Abstract
In this study, the human characteristics on handling ship with course-instability in a fairway having two bending points have been studied by using ship maneuvering simulator. As a result, the total rudder angle for accelrating turn becomes smaller and the total rudder angle for checking turn becomes larger as the loop width becomes langer in same ship's length. In same loop width, both the total rudder angles become larger as the ship's length becomes longer. In any cases, the maximum lateral deviation does not show remarkably big difference among them. Numerical simulations have been conducted in the same fairway. The Following formula is adopted for rudder angles in the simulations. δ=K_1・x_ε+K_2・Ψ_ε+K_3・Ψ_ε/V Wihere δ : Rudder angles, x_ε : Lateral deviation, Ψ_ε : Heading deviation, Ψ_ε : Rate of turn, V : Present ship's speed, K_1, K_2, K_3 : Human control constant The human control constants are estimated by analyzing the results of the experiments. The prediction of unstable ship motion applied the constants shows good agreement with the motion handled.
