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An ultrathin acoustic carpet cloak based on resonators with extended necks
Journal of Physics D: Applied Physics ( IF 3.4 ) Pub Date : 2020-09-28 , DOI: 10.1088/1361-6463/abac2e
Jingwen Guo 1 , Jie Zhou 2
Affiliation  

By employing a set of resonators with extended necks, an ultrathin acoustic carpet cloak with a thickness of about 1/30th of the operation wavelength is proposed to achieve effective cloaking around a bump at 1000 Hz. The cloak is composed of a periodic array of supercells. The supercell is constructed by a solid unit and seven inhomogeneous resonators with different extended necks. The elements in the supercell are capable of achieving distinct phase shifts ranging from 0 to 2 π in a phase increment of π /4. To demonstrate the effectiveness of the cloak, both normal incidence and oblique incidence (incident angle equals to 30 ° ) plane waves impinging on a cloaked triangular bump are investigated numerically and validated experimentally. The results show that it is possible to conceal the bump by wrapping over the surface of the bump through using the proposed ultrathin carpet cloak. As a resonant-element based acoustic device, the cloak exhibits invisibili...

中文翻译:

一种超薄的声学地毯斗篷,基于带有延伸颈部的谐振器

通过使用一组具有延伸的颈部的谐振器,提出了厚度约为工作波长的1/30的超薄声学地毯披风,以实现在1000 Hz处围绕凸点的有效披风。斗篷由超级细胞的周期性阵列组成。超级单元由一个固态单元和七个具有不同延伸颈的不均匀谐振器构成。超级单元中的元素能够以π/ 4的相位增量实现从0到2π的明显相移。为了证明这种隐身衣的有效性,对入射在隐身三角形凸块上的法向入射角和斜入射角(入射角等于30°)进行了数值研究,并进行了实验验证。结果表明,通过使用提出的超薄地毯披风包裹在凸块的表面上,可以隐藏凸块。作为基于共振元素的声学设备,斗篷具有隐蔽性。
更新日期:2020-09-29
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