长笛
能量收集
振动
压电
机械振动
声学
宽带
工程类
机械能
电气工程
计算机科学
能量(信号处理)
材料科学
机械工程
功率(物理)
物理
电信
量子力学
作者
Zhemin Wang,Yu Du,Tianrun Li,Zhimiao Yan,Ting Tan
出处
期刊:Applied Energy
[Elsevier BV]
日期:2021-08-24
卷期号:303: 117577-117577
被引量:46
标识
DOI:10.1016/j.apenergy.2021.117577
摘要
Currently, the practicability of vibration energy harvesting devices is restricted by narrow resonant bandwidths. To realize broadband, high-efficiency vibration energy harvesting, here we propose a flute-inspired mechanical-intelligent piezoelectric energy harvester to achieve self-tracking vibration frequency without manual interventions. This harvester adjusts its natural frequency in a way reminiscent of how the tone of a flute is altered (i.e., by moving a sliding mass on the longitudinal arranged hole of a cantilever beam). The mechanical intelligence is reflected in self-tuning and self-locking following its dynamic responses. The natural frequency of the proposed device approaches the external excitation frequency by self-tuning, and the resonant state is stably maintained by self-locking. Comparison experiments with its linear counterpart, this flute-inspired mechanical-intelligent vibration energy harvester demonstrates a significant improvement of 610% in working bandwidth and an increase in power of 348%. Compared with the tunable beam-slider structure without mechanical-intelligence, the proposed energy harvester shows 235% increasing in operating bandwidth and 659% increasing in working efficiency. Practical applications of powering an electronic clock and charging a capacitor show the feasibility of this energy harvester used for the engineering community. This study provides a mechanical-intelligent design approach for piezoelectric vibration energy harvester, which may also be applied to other vibration energy harvesters using electromagnetic, triboelectric or hybrid transductions. • This flute-inspired device realizes broadband vibration energy harvesting. • This harvester possesses both self-tuning and self-locking abilities. • Self-tuning widens bandwidth and self-locking enhances performance. • The superiority of mechanical-intelligent is verified by various vibration forms. • Mechanical-intelligent design enhances 659% power and widens 610% bandwidth.
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