Broadband unidirectional acoustic transmission based on piecewise linear acoustic metamaterials
Broadband unidirectional acoustic transmission based on piecewise linear acoustic metamaterials
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DOI：
10.1007/s11434-014-0463-7
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发表时间：
2014-06
影响因子：
--
通讯作者：
Sai Zhang;Yu Zhang
中科院分区：
文献类型：
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作者：
Sai Zhang;Yu Zhang
本文提出了一种基于径向分段线性声速分布的非均匀超材料壳体的宽带单向声传输。在极坐标系下，利用几何声学理论推导了壳体内外入射的声射线，说明了声传播的单向性。数值全波模拟表明，单向传输在很宽的频率范围内具有强度无关的单向传输特性。最后，利用多层材料设计并仿真了该单向传输模型的实现方案，指出了其在噪声控制、声整流器、波吸收等相关领域的潜在应用。
In this paper, a broadband unidirectional acoustic transmission based on inhomogeneous metamaterial shell with radial piecewise linear sound speed distribution is proposed. Acoustic rays in the case of external and internal incidences from the shell are deduced by geometric acoustic theory to show the unidirectional acoustic propagation in the polar coordinate system. Numerical full-wave simulations reveal that one way transmission has the intensity-independent unidirectional transmission feature over a wide frequency range. Finally, a scheme for realization of the proposed one way transmission model is designed and simulated by using multilayered materials, suggesting its potential applications in noise control, acoustic rectifiers, wave absorption and related fields.