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Improvement Of The Helmholtz AbsorberHelmholtz-resonator system improved to enable it to absorb sound at more than one frequency without appreciable loss of effectiveness at primary frequency. Addition of annular cavities enables absorption of sound at harmonic frequencies in addition to primary frequency. Improved absorber designed for use on structures of high transmission loss. Applied to such machines as fixed-speed engines and fans.
Document ID
19920000702
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Morrow, Duane L.
(Lockheed Corp.)
Date Acquired
August 15, 2013
Publication Date
November 1, 1992
Publication Information
Publication: NASA Tech Briefs
Volume: 16
Issue: 11
ISSN: 0145-319X
Subject Category
Mechanics
Report/Patent Number
LAR-14222
Accession Number
92B10702
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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