2021 Fiscal Year Final Research Report
Proposal of walls made of air for shielding low-frequency noise from equipments
Project/Area Number |
19K04742
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 23020:Architectural environment and building equipment-related
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Research Institution | Fukuoka University |
Principal Investigator |
ANAI Ken 福岡大学, 工学部, 教授 (10325467)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | ヒートポンプ給湯機 / アクティブ騒音制御 / 低周波音 |
Outline of Final Research Achievements |
The heat pump water heater is revolutionary technique that can use heats in the air. Machine units of the heat pump water heater at outside unavoidably have large opening for air-intake in principle. For that reason, there is a danger that the units may be noise sources in midnight. In this study, active noise control technique was applied for reducing low-frequency noise. This technique made use of sound interference phenomenon, and it could reduce the noise emitting from the opening. Suitable numbers and positions of interference sources or a controlling microphone were shown by using numerical simulations and real-size model experiments. Effectiveness of this technique in spaces with reflective surfaces was also made clear.
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Free Research Field |
環境音響学,騒音制御
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Academic Significance and Societal Importance of the Research Achievements |
アクティブ騒音制御技術は発展途上の技術であり,省エネルギー設備から生じる騒音に対する適用可能性が詳細に検討されることはなかった。本研究では,最新の数値シミュレーションと精緻な実物大模型実験により,制御効果を可視化し,適切な制御方法を具体的に示し,得られる効果を定量的に明らかにした。本研究において,適切に構築されたアクティブ騒音制御システムによる低周波音の放射を抑制する能力は,従来の遮音塀による対策と同等の効果を発揮する可能性が示された。
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