Experimental assessment of an active (acoustic) liner prototype in an acoustic flow duct facility

Kevin Billon (1) , E de Bono (1) , M Perez (1) , E Salze (2) , G Matten (3) , M Gillet (3) , M Ouisse (3) , M Volery (4) , H Lissek (4) , J Mardjono (5) , M Collet (1)

1 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes
2 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique
3 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)
4 EPFL - Ecole Polytechnique Fédérale de Lausanne
5 Safran Aircraft Engines

In this paper, experimental results of broadband noise reduction in an acoustic flow duct are presented. An active liner composed of an array of electroacoustic absorbers is used. The control law is based on the pressure-based, current driven digital architecture for impedance control with a local control strategy. A wind tunnel test rig named Caïman has been used for the experimental validation. The results confirm the adaptability and the stability of the whole system with the local control strategy. The air flow slightly reduces the efficiency while maintaining the adaptability and the stability.

Mots clés: Electroacoustic absorber; Impedance control; Broadband noise reduction; Active liner

Domaines: Mécanique [physics]

Kevin Billon, E de Bono, M Perez, E Salze, G Matten, et al.. Experimental assessment of an active (acoustic) liner prototype in an acoustic flow duct facility. SPIE, Mar 2021, Los Angeles, United States. ⟨10.1117/12.2583099⟩. ⟨hal-03236906⟩