Design of Mooring Lines of a Floating Offshore Wind Turbine in South Offshore Area of Jeju

This paper presents effect of aerodynamic loads on mooring line responses of a floating offshore wind turbine. A Matlab code based on blade element momentum (BEM) theory is developed to consider aerodynamic loads acting on NREL 5MW wind turbine. The aerodynamic loads are coupled with time-domain hydrodynamic analyses using one-way interaction scheme of the wave and wind loads. A semi-submersible floating platform which is from Offshore Code Comparison Collaborative Continuation(OC4) DeepCWind platform is used with catenary mooring lines simply composed of studless chain links. Average values of mooring peak tensions obtained from aerodynamic load consideration are significantly increased compared to those from simple wind drag force consideration.Consideration of aerodynamic loads also yield larger tension ranges which can be important factor to reduce fatigue life of the mooring lines.

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Extreme Mooring Analysis of Turret Moored LNG-FSRU

Lee¹,

Jung²,

Park³

et al. 2016

Journal of the Society of Naval Architects of Korea

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which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.In this study, hydrodynamic and mooring analysis for LNG FSRU moored by an internal turret with 9 mooring lines are numerically performed using commercial softwares, Hydrostar and Ariane. Met-ocean combinations for screening method are taken from wave governed condition(BV Rule Note NR 493) with relative heading between wave and wind between -45° and +45° and relative heading between wind and current between -30° and +30°. Extreme mooring analysis and sensitivity analysis are performed for intact and damaged (=one line missing) conditions and the parameters for sensitivity analysis are wave peak period, peak enhancement factor and line pretension. In the viewpoint of the design tension in mooring line, chain diameter is designed to satisfy safety factor for each conditions. As the chain diameter is increased from 152mm to 171mm, the designtension is reduced while the minimum breaking load is increased.

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Design of Mooring Lines of a Floating Offshore Wind Turbine in South Offshore Area of Jeju

Cited by 3 publications

References 11 publications

Fatigue damage analysis for a floating offshore wind turbine mooring line using the artificial neural network approach

Fatigue damage analysis for a floating offshore wind turbine mooring line using the artificial neural network approach

A Study on Effect of Aerodynamic Loads on Mooring Line Responses of a Floating Offshore Wind Turbine

Extreme Mooring Analysis of Turret Moored LNG-FSRU

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