A subwavelength asymmetric acoustic design for waveform-preserved highly forward transmission
A subwavelength asymmetric acoustic design for waveform-preserved highly forward transmission
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用于波形保持高度前向传输的亚波长非对称声学设计
DOI：
10.1063/1.5041323
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发表时间：
2018-08
期刊：
影响因子：
1.6
通讯作者：
Wenwu Cao
中科院分区：
文献类型：
--
作者：
Sai Zhang;Baiqiang Xu;Guanghua Hu;Sen Cui;Huizi He;Wenwu Cao
我们提出了一种亚波长声非对称传输（SAAT）设计，它由一个固体-流体超晶格（SFSL）和一个声光栅（AG）耦合而成，可以提供具有很高的前向传输和几乎禁止的后向传输的波形保持传输。传输波的波形保持的独特特征归因于AG的低频衍射特性以及SFSL在宽带频率范围内的异常禁透射。用有限元方法计算的传输波的频率范围和波束方向与分析预测完全一致。通过研究几个关键参数的影响，包括角取向的AG单元和SFSL的周期数，我们能够优化SAAT设备的设计，它可以增加能量的前向传输高达60%，而没有波形失真，和反向传输几乎是禁止的。我们提出了一种由固体-流体超晶格（SFSL）与声光栅（AG）耦合构成的亚波长声非对称传输（SAAT）设计，它可以提供具有很高的前向传输和几乎禁止的后向传输的波形保持传输。传输波的波形保持的独特特征归因于AG的低频衍射特性以及SFSL在宽带频率范围内的异常禁透射。用有限元法计算的透射波的频率范围和波束方向与解析预测完全一致。通过研究AG单元的角取向和SFSL的周期数等几个关键参数的影响，我们能够优化SAAT器件设计，可以将能量前向传输提高高达60%，而不会出现波形失真，并且反向传输几乎是免费的。
We propose a subwavelength acoustic asymmetric transmission (SAAT) design constituting of a solid-fluid superlattice (SFSL) coupled with an acoustic grating (AG), which can provide waveform-preserved transmission with very high forward transmission and nearly forbidden backward transmission. The unique feature of waveform preservation of the transmission wave is attributed to the low-frequency diffraction characteristics of the AG together with the extraordinary forbidden transmission of SFSL in a broadband frequency range. Both the frequency range and the beam direction of the transmission wave calculated by using finite element method agree perfectly with the analytical predictions. By investigating the influence of several key parameters, including the angular orientation of the AG unit and the periodicity number of the SFSL, we were able to optimize the SAAT device design, which can increase the energy forward transmission up to 60% without waveform distortion, and the reverse transmission is nearly forbidden. Such remarkable features of our SAAT make this design favorable in unidirectional signal transmission applications.We propose a subwavelength acoustic asymmetric transmission (SAAT) design constituting of a solid-fluid superlattice (SFSL) coupled with an acoustic grating (AG), which can provide waveform-preserved transmission with very high forward transmission and nearly forbidden backward transmission. The unique feature of waveform preservation of the transmission wave is attributed to the low-frequency diffraction characteristics of the AG together with the extraordinary forbidden transmission of SFSL in a broadband frequency range. Both the frequency range and the beam direction of the transmission wave calculated by using finite element method agree perfectly with the analytical predictions. By investigating the influence of several key parameters, including the angular orientation of the AG unit and the periodicity number of the SFSL, we were able to optimize the SAAT device design, which can increase the energy forward transmission up to 60% without waveform distortion, and the reverse transmission is nearly f...
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