WEKO3
アイテム
Studies on the Sounds Emitted by Revolving Airscrews. Part I.
https://jaxa.repo.nii.ac.jp/records/35342
https://jaxa.repo.nii.ac.jp/records/353423b68db98-b74b-4e7d-b7e3-4a7e112984c0
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
SA4146518.pdf (1.0 MB)
|
|
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2015-03-26 | |||||||||||
| タイトル | ||||||||||||
| タイトル | Studies on the Sounds Emitted by Revolving Airscrews. Part I. | |||||||||||
| 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 |
OBATA, Juichi
× OBATA, Juichi
× YOSIDA, Yahei
× MORITA, Sakae
|
|||||||||||
| 出版者 | ||||||||||||
| 出版者 | 東京帝國大學航空研究所 | |||||||||||
| 出版者（英） | ||||||||||||
| 出版者 | Aeronautical Research Institute, Tokyo Imperial University | |||||||||||
| 書誌情報 |
東京帝國大學航空研究所報告 en : Report of Aeronautical Research Institute, Tokyo Imperial University 巻 6, 号 79, p. 361-387, 発行日 1932-07 |
|||||||||||
| 抄録（英） | ||||||||||||
| 内容記述タイプ | Other | |||||||||||
| 内容記述 | This paper presents the results of investigations that were made on the sounds emitted by two actual airscrews; the one being of wood and the other of metal. The sounds were recorded as faithfully as possible by means of an electrical arrangement, consisting of a condenser microphone, a powerful amplifier and an oscillograph. The analyses were made on the records. The sounds of a rotating airscrew consist of two components-the low and the high frequency sounds. The former is produced mainly by the pressure difference in the two sides of the blade, and has the fundamental note with a pitch corresponding to the product of the number of rotations and the number of blades. Over-tones are of course present, and they differ in different propellers. Flexural vibrations of the blades and shaft also contribute in producing the low frequency component. The high frequency component arises from the vortices shed from the blades and in reality is a group of waves having a high but very indefinite pitch. At slow rotations only the high frequency component is observable, while at high rotations the low frequency component, especially the fundamental, becomes very audible, and the two components attain the same order of loudness. A 2-A audiometer was also empolyed for the purpose of studying the relations between the loudness and the number of rotations and the distance. The loudness increases linearly with the number of rotations, and diminishes with the distance at a much more rapid rate than that demanded by the inverse-square law. | |||||||||||
| 書誌レコードID | ||||||||||||
| 収録物識別子タイプ | NCID | |||||||||||
| 収録物識別子 | AA00387631 | |||||||||||
| 資料番号 | ||||||||||||
| 内容記述タイプ | Other | |||||||||||
| 内容記述 | 資料番号: SA4146518000 | |||||||||||
