期刊
NANO ENERGY
卷 103, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107823
关键词
Bistable energy harvester; Surface mechanical attrition treatment; Local bistable nanoplate; Vibration test; Numerical simulation; Nonlinear dynamic characteristics
类别
资金
- Guangdong Provincial Department of Science and Technology [2020B090923002]
- Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone Shenzhen Park Project [HZQB-KCZYB- 2020030]
- Regional Science and Technology Cooperation Program of Changsha Science and Technology Project [kh2201029]
- Major Program of Changsha Science and Technology Project [kh2003023]
- Hong Kong Innovation and Technology Commission via the Hong Kong Branch of National Precious Metals Material Engineering Research Center
- JLFS-RGC-joint Laboratory Funding Scheme [JLFS/E- 103/18]
A bionic metallic nanomaterial-based bistable piezoelectric energy harvester is developed in this study, inspired by the structure of soybean pods. The harvester shows increased voltage output and working bandwidth in intermittent and continuous cross-well vibration modes.
Bistable nonlinear energy harvesters are effective structures for scavenging broadband energy from frequency -varying vibration sources. The bistable characteristic of such structures is typically induced by introducing magnetic fields, prestress, and nonuniform geometries or fixtures. However, the complicated structures or single deformation modes of these structures limit their practical application. Inspired by the structure of soybean pods, a bionic metallic nanomaterial-based bistable piezoelectric energy harvester is developed in this study. The nanoplate substrate with a local bistable region mimics the configuration of a soybean pod. To the best of the authors' knowledge, the local bistable configuration represents a novel energy harvesting strategy. The local bistable nanoplate is fabricated using a mature surface mechanical attrition treatment technique that generates a gradient nanostructure to enhance the mechanical properties of the bistable structure. The energy harvesting performance and nonlinear dynamic characteristics of the energy harvester are evaluated through frequency -sweep and fixed-frequency vibration tests and numerical simulations with a new two-step finite element (FE) model. The harvester characteristics in three vibration modes (single-well vibration (SV), intermittent cross-well vibration (ICV), and continuous cross-well vibration (CCV)) are discussed. The experimental and numerical re-sults demonstrate that the voltage output and working bandwidth of the proposed harvester increase by five times in the ICV and CCV modes when the excitation acceleration increases from 0.5 g to 3.0 g. The bionic nanomaterial-based bistable piezoelectric energy harvester can be potentially used in various applications such as vehicle suspension systems, tires, and vehicle-bridge systems.
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