Zeno duct sound attenuating means

Details Zeno duct sound attenuating means Zeno duct sound attenuating means

1981-05-26

1983-06-14

Hix, L. T.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181248, 181252, F01N 104

Patent

active

RE0312754

ABSTRACT:
A broadband sound attenuating, acoustically lined, duct of varying cross-sectional shape but in the usual case having a constant cross-sectional area, and wherein the duct liner is configured to maintain an essentially constant acoustic resistance and scaled acoustic reactance throughout provided by means of changes in the effective depth of the liner. Design tradeoffs permit some variation in the cross-sectional area of the duct with concomitant changes in liner properties. In all cases, the duct is designed so that every section along its major axis is optimally tuned to absorb most efficiently some part of the frequency spectrum of interest. The device is particularly suitable for sound suppression of jet aircraft engines.

REFERENCES:
patent: 3511336 (1970-05-01), Rink et al.
patent: 3542152 (1970-11-01), Adamson et al.
patent: 3685611 (1972-08-01), Duvvuri
patent: 3905445 (1975-09-01), Scharkon

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