Effect on mooring line separation angles including one-line failure for 15 MW floating offshore wind turbine system
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초록
This study investigated the dynamic behavior of a 15 MW floating offshore wind turbine system under mooring line failure conditions with varying mooring line separation angles (10°, 20°, and 30°). A numerical model was developed using commercial software OrcaFlex, and both time- and frequency-domain simulations were performed under extreme environmental conditions. The analysis focused on the failure of Mooring Line 2 in a six-line catenary configuration. The time-domain results revealed that the moor-ing line layout had a minimal effect under intact conditions; however, after the one-line failure, the 30° case exhibited the largest increases in surge, sway, roll, and yaw motions owing to the greater asymmetry in the restoring forces. In addition, the mooring line tensions were redistributed, with significant increases in Mooring Lines 1, 3, and 4. The bending moment of the power cable at the touchdown point peaked in the 30° configuration. The frequency-domain analysis showed dominant ultralow-frequency responses, particularly in the 10° case. These findings highlight the critical role of the mooring layout in the structural response and provide insights into the design of mooring systems and potential mitigation strategies for failure scenarios.
Abstract
This study investigated the dynamic behavior of a 15 MW floating offshore wind turbine system under mooring line failure conditions with varying mooring line separation angles (10°, 20°, and 30°). A numerical model was developed using commercial software OrcaFlex, and both time- and frequency-domain simulations were performed under extreme environmental conditions. The analysis focused on the failure of Mooring Line 2 in a six-line catenary configuration. The time-domain results revealed that the moor-ing line layout had a minimal effect under intact conditions; however, after the one-line failure, the 30° case exhibited the largest increases in surge, sway, roll, and yaw motions owing to the greater asymmetry in the restoring forces. In addition, the mooring line tensions were redistributed, with significant increases in Mooring Lines 1, 3, and 4. The bending moment of the power cable at the touchdown point peaked in the 30° configuration. The frequency-domain analysis showed dominant ultralow-frequency responses, particularly in the 10° case. These findings highlight the critical role of the mooring layout in the structural response and provide insights into the design of mooring systems and potential mitigation strategies for failure scenarios.