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Cross-shaped piezoelectric beam for torsion sensing

Authors
Kim, HojoonLim, MyotaegCha, Youngsu
Issue Date
1월-2020
Publisher
IOP PUBLISHING LTD
Keywords
piezoelectric material; sensor; torsional loading
Citation
SMART MATERIALS AND STRUCTURES, v.29, no.1
Indexed
SCIE
SCOPUS
Journal Title
SMART MATERIALS AND STRUCTURES
Volume
29
Number
1
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/58517
DOI
10.1088/1361-665X/ab55ff
ISSN
0964-1726
Abstract
In this paper, we introduce a cross-shaped piezoelectric beam that consists of two piezoelectric layers and polyester film as a substrate. We derive the modeling framework using the slender plate assumption to anticipate mechanical deformation caused by torsional loading. Also, we obtain a theoretical calculation of the electrical responses of the piezoelectric layers based on the mechanical deformation of a slender plate. To demonstrate the validity of the theoretical model, a series of experiments are designed to deliver torsional loadings to the cross-shaped piezoelectric beam. By comparing the amplitudes and phases of the experimental load voltages with the theoretical ones, torsional loading with various tip twisting angles and frequencies could be distinguished. In addition, we conduct a comparison between the torsional loading and the flexural loading applied to the cross-shaped piezoelectric beam. As a result, we found that the torsional loading can be differentiated from the flexural loading using the phase difference between the two piezoelectric layers. For further study, we experimentally and theoretically investigate the open-circuit voltages of the piezoelectric sensors. We observed that the open-circuit voltage amplitudes were proportional to the tip twisting angle, and remained constant with the change in frequency.
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Lim, Myo taeg
공과대학 (전기전자공학부)
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