Composite material with acoustic absorption properties

Details Composite material with acoustic absorption properties Composite material with acoustic absorption properties

1975-02-25

1976-04-27

Franklin, Lawrence R.

Acoustics

Auditorium

E04B 174

Patent

active

039528316

ABSTRACT:
A composite material with acoustic absorption properties of the "sandwich" ype has a core of cellular structure between two skins substantially parallel one of which is cut-out by orifices while the other is devoid of orifices. The core is composed of a plurality of cells each of which extends from one skin to the other. A plurality of small plates, of material with high acoustic resistivity, are inserted into the cellular structure. Each plate has an active part contained in a plane substantially parallel to the skins, so that the active parts form, together, the equivalent of an intermediary wall of high acoustic resistivity dividing the cellular structure into two superposed layers each formed by a mass of sub-cells.

REFERENCES:
patent: 1754784 (1930-04-01), Borsodi
patent: 2039601 (1936-05-01), London
patent: 3237714 (1966-03-01), Surine
patent: 3353626 (1967-11-01), Cremer et al.
patent: 3734234 (1973-05-01), Wirt
patent: 3769767 (1973-11-01), Scott
patent: 3831710 (1974-08-01), Wirt

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