Design and Numerical Investigation on Octagonal Barge-Type FOWT with Counterweight Suspension System

Yung-Chun Sun and Ray-Yeng Yang ()
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Yung-Chun Sun: Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 70101, Taiwan
Ray-Yeng Yang: Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 70101, Taiwan

Energies, 2025, vol. 18, issue 2, 1-34

Abstract: This study aims at enhancing platform design and passive control technology, reducing maintenance costs, and increasing stability and efficiency. The selected site for this study is offshore water in Hsinchu, Taiwan. Owing to shallow water conditions at the selected site, an octagonal barge-type platform was chosen for investigation of its suitability in this study. A counterweight suspension system was used to improve stability and avoid pitch resonance. Meanwhile, an octagonal barge platform carrying the NREL-5MW offshore wind turbine was designed. It uses SolidWorks for modeling, Ansys AQWA for hydrodynamic calculations, and Orcina OrcaFlex for wind/wave/current coupling dynamic analysis. Key research results include optimizing the counterweight suspension system and ensuring compliance with Det Norske Veritas (DNV) regulations, covering Ultimate Limit States (ULSs), Accidental Limit States (ALS)s, Serviceability Limit States (SLSs), and Fatigue Limit States (FLSs). Thus, the major inspections include platform motions, mooring line tension, and suspension system tension during turbine operation and parking. Comparisons are made with and without the counterweight suspension system.

Keywords: floating offshore wind; floater design; octagonal barge-type platform; counterweight suspension system; passive control; numerical simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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