Low-frequency Gibbs-type oscillation in finite solid–fluid sonic crystals and its application in sub-wavelength wave isolation for waterborne sound
Low-frequency Gibbs-type oscillation in finite solid–fluid sonic crystals and its application in sub-wavelength wave isolation for waterborne sound
复制标题
有限固流声波晶体中的低频吉布斯振荡及其在水声亚波长隔波中的应用
DOI：
10.1088/1361-6463/ab438b
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发表时间：
2019-10
期刊：
影响因子：
--
通讯作者：
Wenwu Cao
中科院分区：
文献类型：
--
作者：
Wei Lu;Chen-guang Xu;Sai Zhang;Bai-qiang Xu;Wenwu Cao
Blocking underwater sound waves using sub-wavelength structures, i.e. with the unit size much smaller than the incident wavelength, is a known challenge and highly desirable in practical applications. In this work, we show that this can be easily achieved utilizing the Gibbs-type oscillation properties of finite solid–fluid sonic crystals (SFSCs). First, the influence of solid parameters and the period number of SFSC on the Gibbs-type oscillation within the first Bragg passband is comprehensively investigated. Based on this, isolations with periodic cells of sub-wavelength size are designed and numerically demonstrated through finite element simulations. The results show that the broadband underwater sound blocking effect does exist in a finite SFSC whose total thickness is only one quarter of the incident wavelength, while a very low transmittance of less 1% is achieved. Our work will provide a new approach to control low-frequency underwater sound waves using Bragg sonic crystals.
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