Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Grid-Based Set Point Generation Strategy for Position Control of Dynamic Positioning Assisted Mooring System

DP보조계류시스템의 위치제어를 위한 격자 기반의 제어목표점 선정 전략

  • Choi, Sol-Mi (Division of Naval Architecture and Ocean Systems Engineering, Korea Maritime and Ocean University) ;
  • Lee, Jaeyong (Department of Naval Architecture and Ocean Engineering, Dong-eui University) ;
  • Lee, Seung Jae (Division of Naval Architecture and Ocean Systems Engineering, Korea Maritime and Ocean University) ;
  • Lee, Daesoo (Department of Naval Architecture and Ocean Engineering, Dong-eui University) ;
  • Jung, Kwang-Hyo (Department of Naval Architecture and Ocean Engineering, Pusan National University)
  • 최솔미 (한국해양대학교 조선해양시스템공학과) ;
  • 이재용 (동의대학교 조선해양공학과) ;
  • 이승재 (한국해양대학교 조선해양시스템공학과) ;
  • 이대수 (동의대학교 조선해양공학과) ;
  • 정광효 (부산대학교 조선해양공학과)
  • Received : 2019.01.01
  • Accepted : 2019.02.22
  • Published : 2019.04.30
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Abstract

Unlike typical a dynamic positioning (DP) system, a DP-assisted mooring system must determine a set point (SP) that can ensure a mooring tension safety range to prevent an excessive increase in mooring tension. In this paper, a new algorithm for determining the SP is suggested in order to reduce the tension on all the mooring lines. To determine the SP, a working area around the vessel is represented by a rectangular grid. Thus, the size of the grid area is limited considering the offset of a vessel with a mooring system. At each grid's nodes, the resultant tension from all the mooring lines is estimated using the time history of the tension and vessel's position. The results of static analyses for each grid position are used to estimate the global tension. Consequently, the SP is automatically selected as a position satisfying criterion for minimizing the total tension. In order to validate the suggested algorithm, a motion simulation with the control system in the time domain and a discussion of the results are presented.

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References

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