Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1979-12-21
1983-02-01
Hix, L. T.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181255, 181272, 181273, F01N 110
Patent
active
043710549
ABSTRACT:
An acoustical silencer for a gas passage or exhaust duct for a gas turbine engine, which is composed of three parts. The first comprises an absorptive surface to absorb incident low frequency sound the second comprises an acoustically lined duct attenuating high frequency sound transmitted therethrough. The entrance to the first part and the entrance to the second part are essentially coplanar. The third part is a horn-shaped plenum or conical diffuser to contain the flow and distribute the sound over the entry surface of the first part and the entrance to the second part. The entrances to both the first and second parts, being coplanar, present acoustically parallel paths to sound impinging on their common plane. The input impedances of the absorptive surface of the first part and the entrance to the second part are adjusted such that a disproportionately larger share of the incident low frequency acoustical energy passes into the first part and is dissipated. At higher frequencies, an area proportionate share of incident acoustical energy may be absorbed by the first part and the remainder which enters the second part is attenuated by the lined duct portion of the second part.
REFERENCES:
patent: 1878424 (1932-09-01), Oldberg
patent: 2998860 (1961-09-01), Everett
patent: 3033307 (1962-05-01), Sanders et al.
patent: 3142354 (1964-07-01), Kammerer et al.
patent: 3590946 (1971-07-01), Corn, Jr.
patent: 3920095 (1975-11-01), Clark
Fuller Benjamin R.
Hix L. T,.
Lockheed Corporation
Smith Frederic P.
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