Acoustic Liners Behavior Investigation Using the Multimodal Scattering Matrix
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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