Vibration-based piezoelectric energy harvesting technology, characterized by its straightforward structure, has potential applications in powering microelectronic devices. To address the demand for low-frequency energy harvesting performance, a double pendulum piezoelectric energy harvester with stoppers-assisted bending vibration was designed inspired by the bird wing. Its originality is to employ collision to improve the performance of the harvester. A dynamic equivalence-based piezoelectric cantilever beam model was developed to construct the electromechanical coupling dynamic equation for the proposed harvester. Road experimental results investigated the validity of the theoretical model, and the comparisons with existing literature also demonstrated the superiority of the proposed harvester in terms of power density. Then the variation of average power under different resistive loads was analyzed, and the improvement of the presence or absence of stoppers on energy harvesting capacity were discussed to highlight the advantages of collision-induced vibration. Subsequently, a parametric study of the design parameters revealed their impact on the output voltage of the proposed harvester, provided configuration suggestions for optimizing energy harvesting capacity, and explored the potential application scenarios. Furthermore, the current harvester generates an output power of 1.48 mW and a power density of 2.65 W/g/m2 at an acceleration level of 0.3 g. Due to its robust customization, the proposed harvester can achieve an output power of 4.18 mW and a power density of 7.47 W/g/m2 after optimization.

中文翻译：

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一种受鸟翅膀启发的低频双摆压电能量收集器，带有挡块辅助弯曲振动


基于振动的压电能量收集技术以其简单的结构为特点，在为微电子器件供电方面具有潜在的应用价值。为了满足对低频能量收集性能的需求，受鸟翅的启发，设计了一种带有挡块辅助弯曲振动的双摆压电能量收集器。它的独创性是利用碰撞来提高收割机的性能。建立了一种基于动力学等效的压电悬臂梁模型，为所提出的收割机构建了机电耦合动力学方程。道路实验结果检验了理论模型的有效性，与现有文献的对比也证明了所提出的收割机在功率密度方面的优越性。然后分析了不同电阻负载下平均功率的变化，并讨论了有无限位器对能量收集能力的改善，以突出碰撞诱导振动的优势。随后，对设计参数进行参数化研究，揭示了它们对所提出的 Harvester 输出电压的影响，为优化能量收集能力提供了配置建议，并探索了潜在的应用场景。此外，电流采集器在 0.3 g 的加速度水平下可产生 1.48 mW 的输出功率和 2.65 W/g/m2 的功率密度。由于其强大的定制功能，所提出的采集器在优化后可以实现 4.18 mW 的输出功率和 7.47 W/g/m2 的功率密度。