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Enhancement of a passive acoustic liner by active control of intensity

Minotti, Angelot and Pommier-Budinger, Valérie and Bordeneuve-Guibé, Joël and Simon, Frank Enhancement of a passive acoustic liner by active control of intensity. (2007) In: Inter-Noise , 28-31 Aug 2007, Istanbul, Turkey .

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Official URL: http://www.internoise2007.org.tr/

Abstract

Classically, passive acoustic liners, used in aeronautic engine nacelles, have a Quarterwavelength behavior, thanks to perforated sheets backed to honeycombs. So, their absorption is obtained on a narrow frequency band. To carry out an active control process can improve the absorption of liners at lower frequencies. In [1-3], a quarter-wavelength liner with a vibrating back plate was realized and active minimization of local acoustic pressure was led. Presently, an active control of the instantaneous acoustic intensity (thanks to two microphones) downstream from a quarter-wavelength liner is suggested: If a source of noise is located upstream, minimizing this signal is equivalent to maximizing the energy transmitted into the liner. So its absorption is improved. This method is independent from the theoretical model of the passive behavior. The experimental setup is close to [1-3], i.e. harmonic incident plane waves and liner flush mounted to a duct. Measurements of insertion and trans-mission losses are led on an ONERA test bench with active control of intensity based on FXLMS algorithm, in the near and far fields of the liner. Results are analyzed and compared with passive performance.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA
Laboratory name:
Département de Mathématiques, Informatique, Automatique - DMIA (Toulouse, France) - Automatique, Dynamique et Interface des Systèmes - ADIS
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Deposited By: valerie budinger
Deposited On:15 Jan 2009 13:43

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