A theoretical study on the effect of a permeable membrane in the air cavity of a double-leaf microperforated panel space sound absorber |
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| Institution: | 1. Environmental Acoustics Laboratory, Department of Architecture, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan;2. Kajima Technical Research Institute, Tobitakyu, Chofu, 182-0036 Tokyo, Japan;1. TOFAŞ Türk Otomobil Fabrikası A.Ş., Osmangazi 16369, Bursa, Turkey;2. Istanbul Technical University, Mechanical Engineering Faculty, Gümüşsuyu, 34439 Istanbul, Turkey;1. Faurecia Emissions Control Technologies, Bangalore Technical Centre, India;2. Indian Institute of Science, Bangalore, India;1. Department of Architecture, Faculty of Environmental and Urban Engineering, Kansai University, 3-3-35, Yamate-cho, Suita-shi, Osaka 564-8680, Japan;2. Environmental Acoustics Laboratory, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan |
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| Abstract: | A double-leaf microperforated panel absorber (DLMPP) is composed of a two microperforated panel (MPP) with a air cavity in-between, and without any backing structure. It shows a Helmholtz-type resonance peak absorption and additional low frequency absorption, therefore it can be used as a wideband space sound absorber. In this study, a theoretical study is made to examine the effect of a permeable membrane inside the air-cavity. Permeable membranes are studied in our previous studies and proved to be effective to improve the sound absorption performance of various type MPP sound absorbers. We investigate the absorption characteristics of a DLMPP with a permeable membrane in the cavity through numerical examples, and also studied the effect of honeycomb in the cavity of the same sound absorption structure. |
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| Keywords: | Microperforated panel Permeable membrane Sound absorption Space sound absorber Honeycomb |
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