| Acoustic impedance of perforated panels covered by membranes |
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| 作者姓名： | SHENG Shengwo and ZHAO Songling |
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| 作者单位： | Institute of Acoustics，Tongji University，Shanghai 200092 |
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| 摘 要： | I.IntroductionThepcrforatcdpanc1conncctcdwithacavityisancffectivercsonanccsoundab-sorbingconstructionwhichisuscdin1argequantityinthenoisccontro1cnginccring.Theacousticalpcrformanceofthisconstructionhasbccnthoroughlyinvestigatcdl'l.Inordertoincreascthercsonanccabsorptioncocfficicntofthcpcrforatcdpanc1sandexpandtheabsorptionfrcqucncybandwidth,akcywayistomakcitsrc1ativcspcciflcacousticrcsist-anccrtobccontro11cdinamodc-ratcrangc.Boththcthcoryandthccxpcricnceindi-catethatthebcstva1ucsorrarc1.5-2.H…
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Acoustic impedance of perforated panels covered by membranes |
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| Authors: | SHENG Shengwo and ZHAO Songling |
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| Abstract: | In this paper, acoustical characteristic of a perforated panel with cover membranes is theoretically investigated. Based on the fundamental principle of acoustics, the expressions of reflecting the sound transmission of this construction are derived and the formulas of calculating the specific acoustic impedance are obtained, We also discuss the changes of specific acoustic resistance with some important parameters, such as the frequency, the thickness of air layer and the surface density of the membrane. A good agrecment between predicted results and measured data is illustrated. |
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| Keywords: | Cover membrane Perforated panel Acoustic impedance |
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