Abstract The invisible cloak has attracted great attention due to its significant influences on science and engineering. Active elastic wave metamaterials provide superior controllable characteristics for the flexural wave cloak that is obviously different from the conventional structure. In this work, a broadband flexural wave cloak is designed and fabricated by the coordinate transformation method and active control system. The cloaking configuration consists of 16 alternative concentric layers with the polydimethylsiloxane (PDMS) and piezoelectric (PZT) patches which are connected with the active control systems. The results of the finite element simulations and experiments show that the effective frequency range of the flexural wave cloak with the active control systems is extended from 900 Hz to 1200 Hz. The design and fabrication of the elastic cloak with broadband characteristics have shielding applications.

中文翻译：

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弹性波超材料的主动控制斗篷

摘要 隐形斗篷因其对科学和工程的重大影响而备受关注。有源弹性波超材料为弯曲波斗篷提供了优越的可控特性，明显不同于常规结构。在这项工作中，通过坐标变换方法和主动控制系统设计和制造了一种宽带弯曲波斗篷。隐形配置由 16 个交替的同心层组成，其中聚二甲基硅氧烷 (PDMS) 和压电 (PZT) 贴片与主动控制系统相连。有限元仿真和实验结果表明，采用主动控制系统的弯曲波斗篷的有效频率范围从900 Hz扩展到1200 Hz。