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<p>Traditional contact-based piezoelectric energy harvesters often experience increased wear and reduced lifespan due to frequent mechanical contact under high-frequency rotational conditions, leading to diminished output power. To overcome these limitations, this paper proposes a novel non-contact collision-induced self-vibration piezoelectric energy harvester. By utilizing non-contact collisions between the rotating component and the impact pin, the harvester induces self-vibration in the piezoelectric ceramics, effectively avoiding the mechanical wear and stress concentration inherent in traditional contact designs. A theoretical model was developed, and a simulation model was constructed in Simulink to investigate the effects of key parameters, including impact pin mass, pin spring stiffness, torsion spring stiffness, and rotational radius. Based on these studies, innovative measures were proposed and validated. Experimental tests utilizing a single piezoelectric ceramic beam with a collision-induced self-vibration mechanism were conducted to evaluate the performance of individual piezoelectric elements. Additionally, the influence of multi-element structures was analyzed. The non-contact collision design significantly reduced mechanical stress and localized stress concentrations in the piezoelectric material. Weibull analysis confirmed that the non-contact design effectively extended the lifespan of piezoelectric ceramics. Utilizing the self-vibration mechanism induced by angular velocity differences, the novel harvester achieved an output energy of 2.65&#xa0;mJ per single piezoelectric ceramic at 300&#xa0;r/min, with output power significantly surpassing that of traditional contact-based designs. Modular designs incorporating multiple piezoelectric ceramics further enhanced power generation capacity. Both experimental and simulation data were collected using a single piezoelectric ceramic to ensure the comparability between the novel device and traditional designs. Results demonstrated that the proposed harvester exhibits longer lifespan and higher efficiency in high-frequency rotational environments, showcasing its broad application potential in efficient mechanical energy harvesting.</p>

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High output and durable piezoelectric energy harvesting system utilizing non-contact collision-induced self-vibration mechanism

  • 期刊论文

  • 发表日期：

    2025年4月26日

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  • Zewang Wu,
  • Yunchao Wang,
  • Qi Hong,
  • Haoyu Sun,
  • Shaobin Lin

摘要

Traditional contact-based piezoelectric energy harvesters often experience increased wear and reduced lifespan due to frequent mechanical contact under high-frequency rotational conditions, leading to diminished output power. To overcome these limitations, this paper proposes a novel non-contact collision-induced self-vibration piezoelectric energy harvester. By utilizing non-contact collisions between the rotating component and the impact pin, the harvester induces self-vibration in the piezoelectric ceramics, effectively avoiding the mechanical wear and stress concentration inherent in traditional contact designs. A theoretical model was developed, and a simulation model was constructed in Simulink to investigate the effects of key parameters, including impact pin mass, pin spring stiffness, torsion spring stiffness, and rotational radius. Based on these studies, innovative measures were proposed and validated. Experimental tests utilizing a single piezoelectric ceramic beam with a collision-induced self-vibration mechanism were conducted to evaluate the performance of individual piezoelectric elements. Additionally, the influence of multi-element structures was analyzed. The non-contact collision design significantly reduced mechanical stress and localized stress concentrations in the piezoelectric material. Weibull analysis confirmed that the non-contact design effectively extended the lifespan of piezoelectric ceramics. Utilizing the self-vibration mechanism induced by angular velocity differences, the novel harvester achieved an output energy of 2.65 mJ per single piezoelectric ceramic at 300 r/min, with output power significantly surpassing that of traditional contact-based designs. Modular designs incorporating multiple piezoelectric ceramics further enhanced power generation capacity. Both experimental and simulation data were collected using a single piezoelectric ceramic to ensure the comparability between the novel device and traditional designs. Results demonstrated that the proposed harvester exhibits longer lifespan and higher efficiency in high-frequency rotational environments, showcasing its broad application potential in efficient mechanical energy harvesting.