7. A Practical Calculation Method of Ship Maneuvering Motion at Initial Design Stage

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This paper presents a practical calculation method to predict the ship maneuverability at the initial design stage. Supposing that principal particulars of ship hull, propeller and rudder are given at the stage of the ship initial design, an attempt is made to calculate the maneuvering motion utilizing these principal particulars as basic input data. The mathematical model which describes the ship maneuvering motion is based on the coupled equations of surge, sway, yaw, roll and propeller revolution. Computations are made for seven typical merchant ships covering various kinds and sizes of ships. In order to examine the validity of the calculation method of this paper for wide range of the maneuvering characteristics, comparisons of the computed results with the results of the full-scale trials are made for three kinds of typical characteristics, namely the turning motion with 35° rudder, the 10°-10° Z-maneuver response and the steady turning performance. The computed results show satisfactory agreements with the full-scale trial results for various kinds and sizes of ships, and for wide range of the maneuvering characteristics. It can be concluded that the calculation method proposed in this paper is very useful and powerful for the predictions of the ship maneuverability at the initial design stage.
社団法人日本船舶海洋工学会の論文