Design Improvement of a Semi-submersible Floating Offshore Wind Turbines through Frequency-domain Load Analyses
The purpose of this study is to analyze the differences in motion response performances according to the design variables of semi-submersible substructures supporting floating offshore wind turbines (FOWTs) and propose an improved design. The specifications of the IEA 15 MW reference semi-submersibl...
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| Format: | Article |
| Language: | English |
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The Korean Society of Ocean Engineers
2025-04-01
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| Series: | 한국해양공학회지 |
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| Online Access: | https://doi.org/10.26748/KSOE.2025.003 |
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| author | Soo Bin Lee Joonmo Choung |
| author_facet | Soo Bin Lee Joonmo Choung |
| author_sort | Soo Bin Lee |
| collection | DOAJ |
| description | The purpose of this study is to analyze the differences in motion response performances according to the design variables of semi-submersible substructures supporting floating offshore wind turbines (FOWTs) and propose an improved design. The specifications of the IEA 15 MW reference semi-submersible FOWT were used for this study. Draft, circumradius, main column diameter, and pontoon breadth were determined as dominant design variables that significantly affect the motion response of the substructure. A Python code was developed to automatically generate hundreds of analysis models. Motion responses were derived through frequency domain load analyses. The responses were heave natural period, pitch angle, and acceleration at the rotor nacelle assembly (RNA) with 20 year-return period. Deeper drafts resulted in less development of RNA acceleration and pitch angle. The main column diameter had the greatest impact on the heave natural period. Main column diameter, pontoon breadth, and circumradius controlled the pitch angle response amplitude operator (RAO) and RNA acceleration RAO. The RNA acceleration did not show consistent trends with design variables due to resonance. With assumed weighting factors for each variable, the reference FOWT substructure was improved. The results are expected to make a significant contribution to improving the motion performance of FOWTs. |
| format | Article |
| id | doaj-art-90e8918dd64f4cb1a8e07a42cb58ed9b |
| institution | Kabale University |
| issn | 1225-0767 2287-6715 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | The Korean Society of Ocean Engineers |
| record_format | Article |
| series | 한국해양공학회지 |
| spelling | doaj-art-90e8918dd64f4cb1a8e07a42cb58ed9b2025-08-20T03:53:39ZengThe Korean Society of Ocean Engineers한국해양공학회지1225-07672287-67152025-04-0139218920410.26748/KSOE.2025.003Design Improvement of a Semi-submersible Floating Offshore Wind Turbines through Frequency-domain Load AnalysesSoo Bin Lee0https://orcid.org/0009-0000-9754-7915Joonmo Choung1https://orcid.org/0000-0003-1407-9031Inha UniversityInha UniversityThe purpose of this study is to analyze the differences in motion response performances according to the design variables of semi-submersible substructures supporting floating offshore wind turbines (FOWTs) and propose an improved design. The specifications of the IEA 15 MW reference semi-submersible FOWT were used for this study. Draft, circumradius, main column diameter, and pontoon breadth were determined as dominant design variables that significantly affect the motion response of the substructure. A Python code was developed to automatically generate hundreds of analysis models. Motion responses were derived through frequency domain load analyses. The responses were heave natural period, pitch angle, and acceleration at the rotor nacelle assembly (RNA) with 20 year-return period. Deeper drafts resulted in less development of RNA acceleration and pitch angle. The main column diameter had the greatest impact on the heave natural period. Main column diameter, pontoon breadth, and circumradius controlled the pitch angle response amplitude operator (RAO) and RNA acceleration RAO. The RNA acceleration did not show consistent trends with design variables due to resonance. With assumed weighting factors for each variable, the reference FOWT substructure was improved. The results are expected to make a significant contribution to improving the motion performance of FOWTs.https://doi.org/10.26748/KSOE.2025.003floating offshore wind turbinedominant design variablefrequency response analysisheave natural periodpitch anglerna acceleration |
| spellingShingle | Soo Bin Lee Joonmo Choung Design Improvement of a Semi-submersible Floating Offshore Wind Turbines through Frequency-domain Load Analyses 한국해양공학회지 floating offshore wind turbine dominant design variable frequency response analysis heave natural period pitch angle rna acceleration |
| title | Design Improvement of a Semi-submersible Floating Offshore Wind Turbines through Frequency-domain Load Analyses |
| title_full | Design Improvement of a Semi-submersible Floating Offshore Wind Turbines through Frequency-domain Load Analyses |
| title_fullStr | Design Improvement of a Semi-submersible Floating Offshore Wind Turbines through Frequency-domain Load Analyses |
| title_full_unstemmed | Design Improvement of a Semi-submersible Floating Offshore Wind Turbines through Frequency-domain Load Analyses |
| title_short | Design Improvement of a Semi-submersible Floating Offshore Wind Turbines through Frequency-domain Load Analyses |
| title_sort | design improvement of a semi submersible floating offshore wind turbines through frequency domain load analyses |
| topic | floating offshore wind turbine dominant design variable frequency response analysis heave natural period pitch angle rna acceleration |
| url | https://doi.org/10.26748/KSOE.2025.003 |
| work_keys_str_mv | AT soobinlee designimprovementofasemisubmersiblefloatingoffshorewindturbinesthroughfrequencydomainloadanalyses AT joonmochoung designimprovementofasemisubmersiblefloatingoffshorewindturbinesthroughfrequencydomainloadanalyses |