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Noise measurements for single and multiple operation of 50 kw wind turbine generators
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Shepherd, K. P. Hubbard, H. H. |
| Copyright Year | 1982 |
| Description | The noise characteristics of the U.S. Windpower Inc., 50 kw wind turbine generator were measured at various distances from 30 m to 1100 m and for a range of output power. The generated noise is affected by the aerodynamic wakes of the tower legs at frequencies below about 120 Hz and the blade trailing edge thickness at frequencies of about 2 kHz. Rope strakes and airfoil fairings on the legs did not result in substantial noise reductions. Sharpening the blade trailing edges near the tip was effective in reducing broad band noise near 2 kHz. For multiple machines the sound fields are superposed. A three-fold increase in number of machines (from 1 to 3) results in a predicted increase in he sound pressure level of about 5 dB. The detection threshold for 14 machines operating in a 13 - 20 mph wind is observed to be at approximately 1160 m in the downwind direction. |
| File Size | 1099085 |
| Page Count | 27 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19830008965 |
| Archival Resource Key | ark:/13960/t43r5pq3f |
| Language | English |
| Publisher Date | 1982-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Towers Blade Tips Strakes Turbine Blades Broadband Noise Reduction Noise Measurement Sound Pressure Sound Fields Trailing Edges Wakes Wind Turbines Detection Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
