Motion analysis of platforms operating in deep waters is quite a challenge. In order to obtain a realistic motion, the analysis must be performed as an integrated system of risers, mooring lines, nad the platform. A fully coupled analysis of such a system is very time consuming and modeling simplifications, both structural and hydrodynamic, are often applied thereby introducing uncertainty in the accuracy of the results. For accurate vessel motions such fully coupled analysis may not really be warranted. It is rather beneficial to use a simplified procedure to include the effects of the risers and mooring lines and, if possible, be more accurate in the hydrodynamic modeling.
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