連立共鳴器による低音域用吸音構造 : 薄型化に関する検討

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  • 川口 卓郎
    九州大学大学院人間環境学府空間システム専攻 : 修士課程
  • 藤本 一壽
    九州大学人間環境学研究院都市・建築学部門

書誌事項

タイトル別名
  • Absorptive structure in low frequencies by applying series-coupled resonators : Examination on making the thickness of the structure thin
  • レンリツ キョウメイキ ニ ヨル テイオンイキヨウキュウオン コウゾウ : ウスガタカ ニ カンスル ケントウ

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抄録

It is well known that a large air space is needed for absorbing sound in low frequencies by using porous material. Therefore, porous material is neither realistic nor practical for use of absorbing walls or ceilings in a small room such as a living room in a house. With these points as background, the authors have examined the absorbing structure in low frequencies by applying resonator absorbers and presented that the combination of three types of resonators makes good absorptions at three resonance frequencies and closing the opening of resonator with porous material of small flow resistance broadens the band width of absorbing frequencies. These results imply that resonator absorbers might realize good sound absorptions in low frequencies. In this paper, for making the thickness of the structure thin, the effects of the shape of resonators and the place of porous material in the resonators on the absorbing characteristics are examined by a numerical simulation based on FDTDM. Base on the results of the examinations, real panels are practically made, and the random incidence absorption coefficient of the panels is measured. Lastly apparent absorption coefficient of the panels is measured in an actual small meeting room.

収録刊行物

  • 都市・建築学研究

    都市・建築学研究 27 51-57, 2015-01-15

    九州大学大学院人間環境学研究院都市・建築学部門

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