Acoustic treatment for fans

Details Acoustic treatment for fans Acoustic treatment for fans

1979-06-15

1981-07-21

Griffin, Donald A.

Acoustics

Sound-modifying means

Combined

181222, 181225, 181286, 181292, F01N 104, E04B 182

Patent

active

042793254

ABSTRACT:
Apparatus for attentuating noise emitted from an inlet port to a centrifugal fan comprises a panel member which is mounted in spaced confronting relationship to the inlet port and includes a rigid backing member, a facing mounted in spaced disposition from the rigid backing member, partitions dividing the space between the rigid backing member and the facing into a plurality of cavities, and acoustic infill in the cavities. The facing has a plurality of perforation zones, and is formed in each perforation zone with small perforations whereby the facing is rendered acoustically permeable over a limited area only. One wall of each cavity includes a perforation zone of the facing, whereby the cavities constitute Helmholtz absorption cavities. The facing is adapted to face the inlet port and transmit noise for attenuation in the cavities.

REFERENCES:
patent: 3380552 (1968-04-01), Segil et al.
patent: 3485443 (1969-12-01), Earhart
patent: 3980912 (1976-09-01), Panza
patent: 4001473 (1977-01-01), Cook

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