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Biofouling on mooring lines and power cables used in wave energy converter systems - analysis of fatigue life and energy performance
Chalmers University of Technology, Gothenburg, Sweden.
Chalmers University of Technology, Gothenburg, Sweden.
RISE - Research Institutes of Sweden, Safety and Transport, Safety. Chalmers University of Technology, Gothenburg, Sweden.ORCID iD: 0000-0001-7182-0872
Newcastle University, School of Marine Science and Technology, Newcastle upon Tyne, United Kingdom.
2017 (English)In: Applied Ocean Research, ISSN 0141-1187, E-ISSN 1879-1549, Vol. 65, 166-177 p.Article in journal (Refereed) Published
Abstract [en]

This study presents an analysis of a wave energy converter (WEC) system consisting of a buoy, a mooring system, and a power cable connected to a hub. The investigated WEC system is currently under full-scale testing near Runde in Norway. The purpose of the study was to investigate the characteristics of the entire system, primarily with regard to energy performance and the fatigue life of the mooring lines and power cable, considering the effects of marine biofouling and its growth on the system’s components. By means of parametric study, the energy performance and fatigue life of the mooring lines and power cable were investigated considering two mooring configurations, three biofouling conditions, four sea states in a scatter diagram, and three wave and current directions. Hydrodynamic and structural response simulations were conducted in a coupled response analysis using the DNV-GL software SESAM. Energy performance analyses and stress-based rainflow counting fatigue calculations were performed separately using an in-house code. The results show that, for a WEC system which has been deployed for 25 years, biofouling can reduce the total power absorption by up to 10% and decrease the fatigue life of the mooring lines by approximately 20%

Place, publisher, year, edition, pages
2017. Vol. 65, 166-177 p.
Keyword [en]
Biofouling; Catenary mooring chain; Fatigue; Power absorption; Power cable; Wave energy converter
National Category
Vehicle Engineering Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-30015DOI: 10.1016/j.apor.2017.04.002OAI: oai:DiVA.org:ri-30015DiVA: diva2:1117886
Available from: 2017-06-29 Created: 2017-06-29 Last updated: 2017-08-23Bibliographically approved

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v. 2.29.1