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Sensors 2015, 15(6), 12594-12612; doi:10.3390/s150612594

Peculiarities of the Third Natural Frequency Vibrations of a Cantilever for the Improvement of Energy Harvesting

1
Institute of Mechatronics, Kaunas University of Technology, Studentu 56-123, Kaunas LT-51368, Lithuania
2
Faculty of Mechanical Engineering and Design, Kaunas University of Technology, Studentu 56-338, Kaunas LT-51368, Lithuania
3
Faculty of Electrical and Electronics Engineering, Kaunas University of Technology, Studentu 48-211, Kaunas LT-51368, Lithuania
4
Faculty of Informatics, Kaunas University of Technology, Studentu 48-213, Kaunas LT-51368, Lithuania
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 21 February 2015 / Revised: 14 May 2015 / Accepted: 20 May 2015 / Published: 28 May 2015
(This article belongs to the Section Physical Sensors)

Abstract

This paper focuses on several aspects extending the dynamical efficiency of a cantilever beam vibrating in the third mode. A few ways of producing this mode stimulation, namely vibro-impact or forced excitation, as well as its application for energy harvesting devices are proposed. The paper presents numerical and experimental analyses of novel structural dynamics effects along with an optimal configuration of the cantilever beam. The peculiarities of a cantilever beam vibrating in the third mode are related to the significant increase of the level of deformations capable of extracting significant additional amounts of energy compared to the conventional harvester vibrating in the first mode. Two types of a piezoelectric vibrating energy harvester (PVEH) prototype are analysed in this paper: the first one without electrode segmentation, while the second is segmented using electrode segmentation at the strain nodes of the third vibration mode to achieve effective operation at the third resonant frequency. The results of this research revealed that the voltage generated by any segment of the segmented PVEH prototype excited at the third resonant frequency demonstrated a 3.4–4.8-fold increase in comparison with the non-segmented prototype. Simultaneously, the efficiency of the energy harvester prototype also increased at lower resonant frequencies from 16% to 90%. The insights presented in the paper may serve for the development and fabrication of advanced piezoelectric energy harvesters which would be able to generate a considerably increased amount of electrical energy independently of the frequency of kinematical excitation. View Full-Text
Keywords: vibro-impact motion; optimal configuration; vibration energy harvesting; piezoelectric layer; resonant frequency; laser vibrometry; holography system vibro-impact motion; optimal configuration; vibration energy harvesting; piezoelectric layer; resonant frequency; laser vibrometry; holography system
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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

Ostasevicius, V.; Janusas, G.; Milasauskaite, I.; Zilys, M.; Kizauskiene, L. Peculiarities of the Third Natural Frequency Vibrations of a Cantilever for the Improvement of Energy Harvesting. Sensors 2015, 15, 12594-12612.

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