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?含泡胶质体层的声透射特性研究*

DOI: 10.13232/j.cnki.jnju.2013.03.007, PP. 394-401

Keywords: 气泡,胶质体,自洽场方法,等效媒质方法

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Abstract:

?对包含有限数目气泡的单层胶质体模型,在理论上研究了垂直入射的平面纵波的透射特性.利用计及多重散射效应的自洽场方法,严格求解了该模型中的声传播问题并得到了声透射系数.数值计算结果证明声波可在略高于气泡木征频率的频段内发生局域化,且局域化现象在气泡含量较小时己经出现.此外,采用等效媒质方法对该模型进行均匀化近似后求解了其声透射系数.在不同结构参数下,分析比较了两种方法所得结果的差异,考察了等效媒质方法的适用性.结果表明多重散射效应在气泡含量较低时己显著影响当前模型的声透射特性,尽管等效媒质方法在气泡含量极低(~10-5)时可简便的得到基本有效的计算结果,但当气泡含量变高(~10-4)时,忽略多重散射效应的等效媒质方法己不能正确的描述此类媒质的声传播特性.

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