WEKO3
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The Analysis of Helicopter Roter Noise
https://jaxa.repo.nii.ac.jp/records/34527
https://jaxa.repo.nii.ac.jp/records/34527ffb88b65-c6cc-4dcc-a5f5-97122107cf23
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
SA2401268.pdf (2.3 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||
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| 公開日 | 2015-03-26 | |||||||
| タイトル | ||||||||
| タイトル | The Analysis of Helicopter Roter Noise | |||||||
| 言語 | en | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||
| 資源タイプ | departmental bulletin paper | |||||||
| 著者 |
NAKAMURA, Yoshiya
× NAKAMURA, Yoshiya
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| 出版者 | ||||||||
| 出版者 | 東京大学宇宙航空研究所 | |||||||
| 出版者（英） | ||||||||
| 出版者 | Institute of Space and Aeronautical Science,University of Tokyo | |||||||
| 書誌情報 |
en : ISAS report/Institute of Space and Aeronautical Science,University of Tokyo 巻 42, 号 4, p. 111-151, 発行日 1977-09 |
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| 抄録（英） | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | Rotational noise which is predominant in helicopter noise is decomposed into thickness noise and loading noise by its cause of generation. It is also divided into near field noise and far field noise by its classification of radiating region. Such decomposition of noise sources and separation of an integral solution of wave equation into integrand and integrating region made it possible to predict noise characteristics analytically. The integrating region named "influential surface" can be determined once observer position and time are specified. All noise sources which will bring the pressure change at the observer simultaneously are distributed in this region. The influential surface changes its shape dynamically, because the relative velocity of the blade element to the observer varies over the rotor disk. The magnitude of near field noise is propotional to the area of the influential surface and that of far field noise is propotional to its time derivative. By these decompositions of the integral expression of pressure change it has become possible to predict analytically many noise characteristics such as wave form, noise level, spectrum, and so on, as the function of rotor parameters. Some methods of noise reduction have been proposed based on a parametric study. The thickness noise is considered to have fairly high noise level and to be one of potential cause of blade slap. The analytical study of the effect of blade-vortex interaction on the slap has been left for future investigation. | |||||||
| ISSN | ||||||||
| 収録物識別子タイプ | ISSN | |||||||
| 収録物識別子 | 0372-1418 | |||||||
| 書誌レコードID | ||||||||
| 収録物識別子タイプ | NCID | |||||||
| 収録物識別子 | AA00675986 | |||||||
| 資料番号 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 資料番号: SA2401268000 | |||||||
