左右揺れの波強制力を受けない形状について

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タイトル別名
  • On Wave-Free Forms in Swaying Oscillation
  • サユウユレ ノ ワ キョウセイリョク オ ウケナイ ケイジョウ ニ ツイテ

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This paper deals with the wave-free forms of a two-dimensional body in swaying oscillation. The wave-free body generates no radiating waves when oscillating horizontally on the free surface of a fluid at a wave-free frequency. By Haskind relations, the body experiences no sway exciting force in incident waves of the frequency.<BR>A method of the tracing of stream lines of the wave-free potentials which satisfy the conditions of the free surface and no radiating waves at infinity is used to investigate the features of the wave-free forms. The numerical approach gives two kinds of wave-free forms. One is a floating body, the sides of which are not vertical and inclined inwardly beneath the free water surface, and another is a submerged body. Numerical calculations of hydrodynamic forces are carried out for the floating bodies derived from the stream line tracing. Hydrodynamic characteristics of the bodies are discussed.<BR>Measurements of wave exciting forces are performed on the models of floating bodies and a submerged body with the various amplitudes of incident waves. The results reveal that the effect of wave height on sway exciting forces is significant. A tendency is observed that the measured exciting forces for smaller wave height are closer to the calculated ones, so that the existence of wave-free frequency in swaying oscillation can be verified experimentally.

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