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MATHEMATICAL ANALYSIS OF THE ACOUSTIC DIFFRACTION BY A MUFFLER CONTAINING PERFORATED DUCTS

A. S. BONNET-BEN DHIA

ENSTA, POems, UMR 27 06 CNRS-INRIA-ENSTA, 32 Boulevard Victor 75739 Paris, Cedex 15, France

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D. DRISSI

ENIT-LAMSIN, Campus Universitaire, B.P. 37, 1002 Tunis, Tunisia

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, and

N. GMATI

ENIT-LAMSIN, Campus Universitaire, B.P. 37, 1002 Tunis, Tunisia

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https://doi.org/10.1142/S0218202505000649Cited by:13 (Source: Crossref)

Abstract

We consider the three-dimensional scalar problem of acoustic propagation in a muffler. We develop and analyze a Fredholm-type formulation for a stationary fluid in the time-harmonic setting. We prove a homogenization result for a muffler containing periodically perforated ducts. Essentially, the perforated boundaries become completely transparent when the period of perforations, which is assumed to be of the same order as the size of perforations, tends to zero. We also derive a homogenized impedance condition when the perforated duct is coated by an absorbing material. We present numerical examples in two dimensions, obtained from coupling finite elements in the muffler with modal decompositions in the inlet and outlet ducts, which demonstrate the limiting validity of the theoretical results.

Keywords:

AMSC: 65, 74Q, 74S, 74J

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