An arbitrary-shaped acoustic cloak with merits beyond the internal and external cloaks
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- 作者：Baolei Li ; Tinghua Li ; Jun Wu ; Ming Hui ; Gang Yuan ; Yongsheng Zhu
- 关键词：metamaterials ; transformation acoustics ; invisible cloak ; finite element method
- 刊名：Acoustical Physics
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：63
- 期：1
- 页码：45-53
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Acoustics;
- 出版者：Pleiades Publishing
- ISSN：1562-6865
- 卷排序：63
文摘
Based on transformation acoustics, an arbitrary-shaped acoustic cloak capable of functioning as an information exchange-enabling internal cloak and a movement-allowing external cloak is presented. The general expressions of material parameters for the acoustic cloaks with arbitrarily conformal or non-conformal boundaries are derived, and then the performances of developed cloaks are validated by full-wave simulations. Finally, the different characteristics of the linear and nonlinear transformations-based cloaks are compared and analyzed. The proposed cloak could lead to wider applications beyond that of normal cloaks, since it effectively compensates the insufficiencies of traditional internal and external cloaks. Besides, this work also provides a new method to design bifunctional device and suggests an alternative way to make a large object invisible.