Transient survival analysis of a moored floating offshore platform: wind biased
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In this paper, we investigate the very large amplitude roll motions of the capsized MODU Ocean Ranger. We utilize the dynamical systems approach to analyze all possible motions for fixed vessel and environmental conditions. We include the effects of wind bias and an equivalent mooring system. As expected, we find the effects of wind bias to dramatically effect the system's safe basin, a measure of the vessel's resistance to capsizing. Somewhat surprizingly, we find the mooring system to have a limited effect on the roll due to it's small size relative to the hydrostatic roll restoring moment.