Combination bulk absorber-honeycomb acoustic panels

Details Combination bulk absorber-honeycomb acoustic panels Combination bulk absorber-honeycomb acoustic panels

1978-11-20

1980-11-25

Hix, L. T.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181222, 181286, 181292, B64D 3302, E04B 1100

Patent

active

042353033

ABSTRACT:
Combination bulk absorber-honeycomb acoustic panels particularly adapted for use in the inlet and fan air duct of a fan jet engine are disclosed. Each panel comprises a broadband noise-suppressing bulk absorber layer mounted between a back sheet and a perforated septum; and, a narrow band noise-suppressing honeycomb layer mounted between the septum and a perforated face sheet. The panels are mounted in an engine such that the perforated face sheet interfaces with airflow in the inlet or the fan air duct, as the case may be, whereby the face sheet, honeycomb layer and septum protect the bulk absorber from deterioration by isolating the high speed inlet and fan air duct airflows from the bulk absorber layer.

REFERENCES:
patent: 2826261 (1958-03-01), Eckel
patent: 3166149 (1965-01-01), Hulse et al.
patent: 4084367 (1978-04-01), Saylor et al.
patent: 4111081 (1978-09-01), Hilliard et al.
patent: 4130175 (1978-12-01), Hehmann
patent: 4137992 (1979-02-01), Herman

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