A flute-inspired broadband piezoelectric vibration energy harvesting device with mechanical intelligent design

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]
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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