Piezoelectric resonance shifting using tunable nonlinear stiffness

Timothy Reissman; Eric M. Wolff; Ephrahim Garcia

doi:10.1117/12.817708

6 April 2009 Piezoelectric resonance shifting using tunable nonlinear stiffness

Timothy Reissman, Eric M. Wolff, Ephrahim Garcia

Proceedings Volume 7288, Active and Passive Smart Structures and Integrated Systems 2009; 72880G (2009) https://doi.org/10.1117/12.817708
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

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.

Citation Download Citation

Timothy Reissman, Eric M. Wolff, and Ephrahim Garcia "Piezoelectric resonance shifting using tunable nonlinear stiffness", Proc. SPIE 7288, Active and Passive Smart Structures and Integrated Systems 2009, 72880G (6 April 2009); https://doi.org/10.1117/12.817708

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