Semi-Submersible Catamaran Hullの浅吃水時における動揺

概要

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This paper is the second report on the motion of a Semi-Submersible Catamaran Hull (S.S.C.H.) in regular waves and is especially concerned with the motion of S.S.C.H. at shallow draft in head seas and beam seas. We calculate the hydrodynamic coefficients (abded mass, damping coefficient etc.) by Ohkusu's method, which deals with the calculation of hydrodynamic force and moment working upon multiple cylinders with an arbitrary cross section. Then the equations of the motions of S.S.C.H. in head seas or beam seas can be formulated with the aid of the strip method. The solutions of these equations are shown to be in good agreement with the experimental results except for a part of head seas. The motions of S.S.C.H. theoretically show some unique phenomena such as sharp resonance peak in short wave periods, which are caused by coupled resonace of rolling and interactions between hydrodynamic forces working upon the caissons. Usually there are many natural periods in free oscillation of S.S.C.H. theoretically. In the model experiment, howevere, there appears the only one natural period which has the smallest damping force.
社団法人日本船舶海洋工学会の論文
1971-07-31