초기설계 단계에서 2輔2舵船의 조종운동 계산에 관한 연구

A Study on the Prediction of Maneuvering Motion for a Twin-Screw Twin-Rudder Ship at Initial Design Stage

Mathematical model of maneuvering motion for a single-screw single-rudder ship is established and several applications to the special situations of maneuvering are attempted. While, the mathematical model for twin-screw twin-rudder ship is not studied presented so much, because that type of ship is not popular. Lee et al. have examined the characteristics of such ship by captive model tests in 1988, in Japan. This paper proposes new mathematical models for propeller effective wake (1-wp) and effective neutral rudder angle δR in the case of twin-screw twin-rudder ship. And some maneuvering motions are calculated with proposed models and compared with exact simulations.