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, and 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. A simple procedure has been developed in the form of a computer program, NICDAF, (Non-linear Integrated Coupled Dynamic Analysis of Floaters). The coupling effects of the risers and mooring lines are included based on their quasistatic configurations at each time step instead of their actual dynamic equilibrium configurations. The case study results show that full coupling of dynamic equilibrium is not important for accurate platform motion, but it is important for the riser or mooring line motions. Details of the development of the procedure and the case study analysis results from ABAQUS and NICDAF are presented.
Coupled dynamic analysis of platforms, risers, and moorings
2000
8 Seiten, 13 Quellen
Aufsatz (Konferenz)
Englisch
FATIGUE OF SLENDER OFFSHORE STRUCTURES: MOORINGS, RISERS, AND UMBILICALS
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