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Background acoustics levels in the 9x15 wind tunnel and linear array testing
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Stephens, David |
| Copyright Year | 2011 |
| Description | 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. |
| File Size | 1401122 |
| Page Count | 29 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150010167 |
| Archival Resource Key | ark:/13960/t4mm19t9w |
| Language | English |
| Publisher Date | 2011-10-18 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Flow Noise Phased Arrays Acoustic Measurement Noise Reduction Wind Tunnel Tests Signal Processing Sound Intensity Linear Arrays Pressure Measurement Low Speed Wind Tunnels Background Noise Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Presentation |
