✦ LIBER ✦

ACTIVE CONTROL OF SOURCE SOUND POWER RADIATION IN UNIFORM FLOW

✍ Scribed by P. Joseph; C.L. Morfey; P.A. Nelson

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 169 KB
Volume: 212
Category: Article
ISSN: 0022-460X
DOI: 10.1006/jsvi.1997.1461

No coin nor oath required. For personal study only.

✦ Synopsis

Many suggested applications of active noise control involve the presence of a background air flow such as in ventilation ducts, exhaust stacks and the radiation from turbofan engines. This paper is a theoretical study aimed at assessing the effect of a uniform flow on the ability of simple sources actively to control free field sound power radiation. In particular, the minimum sound power radiated by two point volume velocity sources situated in an unbounded uniform fluid which moves with a uniform steady velocity is determined. Also the maximum sound power that can be absorbed by a point volume velocity source from an incident plane wave is determined.

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The active noise control of a moving source such as airplanes landing or taking o!, trains, cars... cannot be achieved directly by using today's classical control of an immobile source. The method described here consists in installing a secondary source screen in the vicinity of the controlled domai