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Shock and Vibration
Volume 2018, Article ID 5037187, 11 pages
https://doi.org/10.1155/2018/5037187
Research Article

Multifrequency Piezoelectric Energy Harvester Based on Polygon-Shaped Cantilever Array

1Vilnius Gediminas Technical University, Saulėtekio Avn. 11, LT-10223 Vilnius, Lithuania
2Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, P.O. Box 359, Nanjing, Jiangsu 210016, China

Correspondence should be addressed to Dalius Ma┼żeika; tl.utgv@akiezam.suilad

Received 25 August 2017; Revised 3 December 2017; Accepted 11 January 2018; Published 8 March 2018

Academic Editor: Michele Magno

Copyright © 2018 Dalius Mažeika et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper focuses on numerical and experimental investigations of a novel design piezoelectric energy harvester. Investigated harvester is based on polygon-shaped cantilever array and employs multifrequency operating principle. It consists of eight cantilevers with irregular design of cross-sectional area. Cantilevers are connected to each other by specific angle to form polygon-shaped structure. Moreover, seven seismic masses with additional lever arms are added in order to create additional rotation moment. Numerical investigation showed that piezoelectric polygon-shaped energy harvester has five natural frequencies in the frequency range from 10 Hz to 240 Hz, where the first and the second bending modes of the cantilevers are dominating. Maximum output voltage density and energy density equal to 50.03 mV/mm3 and 604 μJ/mm3, respectively, were obtained during numerical simulation. Prototype of piezoelectric harvester was made and experimental investigation was performed. Experimental measurements of the electrical characteristics showed that maximum output voltage density, energy density, and output power are 37.5 mV/mm3, 815.16 μJ/mm3, and 65.24 μW, respectively.