Ning Li, Wang Yi-Ze, Wang Yue-Sheng
Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China.
Department of Mechanics, Tianjin University, Tianjin 300350, China.
J Acoust Soc Am. 2021 Dec;150(6):4343. doi: 10.1121/10.0008974.
Cloaking invisibility is a novel technique that prevents the object from being detected in the background field. The development of new artificial materials and structures promotes the emergence of new achievements in cloaking research. In this work, a broadband square cloaking configuration of elastic wave metamaterial plate is designed and fabricated by the external active control system. The approximate parameters of the flexural wave cloak can be obtained by the coordinate transformation and achieved by alternating layers of the Acrylonitrile Butadiene Styrene (ABS), polydimethylsiloxane (PDMS), and piezoelectric (PZT) patches. With the introduction of active control systems, the square cloak has a wide effective frequency range. The simulation and experimental results show that the square cloak of flexural waves exhibits a good invisible performance in the frequency region of 500-2200 Hz. Compared to the structure without active control systems, the frequency region 2200-2750 Hz is extended for the active cloak. The design and fabrication of the broadband cloak is wished to be helpful during the practical engineering.
隐身衣是一种能防止物体在背景场中被探测到的新技术。新型人工材料和结构的发展推动了隐身研究取得新成果。在这项工作中，通过外部有源控制系统设计并制作了一种弹性波超材料板的宽带方形隐身配置。弯曲波隐身衣的近似参数可通过坐标变换获得，并通过交替层压丙烯腈-丁二烯-苯乙烯（ABS）、聚二甲基硅氧烷（PDMS）和压电（PZT）贴片来实现。随着有源控制系统的引入，方形隐身衣具有较宽的有效频率范围。仿真和实验结果表明，弯曲波方形隐身衣在500 - 2200 Hz频率范围内表现出良好的隐身性能。与没有有源控制系统的结构相比，有源隐身衣的频率范围扩展到了2200 - 2750 Hz。希望宽带隐身衣的设计和制作在实际工程中能有所帮助。
