Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1995-05-08
1997-07-22
Dang, Khanh
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181224, 181264, 181268, B64F 126
Patent
active
056505990
ABSTRACT:
A method and apparatus for reducing noise originating in a flowing stream of gases in which the noise is progressively absorbed from the flowing stream to provide noise of reduced intensity relative to noise intensity at the upstream end of the stream, and the noise of reduced intensity actively attenuated with controlled sound energy. To facilitate the active attenuation of noise, the flowing stream is preferably divided into a plurality of smaller streams after a level of reduced intensities is attained and the active attenuation performed independently in each of the smaller streams. The apparatus is in the nature of a conduit (10) which defines a single duct extending from the inlet end (14) for a portion of the length of the conduit. Downstream, the single duct joins with a plurality of ducts (32,34) extending to the outlet end (16). An active noise attenuating device is preferably provided in each of the plurality of ducts.
REFERENCES:
patent: 3033307 (1962-05-01), Sanders et al.
patent: 3187835 (1965-06-01), Smith
patent: 4122912 (1978-10-01), Lepor
patent: 4287962 (1981-09-01), Ingard et al.
Fedun Basil
Johnson Michael P.
Madden Peter E.
Turner Paul N.
Dang Khanh
Northrop Grumman Corporation
Sutcliff Walter G.
LandOfFree
Noise cancellation method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Noise cancellation method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise cancellation method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1561186