Glib IvanovYongyan WuDongHui ChenZhao-Yu LaiJui-Chen ChenNikolai GladkovKai-Tung (KT) Ma2024-12-112024-12-112024-06-099780791887851https://www.scopus.com/record/display.uri?eid=2-s2.0-85210010090&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/723670The scarcity of suitable shallow waters for fixed-bottom offshore wind turbines has prompted developers to explore deeper waters, albeit with caution due to the significant capital expenditure (CAPEX) associated with Floating Offshore Wind Turbines (FOWTs). A major cost component in FOWTs is the mooring system, a concern exacerbated in regions with the presence of typhoons, necessitating a more robust and therefore expensive 3x3 mooring solution compared to 3x1 in areas such as the North Sea. This study tried to propose a 3x2 mooring arrangement tailored for FOWTs in the typhoon region, offering a potential cost reduction of up to one-third compared to the original 3x3 configuration. To achieve cost savings, an in-depth analysis of spreading angles from 10° to the widest angle of 126° is performed using the pre-tension-diameter vs offset-tension 3D response surfaces technique. The research reveals that, theoretically, a 60° mooring angle minimizes floater offset with the least tension. However, the discrepancy in safety factors between intact and damaged conditions makes grouped mooring a more cost-effective choice. Utilizing the American Bureau of Shipping (ABS) safety factor, a 10° spread angle mooring system's chain cost emerges as roughly one-tenth cheaper than alternative configurations. Additionally, the study explores an innovative V-Share mooring [1], wherein a single pile anchor connects to two different columns via two mooring lines. Depending on the anchoring conditions, it can be the most cost-effective. In conclusion, a 3x2 mooring pattern for a 15MW semi-submersible FOWT in typhoon regions might be theoretically achieved on paper. However, it may not be practically achieved, if the size limit of the manufactured chain is considered.falseCost OptimisationFloating Offshore Wind TurbinesFloating WindFOWTMinimum Break LoadMooring ChainMooring SystemV-Share Mooring[SDGs]SDG7conference paper10.1115/OMAE2024-1228742-s2.0-85210010090