Optimized design of deepwater catenary mooring system in equivalent truncated water depth

Used in deepwater catenary mooring systems, the multi-component mooring lines are usually made up of three wire ropes and chains of different buoyancy unit weight, stiffness and length. Considering the gravity, tension, current force and mooring line extension, the piecewise extrapolating method is employed to the static analysis of the multi-component mooring line and the golden section method is used to find out the top angle of the mooring line. An optimized designing program is developed based on genetic algorithm considering the similarity of static characters for hybrid model test. Taking the catenary mooring system used for some semi-submersible platform of 1 500 m water depths for example, the equivalent truncated mooring system used in 700 m water depths is designed, which can provide references for the following processes in hybrid model test.