Research On Towing Motion Response And Risk Analysis Of Fully Submerged Floating Offshore Wind Turbine

In this paper,a fully submerged floating wind turbine with the depth of 50-200 m was used as the research object.Physical model test and numerical simulation were used to study the effects of draft depth,towing speed and wave conditions on the towing motion characteristics of the fully submerged floating wind turbine while considering compartment damaged,cable fractured and different wave angles.At the same time,the risk accidents in the towing process of the fully submerged floating wind turbine were evaluated after risk identification.The details are as follows:In allusion to explore the eigenperiods’ law of the fully submersible floating wind turbine at different draught depths,model test and numerical simulation were carried out.The numerical simulation results were compared with the experimental monitoring data after transforming with similarity principle,and it was concluded that the error of natural periods such as pitch and heave were smaller,and the coincidence degree was better.In order to study the effects of draught depth,towing speed and wave conditions on the motion characteristics of the fully submersible floating wind turbine during the integrated towing,the towing system of the tugboat-the cable-the fully submersible floating wind turbine based on the multibody dynamics’ method was carried out.By comparing the results of the test and numerical simulation,it was concluded that the monitoring data was in good agreement with the numerical simulation results,which further verified the correctness of the numerical simulation.Considering the effects of towing speed,wave conditions and wave angles,the motion characteristics of the fully submersible floating wind turbine under towline’s failure and water inlet after compartment damaged were studied.It can provide technical guidance for integrated towing of the fully submersible floating wind turbine.The results showed that the pitch and roll were always within ±5°,and the absolute value of heave acceleration was less than 0.2g.In order to analyze the accident risk during the towing of the fully submersible floating wind turbine,risk identification and fuzzy comprehensive evaluation were used to analyze the accident impact degree,and corresponding control measures were proposed according to the results of risk analysis.