Study on coupled dynamic analysis of Semi-Submersible's mooring system in South China Sea

The far-flung ocean has abundant resource and the exploitation area of ocean oil and gas is developing from offshore to deep-water and ultra-deep-water following the increase demand for oil and gas resource. Therefore, one of the floating structures for deep-water exploitation is Semi-submersible. The compute of mooring lines' coupled dynamic analysis by using the 3-D potential theory, API of wind and JONSWAP of wave. The result indicate that the skewness coefficient and standard deviation of the mooring lines are symmetric in the N direction, so the tension on the mooring lines are relatively small, and the amplitude of the semi-submersible platform with multi-point mooring is relatively small, too.