操縦時船体に働く横力・モーメントの非線型項について

概要

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Generally, studies about hydrodynamic forces acting on ships in the case of maneuvering are divided into three parts, namely, propeller and rudder, ship hull and their interferences. About propeller and rudder, there are many results but interferences have many unknown factores and also studies about ship hull only are not sufficient. Then in this report, we forcus on ship hull only and study her hydrodynamic forces. In previous papers, we represented approximate formulae predicting the hydrodynamic derivatives on ship maneuverability. But when a ship does large movement, it is insufficient to consider only by the hydrodynamic derivatives and we must use the non-linear terms of hydrodynamic forces. In this paper, we investigated about the non-linear terms of hydrodynamic forces experimentally by 10 ocean going ship models. The non-linear terms of lateral force and moment are shown as follows. Y'_<ββ>・|β|・β+Y'_<βr>・β・|r'|+Y'_<rr>・|r'|・r' N'_<rr>・|r'|・r'+(N'_<rrβ>・r'+N_<ββr>・β)・β・r' where β and r' are drift angle and non-dimensional angular velocity respectively. Y'_<ββ> etc. are shown in Fig. 1〜Fig. 6 by items cleared in initial design.
社団法人日本船舶海洋工学会の論文
1979-08-20