| 泡沫铝合金消除气体噪声的试验研究 |
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| 引用本文： | 杨思一,吕广庶.泡沫铝合金消除气体噪声的试验研究[J].材料科学与工艺,2005,13(6):570-571,575. |
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| 作者姓名： | 杨思一 吕广庶 |
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| 作者单位： | 北京理工大学,材料科学与工程学院,北京,100081;山东理工大学,机械工程学院,山东,淄博,255049;北京理工大学,材料科学与工程学院,北京,100081 |
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| 摘 要： | 以空气压缩机为噪声源,在不同气体压力条件下,分别测试了3种不同孔径的泡沫铝试样以及空载时排气噪声值,阐述了噪声产生的特点,并根据小孔消声理论分析了泡沫铝的消声机理.研究发现:泡沫铝在高频段有很好的降噪效果,低频段的效果相对较弱,并且孔径越小,消声效果越好;泡沫铝的降噪效果与孔径尺寸、孔结构、孔隙率、宏观结构及原始噪声类型有关.
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| 关 键 词： | 泡沫铝合金 噪声 气流 孔径 孔隙率 |
| 文章编号： | 1005-0299（2005）06-0570-02 |
| 收稿时间： | 2004-06-17 |
| 修稿时间： | 2004-06-17 |
Experimental study on eliminating airflow noise by Al-alloy foam |
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| YANG Si-yi,LU Guang-shu.Experimental study on eliminating airflow noise by Al-alloy foam[J].Materials Science and Technology,2005,13(6):570-571,575. |
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| Authors: | YANG Si-yi LU Guang-shu |
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| Abstract: | This paper considers a compressor as a noise source. Under different pressures, noise values of three kinds of Al-alloy foams of different pore sizes are tested, respectively. Noise values are also tested when there is no load and the noise characteristics are described. The causes of noise elimination by Al-alloy foam are analyzed according to the little hole eliminating noise principle. The research found that the denoising effect of Al-alloy foam is very excellent at a high frequency band and it is not evident at a low frequency band. The less the size of its pore, the better the effect of noise elimination. The denoising effect of Al-alloy foam is related with pore sizes, structures, porosities, macroscopical shapes and the types of noise source. |
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| Keywords: | Al-alloy foam noise airflow pore size porosity |
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