浮体構造物の定点保持のためのスラスター性能に及ぼす前進速度影響

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As the depth of offshore oil fields increases, chain and anchor mooring system is generally not available to keep positional stability of offshore platform. Recently Dynamic Positioning Systems (DPS) are often used instead of conventional mooring system in deep water. It is known that the control forces generated by the thruster decrease under the influence of forward speed. Therefore, it is considered that the performance of thruster must be taken into account to evaluate control system for DPS. The one of the authors has theoretically and experimentally discussed the influence of forward speed to the control forces generated by thruster that is equipped with ship in the previous paper. This investigation was carried out under the approximation that the ship is substituted with a rectangular wing. However this calculation method is not include an effect of her breadth. Thus, in this paper, we took her shape into account to evaluate performance of the thruster as a function of forward speed. From the result of numerical simulations and experiment of model ship, we got the following concluding remarks. The result of numerical calculation using present method expresses the transition of lateral force and yawing moment generated by the thruster as a function of forward speed more accurately than the method that substitutes ship with a rectangular wing. From the result of numerical calculation, the lateral force generated by the thruster decrease maximum about 50% as increasing forward speed, and yawing moment is not so influenced by forward speed. It is considered that deterioration of thruster performance as a function of forward speed would be taken into account at the design stage of Dynamic Positioning System.
社団法人日本船舶海洋工学会の論文
1993-03-29

浮体構造物の定点保持のためのスラスター性能に及ぼす前進速度影響

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