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On the Performance Improvement of Piezoelectric Energy Harvesters

Luciano Moro 1 and Denis Benasciutti 2
1. University of Udine/DPIA, Udine, Italy
2. University of Ferrara, Ferrara, Italy

Abstract — Among the available solutions to harvest energy from vibrating and non-vibrating sources, piezoelectric bimorphs seem to be a suitable choice due to their capability to directly convert applied strain energy into usable electric power. This work reviews the techniques adopted to increase the specific power per unit of volume of piezoelectric scavengers. The design goal is to obtain a uniform stress distribution on the piezoelectric layers, in order to exploit the electro-mechanic energy conversion capability of the whole material. Two approaches are then followed to improve the performance: by designing an optimal shape of the device, or by imposing an optimal bending deflection. For both strategies, results from numerical models and experimental tests are compared. 

Index Terms — Energy harvesting, piezoelectric material, bending deflection, electro-mechanical coupling

Cite: Luciano Moro and Denis Benasciutti, "On the Performance Improvement of Piezoelectric Energy Harvesters," International Journal of Mechanical Engineering and Robotics Research, Vol. 7, No. 3, pp. 257-263, May 2018. DOI: 10.18178/ijmerr.7.3.257-263