Human motion exposure and workability assessment for floating offshore wind platforms

• Motion sickness and workability analysis for floating offshore wind turbine operation. • Coupled hydrodynamic, wind-thrust, mooring, human-factor modelling. • Annual analysis due to wind and wave climate of Orkney area for Volturn semi-sub. • Effective thresholds for platform operation visualized through bubble charts. • Workability is good 87 % of the year but below comfort threshold in severe sea states. This paper addresses the workability and human comfort challenges associated with Floating Offshore Wind Turbines (FOWTs), using the Volturn semi-submersible platform as a case study. A comprehensive and efficient workability evaluation framework is established, integrating hydrodynamic and human motion exposure and comfort assessment. Met-ocean data collected from the Orkney Islands over one year are used for simulation. Results quantify platform accelerations against established human comfort thresholds, showing that workability remains high ( W I > 0.9 ) for approximately 87 % of the year, but decreases sharply in severe sea states ( H s > 7 m, T p > 12 s, W s > 19 m/s) where W I < 0.8 . This work provides fundamental insights for future research on operational optimisation and human-factor integration in FOWT systems.