2017 Fiscal Year Final Research Report
Study on analysis and quantifying of the amplitude modulated sound generated from wind turbines
| Project/Area Number |
15K06336
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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 |
Architectural environment/Equipment
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| Research Institution | Meijo University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | 風車騒音 / 周期性変動音 / 振幅変調深さ / 音響測定 / 指向特性 / 伝搬特性 / ロータ回転速度 / 風速 |
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| Outline of Final Research Achievements |
Wind turbine noise generally has the amplitude modulation components which often cause psychological annoyance in residential areas around wind farms. To examine the characteristics of amplitude modulated sound generated from a single wind turbine, field measurements have been performed under various wind conditions. The method for extracting the amplitude modulation components from the analyzed sound pressure levels was proposed. The distinguishable directivity of the amplitude modulation contained in wind turbine noise was revealed, whose pattern tended to be highest in the directions of approximately 60 degrees relative to the nacelle. In addition, the strength distributions of the amplitude modulation at distances of up to 200 m were examined. Almost all the strengths of the amplitude modulation component still remained 2 dB or more at distances of even a few hundred meters, whereas the A-weighted sound pressure levels decreased with increasing propagation distance.
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| Free Research Field |
建築環境計画，社会音響学，騒音制御
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