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RISS 인기검색어
- 검색키워드
- 저자 : Junjiro Onoda (검색결과 5 건)
- 무료
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Flutter Suppression of Cantilevered Plate Wing using Piezoelectric Materials
Makihara, Kanjuro,Onoda, Junjiro,Minesugi, Kenji The Korean Society for Aeronautical and Space Scie 2006 International Journal of Aeronautical and Space Sc Vol.7 No.2
The supersonic flutter suppression of a cantilevered plate wing is studied with the finite element method and the quasi-steady aerodynamic theory. We suppress wing flutter by using piezoelectric materials and electric devices. Two approaches to flutter suppression using piezoelectric materials are presented; an energy-recycling semi-active approach and a negative capacitance approach. To assess their flutter suppression performances, we simulate flutter dynamics of the plate wing to which piezoelectric patches are attached. The critical dynamic pressure drastically increases with our flutter control using a negative capacitor.
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Flutter Suppression of Cantilevered Plate Wing using Piezoelectric Materials
Kanjuro Makihara,Junjiro Onoda,Kenji Minesugi 한국항공우주학회 2006 International Journal of Aeronautical and Space Sc Vol.7 No.2
The supersonic flutter suppression of a cantilevered plate wing is studied with the finite element method and the quasi-steady aerodynamic theory. We suppress wing flutter by using piezoelectric materials and electric devices. Two approaches to flutter suppression using piezoelectric materials are presented; an energy-recycling semi-active approach and a negative capacitance approach. To assess their flutter suppression performances, we simulate flutter dynamics of the plate wing to which piezoelectric patches are attached. The critical dynamic pressure drastically increases with our flutter control using a negative capacitor.
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Kwon, Seong-Cheol,Onoda, Junjiro,Oh, Hyun-Ung Elsevier 2018 Sensors and actuators. A, Physical Vol.281 No.-
<P><B>Abstract</B></P> <P>Micro-jitter is regarded as a primary source of image-quality degradation for high-resolution observation satellites. To comply with the strict mission requirements of high-quality image acquisitions, most technical efforts have been directed toward isolating the micro-jitter disturbances. However, in this study, we focused on the feasibility of utilizing the micro-jitter as a piezoelectric-based energy-harvesting target. To harvest the micro-scale jitter effectively, a switching strategy that intentionally induces a surge phenomenon was applied. The surge phenomenon was induced by a sudden current transition in the inductor, right after the switching action, such that the piezo-induced voltage can be significantly boosted. This switching strategy was suitable for the micro-jitter energy harvesting and was further enhanced by adopting an optimal switching duration. The effectiveness of the proposed piezoelectric-based surge-inducing optimal switching strategy was demonstrated through incorporating numerical simulation and experiments.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study proposed a piezoelectric-based surge-inducing switching strategy for effectively harvesting the micro-jitter energy induced by spaceborne cooler. </LI> <LI> This strategy exploits the full potential of the surge phenomenon which is caused by an inductor. </LI> <LI> This strategy can be optimally tuned and very effective in micro-scale jitter energy harvesting. </LI> <LI> The proposed strategy can be also utilized in random vibration harvesting without requiring any feedback controller </LI> <LI> The effectiveness of the study was verified through incorporating numerical simulations and experiments. </LI> </UL> </P>
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Kwon, Seong-Cheol,Onoda, Junjiro,Oh, Hyun-Ung Elsevier 2019 Mechanical systems and signal processing Vol.117 No.-
<P><B>Abstract</B></P> <P>Energy harvesting technology has recently received remarkable attention in line with progressive developments in low-power-consuming microsystems used in daily applications. In particular, piezoelectric elements have received considerable attention for promising energy harvesting systems because of their applicability and simplicity. In this study, a high-frequency surge-inducing synchronized switching (H-S<SUP>3</SUP>HI) strategy that exploits the full potential of the surge phenomenon is proposed to effectively improve the energy harvesting efficiency of piezoelectric harvesters. Moreover, this strategy can guarantee the useable energy harvesting performance even for micro-scale vibrations. The effectiveness of the proposed switching strategy was demonstrated by performing numerical simulations and experiments with a cantilever-type piezoelectric harvester under sinusoidal and random-vibration conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study suggested a novel switching strategy that exploits the full potential of the surge phenomenon to effectively improve the energy harvesting efficiency of the piezoelectric harvester. </LI> <LI> This strategy can guarantee the promising harvesting performance even for micro-scale vibrations. </LI> <LI> The basic is to make the switching duration relatively longer than the conventional one, while realizing a high-frequency switching. Thereby, both demands of maximizing the incoming energy and maintaining the surging mechanism can be satisfied. </LI> <LI> The effectiveness of the proposed strategy was evaluated through numerical simulations and evaluation tests. </LI> </UL> </P>
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