Improved sound absorption performance of three-dimensional MPP space sound absorbers by filling with porous materials

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• 作者：Masahiro Toyoda^a ; ^{toyoda@kansai-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Kimihiro Sakagami^b ; Mitsuru Okano^b ; Takeshi Okuzono^b ; Emi Toyoda^c
• 关键词：Sound absorption ; MPP ; Space sound absorber ; Porous material ; BEM
• 刊名：Applied Acoustics
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：116
• 期：Complete
• 页码：311-316
• 全文大小：998 K

文摘

Because microperforated panels (MPPs), which can be made from various materials, provide wide-band sound absorption, they are recognized as one of the next-generation absorption materials. Although MPPs are typically placed in front of rigid walls, MPP space sound absorbers without a backing structure, including three-dimensional cylindrical MPP space absorbers (CMSAs) and rectangular MPP space absorbers (RMSAs), are proposed to extend their design flexibility and easy-to-use properties. On the other hand, improving the absorption performance by filling the back cavity of typical MPP absorbers with porous materials has been shown theoretically, and three-dimensional MPP space absorbers should display similar improvements. Herein the effects of porous materials inserted into the cavities of CMSAs and RMSAs are experimentally investigated and a numerical prediction method using the two-dimensional boundary element method is proposed. Consequently, CMSAs and RMSAs with improved absorption performances are illustrated based on the experimental results, and the applicability of the proposed prediction method as a design tool is confirmed by comparing the experimental and numerical results.