Load Evaluation for Tower Design of Large Floating Offshore Wind Turbine System According to Wave Conditions

This study entailed a load evaluation for the tower design of large floating offshore wind turbine system in accordance with wave conditions. The target model includes IEA 15 MW reference and semi-submersible VolturnUS-S platform from University Maine. OpenFAST, which is an aero-hydro-servo-elastic fully coupled analysis tool, was used analysis. DLC1.2 1.6 were as cases, environmental conditions suitable cases cited report. Load performed according to time series FFT results. findings are follows: first, correlation analysis, tower-top deflection had highest correlation, this further affects nacelle acceleration. Second, tower-base pitch moment increased significant height. However, peak period until it matched frequency decreased thereafter. Third, comparison between normal severe sea state revealed that moments two almost similar, despite wherein spectral energy differs by factor 3.5. Fourth, shape changed while adjusting diameter tower, reviewed using redesigned tower. Even if mass same, reduces only moment.