Acoustic duct with peripherally segmented acoustic treatment

Details Acoustic duct with peripherally segmented acoustic treatment Acoustic duct with peripherally segmented acoustic treatment

1974-09-03

1976-02-10

Gonzales, John F.

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

137 151, 181 33HA, 181 42, F04D 2966

Patent

active

039375900

ABSTRACT:
An acoustic duct such as a jet engine fan duct is lined with numerous peripherally spaced, longitudinally extending strips of sound-absorbing material which are effective to scatter spinning mode acoustic pressure fields to higher order, attenuating modes for improved noise suppression. These strips can be alternated with other strips having a different acoustical impedance, or combined with a longitudinally segmented treatment.

REFERENCES:
patent: 3263771 (1966-08-01), Seifert
patent: 3508838 (1970-04-01), Martenson
patent: 3620329 (1971-11-01), Wenzlaff
patent: 3819008 (1974-06-01), Evans et al.
patent: 3830335 (1974-08-01), Zorumski
patent: 3848697 (1974-11-01), Jannot et al.

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