波中の旋回に関する一計算

概要

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A ship progressing in waves performs heaving, pitching, rolling, yawing, swaying, and drifting motion due to the dynamical forces of waves, and these motions affect the manoeuvrability of the ship. L. J. Rydill investigated the steered motion of a ship in regular waves using the linear theory, in consideration of the periodical lateral force and yawing moment as originally assumed by W. Froude. But a ship is drifted in direction of wave propagation due to the phase lag between the exciting force of waves and the ship motions as shown by Y. Watanabe. In this paper the authors investigated the influence of drifting force on the course keeping and the turning of the ship. Main conclusions are as follows:- 1. A ship progressing in waves has a tendency to turn to the weatherside due to the drifting force, and the greater its deviation is, the less dynamical stability of the ship. 2. The effects of the drifting force on the turning ship depends on the following equation, E^1=(C_<mα>-h_mω_0)C_<N2>-(C_<m2>+h_mω_0+m_xω_0α_0)C_<m2> >0 radius of turning becomes larger when a ship turns to leeside <0〃〃〃 to weatherside Nomenclature of this equation shown in Table 1. In generaly this is possitive at the course angle x=90° 3. A locas of turning ship in relatively gentle waves is nearly same as that of in calm water.
社団法人日本船舶海洋工学会の論文
1966-02-28