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- KITAMURA Toshiya
- University of Yamanashi
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- YAMADA Tom
- Mirapro Co., Ltd
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- TAKAHASHI Yuki
- University of Yamanashi
Bibliographic Information
- Other Title
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- 111 外乱音によるエッジトーンのロックイン条件に関する研究(空力騒音(1))
Abstract
A sound level of noises generating from aero flow often grow by resonance of eddy fluctuation sound around structure objects and by lock-in phenomenon of the eddy fluctuation into the resonance sound frequency. An understanding of lock-in conditions is important to the control of the aero flow noise. We made a virtual resonance system in an edge-tone system by adding of disturbance sound to a part of the air nozzle and measured frequencies and sound pressure levels of the disturbance sound. This study evaluates the condition of lock-in phenomenon from the results. Edge tone locked in disturbance sound at about -18dB from the edge tone level without disturbance if the edge-tone frequency is close to disturbance frequency. If the edge-tone frequency is 20% away from disturbance, edge-tone locked in at a few dB lower than edge tone level.
Journal
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- The Proceedings of the Symposium on Environmental Engineering
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The Proceedings of the Symposium on Environmental Engineering 2010.20 (0), 39-41, 2010
The Japan Society of Mechanical Engineers
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Details 詳細情報について
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- CRID
- 1390001205836964352
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- NII Article ID
- 110008739802
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- ISSN
- 24242969
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed