期刊
RENEWABLE ENERGY
卷 178, 期 -, 页码 692-700出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.06.103
关键词
Piezoelectric; Axial Bernoulli beam; Energy harvesting; The magnetic coupling
资金
- China Scholar Council [202008220173]
- National Natural Science Foundation of China [51805489]
- Scientific and Technological Developing Scheme of Ji Lin Province [20190302085GX]
A novel mirror-image rotating piezoelectric energy harvester with multiple resonant frequencies was proposed, broadening the bandwidth and establishing a mathematical model. Experimental results show that under certain parameters, the device has high power generation efficiency, and can quickly power other devices.
A mirror-image rotating piezoelectric energy harvester is proposed, and it can adapt to 2.8 m/s - 13.6 m/s wind speed. It is arranged by the mirror image of two piezoelectric elements, so it has multiple resonant frequencies. The multiple resonant frequencies make the bandwidth of the energy harvester be broadened. The force applied on the piezoelectric beam is aperiodic and an evaluable analytical model is established based on Fourier series and superposition principle. The influence of the system parameters on the piezoelectric beam is deduced by the Bernoulli beam formula of axial direction, and a prototype is made for experiment and application. The results show that when the distance between the two magnets is kept at 15 mm, the torsion angle of the blades is 15 degrees, three blades are selected, and the height of each blade is 50 mm, the power generation effect is optimal, and the power can reach 12.5 mW. Under the optimal power, it only takes 100s to charge the capacitor of 220 mu F to 15V, the prototype can directly power 98 light emitting diodes (LEDs) and make the calculator work. This technology can also be extended for harvesting water energy. (C) 2021 Elsevier Ltd. All rights reserved.
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