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Brillouin-zone characterization of piezoelectric material intrinsic energy-harvesting availability
Smart Materials and Structures, Volume: 30, Issue: 8, Start page: 085022
Swansea University Authors: Jatin Patrick, Sondipon Adhikari
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DOI (Published version): 10.1088/1361-665x/ac0c2c
Abstract
Vibration energy harvesting is an emerging technology that enables electric power generation using piezoelectric devices. The prevailing approach for characterization of the energy-harvesting capacity in these devices is to consider a finite structure operating under forced vibration conditions. Her...
| Published in: | Smart Materials and Structures |
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| ISSN: | 0964-1726 1361-665X |
| Published: |
IOP Publishing
2021
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa57502 |
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| Abstract: |
Vibration energy harvesting is an emerging technology that enables electric power generation using piezoelectric devices. The prevailing approach for characterization of the energy-harvesting capacity in these devices is to consider a finite structure operating under forced vibration conditions. Here, we present an alternative framework whereby the intrinsic energy-harvesting characteristics are formally quantified independent of the forcing and the structure size. In doing so, we consider the notion of a piezoelectric material rather than a finite piezoelectric structure. As an example, we consider a suspended piezoelectric phononic crystal to which we apply Bloch's theorem and formally quantify the energy-harvesting characteristics within the span of the unit cell's Brillouin zone (BZ). In the absence of shunted piezoelectric circuits, the wavenumber-dependent dissipation of the phononic crystal is calculated and shown to increase, as expected, with the level of prescribed damping. With the inclusion of the piezoelectric elements, the wavenumber-dependent dissipation rises by an amount proportional to the energy available for harvest which upon integration over the BZ and summing over all branches yields a quantity representative of the net available energy for harvesting. We investigate both monoatomic and diatomic phononic crystals and piezoelectric elements with and without an inductor. The paper concludes with a parametric design study yielding optimal piezoelectric element properties in terms of the proposed intrinsic energy-harvesting availability measure. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
8 |
| Start Page: |
085022 |