Session: Structural Modeling & Analysis II
Paper Number: 96497
96497 - Time-Domain Response-Based Structural Assessment of a Floating Offshore Wind Turbine – Part 1: Buckling and Ultimate Strength Assessment
For more economic power generation, the blade size of offshore floating wind turbine becomes bigger than floating substructure. Consequently, structural load from wind turbine to floating substructure under unsteady turbulent wind condition becomes more important for structural strength assessment. In conventional load-based structural strength assessment, the coupling effect between hull motion and turbine loading are ignored such that the strength assessment based on the conventional methods has high uncertainties. Therefore, class societies recommend time-domain coupled analysis of the floating offshore wind turbine and subsequent response-based structural analysis to assess the structural strength.
Present paper introduces an efficient time-domain structural analysis for buckling and ultimate strength assessment. For various design load cases, full-blown time-domain structural analyses are performed by mapping the aero-elastic, hydrodynamic, hydrostatic, inertial and mooring loading from the coupled global motion simulation of the turbine and substructures in transient turbulent wind and irregular wave environments to the finite-element structural model. An efficient pseudo-spectral stress synthesizer is introduced to accelerate time-domain structural analysis, to enable response-based determination of the extreme structural responses in the design cycle of the hull without jeopardizing floating offshore wind turbine design schedule. A floating offshore wind turbine platform designed for Korean offshore wind farm projects is applied. Based on the time domain analysis, buckling and ultimate strength assessments are performed following the Class Rule provided by Korean Register.
Presenting Author: Jang Kim Front Energies
Time-Domain Response-Based Structural Assessment of a Floating Offshore Wind Turbine – Part 1: Buckling and Ultimate Strength Assessment
Paper Type
Technical Paper Publication