Rigid sandwich panel acoustic treatment
AssigneeGeneral Electric Company
InventorsRobert E. Kraft, Asif A. Syed
Life of this patent
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Abstract
An acoustic treatment for the air ducts of a gas turbine engine. The acoustic treatment generally includes a facesheet having a plurality of holes therein, a backplate spaced apart from the facesheet, and a plurality of interconnected cells between the facesheet and backplate. Each of the cells is defined by walls attached to the facesheet and the backplate, and at least some of the walls are formed of a porous material so that air is able to flow through the cells in a direction parallel to the facesheet and backplate.
Claims17
An acoustic treatment panel comprising:
- a facesheet having a plurality of holes therein but otherwise being air-impermeable;
- an air-impermeable backplate spaced apart from the facesheet;
- and
- a plurality of interconnected cells between the facesheet and backplate, each of the cells being defined by walls attached to the facesheet and the backplate, at least some of the walls being entirely porous and air-permeable to provide steady flow resistance therethrough of about 20 to about 120 CGS Rayl and allow acoustic propagation parallel to the facesheet through the cells.
An acoustic treatment panel comprising:
- a facesheet having a plurality of holes therein but otherwise being air-impermeable;
- an air-impermeable backplate spaced apart from the facesheet, the backplate being mounted to an aircraft engine duct;
- a plurality of interconnected unfilled cells between the facesheet and backplate, the cells being in fluidic communication with the holes in the facesheet, each of the cells being defined by walls attached to the facesheet and the backplate, at least some of the walls being entirely porous and air-permeable to provide steady flow resistance therethrough of about 20 to about 120 CGS Rayl and allow acoustic propagation parallel to the facesheet through the cells;
- and
- an air-impermeable partition wall between and attached to the facesheet and backplate, the partition wall surrounding a plurality of the cells.
An acoustic treatment panel comprising:
- a facesheet having a plurality of holes therein but otherwise being air-impermeable;
- an air-impermeable backplate spaced apart from the facesheet, the backplate being mounted to an aircraft engine duct;
- a plurality of interconnected honeycomb-shaped unfilled cells between the facesheet and backplate, each of the cells being in fluidic communication with at least one of the holes in the facesheet, each of the cells being defined by walls attached to the facesheet and the backplate, each of the walls being entirely formed of a composite material that is porous and air-permeable to provide steady flow resistance therethrough of about 20 to about 120 CGS Rayl and allow acoustic propagation parallel to the facesheet through the cells;
- and
- a plurality of air-impermeable partition walls between and attached to the facesheet and backplate the partition walls defining a rectangular grid of partitions each of the partitions surrounding a plurality of the cells.
Dependencies are inferred from the claim text.