Dissertation
An extensional mode resonator for vibration harvesting
Washington State University
Doctor of Philosophy (PhD), Washington State University
05/2009
DOI:
https://doi.org/10.7273/000006092
Abstract
In an effort to identify techniques for harvesting energy from ambient vibrations, a prototype device that utilizes stretching piezoelectric film to support a proof mass, with an adjustable support that allows the resonant frequency of the device to be easily altered has been developed. This extensional mode resonator (XMR) device is described by a model developed in this work that predicts the power that is harvested as a function of the frequency and amplitude of the external vibration, the elastic and piezoelectric materials properties, and the device geometry. The model provides design guidelines for the effects of device geometry and applied tension through an adjustable support that suggest a strong dependence on mechanical damping and a weak dependence on frequency, as opposed to a bending cantilever device. The model predictions are compared to experimental measures from multiple configurations of the prototype device for frequencies between 60 Hz and 180 Hz, and at accelerations between 0.1 m/s2 and 25 m/s2. Up to 22 mW is generated from a device with a mass of ~82 g at 25 m/s2 acceleration, and over the range of frequencies tested the power harvested at 4 m/s2 is between 3 mW and 4 mW. The developed models are used as design tools for various configurations that are capable of over 100 mW at less than 3 m/s2 in one case to another that can generate more than 10 mW at 1 m/s2. Prototype configurations have been successfully tested as high as 80 m/s2 with power generated on the order of 40 mW.
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Details
- Title
- An extensional mode resonator for vibration harvesting
- Creators
- John McKay Youngsman
- Contributors
- David F. Bahr (Chair)MICHAEL JON ANDERSON (Committee Member)David P Field (Committee Member) - Washington State University, School of Mechanical and Materials EngineeringM Grant Norton (Committee Member) - Washington State University, Honors College
- Awarding Institution
- Washington State University
- Academic Unit
- Voiland College of Engineering and Architecture
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Publisher
- Washington State University
- Number of pages
- 180
- Identifiers
- 99901055124101842
- Language
- English
- Resource Type
- Dissertation