FPSOの定点保持のための制御系の設計について

概要

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Floating Production Storage and Offloading (FPSO) or Production and Testing Ship (PTS) are often required to keep their position with high accuracy under influence of external forces. In order to keep their position at deep sea, dynamic positioning system (DPS) is often used. The linear quadratic (LQ) optimal regulator theory is mainly applied to design control system of DPS. However, it is very complicated and difficult to select suitable weighting matrices in the performance index manually to obtain optimal control input. So, recently the inverse linear quadratic (ILQ) optimal servo theory has been proposed. In this method, it is able to design a control system which has no interaction among the state variables, and it is also able to express the optimal feedback gain in terms of the system matrices and the design parameters. In this paper, we applied the ILQ optimal servo theory to design the control system of DPS for a FPSO. In ILQ optimal servo theory, time constant T_i as the design parameters have much influence on the performance of the control system. From the numerical simulations, it is found that T_i should be selected as small as possible according to intensity of external disturbances, considering performance of the thruster. It is also found that design using the ILQ optimal servo theory would be useful for DPS for FPSO.
社団法人日本船舶海洋工学会の論文
1998-03-29