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Sensors 2018, 18(3), 804; https://doi.org/10.3390/s18030804

Electrode Coverage Optimization for Piezoelectric Energy Harvesting from Tip Excitation

1
Department of Aeronautics, Imperial College London, Exhibition Road, London SW7 2AZ, UK
2
College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chenghua District, Chengdu 610059, China
*
Authors to whom correspondence should be addressed.
Received: 29 January 2018 / Revised: 28 February 2018 / Accepted: 1 March 2018 / Published: 7 March 2018
(This article belongs to the Section Intelligent Sensors)
Full-Text   |   PDF [5736 KB, uploaded 7 March 2018]   |  

Abstract

Piezoelectric energy harvesting using cantilever-type structures has been extensively investigated due to its potential application in providing power supplies for wireless sensor networks, but the low output power has been a bottleneck for its further commercialization. To improve the power conversion capability, a piezoelectric beam with different electrode coverage ratios is studied theoretically and experimentally in this paper. A distributed-parameter theoretical model is established for a bimorph piezoelectric beam with the consideration of the electrode coverage area. The impact of the electrode coverage on the capacitance, the output power and the optimal load resistance are analyzed, showing that the piezoelectric beam has the best performance with an electrode coverage of 66.1%. An experimental study was then carried out to validate the theoretical results using a piezoelectric beam fabricated with segmented electrodes. The experimental results fit well with the theoretical model. A 12% improvement on the Root-Mean-Square (RMS) output power was achieved with the optimized electrode converge ratio (66.1%). This work provides a simple approach to utilizing piezoelectric beams in a more efficient way. View Full-Text
Keywords: piezoelectric; electrode coverage; energy harvesting; cantilever beam; tip excitation; distributed parameter modelling piezoelectric; electrode coverage; energy harvesting; cantilever beam; tip excitation; distributed parameter modelling
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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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Fu, H.; Chen, G.; Bai, N. Electrode Coverage Optimization for Piezoelectric Energy Harvesting from Tip Excitation. Sensors 2018, 18, 804.

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