半潜水型石油堀削船の動的復原性評価プログラムについて

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As a part of works in the Special Project on the stability of semisubmersible drilling rigs, which were conducted at the Ship Research Institute of Japan, a computer code for the calculation of behaviours of semisubmersible drilling rigs under dynamic loads was developed. Dynamic behaviours of semisubmersible drilling rigs in heavy environmental conditions have attracted much attention with the focus on the slow drift oscillations and resultant mooring forces. Although it is undoubtful that the behaviours in heavy environmental conditions are vital problems for the safety of semisubmersible drilling rigs, transient motions due to mishaps such as breakings of mooring/towing lines, floodings, unexpected cargo movements, collisions etc. could experience such large displacements/inclinations that might endanger the safety of the semisubmersibles. On the contrary to the behaviours in heavy sea conditions, however, such transient behaviours have attracted little attention so far. Therefore, using the developed computer code, the authors have carried out simulations of such transient behaviours of semisubmersibles as well as behaviours in heavy environmental conditons and examined the accuracy of the calculated results through the comparisons with available experimental data. The objective of this paper is to describe the specifications of the developed computer code and to present the simulation results obtained by the code, which might benefit the future developments of similar computer codes.
独立行政法人海上技術安全研究所の論文
1989-07-31

半潜水型石油堀削船の動的復原性評価プログラムについて

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