Journal
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume 202, Issue -, Pages 126-135Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2020.06.009
Keywords
Active control; Negative capacitance circuits; Elastic wave metamaterials; Thin plates; Flexural wave cloak
Categories
Funding
- National Natural Science Foundation of China [11922209, 11991031]
- Joint Sino-German Research Project [GZ 1355]
- German Research Foundation (DFG) [ZH 15/27-1]
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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. (C) 2020 Elsevier Ltd. All rights reserved.
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