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Open AccessArticle

A Novel Design and Performance Results of An Electrically Tunable Piezoelectric Vibration Energy Harvester (TPVEH)

Department of Civil Engineering, University of Victoria, ECS 314, 3800 Finnerty Road, Victoria, BC V8W 3P6, Canada
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J. Compos. Sci. 2020, 4(2), 39; https://doi.org/10.3390/jcs4020039
Received: 31 March 2020 / Revised: 16 April 2020 / Accepted: 16 April 2020 / Published: 19 April 2020
(This article belongs to the Special Issue Metal Composites)
The need for energy harvesters for various applications, including structural health monitoring (SHM) in remote and inaccessible areas, is well established. Energy harvesters can utilize the ambient vibration of the body on which they are mounted to generate energy, thus eliminating the need for an external source of power. One such type of harvester is designed using piezoelectric materials and using a cantilever type set-up. However, the challenge associated with cantilever-based Piezoelectric Vibration Energy Harvesters (PVEH) is that its output power reduces when the ambient vibration frequency deviates from the resonant frequency of the harvester. This calls for a mechanism to tune its resonant frequency to match with the ambient frequency. This article presents an innovative design of an electrically tunable PVEH. The PVEH is integrated with an Ionic Polymer Metal Composite (IPMC) as an actuator that loads the cantilever beam, changing the stiffness of the beam. IPMC utilizes low power, and the authors demonstrate in this paper that a net gain of power can be achieved by this novel design. For the configuration used, it is experimentally proven that a frequency shift from 5.9 Hz to 8 Hz is achieved with three actuation values. Typical power output from the harvester is 52.03 µW when the power spent on actuation is only 0.765 µW. On-going modeling of this system using simulation software is expected to lead to further optimization and prototyping of design. View Full-Text
Keywords: energy harvesting; vibration; piezoelectric material; ionic polymer-metal composite; bandwidth energy harvesting; vibration; piezoelectric material; ionic polymer-metal composite; bandwidth
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MDPI and ACS Style

Raghavan, S.; Gupta, R. A Novel Design and Performance Results of An Electrically Tunable Piezoelectric Vibration Energy Harvester (TPVEH). J. Compos. Sci. 2020, 4, 39.

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