Study on the generating mechanism and prevention equipment of low frequency self-excited sound by air flow
| Project/Area Number |
24560250
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | Saitama University |
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Principal Investigator |
NAGAMINE Takuo 埼玉大学, 理工学研究科, 准教授 (00323379)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Yuichi 埼玉大学, 大学院理工学研究科, 教授 (30134828)
MORI Hiroki 九州大学, 工学研究院, 准教授 (50451737)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 自励音 / ウインドスロッブ / 空力騒音 / 低周波 / 低周波騒音 / 流体関連振動 / 低周波音 |
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| Outline of Final Research Achievements |
Self-excited sound caused by flow is observed in the vehicle cabin, when the vehicle runs with an open window. This phenomenon is called wind-throb. In this study, we measure the sound pressure at the vehicle cabin and the Helmholtz resonator in laboratory. We also explore the possibility of suppression of self-excited sound generated by fluid resonant oscillation. We tried to prevention of wind-throb by using of a baffle plate. A baffle plate is set inside of the vehicle’s cabin. Accordingly, in this study the baffle plate prevents from occurring wind-throb. As equipment, a baffle plate is installed, the flow of air is changed, and vortices are emitted outside. The form and the attachment position of this baffle plate were examined.
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Report
(4 results)
Research Products
(5 results)
