Multi-layer acoustic linings

Details Multi-layer acoustic linings Multi-layer acoustic linings

1979-03-20

1980-11-04

Griffin, Donald A.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181286, 181292, 181293, 181294, E04B 182

Patent

active

042314470

ABSTRACT:
A multi-layer acoustic lining is of the type having core compartments rendered effective as Helmholtz resonators by means of resonator necks projecting from the core facing layer into the core compartments. In order to broaden the frequency response, those ends of the resonator necks which project into the core compartments are bevelled so as to give the necks a less well defined length. The acoustic lining is particularly for application to the jet pipe or fan duct of a turbofan aeroengine.

REFERENCES:
patent: 3819007 (1974-06-01), Wirk et al.
patent: 3913702 (1975-10-01), Wirt et al.
patent: 3991848 (1976-11-01), Davis
patent: 4100993 (1978-07-01), Feder
patent: 4135603 (1979-01-01), Dean et al.
patent: 4150732 (1979-04-01), Hoch et al.
patent: 4158401 (1979-06-01), Matsumoto et al.

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