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Reduction of sound in a low velocity flow duct by the use of Bragg reflections

โœ Scribed by B. Sommersel; U.R. Kristiansen

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
324 KB
Volume
9
Category
Article
ISSN
0003-682X

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โœฆ Synopsis

This paper presents the results of some experiments on the use of structures of aerodynamically-shaped elements as narrow-band sound reflectors in a duct. The structures are tuned to give maximum attenuation for frequencies determined by the Bragg reflection condition, and are thought to be of special value where space considerations prohibit the use of conventional acoustic wave filters.

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An approximate method for calculating the noise generated by a turbulent #ow within a semi-in"nite duct of arbitrary cross-section is developed. It is based on a previously derived high-frequency solution to Lilley's equation, which describes the sound propagation in a transversely sheared mean #ow.