Electromechanical analysis of a bending-torsion coupling piezoelectric energy harvester

Taotao Zhang, Linda Wang, Wende Liu
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Abstract

Piezoelectric energy harvester devices have been widely used for collection of the vibration energy. Especially, the cantilever structure has been extensively studied to optimizing its energy harvesting performance. In this paper, a new type of bending torsion coupled piezoelectric energy harvester is proposed with the combination of the elastic connection and the optimized design of the eccentric mass. The energy harvesting performance under indirect impact load is analyzed by the theory of mechanical vibration and Hamiltonian principle. The geometry effect of the tip mass is investigated. The theoretical calculation method is verified by comparison with the finite element method. The results show that reasonable resistance selection and the frequency matching of the main structure and the energy capture structure will significantly change the energy harvesting effect. The frequency matching of the structures can be optimized by improving the eccentric arrangement. It is demonstrated that the proposed structure of the piezoelectric energy harvester has better energy harvesting efficiency as compared with the traditional structures.
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弯曲扭转耦合压电能量收集器的机电分析
压电能量收集装置已被广泛应用于振动能量的收集。特别是悬臂结构,为了优化其能量收集性能,已经得到了广泛的研究。本文提出了一种将弹性连接与偏心质量优化设计相结合的新型弯曲扭转耦合压电能量采集器。利用机械振动理论和哈密顿原理分析了间接冲击载荷下的能量收集性能。研究了尖端质量的几何效应。通过与有限元法的对比,验证了理论计算方法的正确性。结果表明,合理的电阻选择和主结构与能量捕获结构的频率匹配将显著改变能量收集效果。通过改进偏心布置,可以优化结构的频率匹配。实验表明,与传统结构相比,所提出的压电能量收集器结构具有更好的能量收集效率。
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