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Vibration 2018, 1(1), 123-137; https://doi.org/10.3390/vibration1010010

Model Validation of a Porous Piezoelectric Energy Harvester Using Vibration Test Data

1
College of Engineering, Bay Campus, Swansea University, Fabian Way, Crymlyn Burrows, Swansea SA1 8EN, UK
2
Department of Mechanical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, UK
*
Author to whom correspondence should be addressed.
Received: 19 June 2018 / Revised: 8 August 2018 / Accepted: 14 August 2018 / Published: 18 August 2018
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Abstract

In this paper, a finite element model is coupled to an homogenisation theory in order to predict the energy harvesting capabilities of a porous piezoelectric energy harvester. The harvester consists of a porous piezoelectric patch bonded to the root of a cantilever beam. The material properties of the porous piezoelectric material are estimated by the Mori–Tanaka homogenisation method, which is an analytical method that provides the material properties as a function of the porosity of the piezoelectric composite. These material properties are then used in a finite element model of the harvester that predicts the deformation and voltage output for a given base excitation of the cantilever beam, onto which the piezoelectric element is bonded. Experiments are performed to validate the numerical model, based on the fabrication and testing of several demonstrators composed of porous piezoelectric patches with different percentages of porosity bonded to an aluminium cantilever beam. The electrical load is simulated using a resistor and the voltage across the resistor is measured to estimate the energy generated. The beam is excited in a range of frequencies close to the first and second modes using base excitation. The effects of the porosity and the assumptions made for homogenisation are discussed. View Full-Text
Keywords: energy harvesting; porous material; piezoelectricity; model validation; physical experiment energy harvesting; porous material; piezoelectricity; model validation; physical experiment
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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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Martínez-Ayuso, G.; Haddad Khodaparast, H.; Zhang, Y.; Bowen, C.R.; Friswell, M.I.; Shaw, A.D.; Madinei, H. Model Validation of a Porous Piezoelectric Energy Harvester Using Vibration Test Data. Vibration 2018, 1, 123-137.

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