非線形性を考慮した波浪中の船体縦運動および縦強度 : 第2報

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Assuming ship's hull as a rigid body, in the previous paper, the authors calculated the motion and longitudinal strength of a ship in waves taking account of the effects of nonlinearities due to bottom emergence, bottom impact and so on, and it showed good agreements with experiments. However, the vibratory structural responses is more important in case of slamming. In this paper, we regard the_ ship hull as an elastic beam and calculate the longitudinal bending moment based on the deformations of the ship hull, which is treated as a rigid body in the previous paper. The present procedure, in addition, includes the effects of the Smith Correction that was ignored previously. Conclusions obtained are as follows : (1) In the rigid body responses, the peak value of bending moment of slamming is influenced by the Smith Correction only slightly. (2) As for the whipping vibration, the amplitudes of bending moment is of the order of the peak value of that obtained by the rigid body assumption, and it oscillates about that of rigid body responses. (3) A ship in the ballast condition of the Segregated Ballast Tank standard proposed by IMCO may suffer from slamming damages in rough sea, for instance Hw/L > 1/25, and therefore heavier ballast should be required in such cases.
社団法人日本船舶海洋工学会の論文