Two developments relevant to the stability analysis of semi-submersibles are presented. The first concerns the derivation of the 'conventional' hydrostatic properties of a vessel by modelling the hull geometry using discrete (or finite) elements. This method has a number of advantages, notably the modelling of arbitrary geometries, including internal bulkheads and partitions for analysis of a damaged condition, the ease of incorporation of external forces such as mooring lines, thrusters etc., and a fully coupled solution procedure in six degrees of freedom. The second development described in the paper is concerned with the assessment of stability of semi-submersibles as a dynamic problem, i.e. in waves. It is demonstrated using an idealised model that dynamic excitation can cause a reduction in the stability of a semi-submersible over that which would be obtained using a purely static approach. The use of discrete element modelling in order to assess dynamical stability is also discussed.
The development of stability analysis of semi-submersibles
Die Entwicklung einer Stabilitaetsanalyse fuer Halbtaucher
1983
12 Seiten, 9 Bilder, 10 Quellen
Conference paper
English
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