文章摘要
马黎黎,王仁乾.基材含微粒的空腔结构吸声器吸声性能预报的研究[J].声学技术,2006,(3):175~181
基材含微粒的空腔结构吸声器吸声性能预报的研究
Absorption capability of absorbers with cavity and made of material containing particles
投稿时间:2005-07-19  修订日期:2005-09-15
DOI:
中文关键词: 复合材料  微粒  空腔  吸声器  吸声系数
英文关键词: composite material  inclusion  cavity  absorption coefficient  absorber
基金项目:
作者单位
马黎黎 北京大学信息科学技术学院, 北京, 100871 
王仁乾 北京大学信息科学技术学院, 北京, 100871 
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中文摘要:
      采用一种近似方法计算含球形微粒和空腔结构吸声器的吸声系数,即首先用自洽理论,计算掺入微粒的复合材料的等效力学参数,再用求空腔结构吸声器的等效力学参数方法,计算这种复合材料具有空腔结构的该参数,最后用声波在分层吸收媒质中传播模型来计算能量吸收系数。所得数值模拟结果表明:基材掺入微粒形成的复合材料其吸声性能有不同程度的变化,性能的提高与否与基材和微粒的种类、孔隙率及粒子分布概率密度等因素有关;对于某些含微粒的复合材料若开空腔则可进一步提高吸声器的低频吸声性能。总之,基材含微粒的空腔结构吸声器的吸声系数是以不同程度的灵敏度受控于表征微粒的参数以及空腔结构。
英文摘要:
      An approximate technique is used to calculate the absorption coefficient of absorbers containing a cavity and made of material with scattered spherical particles.The technique is based on a self-consistent theory and a method of calculating equivalent mechanic parameters of an absorber containing a cavity.The simulation results show that the absorption capability can be improved if the material of an absorber contains some particles,and the degree of improvement is related to the type,size,shape,porosity,and probability density of particle distribution,and if the absorber is made of a particle and cavity-loaded material,its absorption capability is much better at low frequencies.It is concluded that absorption capability of an absorber is controlled by the parameters of inclusion and the structure of cavity.
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