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Proceedings Paper

Piezoelectric resonance shifting using tunable nonlinear stiffness
Author(s): Timothy Reissman; Eric M. Wolff; Ephrahim Garcia
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Paper Abstract

Piezoelectric cantilever devices for energy harvesting purposes have typically been tuned by manipulating beam dimensions or by placement of a tip mass. While these techniques do lend themselves well to designing a highly tuned resonance, the design is fixed and causes each system to be unique to a specific driving frequency. In this work, we demonstrate the design of a nonlinear tuning technique via a variable external, attractive magnetic force. With this design, the resonance of the piezoelectric energy harvester is able to be tuned with the adjustment of a slider mechanism. The magnetic design uses the well of attraction principle in order to create a varying nonlinear stiffness, which shifts the resonance of the coupled piezoelectric beam. The significance of this work is the design of a piezoelectric energy harvesting system with a variable resonance frequency that can be adjusted for changes in the driving frequencies over a wide range without the replacement of any system components; thus, extending the usefulness of these vibration energy harvesting devices over a larger frequency span.

Paper Details

Date Published: 6 April 2009
PDF: 12 pages
Proc. SPIE 7288, Active and Passive Smart Structures and Integrated Systems 2009, 72880G (6 April 2009); doi: 10.1117/12.817708
Show Author Affiliations
Timothy Reissman, Cornell Univ. (United States)
Eric M. Wolff, Cornell Univ. (United States)
Ephrahim Garcia, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 7288:
Active and Passive Smart Structures and Integrated Systems 2009
Mehdi Ahmadian; Mehrdad N. Ghasemi-Nejhad, Editor(s)

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