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An Improved Magnetically Bistable Piezoelectric Energy Harvester

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Conference

ASEE 2021 Gulf-Southwest Annual Conference

Location

Waco, Texas

Publication Date

March 24, 2021

Start Date

March 24, 2021

End Date

March 26, 2021

Page Count

13

Permanent URL

https://peer.asee.org/36359

Download Count

21

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Paper Authors

biography

Carolyn Fulton Schreiner University

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Ms. Fulton is currently an undergraduate research student of the Mathematics Department at Schreiner University in Kerrville, Texas. Her research interests include applied mathematics in the fields of biology, physics, and engineering.

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Brian P. Bernard Schreiner University

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Following receipt of his BSE in Mechanical Engineering from Tulane University, Brian Bernard served 7 years as a nuclear power officer in the submarine force of the US Navy, during which time he also taught 2 years in the Naval Science Dept at the University of Pennsylvania. Brian received his PhD in Mechanical Engineering from Duke University, and is currently an Associate Professor of Engineering at Schreiner University in Kerrville, TX. His technical research is in the field of non-linear dynamics and his educational research is in expanding engineering opportunities on liberal arts campuses.

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Brian P. Mann Duke University

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Dr. Brian Mann is an endowed Professor of Mechanical Engineering at Duke University. He received his BS degree in 1996 from the University of Missouri prior to accepting a position with McDonnell Douglas Corporation. Three years later, he accepted a position in the automotive industry with DaimlerChrysler and earned a M.S. degree at Washington University in St. Louis. Upon deciding to return for his D.Sc. degree, he was awarded the National Defense Science and Engineering Graduate Fellowship. He completed his D.Sc. degree at Washington University in 2003 and has held faculty positions at the University of Florida, University of Missouri, and Duke University. He has received several prestigious early career awards, such as the NSF CAREER Award from the National Science Foundation, the 2007 SAE Ralph Teetor Educator Award, and the Office of Naval Research Young Investigator Award. His present research interests include innovative applications of nonlinear systems theory, energy harvesting, and investigating the stabilizing/destabilizing influence of time delays in systems.

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Abstract

By modeling a piezoelectric cantilever beam system in which mechanical bistability emerges from repulsion between a stationary magnet and magnetic tip mass, the size of the basin of attraction for interwell oscillations is increased, so that the higher-energy solutions to the system may be more readily acquired than in previously studied systems. The primary drawback of linear energy harvesters is their very narrow frequency range. Non-linear harvesters provide wider operating frequency regions, but can have coexisting solutions, with the desirable high energy solution usually the more difficult to obtain. Existing work on bistable piezoelectric harvesting systems consider dipole interactions between the magnetic tip mass and an external magnet that is also oscillating at the experimental frequency. This paper demonstrates increased energy generation in transitions between the potential wells of the system through replacing the oscillating independent magnet with a stationary one. Optimizing the system to produce frequent well escapes induced by minimal disturbances from dipole interactions, frequency alterations, or changes in excitation amplitude will aide in achieving the high amplitude solutions of the system. Analytical evaluations of the energy in this system along with simulations of the behavior of the cantilever beam are performed for proof of concept that may be utilized in producing these high amplitude solutions in future experiments.

Fulton, C., & Bernard, B. P., & Mann, B. P. (2021, March), An Improved Magnetically Bistable Piezoelectric Energy Harvester Paper presented at ASEE 2021 Gulf-Southwest Annual Conference, Waco, Texas. https://peer.asee.org/36359

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