Saw-tooth type piezoelectric multi-modal energy harvester
Saw-tooth type piezoelectric multi-modal energy harvester
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DOI：
10.1016/j.sna.2019.02.009
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发表时间：
2019-04
期刊：
影响因子：
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通讯作者：
D. Mažeika;A. Ceponis;P. Vasiljev;S. Borodinas;Birutė Pliuskuvienė
中科院分区：
文献类型：
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作者：
D. Mažeika;A. Ceponis;P. Vasiljev;S. Borodinas;Birutė Pliuskuvienė
本文介绍了一种新设计的压电能量采集器的锯齿型悬臂阵列的基础上的数值和实验研究结果。所提出的能量采集器具有多模态操作原理，并且允许在窄频率范围内采集机械振动能量。此外，收割机的多模态操作原理使得能够对若干个杠杆的弯曲应变进行求和，并且允许提高收割机的效率。所提出的多模态能量采集器由四个以30°角彼此刚性连接的杠杆组成。为了增加弯曲应变，通过圆柱形间隙修改了悬臂的横截面。在采集器的每个角落都放置了地震质量，以降低自然频率值并产生额外的旋转力矩。数值研究表明，能量采集器在20 ~ 135 Hz范围内具有5个谐振频率。电特性的数值研究表明，该器件的电压密度为48.39mV/mm 3，能量密度为61.25μJ/mm 3。实验结果证实了数值模拟的结果，电压密度和能量密度分别达到55.65mV/mm ~ 3和52.56μJ/mm ~ 3。
The paper presents results of numerical and experimental investigations of a new design piezoelectric energy harvester based on a saw-tooth type cantilever array. The proposed energy harvester has multi-modal operation principle and allows to harvest mechanical vibrations energy in narrow frequency range. Moreover, the multi-modal operation principle of the harvester enable summation of bending strains of several cantilevers and allows to improve efficiency of the harvester. The proposed multi-modal energy harvester consist of four cantilevers that are connected rigidly to each other at 30° angles. Cross-sections of the cantilevers were modified by cylindrical gaps in order to increase bending strain. Seismic masses were placed at each corner of the harvester in order to reduce values of natural frequencies and to create additional rotation moment. Numerical investigation revealed that the energy harvester has five resonance frequencies in the range from 20 Hz to 135 Hz. The numerical investigation of electrical characteristics showed that voltage density of 48.39mV/mm3and energy density of 61.25μJ/mm3was obtained. Experimental investigations confirmed the results of numerical investigation and showed that voltage and energy densities reached 55.65mV/mm3and 52.56μJ/mm3, respectively.