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Appl. Sci. 2017, 7(2), 134;

Trapezoidal Cantilevers with Irregular Cross-Sections for Energy Harvesting Systems

Department of Information Systems, Faculty of Fundamental Sciences, Vilnius Gediminas Technical University, Vilnius LT-10223, Lithuania
Laboratory of Robotics and Piezomechanics, Institute of Mechatronics, Kaunas University of Technology, Kaunas LT-44249, Lithuania
Author to whom correspondence should be addressed.
Academic Editor: Steve Beeby
Received: 27 November 2016 / Revised: 18 January 2017 / Accepted: 20 January 2017 / Published: 29 January 2017
(This article belongs to the Section Energy)
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The results of numerical and experimental investigation of trapezoidal cantilevers with irregular cross-sections are presented in this paper. Modifications of the cross-section were made in order to increase strain and improve its distribution in the piezo ceramic layer of a cantilever. The proposed modifications allowed improving the energy conversion coefficient and increasing the power density. The numerical investigation revealed that modifications have a positive influence on strain and its distribution characteristics. Moreover, the electrical characteristics of piezoelectric cantilevers were investigated by employing a numerical model. The analysis of the results revealed that modifications of the cross-section have positively affected the electrical outputs of the cantilevers. The results of the numerical investigation were validated by experimental investigation. Experimental investigation showed that output voltage density was increased by 9.9%, output current density by 6.9% and power density by more than three-times compared with a conventional cantilever. View Full-Text
Keywords: piezoelectric energy harvesting; trapezoidal cantilever beam; irregular cross-section piezoelectric energy harvesting; trapezoidal cantilever beam; irregular cross-section

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Čeponis, A.; Mažeika, D.; Bakanauskas, V. Trapezoidal Cantilevers with Irregular Cross-Sections for Energy Harvesting Systems. Appl. Sci. 2017, 7, 134.

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