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Nonlinear dynamics and energy harvesting characteristics of a magnetically coupled dual-cantilever piezoelectric energy harvester

Author

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  • Dong, Xiaoxiao
  • Yang, Guang
  • Cheng, Linfeng
  • Xia, Bo
  • Yuan, Yue

Abstract

Piezoelectric energy harvesting, as an emerging self-powered technology, has facilitated the widespread deployment of wireless sensor networks (WSNs) within the Internet of Things (IoT). However, conventional piezoelectric energy harvesters (PEHs) suffer from limited bandwidths and insufficient output power under low-frequency vibration environments. To address these challenges, this study proposes a magnetically coupled dual-cantilever PEH. A two-degree-of-freedom magnetic potential model is developed to characterize the dual-beam configuration, and a distributed electro-magneto-mechanical coupling model is subsequently derived to investigate the nonlinear dynamic behavior of the PEH system. Additionally, a barrier-height tuning mechanism is proposed to lower the excitation threshold for large-amplitude oscillations, thereby enhancing the output performance. Experimental results show that, under an acceleration of 3 m/s2, the proposed harvester achieves the first and second resonant frequencies of 5.4 Hz and 15.5 Hz, with an output power of 8.93 mW and a bandwidth of 7.4 Hz. By leveraging the synergistic interaction between multimodal vibrations and magnetic nonlinearity, the harvester effectively enhances both output power and bandwidth in low-frequency environments.

Suggested Citation

  • Dong, Xiaoxiao & Yang, Guang & Cheng, Linfeng & Xia, Bo & Yuan, Yue, 2025. "Nonlinear dynamics and energy harvesting characteristics of a magnetically coupled dual-cantilever piezoelectric energy harvester," Energy, Elsevier, vol. 341(C).
    • Handle: RePEc:eee:energy:v:341:y:2025:i:c:s0360544225050145
    DOI: 10.1016/j.energy.2025.139372
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    References listed on IDEAS

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