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On the optimal bending deflection of piezoelectric scavengers

By Benasciutti D, Moro L and Gallina M

Abstract

This study aims at exploring the possibility to optimize the electromechanical efficiency of piezoelectric cantilevers by imposing an optimal deflection to classical rectangular devices, rather than designing non-conventional geometries. Focusing on non-vibrating loading conditions, the proposed approach is to apply a constant bending moment to the beam in order to reach the maximum allowable stress on the whole outermost surface. This is realized in practice by pressing the cantilever over a cylindrical-shaped support. Theoretical and numerical models with electromechanical coupling are developed to evaluate the performance improvement compared to the deflection of a classical tip-load configuration. Finally, experimental tests have been performed to further verify the electrical power enhancement given by the proposed optimized layout

Topics: energy harvesting, bending, linear piezoelectric materials
Year: 2013
DOI identifier: 10.1177/1045389X12469451
OAI identifier: oai:iris.unife.it:11392/2329715
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