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Finite Element Modeling and Performance Evaluation of Piezoelectric Energy Harvesters with Various Piezoelectric Unit Distributions

机译：具有各种压电单元分布的压电能收割机有限元建模与性能评价

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摘要

The piezoelectric energy harvester (PEH) is a device for recycling wasted mechanical energy from pavements. To evaluate energy collecting efficiency of PEHs with various piezoelectric unit distributions, finite element (FE) models of the PEHs were developed in this study. The PEH was a square of 30 cm × 30 cm with 7 cm in thickness, which was designed according to the contact area between tire and pavement. Within the PEHs, piezoelectric ceramics (PZT-5H) were used as the core piezoelectric units in the PEHs. A total of three distributions of the piezoelectric units were considered, which were 3 × 3, 3 × 4, and 4 × 4, respectively. For each distribution, two diameters of the piezoelectric units were considered to investigate the influence of the cross section area. The electrical potential, total electrical energy and maximum von Mises stress were compared based on the computational results. Due to the non-uniformity of the stress distribution in PEHs, more electrical energy can be generated by more distributions and smaller diameters of the piezoelectric units; meanwhile, more piezoelectric unit distributions cause a higher electrical potential difference between the edge and center positions. For the same distribution, the piezoelectric units with smaller diameter produce higher electrical potential and energy, but also induce higher stress concentration in the piezoelectric units near the edge.
机译：压电能量收割机（PEH）是一种用于从路面中回收浪费的机械能的装置。为了评估具有各种压电单元分布的PEH的能量收集效率，在本研究中开发了PEHS的有限元（FE）模型。 PEH是30cm×30厘米的平方，厚度为7厘米，根据轮胎和路面之间的接触面积设计。在PEH中，压电陶瓷（PZT-5H）用作PEHS中的核心压电单元。考虑总共三个压电单元分布，分别为3×3,3×4和4×4。对于每个分布，考虑了两个压电单元的直径调查横截面区域的影响。基于计算结果比较了电势，总电能和最大von误析应力。由于PEHS中应力分布的不均匀性，可以通过更多的分布和压电单元的较小直径产生更多电能;同时，更多的压电单元分布在边缘和中心位置之间导致更高的电电位差。对于相同的分布，具有较小直径的压电单元产生较高的电势和能量，而且还产生更高的电位和能量，而且在边缘附近的压电单元中也诱导更高的应力集中。

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