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Manoeuvrability of a ship under severe environmental conditions is an important research subject for safety of navigation. As one of such problems, prediction calculations of a ship manoeuvring motion in waves have been praticed recently. When estimating a manoeuvring motion of a ship in waves, we usually use a method in which ship motion is approximated as a superposed motion of ship manoeuvring motion affected by wave drifting force and ship oscillation by wave exciting force. But, theoretical foundation of this widely used method has not been necessarily shown cleary yet. In the case of moored and positioned vessel, it was shown that the assumptions of superposed motion of high and low frequency motion is theoretically reasonable by Triantafyllou. But, in the case of a ship manoeuvring motion under ordinary navigation speed, theoretical examination is not yet enough, and there needs further researches in order to apply his method to ship manoeuvring motion in waves. In this paper, on the prediction method of ship manoeuvring motion in waves as a superposed motion approximations, we examined the problem qualitatively in boundary conditions for fluid motion, hydrodynamic forces acting on ship hull and equation of ship motion by using Triantafyllou's multi time scale expansion method. As a result, the follows become clear. Ship motion in waves can be treated as a superposed motion of first order high frequency motion and first plus second order low frequency motion under several assumptions shown in this paper, and widely used method for prediction of ship manoeuvring motion in waves is theoretically reasonable in its fundamental stand. Wave drifting force is composed of three components, one of them is automatically included in the equation of motion, and the other two components are necessary to estimate for prediction calculation of ship manoeuvring motion in waves.
社団法人日本船舶海洋工学会の論文
1990-08-26

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