Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1979-12-17
1981-10-13
Hix, L. T.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181286, 181292, E04B 182, F01N 124
Patent
active
042943299
ABSTRACT:
A double degree acoustic attenuation sandwich panel having a plurality of stacked components adhered together to form a unitary sandwich structure. The structure comprising an impervious facing of thin sheet material, a first honeycomb core with end wise directed cells, a first perforate facing of thin sheet material, a first thin layer of porous fibrous material, a second perforated facing of thin sheet material, a second honeycomb core with end wise directed cells, a third perforate facing of thin sheet material, the second perforated facing sheet having substantially larger perforations than the first and third sheets, and a second layer of porous fibrous material. The resulting sandwich panel has a pre-determined flow through resistance between the outer surface of the first and second layers of porous fibrous material and the cells of the first and second honeycomb cores. The cells of the first and second honeycomb cores may be of equal or different volume and may be constructed of similar or dis-similar materials.
REFERENCES:
patent: 2870857 (1959-01-01), Goldstein
patent: 3166149 (1965-01-01), Hulse et al.
patent: 3819009 (1974-06-01), Motsinger
patent: 3948346 (1976-04-01), Schindler
patent: 3977492 (1976-08-01), Hawkel
patent: 4084366 (1978-04-01), Saylor et al.
Riel Frank J.
Rose Philip M.
Fuller Benjamin R.
Gilliam Frank D.
Hix L. T,.
Rohr Industries, Inc.
Schlesinger Patrick J.
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