쌍축 컨테이너선의 조종성능 특성 연구

Abstract

Recently, the attention to large container ships whose size is greater than 10,000 TEU container ship has been increased due to their increasing demand. The large container ship has twin skeg because of the engine capacity and large beam-draft ratio. In this paper, the maneuvering characteristics of a container ship with twin skeg were investigated through 4DOF(four degree of freedom) HPMM(Horizontal Planar Motion Mechanism) test and computer simulation. The mathematical model for maneuvering motion with 4DOF of twin skeg system was established to include effects of roll motion on the maneuvering motion. And to obtain roll-coupling hydrodynamic coefficients of a container ship, 4DOF HPMM system of KRISO which has a roll moment measurement system was used. HPMM tests were carried out for 12,000TEU class container ships with twin skeg at scantling load condition. Using the hydrodynamic coefficients obtained, simulations were made to predict the maneuvering motion. Rudder forces of twin-rudders were measured at the angles of drift and rudder. The neutral rudder angles with drift angles of ship was quite different with those of single skeg ship. So other treatment of flow straighten coefficient was used, the simulation results was compared with general simulation result. The treatment of experimental result at static drift and rudder test was very important to predict the maneuverability of a container ship with twin skeg.