Marine Structures最新文献_第6页

Optimization design of helical carcass supported flexible cryogenic pipe based on BP-MOWOA 基于BP-MOWOA的螺旋骨架支撑低温柔性管道优化设计

IF 4 2区工程技术

Marine Structures Pub Date : 2025-06-27 DOI: 10.1016/j.marstruc.2025.103886

Jun Yan , Yufeng Bu , Ruonan Zhou , Lizhe Jiang , Chunyu Zhao , Yuanchao Yin

{"title":"Optimization design of helical carcass supported flexible cryogenic pipe based on BP-MOWOA","authors":"Jun Yan , Yufeng Bu , Ruonan Zhou , Lizhe Jiang , Chunyu Zhao , Yuanchao Yin","doi":"10.1016/j.marstruc.2025.103886","DOIUrl":"10.1016/j.marstruc.2025.103886","url":null,"abstract":"<div><div>In recent years, the demand for offshore liquefied natural gas (LNG) exploration and transportation has set higher performance standards for cryogenic pipes, particularly the helical carcass supported flexible cryogenic pipe (hc-FCP). Due to its multi-layered, spiral-wound, and non-bonded structure, optimizing the design of hc-FCP presents significant challenges. This paper proposes an optimization approach combining the backpropagation neural network and the multi-objective whale optimization algorithm (BP-MOWOA) to address the multi-objective optimization of hc-FCP structures. First, a high-precision finite element model of the hc-FCP was established and validated through experimental data. The model was used to generate a large dataset that captured the mechanical performance of hc-FCP under various operating conditions. Second, a backpropagation (BP) neural network was trained to predict the axial tensile and bending stiffness of the hc-FCP, forming the basis for the optimization process. Lastly, the BP-MOWOA was employed to optimize critical design parameters, such as the winding angles of the reinforcement layers, to achieve maximum axial tensile stiffness and reduced bending stiffness with minimal material consumption. The optimized design improved axial tensile stiffness by 24.35 %, reduced bending stiffness by 2.99 %, and lowered material consumption by 1.84 %. These results demonstrate the effectiveness of the BP-MOWOA in optimizing hc-FCP structures for enhanced performance and cost-efficiency, providing a flexible solution for engineering applications in varying operational conditions.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103886"},"PeriodicalIF":4.0,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144492065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of fluid-structure interaction vibration and fatigue life of fluid-filled pipelines in underwater vehicles 水下航行器充液管道流固耦合、振动及疲劳寿命分析

IF 4 2区工程技术

Marine Structures Pub Date : 2025-06-24 DOI: 10.1016/j.marstruc.2025.103885

Xinyue Du , Dongyang Chen , Qiaogao Huang , Yaochen Lin , Jing Liu , Guang Pan

{"title":"Analysis of fluid-structure interaction vibration and fatigue life of fluid-filled pipelines in underwater vehicles","authors":"Xinyue Du , Dongyang Chen , Qiaogao Huang , Yaochen Lin , Jing Liu , Guang Pan","doi":"10.1016/j.marstruc.2025.103885","DOIUrl":"10.1016/j.marstruc.2025.103885","url":null,"abstract":"<div><div>This study investigates vibration characteristics and fatigue damage mechanisms in underwater vehicles subjected to complex coupled loading (external random excitation and internal fluid pulsation). Focusing on fluid-filled straight and bent pipes, this research complements existing analyses of multi-type pipelines and coupled vibration fatigue. A bidirectional fluid-structure interaction time-domain analysis framework is established based on a three-dimensional finite element model to quantify dynamic responses and predict fatigue life. Key findings demonstrate that: (1) Fluid pulsation dominates stress distribution, with fluid-filled pipes exhibiting 40 % lower modal frequencies than empty pipes, indicating that the incompressibility of the fluid suppresses pipe deformation; (2) Straight pipe configurations show a 42 % reduced equivalent stress compared to bent counterparts, which highlights bend-induced vibration amplification; (3) Vortex-induced pressure fluctuations at pipe bends accelerate fatigue damage progression. These findings provide practical significance for analyzing the dynamic behavior and damage resistance of piping systems, as well as enhancing the safety and reliability of engineered pipelines.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103885"},"PeriodicalIF":4.0,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical analysis of elastic collapse in metallurgical clad pipes under external pressure 外压作用下冶金包层管道弹性坍塌的理论分析

IF 4 2区工程技术

Marine Structures Pub Date : 2025-06-20 DOI: 10.1016/j.marstruc.2025.103861

Mingjie Hu , Haohong Jian , Menglan Duan , Qiwei Wu , Weifeng Zheng

{"title":"Theoretical analysis of elastic collapse in metallurgical clad pipes under external pressure","authors":"Mingjie Hu , Haohong Jian , Menglan Duan , Qiwei Wu , Weifeng Zheng","doi":"10.1016/j.marstruc.2025.103861","DOIUrl":"10.1016/j.marstruc.2025.103861","url":null,"abstract":"<div><div>Metallurgical Clad Pipes (MCPs), due to their unique manufacturing process and excellent corrosion resistance, are key equipment for transporting highly corrosive oil and gas in offshore systems. However, the high external hydrostatic pressure in deep-sea environments poses significant risks of collapse, threatening the structural safety of MCPs. In this research, the elastic collapse performance of MCPs under external pressure is investigated by deriving a novel analytical formula based on Donnell shell theory and the Ritz method. The proposed formula considers the perpendicularity of pressure during deformation and is validated through comparisons with the DNV-ST-F101 formula and FEM simulations. The findings demonstrate that the elastic post buckling equilibrium path of MCPs follows the same pattern as that of conventional single-metal pipelines. Moreover, the proposed formula shows improved accuracy and greater applicability to various geometric properties and materials. Research works may provide a theoretical basis to improve the design and safety of MCPs and contribute to the ongoing development of offshore pipeline engineering.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103861"},"PeriodicalIF":4.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlinear dynamic responses of a novel floating semi-submersible wind-solar-aquaculture hybrid system: An experimental study 新型浮式半潜式风-太阳能-水产混合系统的非线性动力响应实验研究

IF 4 2区工程技术

Marine Structures Pub Date : 2025-06-20 DOI: 10.1016/j.marstruc.2025.103881

Sheng Zhang , Xiang Yuan Zheng , Yue Liu , Yucong Jiang , Yu Lei , Xiangyu Zhang , Kehao Qian , Xin Li , Wei Shi

{"title":"Nonlinear dynamic responses of a novel floating semi-submersible wind-solar-aquaculture hybrid system: An experimental study","authors":"Sheng Zhang , Xiang Yuan Zheng , Yue Liu , Yucong Jiang , Yu Lei , Xiangyu Zhang , Kehao Qian , Xin Li , Wei Shi","doi":"10.1016/j.marstruc.2025.103881","DOIUrl":"10.1016/j.marstruc.2025.103881","url":null,"abstract":"<div><div>This paper presents a novel, maintenance-friendly, multifunctional floater that combines a 10 MW floating offshore wind turbine, a fish cage and photovoltaics (FOWT-FCP). To study its multi-body coupling dynamic characteristics under wind and waves, physical model tests of scale 1:30 are carried out in the ocean basin, providing a benchmark for establishing numerical simulations. As the coupling is associated with the nonlinear effect of fish nets, the tests are conducted in two comparative configurations, with and without nets. The dynamic responses of 6 degrees of freedom (DOFs) cage motions, the accelerations at tower top and bottom and cable tensions are collected in regular waves, white noise waves and critical wind-wave load cases. They are comprehensively analyzed in the time and frequency domains. The experimental results show that FOWT-FCP has an excellent seakeeping performance. The dynamic responses in both operational and extreme sea states are well below the code limits. The existence of nets increases not only the 6-DOF motion damping but also the fluid loads, yet from the experimental results, both increases are small. Moreover, the nets reduce the standard deviations and extreme values of responses under rated condition, while enhancing them under survival condition. Therefore, the influence of nets on dynamic responses depends on load conditions. Besides, the responses follow a heavy-tailed non-Gaussian distribution with greater extreme values, and the presence of nets increases the level of non-Gaussianity of responses under survival condition. For almost all measured dynamic responses, their low- and high-frequency components are increased by the wind loads.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103881"},"PeriodicalIF":4.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Long-term validation of a model-based virtual sensing method for fatigue monitoring of offshore wind turbine support structures: Comparing as-designed with state-of-the-art foundation models 基于模型的海上风力发电机支撑结构疲劳监测虚拟感知方法的长期验证：与现有基础模型的比较

IF 4 2区工程技术

Marine Structures Pub Date : 2025-06-20 DOI: 10.1016/j.marstruc.2025.103841

Dominik Fallais , Carlos Sastre Jurado , Wout Weijtjens , Christof Devriendt

{"title":"Long-term validation of a model-based virtual sensing method for fatigue monitoring of offshore wind turbine support structures: Comparing as-designed with state-of-the-art foundation models","authors":"Dominik Fallais , Carlos Sastre Jurado , Wout Weijtjens , Christof Devriendt","doi":"10.1016/j.marstruc.2025.103841","DOIUrl":"10.1016/j.marstruc.2025.103841","url":null,"abstract":"<div><div>Model-based virtual sensing offers a viable approach for monitoring fatigue loads on operational offshore wind turbines. These methods combine response measurements with first-principle, or data-informed models, to estimate load time series at hard-to-access locations. However, their accuracy depends on the fidelity of the underlying model, which is largely influenced by uncertainties in the soil–structure interaction (SSI) models.</div><div>This study evaluates the impact of different SSI modelling approaches in terms of a virtual sensing validation study targeting strain estimation above and below the mudline of a bottom-founded offshore wind turbine. To this end, different numerical models derived from, and validated against, design documentation serve as input to a dual-band modal decomposition and expansion (MDE) method. The considered SSI models range from an API/DNV-based foundation model to a PISA-based model including scour protection. Virtual sensing results are generated for two-year equivalent datasets, obtained for three operational offshore wind turbines, each equipped with extensive load monitoring systems. One turbine is used to assess the effect of the model updates, while two additional turbines are used to assess the across-site consistency. The estimated strains are directly compared against available strain validation data, in terms of damage-equivalent stress, and are accumulated to give a single comparative metric representative for the two-year periods.</div><div>Results show that PISA-based soil reaction curves significantly improve agreement with measured strains while adding a scour protection model has a relatively smaller impact. These findings highlight the importance of accurate foundation modelling in virtual sensing and demonstrate the feasibility of fatigue monitoring at hard-to-access locations.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103841"},"PeriodicalIF":4.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and numerical studies on dynamic performances of the hybrid modular floating structure system 混合模块化浮式结构系统动力性能的实验与数值研究

IF 4 2区工程技术

Marine Structures Pub Date : 2025-06-20 DOI: 10.1016/j.marstruc.2025.103878

Yaqiong Liu , Nianxin Ren , Jinping Ou , Yanwei Li

{"title":"Experimental and numerical studies on dynamic performances of the hybrid modular floating structure system","authors":"Yaqiong Liu , Nianxin Ren , Jinping Ou , Yanwei Li","doi":"10.1016/j.marstruc.2025.103878","DOIUrl":"10.1016/j.marstruc.2025.103878","url":null,"abstract":"<div><div>The present work mainly reports experimental and numerical studies on dynamic performances of the chain-type hybrid multi-module floating structure (HMFS) system under typical wave conditions. For the HMFS system, box-type modules are arranged outermost with functions of floating breakwaters for better anti-wave effect, and semi-sub modules are arranged internally for functions of production and living due to superior hydrodynamic performance. The outermost module is hinged with its adjacent module with an additional Wave Energy Converter (WEC), and semi-sub modules are mutually connected by hinges with torsional stiffness. Numerical analysis has been conducted through ANSYS AQWA based on potential flow theory and structural dynamic method, and scaled physical model tests have been conducted in a wave-current flume laboratory. WECs driven by parallel-shaft gears and hinge connectors with additional linear torsional stiffness are specially designed. The effect of the WEC on the main dynamic performances of the chain-type HMFS system has been studied, and results reveal that it is reasonable and feasible to attach a WEC to the outermost connector for reducing module motion responses and generating wave energy. In addition, the main experimental and numerical results have been compared systematically, which verifies the effectiveness of the coupling dynamic numerical method to a certain extent. Test results of dynamic responses under the survival sea condition demonstrate good motion performance of the system, and the extremum of connector loads can provide an experimental data basis for the design of connectors.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103878"},"PeriodicalIF":4.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seismic fragility and vulnerability assessment of multi-megawatt jacket-supported offshore wind turbines 多兆瓦护套支撑海上风力涡轮机的地震易损性及易损性评估

IF 4 2区工程技术

Marine Structures Pub Date : 2025-06-20 DOI: 10.1016/j.marstruc.2025.103882

Upasana Nath, Sumanta Haldar

{"title":"Seismic fragility and vulnerability assessment of multi-megawatt jacket-supported offshore wind turbines","authors":"Upasana Nath, Sumanta Haldar","doi":"10.1016/j.marstruc.2025.103882","DOIUrl":"10.1016/j.marstruc.2025.103882","url":null,"abstract":"<div><div>Offshore wind turbines (OWTs) are increasingly installed in earthquake-prone regions, thus it is essential to determine the seismic risks associated with these structures. To ensure structural integrity of OWT, seismic fragility and vulnerability needs to be studied to evaluate structural performance and determine earthquake damage risk. This study investigates the seismic risk associated with the multi-megawatt OWTs supported by jacketed foundation. Three-dimensional numerical modelling of jacket, pile, and tower is developed in SAP2000 using non-linear beam elements. The soil-pile interaction is modelled by using American Petroleum Institute (API) based <em>p-y</em> springs. Different damage states were defined for various subsystems of tower, nacelle and substructure to develop the fragility curves of 5, 10, and 15 MW OWTs for near-field and far-field earthquake motions, considering ground motion directionality. The fragility of 15 MW OWTs are more sensitive in case of both near-field and far-field motions. Finally, the vulnerability models of the multi-megawatt OWTs are also developed to evaluate the expected loss of the structures.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103882"},"PeriodicalIF":4.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Behaviour of vertically loaded spudcan foundations under sustained uplift 持续隆升作用下垂直荷载下铲式地基的性能

IF 4 2区工程技术

Marine Structures Pub Date : 2025-06-18 DOI: 10.1016/j.marstruc.2025.103871

Zhen Wang , Jiang Tao Yi , Shi Jie Xu , Shuai Yin , Fei Liu , Yu Tao Pan

{"title":"Behaviour of vertically loaded spudcan foundations under sustained uplift","authors":"Zhen Wang , Jiang Tao Yi , Shi Jie Xu , Shuai Yin , Fei Liu , Yu Tao Pan","doi":"10.1016/j.marstruc.2025.103871","DOIUrl":"10.1016/j.marstruc.2025.103871","url":null,"abstract":"<div><div>Extracting a spudcan foundation in clay is frequently challenging and time-consuming due to the substantial pull-out force needed to overcome the soil breakout resistance. The actual mode of spudcan extraction in the field is that the spudcan is extracted under a constant force provided by the buoyancy of the hull rather than the undrained displacement uplift. This paper investigates the behaviour of the vertically loaded spudcan foundations under sustained uplift through centrifuge experiments and coupled pore fluid-effective stress large deformation finite element simulations. The finding indicates that the threshold sustained load of spudcan failure is approximately 60% of the undrained breakout resistance. When the sustained load is higher than this threshold, the uplift displacement of the spudcan is similar to the soil creep curve, characterised as accelerating at the beginning, then entering a stable stage, and finally tending to accelerate uplift until the spudcan pull-out failure. The failure mechanisms under different uplift modes are also revealed. Under sustained loading, the soil disturbance area increases with the sustained load, gradually manifesting local circulation around the spudcan. Total stress and pore pressure responses lie in the sustained consolidation status under various levels of sustained force.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103871"},"PeriodicalIF":4.0,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sand-coated hybrid FRP tubes for marine applications: Bond performance with seawater-sea sand concrete under seawater 船用涂砂复合玻璃钢管：海水下与海水-海砂混凝土的粘结性能

IF 4 2区工程技术

Marine Structures Pub Date : 2025-06-18 DOI: 10.1016/j.marstruc.2025.103872

Jivan Subedi , Milad Bazli , Shalik Dhungana , Ali Rajabipour , Reza Hassanli , Mehrdad Arashpour

{"title":"Sand-coated hybrid FRP tubes for marine applications: Bond performance with seawater-sea sand concrete under seawater","authors":"Jivan Subedi , Milad Bazli , Shalik Dhungana , Ali Rajabipour , Reza Hassanli , Mehrdad Arashpour","doi":"10.1016/j.marstruc.2025.103872","DOIUrl":"10.1016/j.marstruc.2025.103872","url":null,"abstract":"<div><div>This study investigates the durability of the bond between sand-coated hybrid carbon-glass fibre-reinforced polymer (HFRP) tubes and seawater-sea sand concrete (SWSSC) under simulated marine conditions. Concrete-filled filament-wound HFRP tubes were immersed in seawater at temperatures of 25 °C, 40 °C, and 60 °C for durations of 30, 90, and 120 days. Push-out tests were conducted to evaluate the bond performance of the concrete-filled FRP tubes (CFFTs), focusing on failure modes, bond strength, and bond-slip characteristics. Results revealed an initial enhancement in bond strength for all conditioned samples after 30 days compared to unconditioned references, followed by a gradual decline, culminating in a maximum bond strength reduction of 9 % after 120 days. The primary failure mode for conditioned specimens occurred at the interface between the HFRP tube and the sand-coated layer, while unconditioned specimens failed at the interface of the tube and the concrete. The study found that post-peak bond behaviour varied, with bond strength either maintained or gradually reduced, mainly due to the loss of chemical adhesion and friction. Using the fib Bulletin 40 approach, a knock-down factor of 0.5 is recommended for bond strength durability over a 50-year service life in seawater environments. This research stresses the potential of sand-coated HFRP tubes and SWSSC as sustainable, marine-compatible construction materials that meet structural durability requirements.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103872"},"PeriodicalIF":4.0,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of mooring system for floating wind turbine based on macro-model of chain-seabed interaction 基于链-海床相互作用宏观模型的浮式风力机系泊系统分析

IF 4 2区工程技术

Marine Structures Pub Date : 2025-06-14 DOI: 10.1016/j.marstruc.2025.103877

Shengjie Rui , Hans Petter Jostad , Zefeng Zhou , Erin Bachynski-Polić , Svein Sævik , Lizhong Wang , Zhen Guo

{"title":"Analysis of mooring system for floating wind turbine based on macro-model of chain-seabed interaction","authors":"Shengjie Rui , Hans Petter Jostad , Zefeng Zhou , Erin Bachynski-Polić , Svein Sævik , Lizhong Wang , Zhen Guo","doi":"10.1016/j.marstruc.2025.103877","DOIUrl":"10.1016/j.marstruc.2025.103877","url":null,"abstract":"<div><div>Traditional fully integrated analyses of floating wind turbines (FTWs) assume a fixed mooring point on the seabed, overlooking the effects of the embedded mooring line within the seabed. This simplification introduces inconsistency and uncertainty in mooring system design. In this study, a macro-model was proposed to simulate the interaction between the mooring line and seabed soil, and it was implemented into SIMA (a fully coupled aero-hydro-servo-elastic engineering tool). The macro-model captures the coupled non-linear relationship between incremental displacement and resultant soil reaction force in three-dimensional space. After verifying the model, effects of seabed friction and embedded chain on the mooring line were evaluated. Subsequently, mooring analyses of the VolturnUS-S floater supporting the IEA 15MW floating wind turbine were performed using the macro-model to assess key parameters in mooring line design. Then, three representative cases under dynamic conditions are designed to investigate the influence of the embedded line on mooring system response. The study demonstrated that the macro-model of chain-seabed interaction effectively captures the response of the mooring chain considering gradual mobilization of soil reaction forces and effective width parameters due to the chain geometry. Without modelling the embedded line, mooring lines have larger tension due to smaller displacement near the padeye on the seabed, emphasizing the importance of embedded line on seabed friction mobilization under both static and dynamic conditions. The seabed friction shares the load transferred from the floater, and significantly affects the anchor load. This study develops a crucial tool for mooring design of floating wind turbines considering the embedded chain.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103877"},"PeriodicalIF":4.0,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0