Title: Acoustic duct with peripherally segmented acoustic treatment

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.

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Inventors: Mani, Ramani (Scotia, NY, US)

Application Number: 503031
Filing Date: 1974-09-03
Publication_date: 1976-02-10
Assignee: General Electric Company (Schenectady, NY)
Primary Class(es): 415/119 137/15.1, 181/207
Other Classes:
US Patent Ref:

3263771	Aug, 1966	Seifert	181/42.
3508838	Apr, 1970	Martenson	181/33.
3620329	Nov, 1971	Wenzlaff	181/33.
3819008	Jun, 1974	Evans et al.	181/33.
3830335	Aug, 1974	Zorumski	181/33.
3848697	Nov, 1974	Jannot et al.	181/33.

Other Refs:
Primary Examiner: Gonzales, John F.
Assistant Examiner:
Attorney: Campbell; Donald R., Cohen; Joseph T., Squillaro; Jerome C.