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Synthetic rope responses in the context of load history: Operational performance ArchiMer
Weller, S.d.; Davies, Peter; Vickers, A. W.; Johanning, L..
The utilisation of synthetic mooring ropes for marine renewable energy (MRE) devices is a recent occurrence. Despite current use in the offshore industry, MRE mooring components are typically subjected to highly dynamic loads, necessitating the detailed characterisation of operational and long-term component performance for lifecycle analysis and operations management. To address the uncertainties associated with synthetic mooring components in this application, tension experiments have been conducted on nylon 6 parallel-stranded rope samples at IFREMER, France and the University of Exeter, UK under the consortium MERiFIC (Marine Energy in Far Peripheral and Island Communities). Measurements are reported from harmonic loading tests with different initial...
Tipo: Text Palavras-chave: Synthetic mooring line; Nylon 6; Parallel-strand rope; Load history; Operational performance.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00186/29677/35798.pdf
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Synthetic rope responses in the context of load history: The influence of aging ArchiMer
Weller, Samuel; Davies, Peter; Vickers, A. W.; Johanning, L..
In order to design marine renewable energy mooring systems which are both economical and durable it is necessary to establish the lifecycle performance of individual components. In parallel with numerical tool development, physical component testing utilising realistic load cases is pivotal in achieving a greater understanding of performance variations including the contribution of degradation mechanisms. Building upon previous experimental tests conducted by the authors, tension–tension tests were conducted on a sample used in first part of the study and samples extracted from a mooring line which was deployed for 18 months with the South West Mooring Test Facility. In agreement with the first part of the study it was found that sample axial stiffness and...
Tipo: Text Palavras-chave: Synthetic mooring rope; Nylon; Marine renewable energy (MRE) device; Load history; Operational and long-term performance; Damage.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00250/36120/35799.pdf
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Assessing the performance durability of elastomeric moorings: Assembly investigations enhanced by sub-component tests ArchiMer
Gordelier, T.; Parish, D.; Thies, P. R.; Weller, S.; Davies, Peter; Le Gac, Pierre-yves; Johanning, L..
The growing marine renewable energy sector has led to a demand for increasingly compliant mooring systems. In response, several innovative mooring tethers have been proposed demonstrating potential customisation to the stiffness profile and reduced peak mooring loads. Many of these novel systems utilise materials in a unique application within the challenging marine environment and their long term durability remains to be proven. This paper presents a multifaceted investigation into the durability of a novel polyester mooring tether with an elastomeric core. Laboratory based functionality tests are repeated on tether assemblies following a 6 month sea deployment. Results show a 45% average increase in dynamic axial stiffness. This is supported by high...
Tipo: Text Palavras-chave: Marine energy; Mooring; Elastomer; Durability; EPDM; Component testing.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00434/54605/55987.pdf
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Synthetic mooring ropes for marine renewable energy applications ArchiMer
Weller, Samuel; Johanning, L.; Davies, Peter; Banfield, S. J..
Synthetic mooring ropes have a proven track record of use in harsh operating conditions over the past two decades. As one of the main users of ropes for permanent mooring systems, the oil and gas industry has opted for these components because they possess performance characteristics and economies of scale which are in many respects superior to steel components. Given this accrued experience, it is unsurprising that several marine renewable energy (MRE) device developers have utilised synthetic ropes, motivated by the need to specify economical, reliable and durable mooring systems. Whilst these components are potentially an enabling technology for the MRE sector, this is a new field of application which can feature highly dynamic mooring tensions and...
Tipo: Text Palavras-chave: Synthetic mooring ropes Marine renewable energy Material properties Classification and testing Installation; Operation and maintenance Inspection.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00266/37750/36082.pdf
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Numerical model validation for mooring systems: Method and application for wave energy converters ArchiMer
Harnois, V.; Weller, Sam D.; Johanning, L.; Thies, P. R.; Le Boulluec, Marc; Le Roux, Dominique; Soule, Veronique; Ohana, Jeremy.
The design of wave energy mooring systems is challenging: overdesign incurs a significant cost penalty, underdesign may lead to a premature failure and incorrect design could reduce the power production. Consequently, compliant mooring systems are being developed for wave energy applications. This paper presents tank test results for a scale model of the buoy and mooring used at the SouthWest Mooring Test Facility (SWMTF), an offshore facility developed to conduct long-term sea trials for wave energy device moorings. A compliant three leg catenary mooring system using Nylon ropes in the water column is investigated. Preliminary static, quasi-static, decay, regular and irregular wave tests were conducted on the 1:5 scale model, using the Ifremer basin in...
Tipo: Text Palavras-chave: Wave energy converter; Tank tests; Numerical model; Highly dynamic mooring system; Fibre rope.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00233/34375/35785.pdf
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