甲板昇降式海洋掘削台の着底作業時の動揺

概要

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When an elevating-deck ocean structure (so-called jack-up rig) is operated to jack up or to jack down in waves, its long legs collide with the sea bottom due to the motion of the rig. If the collision is severe, this shock load will affect very seriously leg's construction and jacking mechanism. Therefore it is important to predict the motion of the rig. In order to predict the behavior of it model tests on a rectangular rig and triangular rig were carried out in regular waves. Futhermore their results were compared with the values calculated by two theoretical methods where hydrodynamic forces acting on the hull were calculated by the three-dimensional source method or the strip method. The strip method was modified to predict more precisely the motion of the rig in oblique waves. On the other hand, hydrodynamic forces acting on the legs were calculated by using the inertia coefficient C_M, the added mass coefficient C_A and the drag coefficient C_<DF> obtained by the experiment. Consequently, it is certified that the calculated results by two methods coincide with the experimental results.
社団法人日本船舶海洋工学会の論文
1982-03-03