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Sound propagation in duct shear layers

โœ Scribed by P.N. Shankar


Publisher
Elsevier Science
Year
1972
Tongue
English
Weight
832 KB
Volume
22
Category
Article
ISSN
0022-460X

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๐Ÿ“œ SIMILAR VOLUMES


ON SOUND PROPAGATION IN A LINEAR SHEAR F
โœ L.M.B.C. Campos; J.M.G.S. Oliveira; M.H. Kobayashi ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 281 KB

It is shown that the acoustic wave equation in a linear shear flow always has a critical layer, where the Doppler shifted frequency vanishes; since this is the only singularity of the wave equation apart from the point at infinity, the power series solution about the critical layer has infinite radi

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The theory of sound refraction by shear layers, established two decades ago, is revisited from the viewpoint of sound-vortex interaction: vortical waves are generated by sound on the duct rigid wall through viscosity, and these acoustically created vortical waves in turn serve as a source of sound.

SOUND PROPAGATION IN CIRCULAR DUCTS LINE
โœ Y.J. KANG; I.H. JUNG ๐Ÿ“‚ Article ๐Ÿ“… 2001 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 329 KB

Finite element predictions and corresponding measurements for sound attenuation and phase speed in a circular duct lined with poroelastic noise control foams are presented in this article. In the present study, four con"gurations having di!erent lining thickness are considered for three types of foa