Stock material or miscellaneous articles – Structurally defined web or sheet – Honeycomb-like
Patent
1979-12-21
1983-12-20
Gallagher, John J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Honeycomb-like
52794, 52808, 156182, 156249, 156280, 156292, 1563075, 1563077, 156315, 156327, 181286, 181292, 428193, B32B 312, E04B 182
Patent
active
044218117
ABSTRACT:
A method of manufacturing 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 dissimilar materials.
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Riel Frank J.
Rose Philip M.
Gallagher John J.
Gilliam Frank D.
Rohr Industries, Inc.
Schlesinger Patrick J.
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