孔结构对多孔铝空气声吸收性能的影响
Air Sound Absorption Property of Porous Aluminum
摘 要
对多孔铝的空气声吸收性能进行了研究.结果表明:多孔铝具有较高的空气声吸收系数,并且与孔结构密切相关.声吸收系数在低频端(<1kHz)较低,高频端(>1kHz)则可达到085以上.随着孔隙率、孔径的减小,多孔铝的共振吸声系数有所下降,吸声频谱曲线向低频方向移动,且频带宽度展宽.
吸声系数
频带
porous aluminum
sound absorption efficient
frequency bandwidth
Abstract
The air sound absorption property of porous aluminum was studied. The sound absorption coefficient was smaller in low frequency (<1kHz) than that in high frequency (>1kHz).In high frequency,the sound absorption coefficient could reach 0.85 and decreased when the porosity and pore diameter decreased.When the porosity and pore diameter reduced,the sound absorption curve moved to the low frequency zone and the frequency bandwidth increased at the same time.
中图分类号 TG146
所属栏目
基金项目 国家自然科学基金重点资助项目(50231010);国家自然科学基金重大项目(90205005)
收稿日期 2004/11/29
修改稿日期 2005/1/12
网络出版日期
作者单位点击查看
备注郑明军(1971-),男,江苏阜宁人,博士后.
引用该论文: ZHENG Ming-jun,CHEN Feng,HE De-ping. Air Sound Absorption Property of Porous Aluminum[J]. Materials for mechancial engineering, 2006, 30(2): 39～41
郑明军,陈锋,何德坪. 孔结构对多孔铝空气声吸收性能的影响[J]. 机械工程材料, 2006, 30(2): 39～41
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参考文献
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【2】Gibson L J,Ashby M F.Cellular solids-structure and properties[M].Great Britain:Cambridge University Press,1999.
【3】WU Zhao-jin,HE De-ping.Changes in porosity of foamed Al during solidification[J].Chinese Science Bulletin,2000,45(18):1667-1672.
【4】YANG Donghui,He Deping.Porosity of porous Al alloy[J].Science in China:B,2001,44(4):411-419.
【5】Zheng Mingjun,He Depin,Dai Ge.The additional force field in the cooling process of the cellular Al alloy[J].Science in China:B,2002,45(6):598-607.
【6】Cheng Guiping,He Deping,Shu Guangji.Underwater sound absorption property of porous aluminum[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2001,179:191-194.
【7】Zhenkai Xie,Teruyuki Ikeda,Yosiyuki Okuda,et al.Sound absorption characteristics of lotus-type porous copper fabricated by unidirectional solidification[J].Materials Science and Engineering:A,2004,386:390-395.
【8】赵松龄.噪声的降低与隔离[M].上海:同济大学出版社,1985.
【9】郑明军.多孔铝的渗流制备方法及其性能研究[D].南京:东南大学,1999.
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