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Design of Waveguide Bars for Transmitting a Pure Shear Horizontal Wave to Monitor High Temperature Components

Guided wave technique could be a possible method for monitoring components working in high temperature above 350 °C. However, this would require the design of an appropriate waveguide bar to transmit the wave, so that its sensing part is not influenced by the high temperature. In the present study,...

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Autores principales: Jia, Jiuhong, Wang, Qiyue, Liao, Zuoyu, Tu, Yun, Tu, Shan-Tung
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5615682/
https://www.ncbi.nlm.nih.gov/pubmed/28869554
http://dx.doi.org/10.3390/ma10091027
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author Jia, Jiuhong
Wang, Qiyue
Liao, Zuoyu
Tu, Yun
Tu, Shan-Tung
author_facet Jia, Jiuhong
Wang, Qiyue
Liao, Zuoyu
Tu, Yun
Tu, Shan-Tung
author_sort Jia, Jiuhong
collection PubMed
description Guided wave technique could be a possible method for monitoring components working in high temperature above 350 °C. However, this would require the design of an appropriate waveguide bar to transmit the wave, so that its sensing part is not influenced by the high temperature. In the present study, the shape of waveguide bars is designed based on the analysis of wave source characteristics. The critical frequency-width and frequency-thickness products of waveguide bars are analyzed theoretically and numerically to transmit the zeroth shear horizontal wave SH0* in bars. The results show that waveguide bars can cut off all the other wave modes when their frequency-thickness products are smaller than the critical value fd*, and frequency-width products are not smaller than the critical value fw*. Six waveguide bars are designed and fabricated based on the design criteria, and an experiment system is set up to check their work performance. The testing results indicate that the wave signals of the SH0* mode propagate clearly in waveguide bars, and cut off all the other modes when the frequency-thickness products and frequency-width products of the bars meet the design criteria. It is also demonstrated that the dependency of the experimental group velocity of each waveguide bar on frequency is in good agreement with the numerical result. High-temperature experiments also validate the reliability of the designed waveguide bars. Therefore, the critical frequency-thickness product and frequency-width product can be the basis for the design of the waveguide bars.
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spelling pubmed-56156822017-09-28 Design of Waveguide Bars for Transmitting a Pure Shear Horizontal Wave to Monitor High Temperature Components Jia, Jiuhong Wang, Qiyue Liao, Zuoyu Tu, Yun Tu, Shan-Tung Materials (Basel) Article Guided wave technique could be a possible method for monitoring components working in high temperature above 350 °C. However, this would require the design of an appropriate waveguide bar to transmit the wave, so that its sensing part is not influenced by the high temperature. In the present study, the shape of waveguide bars is designed based on the analysis of wave source characteristics. The critical frequency-width and frequency-thickness products of waveguide bars are analyzed theoretically and numerically to transmit the zeroth shear horizontal wave SH0* in bars. The results show that waveguide bars can cut off all the other wave modes when their frequency-thickness products are smaller than the critical value fd*, and frequency-width products are not smaller than the critical value fw*. Six waveguide bars are designed and fabricated based on the design criteria, and an experiment system is set up to check their work performance. The testing results indicate that the wave signals of the SH0* mode propagate clearly in waveguide bars, and cut off all the other modes when the frequency-thickness products and frequency-width products of the bars meet the design criteria. It is also demonstrated that the dependency of the experimental group velocity of each waveguide bar on frequency is in good agreement with the numerical result. High-temperature experiments also validate the reliability of the designed waveguide bars. Therefore, the critical frequency-thickness product and frequency-width product can be the basis for the design of the waveguide bars. MDPI 2017-09-04 /pmc/articles/PMC5615682/ /pubmed/28869554 http://dx.doi.org/10.3390/ma10091027 Text en © 2017 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Jia, Jiuhong
Wang, Qiyue
Liao, Zuoyu
Tu, Yun
Tu, Shan-Tung
Design of Waveguide Bars for Transmitting a Pure Shear Horizontal Wave to Monitor High Temperature Components
title Design of Waveguide Bars for Transmitting a Pure Shear Horizontal Wave to Monitor High Temperature Components
title_full Design of Waveguide Bars for Transmitting a Pure Shear Horizontal Wave to Monitor High Temperature Components
title_fullStr Design of Waveguide Bars for Transmitting a Pure Shear Horizontal Wave to Monitor High Temperature Components
title_full_unstemmed Design of Waveguide Bars for Transmitting a Pure Shear Horizontal Wave to Monitor High Temperature Components
title_short Design of Waveguide Bars for Transmitting a Pure Shear Horizontal Wave to Monitor High Temperature Components
title_sort design of waveguide bars for transmitting a pure shear horizontal wave to monitor high temperature components
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5615682/
https://www.ncbi.nlm.nih.gov/pubmed/28869554
http://dx.doi.org/10.3390/ma10091027
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