Abstract
The air-gap response of semi-submersible platforms is critical for ensuring operational sustainability. This study analysed platform-based in-situ measurements from the HYSY 981 semi-submersible platform during extreme sea conditions caused by super typhoon Doksuri. Our primary aim was to investigate how motions induced by the dynamic positioning system, particularly rotations, affected the platform's air-gap response. Results demonstrated that under extreme sea states, thruster-induced rotation significantly influenced air-gap responses. To estimate extreme air-gap response values, we employed two statistical models: the Weibull tail fitting (WTF) method and the Naess–Gaidai tail fitting (NGTF) method. Our analysis revealed that the NGTF method provided more robust and stable estimates of the most probable maximum (MPM) values compared to the three-parameter WTF method, especially when applied to in-situ measurement data. This research contributes to a better understanding of semi-submersible platform behavior during extreme weather events, which is essential for enhancing operational sustainability and structural integrity in offshore operations.
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