Abstract
A theory is given for acoustic attenuation in ducts lined on two opposite sides with porous sound-absorbing material incorporating perforated facings, in the presence of uniform flow. Theoretical calculations are compared to measurements by the author, and to experimental data in the literature. Some emphasis in the discussion is placed on three-dimensional higher order modes of propagation. The application of the model to splitter type silencers is discussed, and design curves for duct linings are given.
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