선박의 상호간섭을 고려한 안전통항거리에 관한 연구

Abstract

This thesis suggests a standard distance of safe passing considering ship to ship interaction under circumstances such as moored ship passing, head-on encountering and two ships in overtaking. It may provides useful information to the ship's operators on the marine spot.

Ship handling simulator is employed to derive the non-dimensional coefficients of interaction forces and method of MLIT(Ministry of Land, Infrastructure, Transport and Tourism of Japan) is used to calculate the rudder angle of course keeping and the separation of two ships.

For decades, prediction skill of hydrodynamic interaction between two ships in close proximity has been developed by many researchers at home and aboard. In order to validate the accuracy of interaction skill in ship handling simulator, error analyses for the representative five different ships under three situation of interaction are conducted by comparing the theoretical calculation and simulation calculation.

With the verified ship handling simulator, simulations are widely performed to find the appropriate separation between two ships and course-keeping rudder angles under interaction circumstances. In order to derive the optimum distances of safe passing, diverse parameters such as the ship's length, ship's draft, speed of two ships, water depth, lateral distance between two ships, longitudinal distance between two ships are considered.

Also, this thesis handles many ship models as target ships such as container ship(Panamax and over Panamax), bulk carrier, VLCC(including Suezmax and Aframax), oil tanker, LNG carrier, passenger cruise ship, passenger car ferry, ro-ro passenger ferry, car carrier, fishery training ship, articulated tug-barge. Characteristics of ship's motions under interaction circumstances is represented by the non-dimensional coefficients of surge force, sway force and yaw moment.

Safe distances of panamax container ship under moored passing condition are suggested according to the passing speeds of 7knots, 9knots and 12knots. Also, the safe distances of panamax container ship under head-on encountering and overtaking conditions are researched by considering the influence of speeds, ratio of own ship length to target ship length, ratio of water depth to the ship's draft.

Safe distances of panamax container ship according to the water depth are thought to be useful for the ship's operators on the marine spot. In addition, safe distances according to the own ship's draft and the target ship's draft are investigated with influence of the water depth.

Finally, safe distances of minimum 1 cable and 0.7(own ship's length overall) are required to pass the object ships using a rudder angle of 10 degree for the panamax container ship and VLCC of manoeuvering speed in harbour and waterways under circumstances such as moored ship passing, head-on encountering and overtaking conditions.