Control system design and model experiments on thruster assisted mooring system

Masahiko Nakamura; Hiroyuki Kajiwara; Wataru Koterayama; Tadahiro Hyakudome

Control system design and model experiments on thruster assisted mooring system

Masahiko Nakamura, Hiroyuki Kajiwara, Wataru Koterayama, Tadahiro Hyakudome

Research output: Contribution to conference › Paper › peer-review

Abstract

The paper is concerned with the dynamic positioning control of a moored floating platform model. Moorings are used to maintain the position of the platform against quasi-constant external forces induced by current and wind. The control purpose is to suppress the slow drift oscillation due to drifting force in irregular waves using thrusters so that they do not respond to the linear exciting force in the wave frequency range. Control of motions in the wave frequency region has to be ignored because the amplitude of those motions is smaller than that of the slow drift oscillation and enormous thruster power is needed to control them. The problem was formulated in the framework of H_∞ control, was solved using the LMI (linear matrix inequalities) Control Toolbox on Matlab. Model experiments in oblique incident waves were carried out and some successful results are shown.

Original language	English
Pages	641-648
Number of pages	8
Publication status	Published - 1997
Event	Proceedings of the 1997 7th International Offshore and Polar Engineering Conference. Part 3 (of 4) - Honolulu, HI, USA Duration: May 25 1997 → May 30 1997

Other

Other	Proceedings of the 1997 7th International Offshore and Polar Engineering Conference. Part 3 (of 4)
City	Honolulu, HI, USA
Period	5/25/97 → 5/30/97

All Science Journal Classification (ASJC) codes

Energy Engineering and Power Technology
Ocean Engineering
Mechanical Engineering

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Control system design and model experiments on thruster assisted mooring system. / Nakamura, Masahiko; Kajiwara, Hiroyuki; Koterayama, Wataru; Hyakudome, Tadahiro.

1997. 641-648 Paper presented at Proceedings of the 1997 7th International Offshore and Polar Engineering Conference. Part 3 (of 4), Honolulu, HI, USA, .

Research output: Contribution to conference › Paper › peer-review

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year = "1997",

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AB - The paper is concerned with the dynamic positioning control of a moored floating platform model. Moorings are used to maintain the position of the platform against quasi-constant external forces induced by current and wind. The control purpose is to suppress the slow drift oscillation due to drifting force in irregular waves using thrusters so that they do not respond to the linear exciting force in the wave frequency range. Control of motions in the wave frequency region has to be ignored because the amplitude of those motions is smaller than that of the slow drift oscillation and enormous thruster power is needed to control them. The problem was formulated in the framework of H∞ control, was solved using the LMI (linear matrix inequalities) Control Toolbox on Matlab. Model experiments in oblique incident waves were carried out and some successful results are shown.

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