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Abstract
FPSO is widely used during the deep-sea oil and gas exploration operations, for which it is an effective way to keep their position by means of positioning mooring (PM) technology to ensure the long-term reliability of operations, even in extreme seas. Here, a kind of dynamic positioning (DP) controller in terms of structural reliability is presented for the single-point turret-moored FPSOs. Firstly, the mathematical model of the moored FPSO in terms of kinematics and dynamics is established. Secondly, the catenary method is applied to analyze the mooring line dynamics, and mathematical model of one single mooring line is set up based on the catenary equation. Thereafter, mathematical model for the whole turret mooring system is established. Thirdly, a structural reliability index is defined to evaluate the breaking strength of each mooring line. At the same time, control constraints are also considered to design a state feedback controller using the backstepping technique. Finally, a series of simulation tests are carried out for a certain turret-moored FPSO with eight mooring lines. It is shown in the simulation results that the moored FPSO can keep its position well in extreme seas. Besides, the FPSO mooring line tension is reduced effectively to ensure mooring lines safety to a large extent in harsh sea environment.
Highlights
Floating production storage and offloading vessels (FPSOs) are vessels or platforms that float in deep water
The dynamic positioning simulations of the moored inertial turret-moored FPSO are carried out based on above settings and the results are shown in Figures 4, 5, and 6
Structural reliability based state feedback backstepping controllers were proposed with application to the internal turret-moored FPSO model
Summary
Floating production storage and offloading vessels (FPSOs) are vessels or platforms that float in deep water. The offshore oil and gas industry uses them to process crude and natural gas after it is pumped up from deep beneath the ocean floor They may assist in the pumping process itself. Fang and Blanke [6] introduced a novel way to determine the reference position to protect mooring lines and Fang et al [7] extended the former results by using the structural reliability index to calculate optimal setpoint. The formerly proposed structural reliability index by Berntsen et al [4] is equal to the critical reliability index, which cannot make sure that all the mooring lines are not broken down in extreme seas. A dynamic positioning controller in terms of structural reliability is presented for moored FPSOs to. A number of simulation experiments are carried out for a certain singlepoint turret-moored FPSO in extreme seas, concerned more with the safety of mooring lines
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