Abstract
To meet the needs of low-power microelectronic devices for on-site self-supply energy, a galloping piezoelectric–electromagnetic energy harvester (GPEEH) is proposed. It consists of a galloping piezoelectric energy harvester (GPEH) and an electromagnetic energy harvester (EEH), which is installed inside the bluff body of the GPEH. The vibration at the end of the GPEH cantilever drives the magnet to vibrate, so that electromagnetic energy can be captured by cutting off the induced magnetic field lines. The coupling structure is a two-degree-of-freedom motion, which improves the output power of the energy harvester. Based on Hamilton’s variational principle and quasi-static hypothesis, the piezoelectric–electromagnetic vibrated coupling equation is established, and the output characteristics of GPEEH are obtained by the method of numerical simulation. Using the method of numerical simulation, studies a series of parameters on the output performance. when the wind speed is 9 m/s, the effective output power of the GPEEH is compared with the classical galloping piezoelectric energy harvester (CGPEH) who is no magnet. It is found that the output power of GPEEH 121% higher than the output power of CGPEH. Finally, set up an experimental platform, and test and verify. The experimental analysis results show that the simulated output parameter curves are basically consistent with the experimental drawing curves. In addition, when the wind speed is 9 m/s, under the same parameters, the effective output power of the GPEEH is 112.5% higher than that of the CGPEH. The correctness of the model is verified.
Highlights
According to different working principles, environmental energy harvesting devices can be divided into piezoelectric [3], electromagnetic [4], electrostatic [5], thermoelectric [6], and triboelectric [7]
The output power of the galloping piezoelectric energy harvester (GPEH) is represented by, and the output power of the energy harvester (EEH) is as Vol, and the induced current generated by the coil of EEH is expressed as Ic
The output represented by . the effective output power is expressed as power of the GPEH is represented by P1, and the output power of the EEH is represented by P2 . the effective output power is expressed as Prms
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Many scholars who study galloping energy harvesters mainly focus on (1) The influence of structural parameters of beams and cross-sections for output characteristics [24]; (2) Modeling of galloping force analysis [25]; (3) Introduce nonlinear factors [26]; (4) Hybrid galloping energy harvester [27]. Abdelkefi et al [34] proposed a nonlinear parameterized model, to study the effect of the cross-sectional shapes of the bluff bodies for the output efficiency of the energy harvester. Electromagnetic harvester, whichitcan work in resonance in proposed the range a multi-degree-of-freedom, multi-vibration mode hybrid piezoelectric–electromagnetic of 12–22 Hz. Under the 0.4 g of acceleration and the optimal load, the maximum output energy of harvester, which can work four resonance modes in the range of. There are some experimental researches to verify the correctness of the model
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