摘要
噪声污染是一个受到社会广泛关注的重要问题,因此噪声控制得到国内外的大量研究。多孔结构的吸声材料可以有效地消音降噪,探讨三维网状孔隙结构的泡沫镍的吸声性能。这种结构的泡沫镍在很多国家都已有大规模的生产,质量稳定,孔隙尺寸规格丰富。以常用作多孔电极的泡沫镍片材为研究对象,采用驻波管法测定其吸声系数。结果发现,泡沫镍片材总厚为8 mm左右的叠层试样对频率4000 Hz的入射声波显示出优良的吸声效果,吸声系数接近0.8。设置厚度为18.5 mm左右的空腔还可以大大提高叠层试样在2500和3150 Hz等较低声频下的吸声效果,吸声系数增加到0.5以上。研究还表明,通过空腔与试样两者的交替叠加,可以在2000 Hz的低频下获得良好的吸声效果,吸声系数接近0.5。因此,三维网状泡沫镍可以用作人耳敏感频段的优质吸声体。
Noise pollution is an important problem and is paid broad attention all over the world,so the noise control has been plentifully studied in recent years. Sound absorption materials with porous structure can effectively reduce noises,and the sound absorption performance of reticulated nickel foam was investigated. With this structure,the nickel foam was manufactured in a large scale in many countries,which had a steady quality and abundant classes of pore size. The plate of nickel foam,which was normally used as porous electrodes,was studied,and the sound absorption coefficient was measured by stationary wave route. The results showed that the multilayer sample of nickel foam plate,which was totally about 8 mm in thickness,exhibited an excellent sound absorption property for incident sound waves at the frequency of 4000 Hz,with the sound absorption coefficient approaching 0. 8. In addition,constituting a cavum with the thickness of about 18. 5 mm could greatly improve the sound absorption performance of multi-layer samples at relatively low sound frequencies of 2500 and 3150 Hz,and improve the sound absorption coefficient up to 0. 5 or more. The research also showed that alternately piling up the cavum and the sample could achieve a quite good effect of sound absorption at the low frequency of 2000 Hz,and the sound absorption coefficient approached 0. 5. It could be seen that the nickel foam might also be commendably used as the high quality material of sound absorption in the frequency range sensitive for human ears.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2015年第1期49-54,共6页
Chinese Journal of Rare Metals
基金
北京市教育委员会凝聚态物理重点学科共建项目(XK100270454)
北京青少年科技俱乐部科研实践计划(BJCTC13)
北京师范大学测试基金(C13)资助
关键词
多孔材料
泡沫金属
泡沫镍
吸声系数
porous material
metal foam
nickel foam
sound absorption coefficient
