Session: 09-02-07 Wind Energy: Fatigue Analysis

Submission Number: 182361

Comprehensive Fatigue Assessment of a FOWT Considering Structural Dynamics 

Structural integrity of the SnapWind, a FOWT substructure developed by Samsung Heavy Industries, is investigated with the consideration of structural dynamic response. The FOWT substructure is modeled by shell and beam finite-element model resolving details of local structure of the SnapWind. The structural model is dynamically condensed into a reduced-order model that retains rigid-body and normal modes, identified based on eigenfrequencies spanning the load and response spectral band of wind / wave environmental load and mechanical loads from wind turbine. The condensed model is implemented in a commercial Integrated Load Analysis (ILA) software and coupled with wind turbine, mooring lines and inter-array power cables. Hydrodynamic coefficients for rigid-body and normal modes are provided to ILA model to consider hydroelasticity.

 

ILA for Design Load Cases (DLCs) has been performed to obtain dynamic responses from the FOWT for the fatigue assessment of SnapWind. The dynamic responses from ILA are used to reconstruct structural responses of FOWT substructure, such as nodal displacement and elemental stress for the fatigue assessment covering the design life of the FOWT. As a comparative study, fatigue assessment has been performed for the same structure without considering the structural dynamics of substructure to demonstrate the importance of structural dynamics on fatigue damage.

Presenting Author: Jang Kim Front Energies

Presenting Author Biography: More than 30 years of experience in engineering projects of floating structures including Spar, TLP, Semi-submersible and FLNG. For the recent 5 year, work focused on Numerical Wave Basin development and application to offshore projects including floating offshore wind turbine.

Authors:

Chan-Hyun Park Ship and Offshore Research Institute, SAMSUNG HEAVY INDUSTRIES CO., LTD.
Hyun-Sung Kim Ship and Offshore Research Institute, SAMSUNG HEAVY INDUSTRIES CO., LTD.
Raehyoung Yuck Ship and Offshore Research Institute, SAMSUNG HEAVY INDUSTRIES CO., LTD.
Youjin Yim Front Energies
Hyungtae Lee Front Energies
Johyun Kyoung Front Energies
Jang Kim Front Energies
Laurent Mutricy Ekium
Dominique Rizzo Ekium