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Acoustical properties of materials and muffler configurations for the 80 by 120 foot wind tunnel

Author
Scharton, T. D.
Published
Aug 25, 1977.
Physical Description
1 electronic document
Additional Creators
Sneddon, M. D.
Online Version

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Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
Techniques for measuring the impedance of the muffler configurations and of porous plates with grazing flow were investigated and changes in the configuration parameters to enhance acoustic performance are explored. The feasibility of a pulse reflection technique for measuring the impedance of built-up structures in situ was demonstrated. A second technique involving the use of an open-end impedance tube with grazing flow was used to obtain detailed design data for the perforated plate configuration. Acoustic benefits associated with configuration changes such as curving the baffles, spacing and staggering baffle partitions, and techniques for alleviating baffle self-generated noise are described.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19780002173.
Accession ID: 78N10116.
NASA-CR-152065.
REPT-3563.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15730836