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Characterization of piezoelectric energy harvesting MEMS

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Author
Johnson, Ryan D.
Date
2015-12
Advisor
Grbovic, Dragoslav
Alves, Fabio
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Abstract
Energy conservation and increased efficiency lie at the forefront of defense missions, capabilities, and costs. Expeditionary forces require energy efficient devices embarkable on naval, ground, and air assault vessels. Piezoelectric MEMS (microelectromechanical systems) devices can be used to convert energy— usually lost to mechanical vibrations—into usable electrical energy without adding significant weight or size to existing equipment. Previous work has analyzed materials and processes, and designed a piezoelectric energy harvesting device leading to its fabrication and characterization. This thesis experimentally tests the piezoelectric MEMS device and integrates the results into a refined model. The effects of Rayleigh damping and squeeze film damping are introduced to improve the connection between experimental data and a finite element model using COMSOL Multiphysics. This model exhibits good agreement with experimental results for resonant frequencies and output potential. From this model, the design can be optimized to resonate at 60 Hz.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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http://hdl.handle.net/10945/47971
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  • 1. Thesis and Dissertation Collection, all items

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