Acoustic liner

Details Acoustic liner Acoustic liner

1989-06-26

1990-11-13

Fuller, B. R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181214, 181222, 181286, 181288, 181292, B64D 3302, F01N 102, F02K 100

Patent

active

049695355

ABSTRACT:
An acoustic liner comprising a sound permeable inside plate forming a first closed annulus, and a sound impermeable outside plate forming a second closed annulus located outside of and extending around the first closed annulus. The inside and outside plates are spaced apart and thus form an annular chamber therebetween; and a core member is secured in this annular chamber, between the inside and outside plates. The core member forms or has the shape of a sine wave form annularly extending around the inside plate, and the core member and the inside plate form a multitude of varying depth sound absorption chambers to attenuate sound waves over a broad band of frequencies.

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