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

Zhemin Wang, Yu Du, Tianrun Li, Zhimiao Yan and Ting Tan

Applied Energy, 2021, vol. 303, issue C, No S0306261921009533

Abstract: 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.

Keywords: Vibration energy harvesting; Piezoelectric energy harvester; Broadband; Mechanical-intelligent; Self-adjusting; Self-locking (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (7)

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DOI: 10.1016/j.apenergy.2021.117577

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