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タイトル: | Relationship between Helmholtz-resonance absorption and panel-type absorption in finite flexible microperforated-panel absorbers |
著者: | Toyoda, Masahiro Mu, Rui Lin Takahashi, Daiji |
著者名の別形: | 豊田, 政弘 高橋, 大弐 |
キーワード: | Eigen-mode vibration Helmholtz-resonance absorption Mass-spring resonance Microperforated-panel absorber Panel-type absorption |
発行日: | Apr-2010 |
出版者: | Elsevier |
誌名: | Applied Acoustics |
巻: | 71 |
号: | 4 |
開始ページ: | 315 |
終了ページ: | 320 |
抄録: | Microperforated panels (MPPs) can provide wide-band absorption without fibrous and porous materials and are recognized as next-generation absorption materials. Although the fundamental absorbing mechanism of an MPP absorber is Helmholtz-resonance absorption, sound-induced vibration of an MPP itself can affects the absorption characteristics. There have been some studies considering the effects of the sound-induced vibration and there even is a proposal to widen the absorption bandwidth by positively utilizing the vibration of an MPP itself. On the other hand, in a previous study, the relationship between MPP absorbers and panel-type absorbers was investigated with infinite theory. However, the relationship between Helmholtz-resonance absorption and panel-type absorption in finite flexible MPP absorbers has not been clarified. Herein, from the viewpoint of an absorption-characteristics transition with the perforation ratio, the relationship between Helmholtz-resonance absorption and panel-type absorption including the effects of eigen-mode vibrations of the panel is theoretically and experimentally investigated. The analytical model considers a finite flexible MPP supported in a circular duct, and the predicted data for the absorption coefficient under normal incidence is validated by an experiment using an acoustic tube. From this investigation, it is found that panel-type absorption due to eigen-mode vibrations of the panel occurs independently from Helmholtz-resonance absorption, while panel-type absorption due to a mass–spring resonance of a panel and a back cavity has a trade-off relationship with Helmholtz-resonance absorption with respect to the perforation ratio. |
著作権等: | © 2009 Elsevier Ltd All rights reserved. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/95081 |
DOI(出版社版): | 10.1016/j.apacoust.2009.10.007 |
出現コレクション: | 学術雑誌掲載論文等 |
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