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- W2327791758 abstract "A galloping piezoelectric energy harvester (GPEH) is composed of a beam with surface bonded piezoelectric layers and a tip bluff body which is susceptible to aeroelastic instability in the presence of axial wind flow. Tubercles on flipper of the hump back whale, have been used for passive control and have proven better aerodynamic performance, i.e., higher L/D ratio and delay of stall. In this paper, a biology inspired wavy leading edge on a square cross-section bluff body was introduced to the GPEH. We expect to fundamentally understand the effect of this bio-inspired bluff body on the GPEH performance. Comprehensive design, analysis, prototype development, and wind tunnel test were conducted in order to characterize its performance. It was shown that the waviness on the leading edge can be used to passively control the GPEH galloping velocity. Voltage and Limit Cycle Oscillation (LCO) amplitude of GPEH decrease with increasing wave steepness and decreasing wavelength due to reduced lift and drag. Also, velocity for initiation of galloping increases with decreasing wavelength. Hitherto, this critical velocity depended on system mechanical damping and shape of bluff body cross-section. Furthermore, analytical prediction of system transient response and effects of the coefficients of vertical aerodynamic force are presented. In summary, a GPEH with a bio-inspired square bluff body was developed and characterized. Compared to the baseline GPEH with square bluff body, there is no obvious gain in terms of harvested energy. However, the wavy leading edge concept on the square bluff body was demonstrated as a passive control scheme to tune galloping velocity, which provides a new method to measure air speed by simply using an array of such GPEHs." @default.
- W2327791758 created "2016-06-24" @default.
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- W2327791758 date "2015-01-02" @default.
- W2327791758 modified "2023-09-23" @default.
- W2327791758 title "Galloping Piezoelectric Energy Harvester with Bio-inspired Square Bluff Body" @default.
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- W2327791758 doi "https://doi.org/10.2514/6.2015-1257" @default.
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