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Open AccessArticle

Investigating Polymer Fibre Optics for Condition Monitoring of Synthetic Mooring Lines

1
College of Engineering Mathematics and Physical Sciences, Penryn Campus, University of Exeter, Cornwall TR10 9FE, UK
2
Naval Architecture, Harbin Engineering University, Nantong Main Street 145, Nangang District, Harbin 150001, China
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2020, 8(2), 103; https://doi.org/10.3390/jmse8020103
Received: 30 December 2019 / Revised: 27 January 2020 / Accepted: 31 January 2020 / Published: 9 February 2020
(This article belongs to the Special Issue Monitoring of Coastal and Offshore Structures)
Synthetic mooring lines are becoming a popular alternative to conventional chain mooring systems. For marine renewable energy devices, they have been considered as an enabling technology for this nascent sector, given their reduced costs and ease of deployment. However, the extreme operating environment has led to an increased interest in the ‘in-situ’ condition monitoring of these mooring lines. This paper considers the use of polymer fibre optic technology and the optical time domain reflectometry (OTDR) technique for the condition monitoring of synthetic mooring lines. To establish the operating envelope of the fibres, Polymethylmethacrylate (PMMA) polymer optical fibres are mechanically tested. Additionally, an OTDR is used to monitor fibres whilst under elongation using a tensile test machine, and the sensitivity of the system in monitoring strain is established. At the lowest strain rate, the average proportional limit and yield points of the fibres are found at 1.16% strain and 5.41% strain, respectively. Fatigue exposure of fibres up to 1.25% strain identifies no measurable effect on fibres’ proportional limit or yield point. The occurrence of significant creep is identified for fibres strained beyond 1.5%. The OTDR system is able to identify strains at and above 4%. The study identifies important criteria that should be considered in the integration of polymer optical fibres for mooring applications. Limitations are discussed and suggestions for progressing this technology are provided. View Full-Text
Keywords: synthetic mooring system; condition monitoring; polymer optical fibre; PMMA; OTDR; reliability synthetic mooring system; condition monitoring; polymer optical fibre; PMMA; OTDR; reliability
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MDPI and ACS Style

Gordelier, T.; Thies, P.R.; Rinaldi, G.; Johanning, L. Investigating Polymer Fibre Optics for Condition Monitoring of Synthetic Mooring Lines. J. Mar. Sci. Eng. 2020, 8, 103.

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