非周期的造波問題の周波数領域での取扱い (第3報) : 二次元物体の過渡応答

概要

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In the previous papers a calculation method for the memory effect function, the hydrodynamic response for an impulse motion, was shown. In this paper the transient responses of a two-dimensional body are discussed. In the first part of the paper, the transient responses of a stepwisely or sinusoidaly heaving circular cylinder on still water are evaluated using the memory effect function. The results are compared with the asymptotic value and the steady state response respectively. In the second part of the paper, the transient responses of a linearly non-linearly moored circular cylinder in the regular waves are calculated. The comparisons between the results obtained from the equation of motion in the time domain and the ones from the equation of motion in the Frequency domain are made. Fairly large differences between the two results are recognized when the motion due to the natural frequency of the mooring system appears in an early stage depending on the conditions of the waves and the restoring forces.
社団法人日本船舶海洋工学会の論文
1982-12-30