| タイトル | A directional microphone array for acoustic studies of wind tunnel models |
| 著者（英） | Soderman, P. T.; Noble, S. C. |
| 発行日 | 1974-07-01 |
| 言語 | eng |
| 内容記述 | An end-fire microphone array that utilizes a digital time delay system has been designed and evaluated for measuring noise in wind tunnels. The directional response of both a four- and eight-element linear array of microphones has enabled substantial rejection of background noise and reverberations in the NASA Ames 40- by 80-foot wind tunnel. In addition, it is estimated that four- and eight-element arrays reject 6 and 9 dB, respectively, of microphone wind noise, as compared with a conventional omnidirectional microphone with nose cone. Array response to two types of jet engine models in the wind tunnel is presented. Comparisons of array response to loudspeakers in the wind tunnel and in free field are made. |
| NASA分類 | FACILITIES, RESEARCH, AND SUPPORT |
| レポートNO | 74A35404
AIAA PAPER 74-640 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/452069 |
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