FATIGUE ANALYSIS METHOD FOR TRIPOD SUPPORT STRUCUTRE OF OFFSHORE WIND TURBINE
To realize the anti-fatigue design of offshore wind turbine support structures,a whole-local modeling-based fatigue analysis method was proposed.A detailed finite element model was established for the local hot spot regions.On the basis of the IIW specification,high-precision hexahedral solid elements were utilized for discretization,whereas beam elements were used to discretize non-critical areas.The proposed method overcomes the deficiencies of previous studies employing stress influence matrix,such as ignoring the displacement of the entire structure and making it difficult to apply the boundary conditions.Using IEC 61400 standards,the dynamic behavior and loads of the entire turbine were calculated and a fatigue analysis of the tripod support structure of an offshore wind turbine was performed.The cumulative damage values caused by various load conditions,wave height and water depth are compared and analyzed.The results demonstrate the viability and superiority of the proposed whole-local modeling method for fatigue analysis of offshore wind turbine tripod support structures.
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