Abstract
Self-excited vibration of a square cylinder has been considered as an effective way in harvesting piezoelectric wind energy. In present work, both of the vortex-induced vibration and unstable galloping phenomenon process are investigated in a reduced velocity (Ur=U/ωn·D) range of4≤Ur≤20with load resistance ranging in100 Ω≤R≤1 MΩ. The vortex-induced vibration covers presynchronization, synchronization, and postsynchronization branches. An aeroelectromechanical model is given to describe the coupling of the dynamic equation of the fluid-structure interaction and the equation of Gauss law. The effects of load resistance are investigated in both the open-circuit and close-circuit system by a linear analysis, which covers the parameters of the transverse displacement, aerodynamic force, output voltage, and harvested power utilized to measure the efficiency of the system. The highest level of the transverse displacement and the maximum value of harvested power of synchronization branch during the vortex-induced vibration and galloping are obtained. The results show that the large-amplitude galloping at high wind speeds can generate energy. Additionally, energy can be harvested by utilization of the lock-in phenomenon of vortex-induced vibration under low wind speed.
Highlights
Wireless sensor network (WSN) has been widely used in various fields, such as environmental monitoring, medicine, and military
The maximum level is obtained when R = 2E5 Ω. Under this selected load resistance, the harvested power is nearly 1.4 watts with the reduced velocity of 20.0 or so. Energy harvesting from both vortex-induced vibration and galloping phenomenon from Self-excited vibration (SEV) of a square cylinder has been investigated under different wind speeds in platform of OpenFOAM
It can be concluded that in vortex-induced vibration (VIV) the vibrational displacement curves were varying in a sinusoidal law which is different from the galloping regime
Summary
Wireless sensor network (WSN) has been widely used in various fields, such as environmental monitoring, medicine, and military. The device harvests energy from the oscillations induced by vortex shedding from circular cylinders The factors, such as mass ratio, mechanical damping, Reynolds numbers, and aspect ratio (length to diameter) of the cylinder, were investigated. For extracting energy from flutter phenomenon, Abdelkefi and Nuhait [20] discussed the effects of a cambered wingbased piezoaeroelastic energy harvester Both linear and nonlinear mathematical models have been developed to predict the performance of the device. It is worth noting that both vortex-induced vibration and galloping of a square-section structure can be utilized in the same piezoelectric wind energy harvesting equipment, because both of the two phenomena can cause large oscillating amplitude that can be good power source to excite. This paper describes a piezoelectric device considering both vortex-induced vibration and galloping of a squaresection cylinder for harvesting wind energy.
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