초록 ▼

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 t

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.

대표청구항 ▼

A double layer acoustical honeycomb sandwich panel having structural strength for use in the severe environment in and around high velocity fluid flow paths associated with aircraft gas turbine engines comprising: first and second honeycomb cores having a multiplicity of endwise directed cells with

A double layer acoustical honeycomb sandwich panel having structural strength for use in the severe environment in and around high velocity fluid flow paths associated with aircraft gas turbine engines comprising: first and second honeycomb cores having a multiplicity of endwise directed cells with walls of thin sheet material disposed transversely to the panel; an impervious facing of thin sheet material; first, second and third facings of perforated thin sheet material; and first and second thin sheets of porous fibrous material; said impervious facing of this sheet material is adhesively bonded to one end wise cell face of said first honeycomb core; said first perforated facing of thin sheet material is adhesively bonded to said first honeycomb core on the surface opposite said impervious facing of this sheet material; said first thin sheet of porous fibrous material is adhesively bonded to the other surface of said first perforated facing of thin sheet material; said third facing of perforated thin sheet material is adhesively bonded between one end wise cell surface of said second honeycomb core and to the other surface of said first thin sheet of porous fibrous material; said second perforated facing of thin sheet material is adhesively bonded to the opposite surface of said second honeycomb core; said second thin sheet of porous fibrous material is adhesively bonded to the opposite surface of said second perforated facing of this sheet material whereby a smooth outer surface is presented to a high velocity fluid flow.