Abstract:Piezoelectric cantilever beam harvester is the most popular type due to its simple structure and easy installation. However it is figured out to collect very low electric power resulting in very limited potential applications. In view of this, we carry out a series of studies on mechanical-electric energy conversion of a laminated composited PZT cantilever in terms of characteristic experiment and modeling. We set up the experiment of energy conversion based on a circuit and structural design. The test data reveals the harvesting capability is significantly affected by three factors that are external excitation, internal resistance load and tip mass. The test data also reveals the mechanical-electric relationship of the harvester demonstrating complicated characteristics, in which voltage/current-strain curves are oval-shaped and power-strain curves are butterfly-shaped. Furthermore, those curves demonstrate bias and even more obvious while tip mass gains more weight, which should attribute to gravity effect of the horizontal cantilever harvester. On the basis, a coupled electromechanical model is proposed by taking gravity effect in consideration to simulate the aforementioned electromechanical behavior of the cantilever harvester. Through comparison with the test data, the model is verified that it can not only precisely predict the harvested electric power, but also effectively describe complex characteristic and its bias deterioration aroused by gravity effect. Overall, the studies have an in-depth exploration of vibration-based energy conversion of PZT harvester. It is believed to have a promising application prospect in this kind of PZT harvesters.
Key words: Vibration-based energy harvesting; horizontal composite piezoelectric cantilever; coupled-mechanical-electric modeling; gravity effect; bias of characteristic curve
薛晓敏,马强力,王佳佳. 复合压电水平悬臂梁振动俘能特性试验及机电耦合模型研究[J]. 振动与冲击, 2022, 41(24): 167-175.
XUE Xiaomin,MA Qiangli,WANG Jiajia. Experimental and modelling studies on mechanical-electric energy conversion of a horizontal composite piezoelectric cantilever. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(24): 167-175.
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