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Acoustic Liners Behavior Investigation Using the Multimodal Scattering Matrix

M. Taktak(1*), J. M. Ville(2), M. Haddar(3), G. Gabard(4), F. Foucart(5)

(1) Laboratoire Roberval FRE UTC-CNRS n°2833, Université de Technologie de Compiègne, France
(2) Laboratoire Roberval FRE UTC-CNRS n°2833, Université de Technologie de Compiègne, France
(3) Unité de Mécanique, Modélisation et Productique (U2MP), Département de Génie Mécanique, Ecole Nationale d’Ingénieurs de Sfax, Tunisia
(4) Institute of Sound and Vibration Research, University of Southampton, United Kingdom
(5) Laboratoire Roberval FRE UTC-CNRS n°2833, Université de Technologie de Compiègne, France
(*) Corresponding author


DOI: https://doi.org/10.15866/irease.v8i6.8822

Abstract


In this paper, the acoustic behavior of Helmholtz’s resonator type liner used in aeronautics applications is presented. The aim of this work is to study how the liner properties can be modified by the mounting conditions on the wall of a cylindrical duct element. To achieve this objective the measured multi-port scattering matrix, power acoustic dissipations are compared with results performed by FEM assuming axi-symmetry and a uniform and locally reacting material which impedance is measured or resulting from a model. Results show that in plane wave conditions the agreement between experiment and theory is satisfying but that a large discrepancy occurs when higher order mode is incident on the liner element pointing out a modification of the acoustic properties of the lined wall.
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Keywords


Locally Reacting Liner; Scattering Matrix; Acoustic Power Dissipation

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References


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