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Proceedings Paper

Investigation of geometries of bistable piezoelectric-laminate plates for vibration-based energy harvesting
Author(s): David N. Betts; Christopher R. Bowen; Daniel J. Inman; Paul M. Weaver; H. Alicia Kim
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Paper Abstract

The need for reduced power requirements for small electronic components, such as wireless sensor networks, has prompted interest in recent years for energy harvesting technologies capable of capturing energy from broadband ambient vibrations. Encouraging results have been reported for an arrangement of piezoelectric layers attached to carbon fiber / epoxy laminates which possess bistability by virtue of their specific asymmetric stacking sequence. The inherent bistability of the underlying structure is exploited for energy harvesting since a transition from one stable configuration to another, or ‘snap-through’, is used to repeatedly strain the surface-bonded piezoelectric and generate electrical energy. Existing studies, both experimental and modelling, have been limited to simple geometric laminate shapes, restricting the scope for improved energy harvesting performance by limiting the number of design variables. In this paper we present an analytical model to predict the static shapes of laminates of any desired profile, validated experimentally using a digital image correlation system. Good accuracy in terms of out-of-plane displacements (5-7%) are shown in line with existing square modelling results. The static model is then mapped to a dynamics model and used to compare results against an experimental study of the harvesting performance of an example arbitrary geometry piezoelectric-laminate energy harvester.

Paper Details

Date Published: 1 April 2014
PDF: 14 pages
Proc. SPIE 9057, Active and Passive Smart Structures and Integrated Systems 2014, 90571E (1 April 2014); doi: 10.1117/12.2044771
Show Author Affiliations
David N. Betts, Univ. of Bath (United Kingdom)
Christopher R. Bowen, Univ. of Bath (United Kingdom)
Daniel J. Inman, Univ. of Michigan (United States)
Paul M. Weaver, National Physical Lab. (United Kingdom)
H. Alicia Kim, Univ. of Bath (United Kingdom)


Published in SPIE Proceedings Vol. 9057:
Active and Passive Smart Structures and Integrated Systems 2014
Wei-Hsin Liao, Editor(s)

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