Abstract
During the long-term service condition, the mooring line of the deep-water floating platform may fail due to various reasons, such as overloading caused by an accidental condition or performance deterioration. Therefore, the safety performance under the transient responses process should be evaluated in advance, during the design phase. A series of time-domain numerical simulations for evaluating the performance changes of a Floating Production Storage and Offloading (FPSO) with different broken modes of mooring lines was carried out. The broken conditions include the single mooring line or two mooring lines failure under ipsilateral, opposite, and adjacent sides. The resulting transient and following steady-state responses of the vessel and the mooring line tensions were analyzed, and the corresponding influence mechanism was investigated. The accidental failure of a single or two mooring lines changes the watch circle of the vessel and the tension redistribution of the remaining mooring lines. The results indicated that the failure of mooring lines mainly influences the responses of sway, surge, and yaw, and the change rule is closely related to the stiffness and symmetry of the mooring system. The simulation results could give a profound understanding of the transient-effects influence process of mooring line failure, and the suggestions are given to account for the transient effects in the design of the mooring system.
Highlights
Energy is an important fundamental for the development of a country that directly affects the economic lifeline
A time-domain aero–hydroservo–elastic-mooring coupled dynamic analysis was developed for Tension Leg Platform (TLP) floating wind turbine, and the performance changes with broken mooring line
It can be seen that the numerical simulation results of the responses of Floating Production Storage and Offloading (FPSO) and mooring line tensions are both in good agreement with the results of the MARIN model tests; the maximum error is within a reasonable range, which indicates that the established numerical simulation model could be used directly in the following study
Summary
Energy is an important fundamental for the development of a country that directly affects the economic lifeline. A time-domain aero–hydroservo–elastic-mooring coupled dynamic analysis was developed for TLP floating wind turbine, and the performance changes with broken mooring line. The influences of single tendon failure on the transient responses of WindStar TLP floating wind turbine were studied in different environmental conditions [32]. Establishing the numerical model to calculate the coupled dynamic responses of vessel motions and mooring line tensions under the sudden mooring line breakage at a certain time, considering the possible single or two mooring lines failure conditions under the extreme harsh or operating sea conditions, the comprehensive performance evaluation of vessel motion responses under the different mooring line failure conditions, and the corresponding transient responses analysis should be further investigated. The mooring line is generally presumed to be a completely flexible component during the motion analysis; using the governing equation of motion proposed by Berteaux [34], the dynamic of mooring line can be solved by lumped mass method [35]:
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