| An Elastic Absorber Theory for a Thin Fabric Sheet |
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| 作者姓名： | 张新安 |
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| 作者单位： | [1]Institute of Acoustics,Tougji University, Shanghai 200092, China
Institute of Acoustics,Tougji University, Shanghai 200092, China [2]Key Laboratory of Shanxi Province of Functional Fabric, Xi＇an Polytechnic University, Xi ＇an 710048, China |
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| 基金项目： | Foundation item, Key Laboratory Items of Shanxi Province （No. 05JS07） |
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| 摘 要： |
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| 关 键 词： | 建筑物 建筑结构 纤维材料 复合材料 |
| 文章编号： | 1672-5220（2007）03-0375-06 |
| 修稿时间： | 2006-08-20 |
An Elastic Absorber Theory for a Thin Fabric Sheet |
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| ZHANG Xi-nan.An Elastic Absorber Theory for a Thin Fabric Sheet[J].Journal of Donghua University,2007,24(3):375-380. |
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| Authors: | ZHANG Xi-nan |
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| Abstract: | The current sound absorption theory which is based on Rayleigh model believes that fibrous material absorb sound by the fluid frictional energy dissipation between the air and the solid fibers. However, Rayleigh model is only useful for a quanlitative understanding of effects in a porous material but not for calculation of the acoustical properties of real absorbent. In this paper, a new vibration sound absorption theory which is totally different from classical theory was put forward. The specific acoustic impedance of fiber layers have been derived from the membrane vibration equation and the sound absorption coefficient calculated agree with test results. The new theory can explain the phenomenon that thin fiber layers exhibit less sound absorption coefficient when it was as the cover fabric of sound absorber, but it is mare efficient to sound absorption when it was hang as the curtains or have back cavity behind it. |
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| Keywords: | membrane vibration theory specific acoustic impedance fibrous material sound absorption coefficient |
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