Methodology for modeling and service life monitoring of mooring lines of floating wind turbines

Pham, Hong-Duc; Schoefs, Franck; Cartraud, Patrice; Soulard, Thomas; Pham, Hien-Hau; Berhault, C.

doi:10.1016/j.oceaneng.2019.106603

Cited by 16 publications

(8 citation statements)

References 22 publications

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“…Floatgen has a reinforced concrete foundation designed by Ideol. The foundation is designed as a barge to improve its stability [16] while the damping pool in the central opening of foundation is used to suppress foundation's wave-frequency motions. The dimensions of the square-ring shaped foundation are 36 m in breadth, 9.5 m in height and 7.5 m in draft.…”

Section: Taut Mooringmentioning

confidence: 99%

Current Status and Future Trends for Mooring Systems of Floating Offshore Wind Turbines

et al. 2022

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With the increasing demand of energy and the limitation of bottom-fixed wind turbines in moderate and deep waters, floating offshore wind turbines are doomed to be the right technical choice and they are bound to enter a new era of rapid development. The mooring system is a vital system of a floating wind turbine for station-keeping under harsh environmental conditions. In terms of existing floating wind turbine projects, this paper is devoted to discussing the current status of mooring systems and mooring equipment. This paper also presents the mooring analysis methods and points out the technical difficulties and challenges in mooring design, installation, operation and maintenance stages. Finally, the developing trends of the mooring system are summarized, aiming to provide a reference for future mooring research.

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Section: Taut Mooringmentioning

confidence: 99%

Current Status and Future Trends for Mooring Systems of Floating Offshore Wind Turbines

et al. 2022

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“…The frequency domain analysis employs frequency response to analyze the response characteristics of the floating body under the effect of wave force. After having studied the effect of viscous force on the floating body, Lopes found that the acting force that the viscous force-in contrast with wave force and the power take off system-has applied to the floating body can be negligible [18][19][20]. The research carried out by Muliawan and Vicente indicates that the force produced by relaxed moorings hardly affects the way the floating body absorbs the energy of the wave [21].…”

Section: The Frequency Domain Analysis Of Devicementioning

confidence: 99%

Mooring Stability Study for Novel Wave Energy Converter Based on Regular Wave

Meng

Chen

Liu

et al. 2021

JMSE

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The mooring system not only plays a vital role in keeping wave energy generators floating stably, but also affects the success of engineering design. Combining wave force theory and the hydrological data obtained from the field measurements of a certain sea area in the Bohai Sea, the Stokes second-order wave theory was adopted to design the mooring system of a new type of power-generating device. At the same time, the study uses the Aqwa software to gather the dynamic data of a power-generating device in a real test, and then makes models and carries out regular wave tests so as to verify the viability of the mooring system and the stability of the whole power-generating device. All of this work will provide a theoretical basis for the manufacture of an engineering prototype and its reliable supply of power.

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“…The structural integrity of floating structures has become an essential issue in the marine and offshore oil/gas industry in the last century [1][2][3]. Moreover, the reliability of fixed and floating renewable energy structures, which have emerged as a new field in the last decades, is also significantly discussed [4][5][6][7][8][9][10][11]. One of the most critical issues in the structural integrity of floating offshore structures is the safety of mooring systems and accessories (connectors) [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Marine Corrosion and Tribocorrosion Resistance of Offshore Mooring Chain Steel by Aluminizing Process

Alkan

2022

Brodogradnja

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The safety of mooring systems and accessories is one of the most critical issues in the structural integrity of floating oil/gas and renewable offshore structures. Mooring chains and accessories operate under dynamic conditions in harsh marine environments. They are subject to severe wear and corrosion between their links due to relative movement from waves, wind, and ocean currents that disrupt structural integrity. To cope with this problem, the pack-aluminizing process was applied on the R4 grade offshore mooring chain steel for 2 h at 850 °C to improve corrosion and wear-corrosion (tribocorrosion) resistance in 3.5% NaCl. The tribocorrosion behaviour of untreated and aluminized samples was investigated by a tribo-electrochemical setup that simultaneously allows for collecting the wear and corrosion data. Potentiodynamic and potentiostatic corrosion and tribocorrosion tests were carried out to understand corrosion kinetics. Optical, SEM, XRD and EDS analyses were performed to characterize the aluminide layer and surface morphologies before and after tribocorrosion investigations. In polarization scans under corrosion and tribocorrosion conditions, the current showed a significant activation stretch of several orders of magnitude, with minor potential changes in the anodic region. Due to the galvanic effects of sliding under natural electrochemical conditions, the untreated R4 alloy exhibited cathodic properties in the wear track, while the aluminium coating was out of the wear track due to its oxide-forming ability. At the cathodic potential, two hard Al2O3 materials under pure mechanical effects and third bodies emerging from cracks on the coating surface increase the friction coefficient (COF), while the oxide product film, which has a lubricating ability and pits which reduces the contact area, caused a decrease in COF at the high anodic potential. The study revealed that while the aluminide layer improved the corrosion and tribological character of R4 alloy, material loss from wear track increased due to micro fractures and cracks in the coating layer during sliding tribocorrosion conditions.

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Methodology for modeling and service life monitoring of mooring lines of floating wind turbines

Cited by 16 publications

References 22 publications

Current Status and Future Trends for Mooring Systems of Floating Offshore Wind Turbines

Current Status and Future Trends for Mooring Systems of Floating Offshore Wind Turbines

Mooring Stability Study for Novel Wave Energy Converter Based on Regular Wave

Enhancement of Marine Corrosion and Tribocorrosion Resistance of Offshore Mooring Chain Steel by Aluminizing Process

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