| タイトル | Active Noise Control of Radiated Noise from Jets Originating NASA |
| 本文（外部サイト） | http://hdl.handle.net/2060/20140002753 |
| 著者（英） | Doty, Michael J.; Turner, Travis L.; Fuller, Christopher R.; Schiller, Noah H. |
| 発行日 | 2013-09-01 |
| 言語 | eng |
| 内容記述 | The reduction of jet noise using a closed-loop active noise control system with highbandwidth active chevrons was investigated. The high frequency energy introduced by piezoelectrically-driven chevrons was demonstrated to achieve a broadband reduction of jet noise, presumably due to the suppression of large-scale turbulence. For a nozzle with one active chevron, benefits of up to 0.8 dB overall sound pressure level (OASPL) were observed compared to a static chevron nozzle near the maximum noise emission angle, and benefits of up to 1.9 dB OASPL were observed compared to a baseline nozzle with no chevrons. The closed-loop actuation system was able to effectively reduce noise at select frequencies by 1-3 dB. However, integrated OASPL did not indicate further reduction beyond the open-loop benefits, most likely due to the preliminary controller design, which was focused on narrowband performance. |
| NASA分類 | Aircraft Design, Testing and Performance |
| レポートNO | NF1676L-17391
L-20325
NASA/TM-2013-218041 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
|
