System-level finite element analysis of piezoelectric energy harvesters with rectified interface circuits and experimental validation
System-level finite element analysis of piezoelectric energy harvesters with rectified interface circuits and experimental validation
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DOI：
10.1016/j.ymssp.2020.107440
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发表时间：
2021-04
影响因子：
8.4
通讯作者：
Feng Qian;Yabin Liao;L. Zuo;Phil Jones
中科院分区：
文献类型：
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作者：
Feng Qian;Yabin Liao;L. Zuo;Phil Jones
有限元法（FEM）已被广泛用于压电能量收集（PEH）系统的数值研究，通过商业有限元（FE）包或专门开发的FE公式。有限元法作为一种方便的计算工具，可以处理高度复杂的系统，并已发展成为一种多相耦合的工程问题的解决方案。然而，大多数的FE包和配方是有限的耦合场模拟PEH系统连接到一个线性电路。另一方面，整流电路是实际应用中的关键部件，因为诸如无线传感器节点和可穿戴电子设备等电子设备需要直流电源。基于等效阻抗分析，本文提出了一种通过等效线性电路对具有标准AC-DC接口电路的压电能量采集器进行耦合场研究的方法。所提出的方法使FE包和配方分析，设计和优化PEH收割机在系统级，通过增加模拟整流电路的能力，或减少非线性电路接口模拟到一个更快，更稳定的线性模拟，可以更方便地解决。将等效线性电路法应用于一个矩形双晶片束流收集器，并进行了实验验证。结果也匹配以及从系统级的分析方法获得的。作为一个应用实例，进行了比较研究之间的矩形和三角形能量采集器使用FE包和建议的等效电路，给定相同的固有频率和材料体积。此外，还简要概述和讨论了该方法在FE公式中的实施。
The finite element method (FEM) has been widely used for numerical studies of piezoelectric energy harvesting (PEH) systems, through commercial finite element (FE) packages or specially developed FE formulations. As a convenient computational tool, FEM can deal with systems of high complexity and has evolved into a multiphasic solution to coupled problems in engineering. However, most of FE packages and formulations are limited to coupled-field simulations of PEH systems connected with a linear circuit. On the other hand, rectified circuits are a critical component in practical applications because electronic devices such as wireless sensor nodes and wearable electronics require a DC power supply. Based on the equivalent impedance analysis, this paper proposes a method to enable a coupled-field study of piezoelectric energy harvesters with the standard AC-DC interface circuit through an equivalent linear circuit. The proposed method enables FE packages and formulations to analyze, design, and optimize PEH harvesters at the system level, by either adding the capability of simulating rectified circuits, or reducing a nonlinear circuit interface simulation into a faster and more stable linear simulation that can be solved more conveniently. This equivalent linear circuit method was applied to a rectangular shaped bimorph beam harvester in ANSYS and validated experimentally. The results also match well with those obtained from a system-level analytical approach. As an application example, a comparison study was performed between the rectangular and triangular energy harvesters using FE packages and the proposed equivalent circuit, given the same natural frequency and material volume. In addition, the implementation of this method with FE formulations is briefly outlined and discussed.