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<p>Vibration energy harvesters can transform ambient mechanical vibration into electrical energy, which can then be utilized to power microelectronic devices such as IoT sensors. Inspired by the bidirectional bending mechanism of the flytrap’s blades, prestress is incorporated into the magnetostrictive harvester to transform it into a bistable structure. This enhancement aims to significantly improve the system’s output capacity. To further advance the research on prestressed magnetostrictive bistable vibration harvesters, this study proposes novelty the motion model of the magnetostrictive bistable vibration harvester and the mechanomagnetoelectric coupling model, along with their numerical solutions. A series of accurate values, such as the end displacement of the system, the stress of Galfenol and the induced voltage, were obtained. The curvature characteristics and nonlinear behaviors of the harvester system were analyzed via the finite element method. Eventually, the working capability of the prototype was tested through experiments. The results indicate that the working frequency band of the system is evidently widened. When the excitation frequency is 10&#xa0;Hz and the acceleration is 3.16&#xa0;g, the large-amplitude periodic inter-well vibration can persist from 8.5&#xa0;Hz to 11.5&#xa0;Hz, and the maximum generated power is 6.64 mW. These findings fully demonstrate the application potential of the proposed bio-inspired bistable harvester in low-frequency broadband vibration energy harvesting.</p>

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Mathematical model of magnetostrictive bistable wideband harvester based on bionic mechanism of flytrap

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Jiaqi Ma,
  • Huifang Liu,
  • Luyao Zhao,
  • Linru Wei,
  • Wencheng Li

摘要

Vibration energy harvesters can transform ambient mechanical vibration into electrical energy, which can then be utilized to power microelectronic devices such as IoT sensors. Inspired by the bidirectional bending mechanism of the flytrap’s blades, prestress is incorporated into the magnetostrictive harvester to transform it into a bistable structure. This enhancement aims to significantly improve the system’s output capacity. To further advance the research on prestressed magnetostrictive bistable vibration harvesters, this study proposes novelty the motion model of the magnetostrictive bistable vibration harvester and the mechanomagnetoelectric coupling model, along with their numerical solutions. A series of accurate values, such as the end displacement of the system, the stress of Galfenol and the induced voltage, were obtained. The curvature characteristics and nonlinear behaviors of the harvester system were analyzed via the finite element method. Eventually, the working capability of the prototype was tested through experiments. The results indicate that the working frequency band of the system is evidently widened. When the excitation frequency is 10 Hz and the acceleration is 3.16 g, the large-amplitude periodic inter-well vibration can persist from 8.5 Hz to 11.5 Hz, and the maximum generated power is 6.64 mW. These findings fully demonstrate the application potential of the proposed bio-inspired bistable harvester in low-frequency broadband vibration energy harvesting.