electroacoustic actuators, for smart acoustic lining under grazing turbulent flow to be used in UHBR Technologies Engines. Theoretical and numerical investigations have been carried out for designing innovative concepts for complex aero-acoustic characterization in an engine mock-up. A specific focus was placed in the realization of prototypes for evaluating the metacomposite liner performances in 3D liners close to real engine implementation, its process complexity and robustness. This project provides new tools for designing smart acoustic liners; while acoustical experimental tests demonstrate efficiency and robustness of such technology for controlling UHBR noise emission. This paper presents the concept development from theory to technological realization and characterization by produced numerical tools. The experimental results obtained with the liners in acoustic flow duct facilities (FDF) have been realized in the PHARE facilities of Ecole Centrale de Lyon. Different configurations of liners have been tested using similar flow conditions as in target engine: 1 passive liner used as reference and a 3D active liner based on an array of electroacoustic absorbers. The final tests campaign comprises acoustics and aerodynamics measurements to characterize the aeroacoustics flow conditions, the membrane behavior, the achieved synthetic acoustic impedance and the resulting insertion loss.

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