The propagation of low-frequency sound in a two-dimensional duct system with T joints and right angle bends: Theory and experiment
Technisch Physische Dienst TNO - TH
The method of matched asymptotic expansion is used to determine a low-frequency approximation of the acoustic pressure in a waveguide system with a T joint. The low-frequency approximation is compared with (a) experimental data of Lippert [Acustica 4, 313-319 (1954)]; (b) new experimental data; and (c) the first approximation of the mode expansion proposed by Miles [J. Acoust. Soc. Am. 17, 259-272 (1946)]. In this article, the propagation of low-frequency sound in a two-dimensional duct system with bends and T joints is investigated for the case of zero mean flow. In particular, the reflection and transmission of plane waves incident on a T joint will be considered.
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Acoustical Society of America JASA
Journal of the Acoustical Society of America, 82 (3), 1045-1051