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Studies on the Sounds Emitted by Revolving Airscrews. : Part II. Experiments with Model Airscrews.
https://jaxa.repo.nii.ac.jp/records/35343
https://jaxa.repo.nii.ac.jp/records/35343c87c368e-739b-4936-a7f0-8b1936e97ec6
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
SA4146519.pdf (1.4 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 | Studies on the Sounds Emitted by Revolving Airscrews. : Part II. Experiments with Model Airscrews. | |||||||||||
| 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
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| 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 80, p. 389-440, 発行日 1932-07 |
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| 抄録（英） | ||||||||||||
| 内容記述タイプ | Other | |||||||||||
| 内容記述 | The nature of the sounds emitted by a revolving airscrew was studied with the aid of models of one-third and one-quarter the original size. Models of six different airscrews were tested, rotating them by means of a noiseless electric motor. The sounds were recorded by an electric arrangement consisting of a condenser-microphone, amplifier, and an oscillograph, and the tone-colours of the sounds of different airscrews were studied by analyzing the records. The scale effect, the effect of variation of the geometrical pitch, and the directional property of the sounds were also studied. A notable difference was found in the nature of the sounds emitted by the Reed metal airscrew made of twisted thin duralumin plate, and the airscrew of the usual thick form. In the former, the fundamental tone, having a frequency corresponding to the product of the number of blades and the number of rotations per second, is prominent only in the plane of rotation, while in the other positions the acoustic spectrum is rather continuous, even at the highest revolutions. On the other hand, in the airscrew of the usual thick form, the fundamental tone comes out strong at high revolutions, both in the plane of rotation as well as in a position 45°to it. The directional property thus differs with different airscrews, while in the matter of scale effect the smaller size seems to be somewhat advantageous. Finally, the general effect of the airscrew sound on our sensation is studied. At slow rotations, the component having a high but indefinite frequency predominates, and the sound being rather noiselike, while the low frequency component, especially the fundamental tone, becomes louder and louder on increasing the number of rotations. At the highest rotation both components attain the same degree of loudness. | |||||||||||
| 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: SA4146519000 | |||||||||||
