Encapsulated bulk absorber acoustic treatments for aircraft engi

Details Encapsulated bulk absorber acoustic treatments for aircraft engi Encapsulated bulk absorber acoustic treatments for aircraft engi

1982-07-19

1984-04-10

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181288, 181290, F01N 124

Patent

active

044415788

ABSTRACT:
A sandwich type acoustical absorbing panel for use adjacent to high speed gas flow areas in and around the engines of high speed aircraft. The panel in one embodiment comprises an imperforate facing sheet including having upright side and end walls, the inner volume of the panel and upright side and end walls are divided by means of partitions into a plurality of individual cavities or cells, each of the plurality of individual cavities or cells are filled with a bulk absorber material having many small torturous air passages, such as, open celled foam, fiberglass, felts or the like, the bulk absorber filling each cavity or cell is encapsulated in a membrane of thin limp material for preventing bulk absorber contamination and a perforated sheet overlay for attaching to the side, end walls and partitions for containing the bulk absorber within the cavities or cells.

REFERENCES:
patent: 3095943 (1963-07-01), Kemp
patent: 4001473 (1977-01-01), Cook
patent: 4174020 (1979-11-01), Challis
patent: 4194329 (1980-03-01), Wendt

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