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Vibration of a Liquid Crystal Elastomer Spring Oscillator under Periodic Electrothermal Drive
The oscillations of electrically actuated thermally-responsive liquid crystal elastomer (LCE) microfibers under cyclic electric actuation have been discovered in recent experiments. Periodic electric actuation is a common method of active control with potential applications in the fields of micro-ac...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10346335/ https://www.ncbi.nlm.nih.gov/pubmed/37447468 http://dx.doi.org/10.3390/polym15132822 |
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author | Li, Kai Lou, Jiangfeng Hu, Shaofei Dai, Yuntong Wang, Fei Yu, Yong |
author_facet | Li, Kai Lou, Jiangfeng Hu, Shaofei Dai, Yuntong Wang, Fei Yu, Yong |
author_sort | Li, Kai |
collection | PubMed |
description | The oscillations of electrically actuated thermally-responsive liquid crystal elastomer (LCE) microfibers under cyclic electric actuation have been discovered in recent experiments. Periodic electric actuation is a common method of active control with potential applications in the fields of micro-actuators. In this paper, the vibration behavior of LCE spring oscillator under periodic electrothermal drive is studied theoretically. Based on the dynamic LCE model, the dynamic governing equation of the LCE spring oscillator is established, and the time history curves of the vibration are obtained by numerical calculations. The results show that the periodic electrothermal drive can cause periodic vibration of the LCE spring oscillator. With the increase of time rate, the vibration amplitude increases first and then decreases. In a small damping system, there exist optimal sets of electrothermal drive period and electrothermal drive time rate to maximize the system amplitude. For the optimum periodic mode, the vibration amplitude of the spring oscillator is affected by the current heat, damping coefficient, gravital acceleration, spring constant and shrinkage coefficient, but not by the initial velocity. The application examples of LCE materials show that periodic electrothermally driven LCEs have promising applications. The results of this study are instructive for the design of soft robots and LCE-based electric locomotives. |
format | Online Article Text |
id | pubmed-10346335 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-103463352023-07-15 Vibration of a Liquid Crystal Elastomer Spring Oscillator under Periodic Electrothermal Drive Li, Kai Lou, Jiangfeng Hu, Shaofei Dai, Yuntong Wang, Fei Yu, Yong Polymers (Basel) Article The oscillations of electrically actuated thermally-responsive liquid crystal elastomer (LCE) microfibers under cyclic electric actuation have been discovered in recent experiments. Periodic electric actuation is a common method of active control with potential applications in the fields of micro-actuators. In this paper, the vibration behavior of LCE spring oscillator under periodic electrothermal drive is studied theoretically. Based on the dynamic LCE model, the dynamic governing equation of the LCE spring oscillator is established, and the time history curves of the vibration are obtained by numerical calculations. The results show that the periodic electrothermal drive can cause periodic vibration of the LCE spring oscillator. With the increase of time rate, the vibration amplitude increases first and then decreases. In a small damping system, there exist optimal sets of electrothermal drive period and electrothermal drive time rate to maximize the system amplitude. For the optimum periodic mode, the vibration amplitude of the spring oscillator is affected by the current heat, damping coefficient, gravital acceleration, spring constant and shrinkage coefficient, but not by the initial velocity. The application examples of LCE materials show that periodic electrothermally driven LCEs have promising applications. The results of this study are instructive for the design of soft robots and LCE-based electric locomotives. MDPI 2023-06-26 /pmc/articles/PMC10346335/ /pubmed/37447468 http://dx.doi.org/10.3390/polym15132822 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Li, Kai Lou, Jiangfeng Hu, Shaofei Dai, Yuntong Wang, Fei Yu, Yong Vibration of a Liquid Crystal Elastomer Spring Oscillator under Periodic Electrothermal Drive |
title | Vibration of a Liquid Crystal Elastomer Spring Oscillator under Periodic Electrothermal Drive |
title_full | Vibration of a Liquid Crystal Elastomer Spring Oscillator under Periodic Electrothermal Drive |
title_fullStr | Vibration of a Liquid Crystal Elastomer Spring Oscillator under Periodic Electrothermal Drive |
title_full_unstemmed | Vibration of a Liquid Crystal Elastomer Spring Oscillator under Periodic Electrothermal Drive |
title_short | Vibration of a Liquid Crystal Elastomer Spring Oscillator under Periodic Electrothermal Drive |
title_sort | vibration of a liquid crystal elastomer spring oscillator under periodic electrothermal drive |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10346335/ https://www.ncbi.nlm.nih.gov/pubmed/37447468 http://dx.doi.org/10.3390/polym15132822 |
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