Finite Element Analysis and Optimization of the Piezoelectric Circular Diaphragm Energy Harvester

Abstract:

The effectiveness of power generation of the piezoelectric energy harvester (PEH) depends on the coupling between its resonant frequency and the oscillation frequency of the vibration source. The resonant frequency of a PEH is determined by its structural design, and therefore, to improve piezoelectric energy harvester performance, the piezoelectric energy harvester must be optimally designed to achieve the resonant frequency that matches the excitation frequency of the vibration source. This paper presents the design and detailed calculation of the piezoelectric energy harvester in the form of a bimorph piezoelectric circular diaphragm (PCD) structure by finite element analysis (FEA) using the software package ANSYS. Based on analyses and calculations, the optimal structure of the piezoelectric circular diaphragm energy harvester is proposed to meet the specified resonant frequency response matching the vibration source frequency. Detailed calculations of the PEH were performed with an excitation frequency of 100 Hz. With an optimal load resistor of 10.1 kΩ, an output power of 0.287 W was generated at 100 Hz (equal to the resonant frequency of the PEH) under an amplitude of harmonic excitation of 0.1mm. In addition, the research results can be used to fabricate piezoelectric circular diaphragm energy harvester operating at a resonant frequency suitable for the available vibrations.

• Periodical: Applied Mechanics and Materials (Volume 922)
• Pages: 111-121
• DOI: https://doi.org/10.4028/p-MboGV9
• Online since: August 2024
• Authors: Van Duong Le*
• Keywords: Finite Element Analysis (FEA), Optimization, Piezoelectric Circular Diaphragm (PCD), Piezoelectric Energy Harvester (PEH), Resonant Frequency

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