| 穿孔法改进泡沫铝的吸声性能 |
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| 引用本文： | 袁文文,李言祥,陈祥. 穿孔法改进泡沫铝的吸声性能[J]. 中国有色金属学报, 2011, 21(1) |
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| 作者姓名： | 袁文文 李言祥 陈祥 |
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| 作者单位： | 清华大学,机械工程系,教育部先进成形制造重点实验室,北京,100084 |
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| 基金项目： | 浙江省科技研究计划资助项目(2009C31049) |
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| 摘 要： | 利用熔体发泡技术制备不同孔径和气孔率的泡沫铝,对不同气孔率的原始状态泡沫铝以及孔径为1.1 mm的穿孔泡沫铝的吸声性能进行研究。结果表明:未设置背腔时,原始状态泡沫铝的吸声性能不高,设置背腔后,由于泡沫铝中所含通透结构的作用,泡沫铝的吸声性能明显提高;穿孔泡沫铝的穿孔率在0.5%～1.0%范围,设置60～80 mm背腔时可使降噪系数超过0.42,比原始状态泡沫铝不设置背腔时的降噪系数高2倍左右;穿孔泡沫铝设置背腔后的吸声特性符合Helmholtz共振吸声的规律,但受到穿孔结构、泡沫铝原本存在的缺陷组成的通透结构和气泡孔在穿孔过程中被打开的小开口等因素的影响。
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| 关 键 词： | 泡沫铝 穿孔 吸声性能 Helmholtz共振 |
Improving sound absorption of aluminum foams by drilling holes |
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| YUAN Wen-wen,Li Yan-xiang,CHEN Xiang. Improving sound absorption of aluminum foams by drilling holes[J]. The Chinese Journal of Nonferrous Metals, 2011, 21(1) |
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| Authors: | YUAN Wen-wen Li Yan-xiang CHEN Xiang |
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| Affiliation: | YUAN Wen-wen,Li Yan-xiang,CHEN Xiang (Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China |
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| Abstract: | Aluminum foams with various cell sizes and porosities were prepared by the melt foaming process.The sound absorption properties of aluminum foams with different porosities in as-received state and with drilling holes of 1.1 mm diameter were investigated.The results show that the aluminum foams in as-received state with no back cavity do not possess high sound absorbability,while setting up a back cavity behind the foam can improve the sound absorbability according to some permeable structures existing insid... |
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| Keywords: | aluminum foam drilling holes sound absorption Helmholtz-type resonator |
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