Abstract
This paper presents an analytical investigation of higher order mode propagation in a nonuniform duct without mean flow. An approximate wave equation is derived on the assumptions that the duct cross section varies slowly and that mode conversion is negligible. Closed-form solutions are obtained for a particular class of converging-di verging duct which is here referred to as circular cosh Numerical results are presented in terms of the transmission loss for the various duct shapes and frequencies. The results are applicable to studies of multimodal propagation as well as single-mode propagation. The results are also applicable to studies of sound radiation from certain types of contoured inlet ducts, or of sound propagation in a converging-diverging duct of somewhat different shape from a cosh duct. b0 b(x) b _ , b +
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