TITLE:
Piezoelectric Power Harvesting via Acoustic-Pressure Driven by Low-Speed Wind-Force with Resonating-Tube and Wind-Collector
AUTHORS:
Seiichi Deguchi, Hiroya Taguchi, Hajime Arimura, Noriyuki Kobayashi, Norifumi Isu, Kentaro Takagi, Tsuyoshi Inoue, Takashi Nozoe, Seigo Saito, Takahiko Sano
KEYWORDS:
Piezoelectric Power Generation, Low Wind Speed, Resonating Tube, Wind Collector, Power Harvesting, Practical Demonstration
JOURNAL NAME:
Journal of Power and Energy Engineering,
Vol.6 No.11,
November
27,
2018
ABSTRACT: Wind-driven power harvestings attract attentions since their target wind speeds are quite low less than the so-called cut-in wind speed, which is generally recognized as around 3 m/s. The extant power harvestings driven by wind-induced-air-column-resonations (i.e. acoustic-pressures) are still lacking simplicity, scale flexibility and solid strategies for practical applications. Therefore, the piezoelectric power harvesters via acoustic-pressures driven by low-speedwind-forces with resonating-tubes and wind-collectors were invented so as to complement all the lacks. The wind-collector as well as the resonating-tube contributed to upraise the power harvesting density. The champion power harvesting density of 19.5 nW/dm2 could be procured at 2.3 m/s of an artificial wind and the optimal resonating-tube and wind-collector. Power harvesting proofs from the natural wind with low mean speeds down to about 0.6 m/s were successfully obtained. The cut-in wind speed of the prototype piezoelectric power harvester was found to be quite low as about 0.4 m/s, signifying its ubiquity. Finally, a multi-bundle pendant-type piezoelectric power harvester was specifically presented together with professing the solid and multiple strategies for practical applications.