Modeling and experimental verification of a pendulum-based low-frequency vibration energy harvester

Kangqi Fan, Chenyu Wang, Yan Zhang, Jiyuan Guo, Rongchun Li, Fei Wang and Qinxue Tan

Renewable Energy, 2023, vol. 211, issue C, 100-111

Abstract: The pendulum-plucked rotational energy harvester (PP-REH) can realize efficient exploitation of low-frequency vibrations by transforming them to one-way rapid spin of a rotor via a pendulum and a plectrum. A route is conceived in this study to construct the plectrum that can achieve sufficiently large forward stiffness for spinning the rotor and a very small backward stiffness for making the frictional resistance as low as possible. An electromechanical coupling model of the PP-REH is also proposed and verified by experiment to describe the PP-REH dynamic responses. The simulations reveal that the shift of the optimal frequency of the PP-REH with the applied vibration magnitude is due to the large-angle swing of the pendulum. The change of the optimal load resistance is caused by the fact that the power generation unit of the PP-REH is excited indirectly by the exerted vibration, making the electrical damping effect on the PP-REH responses discernible. The proposed electromechanical model can not only predict the PP-REH output performance but also reveal the intriguing phenomena found in the PP-REH dynamics. The model thus can facilitate the design of efficient PP-REHs to achieve high electric outputs from pervasive low-frequency vibrations.

Keywords: Vibration energy harvester; Swing motion; Low-frequency vibration; Electromechanical model (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:211:y:2023:i:c:p:100-111

DOI: 10.1016/j.renene.2023.04.136

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