Effects of Damaged Fiber Ropes on the Performance of a Hybrid Taut-Wire Mooring System

Lian, Yushun; Yim, Solomon C.; Zheng, Jinhai; Liu, Haixiao; Zhang, Nan

doi:10.1115/1.4044723

Cited by 14 publications

(7 citation statements)

References 28 publications

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“…General mainstream technique for determining the hydrodynamic coefficient and environmental fluid force of marine structures, especially the floating structures, is almost based on the theories of PFT (Lian et al, 2020;Qiao et al, 2020), and some business software, such as the SESAM of DNV, WAMIT, AQWA of ANSYS, etc., on the basis of the PFT are used to investigate the frequency-and/ or time-domain hydrodynamic parameters and fluid forces on floating bodies. Kim et al (2014) proposed a hydroelastic design contour practically used for the preliminary design of pontoon-type rectangular VLFSs, and the PFT was used to model the fluid forces on VLFS.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic constraint loads estimation on connectors of column-pontoon type very large floating structure (CP-VLFS) under wave stimulation

Han²,

Ji³

et al. 2023

Front. Mar. Sci.

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Column-pontoon type very large floating structure (CP-VLFS) operated at the deep and sea faraway areas are generally exposed to the extremely complex wave conditions. The connectors of CP-VLFS are generally subjected to complicated hydrodynamic constraint loads when the modules of CP-VLFS are stimulated by the long-tern wave forces. The general method for analyzing the hydrodynamic performances for marine floating structures and their components is almost on the basis of potential flow/fluid theory (PFT), but its algorithm principle is relatively complex and would consume plenty of computing time. During the preliminary design and scheme comparison stages for CP-VLFSs, the hydrodynamic results for CP-VLFSs’ modules and their connectors required to be rapidly determined. Hence, a rapid and high-efficiency estimating method for time-domain hydrodynamic constraint loads of connectors on CP-VLFS considering the mathematical and mechanical model of rigid module and flexible connector (RMFC) is developed via this paper. During this estimation method, the Morison theory of floating body is employed to assess the hydrodynamic excitation forces by random and irregular wave (RIW) on CP-VLFS structures, and a series of concise formulas for estimating the hydrodynamic constraint loads of CP-VLFS connectors are derived based on the geometrical relationship of the CP-VLFS modules’ motion. For this paper’s explorations, a three-module CP-VLFS model is considered as a case, and the time-domain hydrodynamic constraint loads of CP-VLFS’s connectors are determined under the RIW stimulations with different wave angles. Hydrodynamic constraint loads of CP-VLFS connectors estimated by this paper agree well with the results of PFT and those of physical experiment, validation the methodologies developed by this paper. Some useful conclusions may provide significant technical supports for hydrodynamic characteristics of CP-VLFS modules and their connectors optimization.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic constraint loads estimation on connectors of column-pontoon type very large floating structure (CP-VLFS) under wave stimulation

Han²,

Ji³

et al. 2023

Front. Mar. Sci.

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“…As a necessary technological solution for deep-sea wind energy development, floating wind turbines have become a popular research topic in offshore wind energy utilization. The mooring system is critical in ensuring the safe operation of floating wind turbines in harsh environments [1]. The failure of mooring systems can result in substantial losses [2].…”

Section: Introductionmentioning

confidence: 99%

Effects of Mooring Line with Different Materials on the Dynamic Response of Offshore Floating Wind Turbine

Lian,

Zhong,

Zheng

et al. 2023

JMSE

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The influence of mooring systems with lines of different material on the dynamic response of a floating wind turbine is studied using a 5 MW OC4-DeepCwind semi-submersible wind turbine as a representative prototype in this study. Two types of mooring systems were designed using the MoorDyn module in OpenFAST software (v3.1.0): one uses chains, and the other uses a hybrid mooring line composed of chains and high-strength polyethylene (HMPE) ropes. A wind turbine with two types of mooring systems was simulated using the OpenFAST software. The results show that the floating wind turbine moored with the hybrid lines exhibited a larger heave and pitch motion than that moored using chains alone. At the same time, the surge displacement was smaller than that of the wind turbine using chains alone. In terms of mooring line tension, the mean and amplitude values of the hybrid mooring system at the location examined were smaller than those of the chain mooring system. Thus, using HMPE ropes in the mooring system can significantly reduce line loads. In addition, the HMPE ropes used in the floating wind turbine mooring system did not affect the power generation of the wind turbine. This study provides promising support data and observations for applying high-strength polyethylene (HMPE) ropes in mooring systems for floating wind turbines.

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“…Ma and Sun [24] introduced the software of FPSO Mooring Management System to track and control the FPSO mooring situation, including the main failures of the mooring system. Lian et al [25,26] analyzed the effects of different levels of damaged ropes on the dynamic responses of FPSO and its taut-wire mooring system.…”

Section: Introductionmentioning

confidence: 99%

Transient Responses Evaluation of FPSO with Different Failure Scenarios of Mooring Lines

Qiao

Yan

et al. 2021

JMSE

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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.

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Effects of Damaged Fiber Ropes on the Performance of a Hybrid Taut-Wire Mooring System

Cited by 14 publications

References 28 publications

Hydrodynamic constraint loads estimation on connectors of column-pontoon type very large floating structure (CP-VLFS) under wave stimulation

Hydrodynamic constraint loads estimation on connectors of column-pontoon type very large floating structure (CP-VLFS) under wave stimulation

Effects of Mooring Line with Different Materials on the Dynamic Response of Offshore Floating Wind Turbine

Transient Responses Evaluation of FPSO with Different Failure Scenarios of Mooring Lines

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