Stress Estimation Based on Stochastic Method for Strength Evaluation of Floating Wind Turbines
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Structural integrity assessment of floating wind turbine (FOWT) systems is performed based on fully coupled load analysis in time domain and structural analysis that consider the complex interactions among wind, wave, and currents. However, there is a limit to repeating load and structural analyses several times for numerous DLCs required in actual projects. In this study, to determine the reasonable analysis time for structural integrity evaluation, actual time series for 1 hour and 3 hours were calculated based on FOWT load and structural analysis. Next, each time series was stochastically fitted to Weibull distribution function. The most probable maximum (MPM) von-Mises stresses were estimated according to the probability level corresponding to the design life of the platform on the fitted curves. The maximum von-Mises stress from 1 h and 3 h showed a large deviation depending on the analysis time, while the MPM von-Mises stress estimated by applying the same probability level did not show a large deviation, and the variability according to random execution also showed a similar trend. Through further research, it is expected that the optimal analysis time for estimating MPM stress can be determined, allowing for efficient structural integrity assessment for FOWT.
Abstract
Structural integrity assessment of floating wind turbine (FOWT) systems is performed based on fully coupled load analysis in time domain and structural analysis that consider the complex interactions among wind, wave, and currents. However, there is a limit to repeating load and structural analyses several times for numerous DLCs required in actual projects. In this study, to determine the reasonable analysis time for structural integrity evaluation, actual time series for 1 hour and 3 hours were calculated based on FOWT load and structural analysis. Next, each time series was stochastically fitted to Weibull distribution function. The most probable maximum (MPM) von-Mises stresses were estimated according to the probability level corresponding to the design life of the platform on the fitted curves. The maximum von-Mises stress from 1 h and 3 h showed a large deviation depending on the analysis time, while the MPM von-Mises stress estimated by applying the same probability level did not show a large deviation, and the variability according to random execution also showed a similar trend. Through further research, it is expected that the optimal analysis time for estimating MPM stress can be determined, allowing for efficient structural integrity assessment for FOWT.
참고문헌 (12)
- Dong, Y., "Simplified strength assessment for preliminary structural design of floating offshore wind turbine semi-submersible flatform", Journal of Marine Science and Engineering, 12(2), pp.259~ (2024)[DOI]
- Faraggiana, E., "A review of numerical modelling and optimisation of the floating support structure for offshore wind turbines", Journal of Ocean Engineering and Marine Energy, 8, pp.433~456 (2022)[DOI]
- "Annex F.2:Use of IFORM to determine 50-yr significant wave height conditional on mean wind speed (ed. 1, 131–132). Wind energy generation systems - Part 3–1: Design requirements for fixed offshore wind turbines (IEC 61400-3-1:2019)" (2019)[URL]
- Lee, H., "Time-domain response-based structural analysis on a floating Offshore wind turbine", Journal of Marine Science and Application, 22(1), pp.75~83 (2023)[DOI]
- Li, W., "Global design methodology for semi-submersible hulls of floating wind turbines", Renewable Energy, 225, pp.120291~ (2024)[DOI]
- Park, S., "Structural design of the substructure of a 10 MW floating offshore wind turbine system using dominant load parameters", Journal of Marine Science and Engineering, 11(5), pp.1048~ (2023)[DOI]
- 2020 Cost of Wind Energy Review, "Stehly, T.", National Renewable Energy Laboratory, 31~ (2021)
- Wang, L., "Reliability of offshore wind turbine support structures : A state-of-the-art review", Renewable and Sustainable Energy Reviews, 161, pp.112250~ (2022)[DOI]
- Wang, S., "Methodology of load effect analysis and ultimate limit state design of semi-submersible hulls of floating wind turbines : With a focus on floater column design", Marine Structures, 93, pp.103526~ (2024)[DOI]
- Wang, S., "Analysis of extreme internal load effects in columns in a semi-submersible support structure for large floating wind turbines", Ocean Engineering, 291, pp.116372~ (2024)
- Wang, S., "Methodology for global structural load effect analysis of the semi-submersible hull of floating wind turbines under still water, wind, and wave loads", Marine Structures, 91, pp.103463~ (2023)[DOI]
- Wang, S., "Design, local structural stress, and global dynamic response analysis of a steel semi-submersible hull for a 10-MW floating wind turbine", Engineering Structures, 291, pp.116474~ (2023)[DOI]