Sound absorbing panel

Details Sound absorbing panel Sound absorbing panel

1986-05-01

1987-05-26

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Sound absorbing panels

181292, F04B 182

Patent

active

046677682

ABSTRACT:
In the present invention an improved sound absorbing panel is provided. The panel comprises an array of wall defining means configured to provide two or more contiguous hollow cells having adjacent open ends and adjacent closed impermeable ends, the open ends defining a sound receiving end of the array, at least one impermeable three dimensional closed surface disposed in at least one of the cells, and a flow resistive permeable facing sheet covering the sound receiving end. Approximately 50 percent of the cells may be filled in a periodic arrangement. The three dimensional closed surface may be a sphere or a cylinder and may be bonded to the closed impermeable ends or to the wall defining means. A drainage notch is provided. The present invention is particularly suitable for sound attenuation in jet engines and other applications having adverse environmental conditions and requiring sound absorptive panels, baffles, duct liners, and duct splitters.

REFERENCES:
patent: 3734234 (1973-05-01), Wirt
patent: 3831710 (1974-08-01), Wirt
patent: 4441578 (1984-04-01), Rose
patent: 4560028 (1985-12-01), Perret

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