Multi-layer acoustic linings

Details Multi-layer acoustic linings Multi-layer acoustic linings

1979-11-06

1981-11-03

Hix, L. T.

Acoustics

Sound-modifying means

Sound absorbing panels

181292, E04B 182

Patent

active

042980909

ABSTRACT:
A multi-layer acoustic lining, e.g. for a flow duct in a gas turbine aeroengine, includes Helmholtz-type and tube-type resonators sandwiched between backing and facing sheets. In the invention, the ends of the tube-type resonators abut the Helmholtz resonators but are acoustically divided from them by partition means in such a way that the tube-type resonators differ from each other in resonant frequency. Variation of resonant frequency in the tube-type resonators is achieved by variation of their lengths according to which portion of the partition means acoustically divides them from the Helmholtz-type resonators, the partition means being arranged either step-wise or inclinedly between the backing and facing sheets.

REFERENCES:
patent: 3640357 (1972-02-01), Kitching et al.
patent: 3819009 (1974-06-01), Motsinger
patent: 3831710 (1974-08-01), Wirt
patent: 3913702 (1975-10-01), Wirt et al.
patent: 4150732 (1979-04-01), Hoch et al.
NASA, "Acoustic Treatment Development and Design", by Art Clemons, May 1979, pp. 169 and 171.

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