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Sensors 2016, 16(1), 11; doi:10.3390/s16010011

Segmentation of a Vibro-Shock Cantilever-Type Piezoelectric Energy Harvester Operating in Higher Transverse Vibration Modes

1
Faculty of Mechanical Engineering and Design, Kaunas University of Technology, Studentu 56, Kaunas LT-51368, Lithuania
2
Institute of Mechatronics, Kaunas University of Technology, Studentu 56-123, Kaunas LT-51368, Lithuania
3
Faculty of Informatics, Kaunas University of Technology, Studentu 50, Kaunas LT-51368, Lithuania
*
Author to whom correspondence should be addressed.
Academic Editor: Davide Brunelli
Received: 10 November 2015 / Revised: 8 December 2015 / Accepted: 14 December 2015 / Published: 23 December 2015
(This article belongs to the Section Sensor Networks)
View Full-Text   |   Download PDF [8318 KB, uploaded 23 December 2015]   |  

Abstract

The piezoelectric transduction mechanism is a common vibration-to-electric energy harvesting approach. Piezoelectric energy harvesters are typically mounted on a vibrating host structure, whereby alternating voltage output is generated by a dynamic strain field. A design target in this case is to match the natural frequency of the harvester to the ambient excitation frequency for the device to operate in resonance mode, thus significantly increasing vibration amplitudes and, as a result, energy output. Other fundamental vibration modes have strain nodes, where the dynamic strain field changes sign in the direction of the cantilever length. The paper reports on a dimensionless numerical transient analysis of a cantilever of a constant cross-section and an optimally-shaped cantilever with the objective to accurately predict the position of a strain node. Total effective strain produced by both cantilevers segmented at the strain node is calculated via transient analysis and compared to the strain output produced by the cantilevers segmented at strain nodes obtained from modal analysis, demonstrating a 7% increase in energy output. Theoretical results were experimentally verified by using open-circuit voltage values measured for the cantilevers segmented at optimal and suboptimal segmentation lines. View Full-Text
Keywords: piezoelectric; optimal segmentation; vibration energy harvesting; resonant frequency; strain node; numerical modelling piezoelectric; optimal segmentation; vibration energy harvesting; resonant frequency; strain node; numerical modelling
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. (CC BY 4.0).

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MDPI and ACS Style

Zizys, D.; Gaidys, R.; Dauksevicius, R.; Ostasevicius, V.; Daniulaitis, V. Segmentation of a Vibro-Shock Cantilever-Type Piezoelectric Energy Harvester Operating in Higher Transverse Vibration Modes. Sensors 2016, 16, 11.

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