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Author: search.filters.author.Panthongsy, PhosyHas files: No

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    Design and evaluation of double-stage energy harvesting floor tile
    (2019-10-01)
    Isarakorn, Don
    ;
    Jayasvasti, Subhawat
    ;
    Panthongsy, Phosy
    ;
    Janphuang, Pattanaphong
    ;
    Hamamoto, Kazuhiko
    This paper introduces the design and characterization of a double-stage energy harvesting floor tile that uses a piezoelectric cantilever to generate electricity from human footsteps. A frequency up-conversion principle, in the form of an overshooting piezoelectric cantilever, plucked with a proof mass is utilized to increase energy conversion efficiency. The overshoot of the proof mass is implemented by a mechanical impact between a moving cover plate and a stopper to prevent damage to the plucked piezoelectric element. In an experiment, the piezoelectric cantilever of a floor tile prototype was excited by a pneumatic actuator that simulated human footsteps. The key parameters affecting the electrical power and energy outputs were investigated by actuating the prototype with a few kinds of excitation input. It was found that, when actuated by a single simulated footstep, the prototype was able to produce electrical power and energy in two stages. The cantilever resonated at a frequency of 14.08 Hz. The output electricity was directly proportional to the acceleration of the moving cover plate and the gap between the cover plate and the stopper. An average power of 0.82 mW and a total energy of 2.40 mJ were obtained at an acceleration of 0.93 g and a gap of 4 mm. The prototype had a simple structure and was able to operate over a wide range of frequencies.
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    Performance and behavior analysis of piezoelectric energy harvesting floor tiles
    (2019-07-01)
    Panthongsy, Phosy
    ;
    Isarakorn, Don
    ;
    Hamamoto, Kazuhiko
    ;
    Janphuang, Pattanaphong
    This paper presents the performance and behavior analysis of two unlike piezoelectric energy harvesting floor tiles in which they are functioned with different frequency up-conversion strategies to achieve the high energy conversion efficiency from low and variable-frequency vibration as the human footstep. One of such strategies is to convert the frequency of piezoelectric bimorph up through the magnetic interaction between a permanent magnet and an iron plate, while another one is achieved on that through the mechanical impact between a cover plate and a wall of the floor tile. Experimentally, the floor tiles having one piezoelectric bimorph inside of them are prototyped and then mounted to their individual input-exciting kit to investigate the energy harvesting performance. The input-exciting kits are employed to simulate the human footstep on floor tiles. The results show that the floor tile with frequency up-converting mechanism based on mechanical impact should be a better option for energy harvesting from human footstep due to the low-profile structure and good energy harvesting performance. Moreover, its operational way can result in long-lasting piezoelectric bimorph. When a cover plate is actuated to move down with the velocity of 54.13 mm/s and then released, the floor tile can produce the average power of 0.82 mW at load resistance approximately of 55.68 kΩ.
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    Fabrication and evaluation of energy harvesting floor using piezoelectric frequency up-converting mechanism
    (2018-08-15)
    Panthongsy, Phosy
    ;
    Isarakorn, Don
    ;
    Janphuang, Pattanaphong
    ;
    Hamamoto, Kazuhiko
    This paper reports on the fabrication and evaluation of an energy harvesting floor tile using unimorph PZT piezoelectric cantilevers to convert kinetic energy from human footsteps into usable electricity. The operation of the tile is based on frequency up-converting mechanism in which low frequency input vibrations are converted into high frequency vibrations of an electromechanical transduction. The operational frequency of the PZT unimorph cantilever was converted up by an interaction between a permanent magnet and an iron bar. Vertical displacement of the oscillating cantilever was localized with a stopper preventing damage to the piezoelectric layer from shock or over-displacement excitation. The magnetic field density between the magnet and the iron bar was investigated through finite element analysis simulation in order to define an optimal air gap. Experimentally, a unimorph PZT cantilever was initially prototyped to validate the design. The results showed a successful frequency up-conversion with a resonant frequency of 10.54 Hz. Then, it was scaled up by accommodating 24 unimorph PZT cantilevers followed by experimental validation to evaluate its energy harvesting performance. Each cantilever was connected to a full wave bridge rectifier then connected in parallel with the other cantilevers. The generated electrical power and energy were investigated through various resistive loads. The average power and total output energy produced by one foot step on the tile were found to be 1.24 mW and 3.49 mJ, respectively at an optimal load resistance of 74.44 kΩ. The energy conversion efficiency reached 17.12% demonstrating the potential of harvesting energy from human motion.
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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>.
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    Piezoelectric energy harvesting from machine vibrations for wireless sensor system
    (2015-08-17)
    Panthongsy, Phosy
    ;
    Isarakorn, Don
    ;
    Sudhawiyangkul, Thapanun
    ;
    Nundrakwang, Songmoung
    In recent years, wireless sensor network is used in a variety of applications and highly required. These wireless sensor network is powered by the battery with limit energy. Therefore, the integration of energy harvester and wireless sensor network has received more attention because it can prolong the lifetime of battery in a sensor node. The focus of this paper is to design the energy harvesting device from machine vibrations for wireless sensor node, which the amplitude and frequency of vibration source were contributed on the design. The structure of energy harvesting devices is a resonant type piezoelectric energy harvester with a proof mass at the tip of the beam for tuning its resonant frequency. The proposed piezoelectric energy harvesters were then designed and analyzed by using Finite Element Method (FEM) to optimize the natural frequency of the harvester. Then, the prototype energy harvesters were made and mounted to a vibration source for experiments. The result reveals that the optimal piezoelectric energy harvester can generate the output power of 82.29 μW at the resonant frequency of 50 Hz.