浮体構造物の定点保持に関する一考察

概要

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It is necessary that offshore platforms keep the position under the external forces such as ocean current or wind. Generally, the control systems to keep the position of offshore platform are designed mainly based on PID control theory. However, the motions of offshore platform complicate with the components of surge, sway and yaw motions. Then it will be of the most importance taking into account those components in the control systems. In this paper, we apply the linear optimal regulator control theory to the Dynamic Positioning System (DPS) of an offshore platform in order to take into account the motions of surge, sway and yaw. Furthermore, we propose three types of thruster system which are equipped with tunnel-type thrusters and rotatable thrusters, and the characteristics of each type of thruster system are discussed. The computer simulations of the motion are performed for a semi-submersible two lower hulls type platform under the steady external forces. From the results of simulation, it is shown that the control system, which is equipped with rotatable thrusters, is effective to keep the position of the platform under steady external forces such as current and wind. It is understood that the control system for rotatable thrusters can get more effective control forces comparing with the tunnel-type thrusters.
社団法人日本船舶海洋工学会の論文
1991-09-04