Associate for Education and Public Outreach

小野田 淳次郎

オノダ ジュンジロウ  (Junjiro Onoda)

基本情報

所属
国立研究開発法人宇宙航空研究開発機構 宇宙科学研究所 名誉教授
学位
工学博士(東京大学)

researchmap会員ID
1000144488

研究キーワード

 2

委員歴

 2

論文

 120
  • Junjiro Onoda, Kenji Minesugi, Seong-Cheol Kwon, Hyun-Ung Oh
    Smart Materials and Structures 30(6) 065014-065014 2021年6月1日  査読有り
    Abstract We propose and demonstrate a novel method to enhance vibration harvesting based on surge-induced synchronized switch harvesting on inductor (S3HI). S3HI allows harvesting of a large amount of energy even from low-amplitude vibrations by inducing a surge voltage during the voltage inversion of a synchronized switch harvesting on inductor (SSHI). The surge voltage and the voltage amplification from the conventional voltage inversion improve energy harvesting. S3HI modifies SSHI by both rewiring the circuit without adding components and using a novel switching pattern for voltage inversion, thus maintaining the simplicity of SSHI. We propose a novel switching strategy and circuit topology and analyze six methods that constitute the S3HI family, which includes traditional S3HI and high-frequency S3HI. We demonstrate that the six methods suitably harvest energy even from low-amplitude vibrations. Nevertheless, the harvestable energy per vibration cycle depends on the switching pattern and storage-capacitor voltage. The use of the proposed switching strategy, which allows energy harvesting before energy-dissipative voltage inversion, substantially increases the harvestable energy per vibration cycle. In the typical case considered in this study, the said increase is on the order of 11%–31% and 15%–450% compared to the traditional and existing high-frequency S3HI methods, respectively, depending on the storage-capacitor voltage. Additionally, the proposed circuit can be used as a traditional circuit. It could be considered a promising alternative to S3HI methods owing to its potential auto-reboot capability, which is not found in traditional S3HI circuit.
  • Seong-Cheol Kwon, Junjiro Onoda, Hyun-Ung Oh
    Sensors and Actuators A: Physical 281 55-66 2018年10月  査読有り
  • Seong-Cheol Kwon, Junjiro Onoda, Hyun-Ung Oh
    Mechanical Systems and Signal Processing 117 2018年8月  査読有り
  • Junjiro Onoda, Shigeru Shimose, Kenji Minesugi
    JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES 28(7) 888-906 2017年4月  査読有り
    This article describes the optimal configuration and combination of piezoelectric transducers and inductors for the synchronized-switch-damping-on-an-inductor technique. The technique suppresses structural vibrations by inverting the polarity of the electric voltage in a piezoelectric transducer using a switched inductive shunt circuit at each displacement extremum. The energy dissipation rate of synchronized switch damping on an inductor depends on the impedances of the transducer and the inductor in the circuit, especially the resistive component, in this inversion. For this study, mathematical models of the equivalent resistances of transducers and inductors for this inversion phenomenon were formulated based on experiments with various transducers and inductors. Using these models, the optimal ratio of the thickness-area of patch-type piezoelectric transducers and that of the length-cross-sectional area of the lead of the inductors were analytically obtained. The optimization of series-parallel connections of multiple transducers and inductors was also shown to be equivalent to this one. The optimal mass budget allocation for the transducers and inductors was also formulated. Two examples of optimization, involving an increase in energy dissipation rates by a factor of 4, were presented. The examples showed that the time taken to suppress free vibrations in a clamped beam was reduced to half through the optimization.

MISC

 53

講演・口頭発表等

 243

共同研究・競争的資金等の研究課題

 12