HPMM 시험에 의한 대형 쌍축 컨테이너선의 조종성능 추정

Abstract

Recently, the attention to large container ships whose size is comparable with large tankers and speed is very high has been increased due to their increasing demand. As IMO adopted finally IMO maneuvering standards in 2002, it is necessary to investigate the maneuvering performance of these new large container ships. In this paper, the maneuvering characteristics of a large container ship with twin-propellers and twin-rudders were investigated through HPMM(Horizontal Planar Motion Mechanism) test and computer simulation. The mathematical model for maneuvering motion with 4DOF(four degree of freedom) of twin-propellers and twin-rudders 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 and a roll motion mechanism was used. With 4DOF HPMM system, HPMM tests were carried out for 12,000TEU class container ships with twin-propellers and single porpeller at full load condition. Using the hydrodynamic coefficients obtained, simulations were made to predict the maneuvering motion. To predict the performance of twin-propellers and twin-rudders system two rudder torque gages were used, and forces of twin-rudders were measured at the angles of drift and rudder. In this paper, maneuvering characteristics of a large container ship with twin-propellers and twin-rudders is discussed based on the experimental and simulation study of a 12,000TEU class container ship, and the simulation results are compared with those of single propeller and single rudder container ship.