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Outline
Deepwater mooring systems are critical infrastructure for semi-submersible platforms, directly influencing their operational safety and stable operation. Traditional steel-chain mooring systems are increasingly inadequate for meeting the urgent demands of deepwater and ultra-deepwater marine resource development, primarily due to their inherent limitations such as high self-weight and susceptibility to corrosion. Carbon fiber reinforced polymer (CFRP) composites, which possess exceptional properties including light weight, high strength, high-temperature resistance, corrosion resistance, fatigue resistance and durability, provide a new solution for the configuration design and engineering application of mooring systems for deepwater semi-submersible platforms. Taking a deepwater semi-submersible platform in the South China Sea as the research object, this study proposes a novel three-segment mooring configuration consisting of steel chain–CFRP cable–steel chain, and further constructs two three-segment mooring systems, namely steel chain–CFRP cable–steel chain and steel chain–polyester cable–steel chain. A coupled hydrodynamic analysis model of the large floating platform–mooring system was established, and the dynamic response characteristics of the two mooring configurations including mooring tension, fatigue damage and platform motions were comparatively investigated through numerical simulations. The results indicate that compared with the polyester cable mooring configuration, the CFRP cable mooring configuration exhibits higher overall stiffness and lower natural periods in surge, sway, roll, pitch, and yaw. Under extreme wave conditions, it shows better performance in restraining platform motions, thereby leading to higher platform stability and operational reliability. Notably, the fatigue damage of the CFRP mooring cable is much lower than that of the polyester cable; however, the use of CFRP cable increases the fatigue damage of the steel chains at both ends, especially that of the bottom steel chain. These findings reveal the dynamic response characteristics of a deepwater semi-submersible platform under a CFRP mooring system, preliminarily verify the feasibility and superior performance of CFRP cables in deepwater semi-submersible platform mooring systems, and provide important data support and reference for innovative mooring scheme design and engineering applications.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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