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Influence of anisotropic liners on the attenuation of sound in circular ducts
(Acoustical Society of America, 1976)
An analysis is presented of the sound propagation and attenuation in a circular duct carrying a uniform mean flow and lined with an anisotropicporous material backed by cellular cavities. A combination of a fourth-order ...
A geometric acoustics approach to the study of sound propagation in ducts containing sheared flows
(Acoustical Society of America, 1979-12-01)
Geometric acoustics has been used to study the propagation of sound waves in a homogeneous moving medium with sheared flow bounded by the hard walls of a duct. Differential equations describing the ray trajectories and the ...