# Design and Development of Bladeless Vibration-Based Piezoelectric Energy-Harvesting Wind Turbine
## 1 Introduction
[10] on four alternative orientations of the circular cylinder while subjected to vortex-induced vibrations, including tests for different wind speed areas for each harvester design. They also recommended the best orientations for various wind speeds. Variations in wind speed cause the obtained energy levels to drop substantially due to the restricted range of the synchronization region, which is a severe setback for energy collection. This setback restricts VIV energy harvesting's ability to achieve efficient performance and the intended design. As a result, scientists are working on novel approaches to creating broadband energy harvesting systems susceptible to flow-driven vibrations or base harmonic excitations. The foundation of these solutions is the use of external axial loading or magnetic forces to introduce nonlinear restoration forces. These new nonlinear forces increase power generation by hardening or softening behavior, resulting in a wide range of resonant frequencies. Structures can be monostable or bistable depending on the magnitude of the force due to the buckling instability generated by these nonlinear features. The biostable structure is reported to produce broadband resonant regions for base-excited energy harvesters. Furthermore, [PERSON] and [PERSON] [11] demonstrated that multiple acceleration levels are required to activate the biostable configuration to produce too-vast broadband resonant regions. [PERSON] et al. [12] used vortex-induced vibrations in a study in which two sets of attracting magnets were positioned so that the harvester could be buckled to extend the synchronization zone and enhance the power-collected performance level. [PERSON] and [PERSON] [13] introduced magnetic force to design a bi-directional U-shaped piezoelectric energy harvester for vortex-induced vibrations. They claimed that by adding magnets to their design, significant improvement of the lock-in region and the peak voltage were noticed. [PERSON] et al. [14] constructed a set of representative coupled equations that account for the transverse displacement of the bluff body and the induced electromagnetic current. Nonlinear analysis was also performed in their study to investigate the effects of the electrical load resistance and wind speed on the harvester's outputs. [PERSON] and [PERSON] [15] analyzed two airfoil-based aeroelastic energy harvesters using piezoelectric transduction and electromagnetic induction. Adding piezoelectric and electromagnetic couplings, they investigated an airfoil with two degrees of freedom. [PERSON] et al. [16] developed a piezoelectric generator that harvests mechanical vibration energy on a bicycle. [PERSON] et al. [17] developed a vibration energy-harvesting device using the cantilever-type configuration to harvest vibration energy from vehicles. Lead zirconate titanate (PZT) was selected as the piezoelectric material. [PERSON] and [PERSON] [18] investigated the mechanism of suppression for VIV of circular cylinder by helical wires using the LES turbulence model. Numerical models for free-vibrating circular cylinders with and without helical wires were presented and experimentally validated. The steady and unsteady aerodynamic forces of circular cylinders with and without helical wires were examined to clarify the mechanism of VIV suppression in their study. [PERSON] and [PERSON] [19] investigated the wake galloping of tandem circular cylinders using the LES turbulence model. They proposed a numerical model for a transversely free-vibrating circular cylinder in the wake of another fixed cylinder and validated its accuracy. They also examined the flow patterns and the characteristics of wake galloping and dynamic fluid forces on the downstream cylinder to clarify the effect of mass and spacing ratios. This paper utilizes wind energy power generation using VIV-based fluid-structure wind interaction technology to avoid the trouble-prone mechanical shafts and gears in conventional wind turbines.