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Mechanical Reliability Analysis of Flexible Power Cables for Marine Energy
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.ORCID iD: 0000-0002-6730-0214
Chalmers University of Technology, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics. Chalmers University of Technology, Sweden.ORCID iD: 0000-0001-7182-0872
Chalmers University of Technology, Sweden.
2022 (English)In: Journal of Marine Science and Engineering, E-ISSN 2077-1312, Vol. 10, no 6, article id 716Article in journal (Refereed) Published
Abstract [en]

Marine power cables connected to moving devices at sea may experience millions of load cycles per year, and thus they need to be flexible due to the movements of the cable and designed for mechanical loads. In this study, the focus is on the mechanical life of flexible low-and medium voltage power cables connecting devices to hubs. The reliability design method Variational Mode and Effect Analysis (VMEA) is applied, based on identifying and quantifying different types of uncertainty sources, including scatter, model and statistical uncertainties. It implements a load–strength approach that combines numerical simulations to assess the loads on the cable and experimental tests to assess the strength of the cable. The VMEA method is demonstrated for an evaluation of bending fatigue, and is found to be a useful tool to evaluate uncertainties in fatigue life for WEC (Wave Energy Converter) system cables during the design phase. The results give a firm foundation for the evaluation of safety against fatigue and are also helpful for identifying weak spots in the reliability assessment, thereby motivating actions in the improvement process. Uncertainties in terms of scatter, statistical uncertainty and model uncertainty are evaluated with respect to the WaveEL 3.0, a WEC designed by the company Waves4Power, and deployed in Runde, Norway. A major contribution to the overall uncertainty is found to originate from the fatigue life model, both in terms of scatter and model uncertainty. © 2022 by the authors. 

Place, publisher, year, edition, pages
MDPI , 2022. Vol. 10, no 6, article id 716
Keywords [en]
experimental test, fatigue life, numerical simulation, power cable, reliability, uncertainty, VMEA (Variation Mode and Effect Analysis), wave energy
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:ri:diva-60126DOI: 10.3390/jmse10060716Scopus ID: 2-s2.0-85131604086OAI: oai:DiVA.org:ri-60126DiVA, id: diva2:1696363
Note

Funding details: Chalmers Tekniska Högskola; Funding details: Energimyndigheten, 36357-2, 41240-1; Funding details: Stiftelsen Chalmers tekniska högskola, Chalmers'; Funding text 1: Funding: The research was partially funded by strategic internal funding from Chalmers University of Technology and from RISE Research Institutes of Sweden, from Chalmers University of Technology Foundation for the strategic research project “Hydro-and aerodynamics”, and by the Swedish Energy Agency projects “R&D of dynamic low voltage cables between the buoy and floating hub in a marine energy system” under contract No. 41240-1, and “Simulation model for operation and maintenance strategy of floating wave energy converters–analysis of fatigue, wear, and influence of biofouling for effective and profitable energy harvesting” under contract No. 36357-2.

Available from: 2022-09-16 Created: 2022-09-16 Last updated: 2023-06-07Bibliographically approved

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Johannesson, PärJohnson, Erland

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