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Sensors 2017, 17(12), 2884; https://doi.org/10.3390/s17122884

Rational Design Approach for Enhancing Higher-Mode Response of a Microcantilever in Vibro-Impacting Mode

1
Institute of Mechatronics, Kaunas University of Technology, Studentu 56-123, LT-51368 Kaunas, Lithuania
2
Faculty of Mechanical Engineering and Design, Kaunas University of Technology, Studentu 56-338, LT-51368 Kaunas, Lithuania
*
Author to whom correspondence should be addressed.
Received: 26 October 2017 / Revised: 5 December 2017 / Accepted: 7 December 2017 / Published: 12 December 2017
(This article belongs to the Section Physical Sensors)
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Abstract

This paper proposes an approach for designing an efficient vibration energy harvester based on a vibro-impacting piezoelectric microcantilever with a geometric shape that has been rationally modified in accordance with results of dynamic optimization. The design goal is to increase the amplitudes of higher-order vibration modes induced during the vibro-impact response of the piezoelectric transducer, thereby providing a means to improve the energy conversion efficiency and power output. A rational configuration of the energy harvester is proposed and it is demonstrated that the new design retains essential modal characteristics of the optimal microcantilever structures, further providing the added benefit of less costly fabrication. The effects of structural dynamics associated with advantageous exploitation of higher vibration modes are analyzed experimentally by means of laser vibrometry as well as numerically via transient simulations of microcantilever response to random excitation. Electrical characterization results indicate that the proposed harvester outperforms its conventional counterpart (based on the microcantilever of the constant cross-section) in terms of generated electrical output. Reported results may serve for the development of impact-type micropower generators with harvesting performance that is enhanced by virtue of self-excitation of large intensity higher-order mode responses when the piezoelectric transducer is subjected to relatively low-frequency excitation with strongly variable vibration magnitudes. View Full-Text
Keywords: vibration energy harvesting; piezoelectric microcantilever; vibro-impact system; modal analysis vibration energy harvesting; piezoelectric microcantilever; vibro-impact system; modal analysis
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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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Migliniene, I.; Ostasevicius, V.; Gaidys, R.; Dauksevicius, R.; Janusas, G.; Jurenas, V.; Krasauskas, P. Rational Design Approach for Enhancing Higher-Mode Response of a Microcantilever in Vibro-Impacting Mode. Sensors 2017, 17, 2884.

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