Shi Rui, Chen Jiawei, Ma Tianbing, Li Changpeng, Zhang Wenjie, Ye Dongdong
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232000, China.
College of Mechanical Engineering, Anhui University of Science and Technology, Huainan 232000, China.
Rev Sci Instrum. 2024 Jun 1;95(6). doi: 10.1063/5.0206110.
In light of the limitations of the current piezoelectric energy harvesters and the demand for self-power supply in wireless sensor nodes, a novel positive feedback piezoelectric energy harvester based on nonlinear magnetic coupling is proposed. The operational characteristics of this energy harvester are investigated from three perspectives: theory, simulation, and experiment. First, a nonlinear electromechanical coupling mathematical model that describes the dynamic response of the energy harvester system is established by combining the Hamilton variational principle with the piezoelectric theory. This provides a theoretical foundation for subsequent research. Second, finite element method simulations are employed to optimize the structural parameters of the energy harvester and study the impact of nonlinear magnetic force on its output performance. Finally, an experimental prototype is fabricated and an experimental test system is constructed to validate the designed positive feedback piezoelectric energy harvester. The results demonstrate that changes in the longitudinal beam angle have minimal effect on energy capture efficiency. By appropriately increasing the bending surface length, reducing initial magnetic moment, and augmenting mass block weight, wider working frequency bands and higher power generation capacity can be achieved when vibrating in low-energy orbits. The experimental findings align closely with theoretical design values and contribute to advancing broadband multi-directional piezoelectric energy harvesting technology in order to provide high-performance vibration-based power solutions for wireless applications.
鉴于当前压电能量采集器的局限性以及无线传感器节点对自供电的需求，提出了一种基于非线性磁耦合的新型正反馈压电能量采集器。从理论、仿真和实验三个角度研究了这种能量采集器的运行特性。首先，通过将哈密顿变分原理与压电理论相结合，建立了描述能量采集器系统动态响应的非线性机电耦合数学模型。这为后续研究提供了理论基础。其次，采用有限元方法仿真来优化能量采集器的结构参数，并研究非线性磁力对其输出性能的影响。最后，制作了实验原型并构建了实验测试系统，以验证所设计的正反馈压电能量采集器。结果表明，纵向梁角度的变化对能量捕获效率的影响最小。通过适当增加弯曲表面长度、减小初始磁矩以及增加质量块重量，在低能量轨道振动时可以实现更宽的工作频段和更高的发电能力。实验结果与理论设计值密切吻合，有助于推动宽带多向压电能量采集技术的发展，以便为无线应用提供基于振动的高性能电源解决方案。
