Čeponis Andrius, Mažeika Dalius, Kilikevičius Artūras
Department of Engineering Graphics, Faculty of Fundamental Sciences, Vilnius Gediminas Technical University, Sauletėkio Avn., 11, 10223 Vilnius, Lithuania.
Laboratory of Experimental Mechanics, Institute of Mechanical Science, Faculty of Mechanics, Vilnius Gediminas Technical University, Basanavičiaus Str., 28, 03224 Vilnius, Lithuania.
Sensors (Basel). 2022 Apr 8;22(8):2880. doi: 10.3390/s22082880.
The paper presents numerical and experimental investigations on a bi-directional multi-modal energy harvester which is based on a piezoelectric saw-tooth cantilever array. The harvester is composed of four piezoelectric cantilevers which are connected rigidly to each other. At each junction of the cantilevers, there are placed seismic masses which are used to reduce resonant frequencies of the cantilever array. Moreover, at the center of the cantilever array is placed a Z-shaped seismic mass, which is used to obtain an additional rotation moment during excitation of the energy harvester to this way increase the stability of output characteristics via the whole angular range. The rigid connection between cantilevers ensures the transfer of bending deformations from cantilevers which are resonant to cantilevers which are out of resonance operation mode. The design of cantilever array ensures that all piezo ceramics are affected or partly affected by bending deformations while excitation frequency changes from 10 Hz to 160 Hz. In addition, such a composition of the array ensures the multi-modal operation principle. Additionally, the proposed cantilever array is designed to respond to changes of excitation force angle in an XY plane. The numerical and experimental investigation have shown that the proposed energy harvester has four resonant frequencies at a range from 10 Hz to 160 Hz. The electrical characteristics of the harvester were investigated as well. The results of these investigations have shown that cantilever array is able to provide an average output power of 15.3 mW while excitation amplitude is 0.5 m/s and the angle of excitation force changes in range from 0° to 350°.
本文介绍了一种基于压电锯齿悬臂梁阵列的双向多模态能量采集器的数值和实验研究。该采集器由四个相互刚性连接的压电悬臂梁组成。在每个悬臂梁的连接处，放置了用于降低悬臂梁阵列共振频率的地震质量块。此外，在悬臂梁阵列的中心放置了一个Z形地震质量块，用于在能量采集器受到激励时获得额外的旋转力矩，从而通过整个角度范围提高输出特性的稳定性。悬臂梁之间的刚性连接确保了弯曲变形从共振的悬臂梁传递到非共振工作模式的悬臂梁。悬臂梁阵列的设计确保在激励频率从10Hz变化到160Hz时，所有压电陶瓷都受到或部分受到弯曲变形的影响。此外，这种阵列组成确保了多模态工作原理。此外，所提出的悬臂梁阵列设计用于响应XY平面内激励力角度的变化。数值和实验研究表明，所提出的能量采集器在10Hz至160Hz范围内有四个共振频率。还对采集器的电学特性进行了研究。这些研究结果表明，当激励幅度为0.5m/s且激励力角度在0°至350°范围内变化时，悬臂梁阵列能够提供15.3mW的平均输出功率。
