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Recently I have met a problem to identify the natural frequency of the tower of the NREL 5MW OC4 semisubmersible wind turbine.įrom the report and FAST V8, we can know the details as below: Therefore, I am looking forward to your reply, The choice of these parameters has a great influence on the response of the OC4 wind turbine. while in FAST v8, i cannot find in the file called ''NRELOffshrBsline5MW_OC4DeepCwindSemi_HydroDyn''. For example, in reference, i can know the Center of buoyancy below SWL is 13.15m. However, some parameters in the FAST model are difficult to determine which needs to be determined by the Reference. At present, i have built a OC4 Semi model by myself,which needs to be validated with the FAST model output. Therefore,i am not sure which number is correct and which model to trust. While in the Table 3-3 (Floating platform structural properties) in the reference , 8.6588 PtfmCMzt - Vertical distance from the ground level or MSL to the platform CM (meters)Ģ.56193E+09 PtfmRIner - Platform inertia for roll tilt rotation about the platform CM (kg m^2)Ģ.56193E+09 PtfmPIner - Platform inertia for pitch tilt rotation about the platform CM (kg m^2)Ĥ.24265E+09 PtfmYIner - Platform inertia for yaw rotation about the platform CM (kg m^2) In the file called ''NRELOffshrBsline5MW_OC4DeepCwindSemi_ElastoDyn'',

"Definition of the Semisubmersible Floating System for Phase II of OC4." (2014).Īnd I am also looking into the file in the FAST v8 and OpenFAST file about 5MW-OC4-DeepCwind SemiSubmersible wind turbine, which in FAST v8 it refered to the Test 25. Recently I have studied the reference below about the NREL 5MW-OC4-DeepCwind SemiSubmersible wind turbine.