Speaker
Description
In order to explore, design, install and operate new wind farms, it is necessary to ensure the durability of the unit wind platform. In particular, they must have good hydrodynamic and aerodynamic performances as well as structural performance.
However, in contrast to fixed wind platforms, floating wind platforms are very technically challenging and present technical bottlenecks in the design process, such as the so-called integrated load analyses (ILAs).
ILAs performed by OpenFAST, Bladed, OrcaFlex, etc. include structural dynamics from the perspective of the superstructure, but cannot include structural dynamics of the substructure because the floater is considered as a single point mass, i.e. the dynamic stresses and strains of the substructure cannot be obtained by performing ILAs. Due to this problem, the ULS and FLS of the floater cannot be evaluated even after the ILAs.
Recently, to solve this problem, a method has been proposed to obtain the stresses of the floating body by imbedding a hydrodynamic subroutine in a commercial finite element analysis (FEA) code. Also, a technique for evaluating ultimate limit state (ULS) based on DSA has been proposed. DSA is recognized as an efficient method that can significantly reduce ILA period. However, a further research needs to be conducted to effectively formalize the hydrodynamic pressure patterns acting on the wet side shell. Several studies on the effective use of ILAs are noteworthy. Recently, a method for performing quasi-dynamic analysis and obtaining time-domain stress history by utilizing ILAs results as loading factors has been proposed. Recently, a study has been presented on how to derive stresses due to hydrodynamic forces by dividing total wave pressure into wave excitation and radiation terms.
References
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| Keywords | ILA, FEA, DSA, ULS, FLS |
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