| タイトル | HHC study in the DNW to reduce BVI noise - An analysis |
| 著者（英） | Kube, Roland; Schultz, Klaus -J.; Booth, Earl R., Jr.; Niesl, Georg H.; Boyd, D. D., Jr.; Splettstoesser, Wolf R.; Streby, Olivier; Brooks, Thomas F. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 1991-01-01
1991 |
| 言語 | eng |
| 内容記述 | The noise of an aeroelastically scaled helicopter rotor has been studied in the German-Dutch wind tunnel in order to assess the utility of higher-harmonic control (HHC) in reducing blade-vortex interaction (BVI) noise. Acoustic data are presented for 3/rev, 4/rev, and 5/rev HHC, as applied to a typical landing approach rotor operating condition; noise reduction of up to 6 dB were found for advancing-blade BVI noise radiating upstream of the rotor, as well as for retreating blade BVI noise radiating below and downstream of the rotor. |
| NASA分類 | ACOUSTICS |
| レポートNO | 93A29405 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/319415 |
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