Honeycomb noise attenuation structure
AssigneeRohr Industries, Inc.
InventorsStanley L. Beggs, Frank J. Riel, Dale W. R. Lawson
Life of this patent
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Abstract
Broad band noise attenuation sandwich panels utilizing a cellular core positioned between and bonded to two facing sheets by an adhesive bonding system. One facing sheet is perforated and the other imperforate. A thin sheet of porous fibrous felt or fabric is bonded to the outer surface of the perforate sheet. The adhesive layer, at least between the perforate sheet and the porous fibrous material, is sufficiently thick to isolate the two components and form a funnel shaped opening necked down at the entrance to each perforation.
Claims18
The honeycomb sandwiched attentuation panel for use adjacent a high velocity gas flow area comprising:
- (a) a honeycomb core having a multiplicity of cells defined by substantially parallel walls of thin sheet material and having a pair of core faces;
- (b) a perforated facing sheet of end sheet material having on a surface thereat bonded to one said core face;
- (c) an imperforate facing sheet of thin sheet material bonded to the other said core face;
- (d) a thin sheet of porous fibrous material;
- and
- (e) an electrically insulating bonding medium isolating said thin sheet of porous fibrous material from said perforated facing sheet and bonded to said porous fibrous material and the other surface of said perforated facing sheet, wherein the bonding medium insulates said thin sheet of said porous fibrous material from said perforated facing sheet, the pores of said porous fibrous material providing a predetermined impeded communication between the core cells and the atmosphere through the open perforations of said perforated sheet.
Dependencies are inferred from the claim text.