Including moorings in the assessment of a generic offshore wave energy converter: A frequency domain approach

Fitzgerald, John; Bergdahl, Lars

doi:10.1016/j.marstruc.2007.09.004

Cited by 77 publications

(68 citation statements)

References 9 publications

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“…Given this context signi cant uncertainties exist about the application of synthetic ropes for MRE devices and it is essential that the operational and long-term performance of mooring components is quanti ed to enable predictions to be made regarding fatigue life and capacity to withstand extreme loads [14]. The mooring response will be in uenced by the physical properties of components within the system (mass, geometry, axial sti ness and damping) [8,15] as well as other loading mechanisms (i.e. viscous drag and added mass).…”

Section: Introductionmentioning

confidence: 99%

Synthetic rope responses in the context of load history: Operational performance

et al. 2014

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The utilisation of synthetic mooring ropes for marine renewable energy (MRE) devices is a recent occurrence. Despite current use in the o shore 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 di erent initial bedding-in levels used to investigate the in uence of load history on the immediate dynamic properties of the rope. Two irregular load regimes were also applied based on mooring tensions recorded by the South West Mooring Test Facility (SWMTF). Datasets are provided to facilitate the development of rope modelling tools. For the load regimes studied it was found that the operational performance of the rope is strongly in uenced by the instantaneous load-strain characteristic. This study provides unique insight into the sti ness and damping properties of synthetic rope in the context of loading regimes relevant to MRE devices.

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Section: Introductionmentioning

confidence: 99%

Synthetic rope responses in the context of load history: Operational performance

et al. 2014

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“…The mooring system restraints the motion of the floating devices, yet has to be compliant enough to allow the motion for energy conversion. The load response of different mooring configurations for floating MECs is being researched (Johanning et al, 2006(Johanning et al, , 2007Fitzgerald and Bergdahl, 2008) …”

Section: Methodology For Fatigue Load Analysis and Predictionmentioning

confidence: 99%

Mooring line fatigue damage evaluation for floating marine energy converters: Field measurements and prediction

et al. 2014

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The vision of large-scale commercial arrays of floating marine energy converters (MECs) necessitates the robust, yet cost-effective engineering of devices. Given the continuous environmental loading, fatigue has been identified as one of the key engineering challenges. In particular the mooring system which warrants the station-keeping of such devices is subject to highly cyclic, non-linear load conditions, mainly induced by the incident waves.To ensure the integrity of the mooring system the lifecycle fatigue spectrum must be predicted in order to compare the expected fatigue damage against the design limits. The fatigue design of components is commonly assessed through numerical modelling of representative load cases. However, for new applications such as floating marine energy converters numerical models are often scantily validated. This paper describes an approach where load measurements from largescale field trials at the South West Mooring Testing Facility (SWMTF) are used to calculate and predict the fatigue damage. The described procedure * corresponding author, Tel.: +44 (0)

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“…The unknown coefficients α could be determined by Garrett's method [21][22][23][24][25][26] , according to matching the potential and its normal derivative on the surface of concatenate boundaries, which is shared by the subdomains.…”

Section: Hydrodynamic Analysismentioning

confidence: 99%

Nonlinear PTO Effect on Performance of Vertical Axisymmetric Wave Energy Converter Using Semi-Analytical Method

Liu

Zheng

et al. 2017

Polish Maritime Research

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Including moorings in the assessment of a generic offshore wave energy converter: A frequency domain approach

Cited by 77 publications

References 9 publications

Synthetic rope responses in the context of load history: Operational performance

Synthetic rope responses in the context of load history: Operational performance

Mooring line fatigue damage evaluation for floating marine energy converters: Field measurements and prediction

Nonlinear PTO Effect on Performance of Vertical Axisymmetric Wave Energy Converter Using Semi-Analytical Method

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