A novel soft encapsulated multi-directional and multi-modal piezoelectric vibration energy harvester

被引:9
|
作者
Cao, Dong-Xing [1 ,2 ]
Lu, Yi-Ming [1 ,2 ]
Lai, Siu-Kai [3 ,4 ]
Mao, Jia-Jia [1 ,2 ]
Guo, Xiang-Ying [1 ,2 ]
Shen, Yong-Jun [5 ,6 ]
机构
[1] Beijing Univ Technol, Fac Mat & Mfg, Beijing 100124, Peoples R China
[2] Beijing Key Lab Nonlinear Vibrat & Strength Mech S, Beijing 100124, Peoples R China
[3] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China
[4] Hong Kong Polytech Univ, Natl Rail Transit Electrificat & Automat Engn Tech, Hong Kong Branch, Hong Kong, Peoples R China
[5] Shijiazhuang Tiedao Univ, State Key Lab Mech Behav & Syst Safety Traff Engn, Shijiazhuang 050043, Peoples R China
[6] Shijiazhuang Tiedao Univ, Shijiazhuang 050043, Peoples R China
基金
中国国家自然科学基金;
关键词
Vibration energy harvesting; Mechanically-guided assembly; Soft encapsulation; Multiple directions; Wide bandwidth; WIRELESS SENSOR NETWORKS; LOW-FREQUENCY;
D O I
10.1016/j.energy.2022.124309
中图分类号
O414.1 [热力学];
学科分类号
摘要
Advances in the design of various piezoelectric vibration-based energy harvesters (PVEHs), as a kind of power devices that can convert ambient energy to useable electrical energy, have become a hot topic in recent years due to their potential perspectives in wireless sensor networks, wearable electronics and low-power microelectronics. Unfortunately, conventional PVEHs modelled by beam- or plate-type planar structures are mainly restricted to harness kinetic energy in a single direction only. However, ambient vibration sources often work in multiple directions and broadband frequencies. To address this challenging problem, a mechanically-guided three-dimensional (3D) assembly structure is strategically designed to construct a soft cruciform-encapsulated PVEH in this work. Meanwhile, a reliable soft encapsulation technology is introduced to maintain the 3D configuration, which not only can avoid the collapse problem and also improve the dynamical performance. The entire system consists of a compressive buckling cruciform structure with a proof mass, PVDF thin film, and soft encapsulation. The dynamic characteristics of the system can be adjusted by changing the structural parameters, such as the pre-stressing force of the pre-stretched elastic substrate and the quality of the additional mass block. Finite element analysis and experimental studies are conducted to investigate the modal characteristics of system. A comparison of the vibration energy harvesting performance between the encapsulated and unencapsulated piezoelectric harvesters is presented. The results demonstrate that the encapsulated one can work well under multi-directional, multi-modal and low-frequency conditions. A maximum power output of 9.8 mW in the frequency range of 1e20 0 Hz can be achieved, which is almost 560 times more than that of the unencapsulated one. The proposed methodology also offers a new perspective for the fabrication design of soft-type PVEHs with higher working performance.(c) 2022 Elsevier Ltd. All rights reserved.
引用
收藏
页数:11
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