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Research on Strain Measurements of Core Positions for the Chinese Space Station

The Chinese space station is designed to carry out manned spaceflight, space science research, and so on. In serious applications, it is a common operation to inject gas into the hull, which can produce strain of the bulkhead. Accurate measurement of strain for the bulkhead is one of the key tasks i...

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Autores principales: Shen, Jingshi, Zeng, Xiaodong, Luo, Yuxiang, Cao, Changqing, Wang, Ting
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6021825/
https://www.ncbi.nlm.nih.gov/pubmed/29874847
http://dx.doi.org/10.3390/s18061834
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author Shen, Jingshi
Zeng, Xiaodong
Luo, Yuxiang
Cao, Changqing
Wang, Ting
author_facet Shen, Jingshi
Zeng, Xiaodong
Luo, Yuxiang
Cao, Changqing
Wang, Ting
author_sort Shen, Jingshi
collection PubMed
description The Chinese space station is designed to carry out manned spaceflight, space science research, and so on. In serious applications, it is a common operation to inject gas into the hull, which can produce strain of the bulkhead. Accurate measurement of strain for the bulkhead is one of the key tasks in evaluating the health condition of the space station. This is the first work to perform strain detection for the Chinese space station bulkhead by using optical fiber Bragg grating. In the period of measurements, the resistance strain gauge is used as the strain standard. The measurement error of the fiber optical sensor in the circumferential direction is very small, being less than 4.52 με. However, the error in the axial direction is very large with the highest value of 28.93 με. Because the measurement error of bare fiber in the axial direction is very small, the transverse effect of the substrate of the fiber optical sensor likely plays a role. The comparison of the theoretical and experimental results of the transverse effect coefficients shows that they are fairly consistent, with values of 0.0271 and 0.0287, respectively. After the transverse effect is compensated, the strain deviation in the axial detection is smaller than 2.04 με. It is of great significance to carry out real-time health assessment for the bulkhead of the space station.
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spelling pubmed-60218252018-07-02 Research on Strain Measurements of Core Positions for the Chinese Space Station Shen, Jingshi Zeng, Xiaodong Luo, Yuxiang Cao, Changqing Wang, Ting Sensors (Basel) Article The Chinese space station is designed to carry out manned spaceflight, space science research, and so on. In serious applications, it is a common operation to inject gas into the hull, which can produce strain of the bulkhead. Accurate measurement of strain for the bulkhead is one of the key tasks in evaluating the health condition of the space station. This is the first work to perform strain detection for the Chinese space station bulkhead by using optical fiber Bragg grating. In the period of measurements, the resistance strain gauge is used as the strain standard. The measurement error of the fiber optical sensor in the circumferential direction is very small, being less than 4.52 με. However, the error in the axial direction is very large with the highest value of 28.93 με. Because the measurement error of bare fiber in the axial direction is very small, the transverse effect of the substrate of the fiber optical sensor likely plays a role. The comparison of the theoretical and experimental results of the transverse effect coefficients shows that they are fairly consistent, with values of 0.0271 and 0.0287, respectively. After the transverse effect is compensated, the strain deviation in the axial detection is smaller than 2.04 με. It is of great significance to carry out real-time health assessment for the bulkhead of the space station. MDPI 2018-06-05 /pmc/articles/PMC6021825/ /pubmed/29874847 http://dx.doi.org/10.3390/s18061834 Text en © 2018 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
Shen, Jingshi
Zeng, Xiaodong
Luo, Yuxiang
Cao, Changqing
Wang, Ting
Research on Strain Measurements of Core Positions for the Chinese Space Station
title Research on Strain Measurements of Core Positions for the Chinese Space Station
title_full Research on Strain Measurements of Core Positions for the Chinese Space Station
title_fullStr Research on Strain Measurements of Core Positions for the Chinese Space Station
title_full_unstemmed Research on Strain Measurements of Core Positions for the Chinese Space Station
title_short Research on Strain Measurements of Core Positions for the Chinese Space Station
title_sort research on strain measurements of core positions for the chinese space station
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6021825/
https://www.ncbi.nlm.nih.gov/pubmed/29874847
http://dx.doi.org/10.3390/s18061834
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