Actions for Background Acoustics Levels in the 9x15 Wind Tunnel and Linear Array Testing

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Background Acoustics Levels in the 9x15 Wind Tunnel and Linear Array Testing

Author
Stephens, David
Published
October 18, 2011.
Physical Description
1 electronic document
Online Version

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Summary
The background noise level in the 9x15 foot wind tunnel at NASA Glenn has been documented, and the results compare favorably with historical measurements. A study of recessed microphone mounting techniques was also conducted, and a recessed cavity with a micronic wire mesh screen reduces hydrodynamic noise by around 10 dB. A three-microphone signal processing technique can provide additional benefit, rejecting up to 15 dB of noise contamination at some frequencies. The screen and cavity system offers considerable benefit to test efficiency, although there are additional calibration requirements.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20150010167.
E-661236.
NASA Acoustics Technical Working Group; 18-19 Oct. 2011; Hampton, VA; United States.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15413482