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Design and Analysis of Mooring System for Floating Offshore Structures
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Design and Analysis of Mooring System for Floating Offshore Structures

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Ocean Engineering".

Deadline for manuscript submissions: 10 December 2024 | Viewed by 2940

Special Issue Editors

Prof. Dr. Dongsheng Qiao

E-Mail Website
Guest Editor
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
Interests: mooring; hydrodynamics; floating structures; wind and wave energy; motion control
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Zhen Guo

E-Mail Website
Guest Editor
Zhejiang Province Key Laboratory of Offshore Geotechnics and Material, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
Interests: wave–seabed–structure interaction; offshore foundation; submarine pipeline; mooring system
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Liqin Liu

E-Mail Website
Guest Editor
State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation, Tianjin University, Tianjin 300072, China
Interests: dynamic response; offshore wind turbine; floating platform

Special Issue Information

Dear Colleagues,

The mooring system is the key basis of all floating structures, and its positioning ability is critical for operational safety. There are different design and analysis challenges for various floating structures working at different water depths with different design principles. The mooring system connects floating structures to the anchor foundation, and the systematic design of these systems and the interaction analysis between them are at the frontier of research in both industry and academia circles. We would like to invite papers on the topic of the design and analysis of mooring systems for floating offshore structures, including offshore platforms, wind turbines, wave energy converters, photovoltaic power stations, submerged floating tunnels, etc.

Prof. Dr. Dongsheng Qiao
Prof. Dr. Zhen Guo
Prof. Dr. Liqin Liu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Journal of Marine Science and Engineering is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • mooring system
  • anchor foundation
  • floating structures
  • offshore platform
  • wind turbine
  • wave energy converter
  • photovoltaic power station
  • submerged floating tunnel
  • motion analysis and control
 

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Published Papers (4 papers)

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Research

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21 pages, 7592 KiB  
Article
Multi-Objective Optimization Design of a Mooring System Based on the Surrogate Model
by Xiangji Ye, Peizi Zheng, Dongsheng Qiao, Xin Zhao, Yichen Zhou and Li Wang
J. Mar. Sci. Eng. 2024, 12(10), 1853; https://doi.org/10.3390/jmse12101853 - 17 Oct 2024
Viewed by 575
Abstract
As the development of floating offshore wind turbines (FOWTs) progresses from offshore to deeper sea, the demands on mooring systems to ensure the safety of the structure have become increasingly stringent, leading to a concomitant rise in costs. A parameter optimization method for [...] Read more.
As the development of floating offshore wind turbines (FOWTs) progresses from offshore to deeper sea, the demands on mooring systems to ensure the safety of the structure have become increasingly stringent, leading to a concomitant rise in costs. A parameter optimization method for the mooring system of FOWTs is proposed, with the mooring line length and anchor radial spacing as the optimization variables, and the minimization of surge, yaw, and nacelle acceleration as the objectives. A series of mooring system configuration samples are generated by the fully analytical factorial design method, and the open source program OpenFAST is employed to simulate the global responses in the time domain. To enhance the efficiency of the optimization process, a multi-objective evolutionary algorithm, Non-dominated Sorting Genetic Algorithm II (NSGA-II), is utilized to find the Pareto-optimal solutions, alongside a Kriging model, which serves as a surrogate model for the FOWTs. This approach was applied to an IEC 15MW FOWT to demonstrate the optimization procedure. The results indicate that the integration of the genetic algorithm and the surrogate model achieved rapid convergence and high accuracy. Through this optimization process, the longitudinal motion response of FOWTs is reduced by a maximum of 6.46%, the yaw motion by 2.87%, and the nacelle acceleration by 11.55%. Full article
(This article belongs to the Special Issue Design and Analysis of Mooring System for Floating Offshore Structures)
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18 pages, 5267 KiB  
Article
Research on the Effect of a Heave Plate on the Dynamics of the Floating Wind Turbine Using Model Tests
by Lidong Yang, Yuting Jiang, Shibo Guo, Zihe Lin, Wanru Deng and Liqin Liu
J. Mar. Sci. Eng. 2024, 12(10), 1808; https://doi.org/10.3390/jmse12101808 - 10 Oct 2024
Viewed by 686
Abstract
The increasing demand to harness offshore wind resources has pushed offshore wind turbines into deeper waters, making floating platforms more economically feasible than bottom-fixed ones. When the incident wind and wave forces act on the floating wind turbine, the floating platform will experience [...] Read more.
The increasing demand to harness offshore wind resources has pushed offshore wind turbines into deeper waters, making floating platforms more economically feasible than bottom-fixed ones. When the incident wind and wave forces act on the floating wind turbine, the floating platform will experience oscillations around its equilibrium position in six degrees of freedom (DOFs). Significant floater motions can affect the aerodynamic power output, increase the failure risk, and even shorten the operational lifetime, especially under a harsh offshore environment. To improve the dynamic behavior of the floating platform, this research designed a heave plate for an OC4-Deepcwind wind turbine. The dynamic performance of the wind turbine was specifically investigated based on a series of wave-basin model tests, including free decay tests, regular wave tests, and irregular wave with steady wind tests. The results show that the heave plate increases damping in heave and pitch motions. The weakening effect on the heave and pitch motion is obvious in the wave period of 15–20 s and 20–27 s, respectively. However, the arrangement of the heave plate may exacerbate the fluctuation of the force and moment at the bottom of the tower. Full article
(This article belongs to the Special Issue Design and Analysis of Mooring System for Floating Offshore Structures)
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21 pages, 6502 KiB  
Article
Global Responses of Exposed and Suspended Submarine Cables Due to Anchor Dragging
by Xiaowei Huang, Daoyu Jiang, Zhenjin Cen, Haolin Li, Zhenkui Wang and Zhen Guo
J. Mar. Sci. Eng. 2024, 12(9), 1628; https://doi.org/10.3390/jmse12091628 - 12 Sep 2024
Viewed by 643
Abstract
Anchor damage is one of the main risk factors for the safe operation of submarine cables. Additionally, due to a scour effect induced by seabed currents, submarine cables are prone to exposure or even suspension, increasing the risk of being dragged by anchors. [...] Read more.
Anchor damage is one of the main risk factors for the safe operation of submarine cables. Additionally, due to a scour effect induced by seabed currents, submarine cables are prone to exposure or even suspension, increasing the risk of being dragged by anchors. Therefore, it is necessary to study the global response of exposed and suspended submarine cables subjected to anchor dragging. In this study, the tensile and bending stiffnesses of submarine cables are calculated by theoretical methods, and the accuracy of these calculations is verified by establishing a detailed finite element model. Then, the mechanical properties of the submarine cables are equivalently modeled using beam elements, and a large-scale finite element model for exposed and suspended cables under anchor dragging is established. Considering different dragging forces, exposed lengths, spanning lengths, and spanning heights, the overall deformation and mechanical responses of exposed and suspended cables are analyzed separately. The results show that under dragging forces, axial forces are uniformly distributed along exposed and suspended segments, while bending moments concentrate at the central hooking area and the ends of exposed and suspended segments. The influence of dragging force, exposed length, spanning length, and spanning height on the stress and deformation of submarine cables is significant. The results can be used for submarine cable damage assessments caused by anchor dragging. Full article
(This article belongs to the Special Issue Design and Analysis of Mooring System for Floating Offshore Structures)
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Review

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14 pages, 4404 KiB  
Review
Advances in Research for Mechanical Characteristics of Vertically Loaded Anchors for Offshore Platforms under Cyclic Loads
by Dapeng Li, Baoliang Zhang, Guoqi Xing and Jian Li
J. Mar. Sci. Eng. 2024, 12(9), 1581; https://doi.org/10.3390/jmse12091581 - 7 Sep 2024
Viewed by 604
Abstract
Vertically loaded anchors (VLAs) are widely used as mooring foundations in marine environments. Their working conditions typically involve deep-sea seabed, frequently subjected to cyclic loads induced by wind, waves, and currents. Therefore, understanding the mechanical properties of VLAs under cyclic loading is essential [...] Read more.
Vertically loaded anchors (VLAs) are widely used as mooring foundations in marine environments. Their working conditions typically involve deep-sea seabed, frequently subjected to cyclic loads induced by wind, waves, and currents. Therefore, understanding the mechanical properties of VLAs under cyclic loading is essential for ensuring the safety of mooring systems. This paper summarizes the current research status on the mechanical properties of VLAs under cyclic loading, analyzing the mechanisms by which cyclic loads affect these properties. Additionally, it reviews and summarizes the research methods applied to studying VLAs under cyclic loading, discussing the issues inherent in various methodologies. Finally, it provides an outlook on future research into VLAs under cyclic loading, laying the groundwork for subsequent studies on the bearing mechanisms of novel VLAs, such as the double-plate vertically loaded anchor (DVLA), under cyclic loading. Full article
(This article belongs to the Special Issue Design and Analysis of Mooring System for Floating Offshore Structures)
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