| タイトル | Reduction of high-speed impulsive noise by blade planform modification of a model helicopter rotor |
| 本文（外部サイト） | http://hdl.handle.net/2060/19830007880 |
| 著者（英） | Hoad, D. R.; Conner, D. A. |
| 著者所属（英） | NASA Langley Research Center|Army Aviation Research and Development Command |
| 発行日 | 1982-12-01 |
| 言語 | eng |
| 内容記述 | The reduction of high speed impulsive noise for the UH-1H helicopter was investigated by using an advanced main rotor system. The advanced rotor system had a tapered blade planform compared with the rectangular planform of the standard rotor system. Models of both the advanced main rotor system and the UH-1H standard main rotor system were tested at 1/4 scale in the 4 by 7 Meter Tunnel. In plane acoustic measurements of the high speed impulsive noise demonstrated that the advanced rotor system on the UH-1H helicopter reduced the high speed impulsive noise by up to 20 dB, with a reduction in overall sound pressure level of up to 5 dB. |
| NASA分類 | ACOUSTICS |
| レポートNO | 83N16151
NASA-TM-84553
NAS 1.15:84553
L-15511
AVRADCOM-TR-82-B-6 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/163806 |
