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RISS 인기검색어
- 검색키워드
- 저자 : Dejan Vasic (검색결과 2 건)
- 무료
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Self-powered piezoelectric energy harvester for bicycle
Dejan Vasic,Yu-Yin Chen,François Costa 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.7
Various electronic accessories, such as on-board computers, communication devices, and wireless sensor nodes, have been installed onbicycles for several years. A powering scheme from ambient energy could avoid the use of batteries and improve the availability of thesedevices even when the bicycle is unused for a long time. This paper reports on vibration resources detected in a bicycle as a potentialenergy source for supplying these on-board devices. Measurements showed that the bandwidth of energy vibration is reduced with speedand that the vibrations at any location in the bicycle are nevertheless sufficient for useful vibration harvesting. For this application, a piezoelectricvibration harvester was designed and equipped with a voltage switching interface circuit. Sufficient energy is harvested duringthe field test.
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Semi-passive piezoelectric structural damping based on a pulse-width modulation switching circuit
Yuan-Ping Liu,Dejan Vasic 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.12
Studies in the past focused on the implementation of semi-passive damping techniques that could significantly reduce structural vibration. Recently, the performances of these damping techniques have been enhanced by artificially increasing the voltage amplitude delivered by the piezoelectric patches with an external voltage source. To maintain the stability of this damping method, an adaptive voltage source must be used. To satisfy this requirement, this study proposes an enhanced semi-passive damping technique based on pulse-width modulation. The proposed method allows the waveform of the piezoelectric voltage to adapt to the vibration velocity. Thus, this method can maintain its stability with a constant voltage source and simultaneously exhibit superior performance. This study consists of a theoretical part and an experimental proof-of-concept demonstration of the proposed damping technique.
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