期刊
JOURNAL OF SOUND AND VIBRATION
卷 491, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2020.115738
关键词
Acoustic metamaterials; Piezoelectric shunting; Lateral electric field; Resistance-tuning characteristics
资金
- National Natural Science Foundation of China [11772163, 11372146, 11672142, 11672141]
- Ningbo Municipal Bureau of Science and Technology [2019B10122]
- Marine Biotechnology and Marine Engineering Discipline Group in Ningbo University
This study improves the resistance-tuning characteristics of metamaterial beams by applying piezoelectric unit cells with a lateral electric field (LEF), resulting in better vibration attenuation properties. LEF resonators exhibit stronger piezoelectric coupling and can maintain better vibration attenuation properties when the bandgap width is broadened.
Metamaterials with piezoelectric shuntings have convenient tunability. The increase in the resistance value in the shunting circuit can broaden the bandgap width but lower the vibration attenuation ability. In this study, a piezoelectric unit cell with a lateral electric field (LEF) is applied to a metamaterial beam to improve the resistance-tuning characteristics. The effective stiffness and bandgaps were calculated by using a theoretical method and verified by three-dimensional numerical simulations. Compared with resonators with a thickness electric field, LEF resonators have a stronger piezoelectric coupling, and the extra transferred energy of LEF resonators is reflected in the greater vibration attenuation depth when the increasing degrees of the bandgap widths of the two cases are similar. Therefore, the LEF metamaterial beam exhibits better resistance-tuning characteristics; namely, it can maintain better vibration attenuation properties when the bandgap width is broadened by increasing the resistance value. (C) 2020 Elsevier Ltd. All rights reserved.
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