哈尔滨工程大学学报Issue(12)：1458-1466,9.DOI:10.3969/j.issn.1006-7043.201401002
阻抗梯度变化介质的声学特性
Acoustic characteristics of the media with gradient change of impedance
摘要
Abstract
The media with gradient change of impedance is an acoustic media which is developed from multiple layer media.Using the principle of impedance matching method, better acoustic properties based on the media with gra-dient change of impedance with different characteristic impedance of materials can be obtained.Applying this media to underwater acoustic engineering, the model of acoustic propagation in the media was established and the sound properties were investigated.The calculation formulas for the reflection and sound absorption coefficients of the media with gradient change of impedance were derived.Numerical simulations were also conducted.The acoustic properties of the media with gradient change of impedance were compared with traditional homogeneous media.The rules of the number of layers were discussed.The media with gradient change of impedance were prepared and the experiments in a pulse acoustic tube were carried out.The experimental results showed that the preparation media with continuous distribution of impedance can meet the need of experiment.The measure results verified smaller re-flection coefficient and larger absorption coefficient of the media with gradient change of impedance, which provide a theoretical basis for the application of the media with gradient change of impedance in acoustic engineering.关键词
声阻抗/梯度变化/声学特性/反射系数/阻抗匹配/声学介质Key words
acoustic impedance/gradient change/acoustic characteristic/reflection coefficient/impedance matc-hing/acoustic media分类
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杨德森,孙玉,胡博,韩闯,靳仕源..阻抗梯度变化介质的声学特性[J].哈尔滨工程大学学报,2014,(12):1458-1466,9.基金项目
长江学者和创新团队发展计划资助项目（ IRT1228）；国家自然科学基金资助项目（11204049，11204050）；高等学校博士学科点专项科研基金资助项目（20122304120023）． （）
