저속시 선체에 작용하는 조종유체력 및 조종성능에 관한 연구

Hydrodynamic Forces and Manoeuvring Characteristics of Ships at Low Advance Speed

출발, 정지, 후진, 가속, 감속 등을 포함하는 저속 항행시의 조종운동을 예측하기 위해서, 선체, 프로펠러, 타에 작용하는 유체력의 특징을 검토하여 이를 수식모델화 하였으며, 제안된 수식모델을 이용하여 유조선, 가스운반선 두 선박에 대해 저속시의 조종운동 시뮬레이션 계산을 수행하여 실험결과와 비교 검토하였다

One practical method has already been proposed for predicting the characteristics of ship manoeuvring motions at relatively high advance speed [19]. Howeverf, this method can hardly be applied to motions of ships in starting, stopping, backing and slow steaming conditions, even though such extensive motions are of vital importance from a safety point of view particularly in harbour areas. The method presented here aims at predicting the characteristics of ship manoeuvring at low advance speed, which covers starting, stopping, backing and slow steaming conditions. The force mathematical models at large angles of incidence to the hull as well as under the wide range of propeller operations are formulated. Simulations of various manoeuvres at low advance speed are carried out for two types of merchant ship, I.e. a LNGC and a VLCC. Comparisons between simulations and corresponding full-scale measurements [10], [15] or free-running model tests [6],[10] provide a first verification of the proposed mathematical models.