Now showing items 1-3 of 3
Effect of an expansion chamber on the propagation of sound in circular ducts
(American Institute of Physics, 1978-03-01)
The present analysis reveals that the performance of an expansion chamber is greatly affected by the expansion ratio, the sound frequency and to a lesser extent the chamber length. This conclusion was verified experimentally. ...
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 ...