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A geometric parameter study of piezoelectric coverage on a rectangular cantilever energy harvester

Patel, R.; McWilliam, S.; Popov, A.A.

Authors

R. Patel

S. McWilliam

A.A. Popov



Abstract

This paper proposes a versatile model for optimizing the performance of a rectangular cantilever beam piezoelectric energy harvester used to convert ambient vibrations into electrical energy. The developed model accounts for geometric changes to the natural frequencies, mode shapes and damping in the structure. This is achieved through the combination of finite element modelling and a distributed parameter electromechanical model, including load resistor and charging capacitor models. The model has the potential for use in investigating the influence of numerous geometric changes on harvester performance, and incorporates a model for accounting for changes in damping as the geometry changes. The model is used to investigate the effects of substrate and piezoelectric layer length, and piezoelectric layer thickness on the performance of a microscale device. Findings from a parameter study indicate the existence of an optimum sample length due to increased mechanical damping for longer beams and improved power output using thicker piezoelectric layers. In practice, harvester design is normally based around a fixed operating frequency for a particular application, and improved performance is often achieved by operating at or near resonance. To achieve unbiased comparisons between different harvester designs, parameter studies are performed by changing multiple parameters simultaneously with the natural frequency held fixed. Performance enhancements were observed using shorter piezoelectric layers as compared to the conventional design, in which the piezoelectric layer and substrate are of equal length.

Journal Article Type Article
Publication Date Jun 28, 2011
Journal Smart Materials and Structures
Print ISSN 0964-1726
Electronic ISSN 0964-1726
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 20
Issue 8
Article Number 085004
Institution Citation Patel, R., McWilliam, S., & Popov, A. (2011). A geometric parameter study of piezoelectric coverage on a rectangular cantilever energy harvester. Smart Materials and Structures, 20(8), doi:10.1088/0964-1726/20/8/085004
DOI https://doi.org/10.1088/0964-1726/20/8/085004
Keywords Energy harvesting, Piezoelectric beam, Finite element method
Publisher URL http://iopscience.iop.org/article/10.1088/0964-1726/20/8/085004/meta
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This is an author-created, un-copyedited version of an article published in Smart Materials and Structures. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:10.1088/0964-1726/20/8/085004.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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