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When a ship is turning, the rotational motion is about a vertical axis. The postition of this axis is influenced by the ship's shape, the ship's motion and the point of impact of various forces acting on the ship. The axis moves about with a change in the lateral and rotational motion of the ship, we call the position of this axis a pivot point. In the present paper, how the pivot point wanders about with a change in t he forces that affect the ship is discussed taking into account the rudder effect, the propeller effect, the wind effect and the effect of tug as sistance. The numerical examinations were carried out using a computer analysing system which can generate ship's motion under the ma thematical simulation model and show simultaneously the estimated position of the pivot point on a graphic display.

Estimating the Position of the Pivot Point in Ship Handling and Analysing its Characteristics