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为了研究活性炭纤维毡的吸声性能,选取3种密度不同的活性炭纤维毡,采用双通道阻抗管声学分析仪测试125～2 500 Hz声波频率范围内的表面声阻抗率,计算吸声系数、特性阻抗、传播常数、结构常数4个声学参数,分析密度对活性炭纤维毡吸声性能的影响。研究发现,随着测试频率增加,试样吸声系数和传播常数升高,特性阻抗比和结构常数下降,但降幅变小,趋于稳定;随着活性炭纤维毡密度增加,试样声学参数均升高,但第一吸声波峰向低频移动,对应吸声系数变大。
Abstract：In order to study the sound absorbing properties of activated carbon fiber felts, three kinds of activated carbon fiber felts with different densities were selected, and the double channel acoustic analyzer with impedance tube was used to test the surface acoustic impedance within 125-2 500 Hz frequency sound waves. Then the four acoustic parameters, that is the sound absorption coefficient, the characteristic impedance, the propagation constant, and the structural constant, were calculated. Finally, the effect of density on the sound absorbing properties of activated carbon fiber felts was analyzed. It was found that with the increase of the frequency, the sound absorption coefficient and the propagation constant of the sample increased, but the characteristic impedance ratio and the structural constant decreased, but the decline was smaller and tended to be stable. With the increase of the density of activated carbon fiber felts, the acoustic parameters of the samples all increased, but the first resonance frequency moved towards low frequency, and the corresponding sound absorption coefficient increased.
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基本信息:
DOI：10.12194/j.ntu.20200930001
中图分类号:TU552
引用信息:
[1]沈岳,严雪峰,刘其霞.基于密度变化的活性炭纤维毡吸声性能分析[J],2021(04):46-50+57.DOI:10.12194/j.ntu.20200930001.
基金信息:
国家自然科学基金项目（51702167）;; 南通市科技计划项目（JC2018035）;; 江苏省先进纺织工程技术中心开放基金科研项目（XJFZ/2018/10）