OTL worked on the development of 17.5WM offshore wind turbine with Semi-Submersible Foundation for CNOOC Research Institute Ltd. OTL’s scope of work included optimizing the Semi-Submersible configurations, design of the critical connection structure between the wind turbine tower and the Semi-Submersible main column, structural strength, and fatigue analysis, covering wind and wave loadings. The analysis and design employ detailed FE method for stress and buckling, and time domain rain-flow counting method for fatigue damage calculation.

Client: CNOOC Research Institute Ltd.

Date of Started:04/2024

Water Depth: 170 m

Wind Turbine: 17.5MW

SOW: OTL performed following designs and analyses, and submitted associate reports

· Configuration optimization of Wind Turbine support structures (three-columned Semi-Submersible sub-structure)

· Structural design and analyses

o Structure design of the critical connection between the wind turbine tower and the floating Semi-Submersible foundation.

o In-place strength analysis under critical wind, wave, and current loads

o Supporting structure buckling check

o In-place time history local fatigue assessment with rain-flow counting method