Abstract
Aiming to predict the performance of galloping piezoelectric energy harvesters, a theoretical model is established and verified by experiments. The relative error between the model and experimental results is 5.3%. In addition, the present model is used to study the AC output characteristics of the piezoelectric energy harvesting system under passive turbulence control (PTC), and the influence of load resistance on the critical wind speed, displacement, and output power under both strong and weak coupling are analyzed from the perspective of electromechanical coupling strength, respectively. The results show that the critical wind speed initially increases and then decreases with increasing load resistance. For weak and critical coupling cases, the output power firstly increases and then decreases with the increase of the load resistance, and reaches the maximum value at the optimal load. For the weak, critical, and strong coupling cases, the critical optimal load is 1.1 MΩ, 1.1 MΩ, and 3.0 MΩ, respectively. Overall, the response mechanism of the presented harvester is revealed.
Highlights
In recent years, micro-electromechanical systems (MEMS) and wireless sensor networks (WSNs) have been developed rapidly in the industrial field
The results showed that 16◦ roughness coverage is effective in the range inducing the reduced vortex-induced vibration (VIV), enhanced VIV, or galloping
Equipping a Passive Turbulence Control (PTC) device on the bluff body can affect the formation of the vortex street behind the bluff body, and different flow-induced motions (FIM) can be observed depending primarily on the circumferential location of the two strips [60,61]
Summary
Micro-electromechanical systems (MEMS) and wireless sensor networks (WSNs) have been developed rapidly in the industrial field. Yan et al [39] theoretically studied a galloping energy harvester with a bluff body of the triangular cross-section using the quasi-steady state approximation method to model the aerodynamic load They concluded that the maximum power was obtained when the lateral displacement was the smallest with the change in load resistance. Mutsuda and Tabesh et al [40,41] established a quasi-steady state vibration model of a piezoelectric cantilever beam under the condition of small deflection vibration They applied the frequency domain analysis method to solve the electromechanical coupling equation by Laplace transform (for a linear system), and put forward the concepts of electric damping and electric stiffness. The paper analyzes the influence of wind speed and external load on the performance of the GEH-PTC under the strong and weak coupling condition
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