Abstract
Flow-induced vibration (FIV) is concerned in a broad range of engineering applications due to its resultant fatigue damage to structures. Nevertheless, such fluid-structure coupling process continuously extracts the kinetic energy from ambient fluid flow, presenting the conversion potential from the mechanical energy to electricity. As the air and water flows are widely encountered in nature, piezoelectric energy harvesters show the advantages in small-scale utilization and self-powered instruments. This paper briefly reviewed the way of energy collection by piezoelectric energy harvesters and the various measures proposed in the literature, which enhance the structural vibration response and hence improve the energy harvesting efficiency. Methods such as irregularity and alteration of cross-section of bluff body, utilization of wake flow and interference, modification and rearrangement of cantilever beams, and introduction of magnetic force are discussed. Finally, some open questions and suggestions are proposed for the future investigation of such renewable energy harvesting mode.
Highlights
Over the past two decades, the demand for electrochemical batteries has been tremendously growing with the blooming of wireless sensor networks (WSNs) and microelectronicmechanical systems (MEMSs) [1]
Electricity could be converted from the mechanical energy of wind, tide, current, and other natural resources by considering electromagnetic, electrostatic, dielectric, triboelectric, and piezoelectric effects. e coil is usually used in an electromagnetic conductor to create electricity when there is a relative movement between the coil and the magnet. e generating capacity depends on the strength of the magnetic field, relative movement velocity and the turns of the coil [5]. e key component of an electrostatic generator is a variable capacitor, converting the energy of mechanical motion to electrical one through altering the capacitance [6]. e capacitor is employed in dielectric generator, where the capacitor usually consists of two plates electrically isolated from each other by air, vacuum, or an insulator
Conclusions and Outlooks is paper briefly reviews the associated technologies of piezoelectric energy harvesting from flow-induced vibration
Summary
Over the past two decades, the demand for electrochemical batteries has been tremendously growing with the blooming of wireless sensor networks (WSNs) and microelectronicmechanical systems (MEMSs) [1]. Electricity could be converted from the mechanical energy of wind, tide, current, and other natural resources by considering electromagnetic, electrostatic, dielectric, triboelectric, and piezoelectric effects. Rough contrastive analysis, the piezoelectric effect is widely applied due to its large piezoelectric coefficients and electromechanical coupling factors as well as high energy convention rates [11, 12]. A cantilever beam attached with a piezoelectric layer and a tip mass is a superior arrangement due to the large deformation and high output power [17, 18]. In developing is work aims to give a brief review of the energy extraction technologies from flow-induced vibrations and the associated improvement methods of piezoelectric harvesters
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