Broad band acoustic attenuator

Details Broad band acoustic attenuator Broad band acoustic attenuator

1979-07-31

1981-01-13

Miller, Jr., George H.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181296, 60262, F01N 100, F02K 100

Patent

active

042444411

ABSTRACT:
A broad band acoustic attenuator particularly useful for attenuating gas turbine engine noise utilizes a plurality of axially extending, open-ended, perforated cylinders concentrically arranged within the exhaust duct of the gas turbine engine for attenuating noise therefrom without imposing significant back pressure penalties.

REFERENCES:
patent: 2844001 (1958-07-01), Alford
patent: 2988302 (1961-06-01), Smith
patent: 3215172 (1965-11-01), Ardoin
patent: 3437173 (1969-04-01), Ehrich
patent: 3848697 (1974-11-01), Jannot et al.
patent: 3905445 (1975-09-01), Schaoton
Winston E. Kock, "Sound Waves and Light Waves," Doubleday & Co., 1965, pp. 42-47, 66-68 and 99-102.
Air Force Report AFAPL-TR-76-65-vol. I, "The Generation and Radiation of Supersonic Jet Noise," 1976, p. 82.
Leo L. Beranek, ed., "Noise Reduction," McGraw-Hill, 1969, p. 681.
Sound and Vibrations Magazine, 1974, pp. 30-34.

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