Browse > Article
http://dx.doi.org/10.26748/KSOE.2018.098

Grid-Based Set Point Generation Strategy for Position Control of Dynamic Positioning Assisted Mooring System  

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)
Publication Information
Journal of Ocean Engineering and Technology / v.33, no.2, 2019 , pp. 99-105 More about this Journal
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.
Keywords
DP assisted mooring system; Tension reduction control; Grid; Set point; Fuel consumption reduction;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Barth Berntsen, P.I., Aamo, O.M., Leira, B.J., 2008. Thruster Assisted Position Mooring Based on Structural Reliability. International Journal of Control, 81(9), 1408-1416. https://doi.org/10.1080/00207170701813844   DOI
2 Nguyen, D.T., Sorensen, A.J., 2009a. Setpoint Chasing for Thrusterassisted Position Mooring. IEEE Journal of Oceanic Engineering, 34(4), 548-558. https://doi.org/10.1109/JOE.2009. 2034553   DOI
3 Nguyen, D.T., Sorensen, A.J., 2009b. Switching Control for Thruster-assisted Position Mooring. Control Engineering Practice, 17(9), 985-994. https://doi.org/10.1016/j.conengprac. 2009.03.001   DOI
4 Ryu, S., Kim, M.H., 2003. Coupled Dynamic Analysis of Thruster-assisted Turret-moored FPSO. Proceedings of OCEANS 2003, IEEE, 3, 1613-1620. https://doi.org/10.1109/OCEANS.2003.178114