Myung-Soo Choi

A Study on Position Mooring System Design for the Vessel Moored by Mooring Lines

This paper presents the experimental results about position mooring (PM) system applied to the barge ship. The aim of the PM is to maintain the position and motion of the ships surge and sway directions as desired. In this paper, a system consisting of a barge vessel and mooring lines is mathematically modeled. The position and orientation of the vessel is controlled by changing the tensions of the mooring lines with the subwinch. A comparison of the newly designed mathematical model with the existing PID control method and the results of experiments indicated that the proposed designing method is more efficient than the traditional method.

Torsional Vibration Analysis for Engine Shafting of Fishing Vessel with PTO System and Nonlinear Elastic Coupling

After studying the composition about the torsional shafting of main engine for fishing vessel with Power Take Off (PTO) System, the authors made a computer program using the transfer stiffness coefficient method (TSCM) for analyzing torsional vibration about the shafting with PTO system and nonlinear elastic coupling. The torsional shafting of main engine was separated by 3 types according to the connecting. The torsional shafting of main engine was separated by 3 types according to the connecting condition of main engine with propeller or the PTO system or both of them. In this paper, the change of natural frequencies and natural modes according to connecting condition of torsional shafting and nonlinear elastic coupling were analyzed. The accuracy of the TSCM was confirmed by comparing with the computational results of the Finite Element Method.