| タイトル | Effect of forward motion on engine noise |
| 本文（外部サイト） | http://hdl.handle.net/2060/19780002150 |
| 著者（英） | Blankenship, G. L.; Low, J. K. C.; Merriman, J. E.; Watkins, J. A. |
| 著者所属（英） | Douglas Aircraft Co., Inc. |
| 発行日 | 1977-10-01 |
| 言語 | eng |
| 内容記述 | Methods used to determine a procedure for correcting static engine data for the effects of forward motion are described. Data were analyzed from airplane flyover and static-engine tests with a JT8D-109 low-bypass-ratio turbofan engine installed on a DC-9-30, with a CF6-6D high-bypass-ratio turbofan engine installed on a DC-10-10, and with a JT9D-59A high-bypass-ratio turbofan engine installed on a DC-10-40. The observed differences between the static and the flyover data bases are discussed in terms of noise generation, convective amplification, atmospheric propagation, and engine installation. The results indicate that each noise source must be adjusted separately for forward-motion and installation effects and then projected to flight conditions as a function of source-path angle, directivity angle, and acoustic range relative to the microphones on the ground. |
| NASA分類 | AIRCRAFT PROPULSION AND POWER |
| レポートNO | 78N10093
NASA-CR-134954
MDC-J7708 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/180829 |
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