非対称波上の船の横揺れ挙動に関する研究 : 数値計算による検討

概要

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Ships in rough seas probably encounter the asymmetric waves with heigh steepness. However, at present the information on the roll characteristics derived from the wave asymmetry is not shown yet. In this paper, the roll behavior of a ship on the asymmetric waves is studied by solving numerically a simplified equation of roll motion. The above asymmetric waves are described by using symmetric waves and a deformation function. The results are summerized as follows; (1) The maximum roll angle of the ship on the solitary and asymmetric waves increases in proportion to the numerical value of a deformation parameter AA, and the increasing ratio remarkably enlarge in the wave period more than the natural roll period of the ship. (2) The roll amplitude of the ship on regular waves is not clearly different between on the asymmetric waves and on the symmetric waves. But in case of the wave asymmetry to be noticeable, the irregular feature appears in roll motion. (3) The wave asymmetry seems to stimulate the occurrence of chaotic roll.
社団法人日本航海学会の論文
1995-09-25