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Development of Quiet Honeycomb PanelsSandwich honeycomb composite panels are lightweight and strong, and, therefore, provide a reasonable alternative to the aluminum ring framelstringer architecture currently used for most aircraft airframes. The drawback to honeycomb panels is that they radiate noise into the aircraft cabin very efficiently provoking the need for additional sound treatment which adds weight and reduces the material's cost advantage. A series of honeycomb panels were made which incorporated different design strategies aimed at reducing the honeycomb panels' radiation efficiency while at the same time maintaining its strength. The majority of the desi gns were centered around the concept of creatin g areas of reduced stiffness in the panel by adding voids and recesses to the core. The effort culminated with a reinforced./recessed panel which had 6 dB higher transmission loss than the baseline solid core panel while maintaining comparable strength.
Document ID
20090042975
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Palumbo, Daniel L. (NASA Langley Research Center Hampton, VA, United States)
Klos, Jacob (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 24, 2013
Publication Date
December 1, 2009
Subject Category
Acoustics
Report/Patent Number
LF99-9714
L-19785
NASA/TM-2009-215954
Funding Number(s)
WBS: WBS 561581.02.08.07.18.02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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