Dynamic Analysis Of The Mooring System For A Floating Offshore Wind Turbine Spar Platform

2015 
Based on the 5 MV wind turbine of a certain renewable energy institute in America, the model of a floating offshore wind turbine spar platform mooring system has been established by Orcaflex. By calculating the load on the wind turbine, the hydrodynamic analysis of the wind turbine mooring system was researched and the mooring tension of the mooring system was analyzed in different load conditions. With the change of different fairlead position and different layouts of the fairleads, the optimization design of the mooring system has been given. A satisfying mooring system for the offshore wind turbines is very complex. The almost constant wind, current and wave drift force would cause the natural position of the system to move and produce the impact load at the equilibrium position which would make the mooring chain appear tension-relaxation alternating motion. It would cause the mutation of the cable effective tension. At present, the floating offshore wind turbine spar is only applied to the shallow water depth of 30m.(1-2) In this paper, based on the time domain coupled dynamic analysis method, the applicable water depth has reached up to 70m.
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