浮体構造物の定点保持に及ぼすスラスター性能の影響について

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Dynamic Positioning Systems (DPS) are used in offshore platforms to keep their positional stability in deep waters. In the previous paper, we examined the influence of unsteady forces and the time lag between the actuation and the final response of thruster on performance of the DPS. As the result of numerical simulations, we clarified that the rate of change of the thruster power output has a nearly dominating influence on the total performance of the control system. Authors have already proposed the calculation method to estimate the influence of forward speed of the offshore platform on the thrust of thruster. From the numerical calculation using this method, authors showed that the lateral force induced by the thruster decrement maximum about 50% as increasing forward speed of the offshore platform. As the thrust of thruster is decreased as increasing forward speed, it is considered that the control system can't get expected control forces. Furthermore, it is considered that performance of the DPS is changed by errors included in measured state variables. In this paper, we examined the performance of the DPS considering the decrease of thrust of the thrusters due to the motion of the offshore platform and errors included in measurements. From the numerical simulation, we got the following concluding remarks. The motion of the offshore platform considering decrease of thrust of the thruster is different remarkably compared with the motion without forward speed effect. Therefore, at the design stage, output power of thruster must be determined considering decrease of thrust due to the motion of the offshore platform. As for the errors included in the measurements of state variables, they have little influence on the performance of the DPS.
社団法人日本船舶海洋工学会の論文
1994-09-04

浮体構造物の定点保持に及ぼすスラスター性能の影響について

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