1. On the Ship Motion Reduction by Anti-Pitching Fins in Head Seas

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概要

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• This is a study on a heaving-free and/or pitching-free ship with pairs of fins, that is, a ship which is free from the heaving and/or pitching oscillation in head sea at a given wave-length. For this purpose, it is sufficient to cancel the wave-exciting force and/or moment by using pairs of fins to make a ship with fin wave-free for heave and/or pitch motion. Thus, there are two equations in complex variables for the heave and pitch-free. On the other hand, a pair of fins has three variables to be determined which are the area, the aspect-ratio and the location of fins to be attached. Two pairs of fins are sufficient to make a ship heave-free or pitch-free. Taking a container-cargo ship for an example, the calculations based on strip-theory are carried out for two cases. And it is confirmed by experiments that the theory agrees well with experimental results. Nextly, a series of calculations is carried out for ships which have the same displacement but have different water-plane area in order to obtain an optimum fins small fin-area.

• 社団法人日本船舶海洋工学会の論文

著者

• Yamauchi Shigeru

  Maritime Defense Agency

• Hayashida Masayuki

  Maritime Defense Agency

• BESSHO Masatoshi

  National Defense Academy

• KYOZUKA Yusaku

  Research Institute for Applied Mechanics, Kyushu University

• MIYAZAKI Michio

  Maritime Defense Agency

• Kyozuka Yusaku

  Research Institute For Applied Mechanics Kyushu University

関連論文

• 1. On the Ship Motion Reduction by Anti-Pitching Fins in Head Seas
• 7. On the Complete Reflection of Water Waves
• 7. On the Nonlinear Wave Forces Acting on Submerged Cylinders

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