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Author: search.filters.author.Isarakorn, DonSubject: search.filters.subject.Finite element analysis

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    A test bench for characterization of piezoelectric frequency up-converting energy harvesters
    (2018-07-02)
    Panthongsy, Phosy
    ;
    Isarakorn, Don
    ;
    Hamamoto, Kazuhiko
    This work focuses on the design and realization of a test bench used to characterize the performances of the piezoelectric cantilever for frequency up-converting energy harvesters. A test bench is completed by combining a frequency up-converter with an oscilloscope (Tektronix TD 3032B). The frequency up-conversion mechanism achieves the excitation on a piezoelectric cantilever through an interaction between a permanent magnet and an iron bar. In the mechanism design, the air gap between a permanent magnet and an iron bar is analyzed by Finite Element Method (FEM). After the design is verified, a test bench is fabricated and then validated with experimental study by testing the performances of a PZT-5H bimorph (T220-H4-503X, Piezo Systems, Inc.); the considered performances are resonant frequency, average output power, total output energy and energy conversion efficiency. The experimental results demonstrate that a fabricated test bench is satisfactory.
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    Comparative study of piezoelectric energy harvesters based on polycrystalline PZT and single-crystalline PMN-PT materials
    (2016-09-06)
    Panthongsy, Phosy
    ;
    Isarakorn, Don
    The piezoelectric energy harvester for supplying power to low-power electronic devices, especially low-power wireless sensor node has been studied and received more attraction over the past decade. In order to simplify installation and obtain the sufficient power for systems, the harvester possessing simple structure with highest output power is highly required. The aim of this study is to design and compare the characteristic and performance of piezoelectric polycrystalline PZT and single-crystalline PMN-PT energy harvesters based on unimorph configuration. By utilizing ANSYS<sup>®</sup> for finite element analysis (FEA), the numerical model of composite piezoelectric unimorph generators with proof mass exciting at resonant frequency 150 Hz are designed and then fabricated. For the energy harvesting experiment, the prototypes of harvesters are mounted to the electromagnetic shaker and inputted the vibration with vary frequencies and accelerations. As the results, the piezoelectric single-crystalline PMN-PT unimorph energy harvester has the higher energy density which is 352.85 J/gm<sup>3</sup>, while the piezoelectric polycrystalline PZT unimorph energy harvester has 8.44 J/gm<inf>3</inf>.