Ocean Engineering最新文献_第5页

Experimental investigation on the ultimate strength of cracked unstiffened and stiffened plates under cyclic loading 循环荷载作用下开裂加筋与未加筋板极限强度的试验研究

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-10-09 DOI: 10.1016/j.oceaneng.2025.123117

Kang Hu , Youcheng Wang , Ziya Peng , Huwei Cui , Qingchao Liu

{"title":"Experimental investigation on the ultimate strength of cracked unstiffened and stiffened plates under cyclic loading","authors":"Kang Hu , Youcheng Wang , Ziya Peng , Huwei Cui , Qingchao Liu","doi":"10.1016/j.oceaneng.2025.123117","DOIUrl":"10.1016/j.oceaneng.2025.123117","url":null,"abstract":"<div><div>The aim of this paper is to investigate the ultimate collapse behavior of ship structures under cyclic loading. To this end, experimental investigations were conducted to explore the ultimate strength reduction of hull unstiffened and stiffened plates considering the fatigue crack propagation and cumulative plasticity simultaneously. Twenty-one specimens including eleven unstiffened plate specimens and ten stiffened plate specimens were designed and fabricated with the same initial crack length, and a set of test devices was ingeniously designed for evaluating the ultimate strength under cyclic loading. Different loading conditions were applied by varying the cyclic loading magnitudes and crack propagation lengths to make clear the relationship between the crack lengths on the stiffener and on the plate. The prediction formulas were derived to estimate the ultimate strength values of cracked unstiffened and stiffened plates under cyclic loading; the accuracy of the prediction formulas was validated by comparing them with the experimental and numerical results. It helps to further explore the ultimate collapse behavior of cracked ship structures in harsh sea condition.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 123117"},"PeriodicalIF":5.5,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269289","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

Triboelectric nanogenerator based on pile-type oscillating float structure for wave energy harvesting 基于桩式振荡浮子结构的纳米摩擦发电机波浪能收集

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-10-08 DOI: 10.1016/j.oceaneng.2025.123083

Nan Pang , Ming Liu , Ming Ju , Lan Zhang , Zhong Liu , Zhonggang Xiong , Huaguo Liu , Lingquan Kong

{"title":"Triboelectric nanogenerator based on pile-type oscillating float structure for wave energy harvesting","authors":"Nan Pang , Ming Liu , Ming Ju , Lan Zhang , Zhong Liu , Zhonggang Xiong , Huaguo Liu , Lingquan Kong","doi":"10.1016/j.oceaneng.2025.123083","DOIUrl":"10.1016/j.oceaneng.2025.123083","url":null,"abstract":"<div><div>The surging ocean waves contain enormous energy and are one of the most promising renewable energy sources. In order to enhance the motion response of the triboelectric nanogenerator in a wave environment, the paper proposes a triboelectric nanogenerator based on a pile-type oscillating float structure for collecting wave energy, so that it can be installed on steel piles on offshore platforms to provide a steady power supply. Due to the movement of the float and the waves, the contact of the independent layer power generation structure of the grid electrode is insufficient. To solve the problem, the study adopts the electrode form with a spring elastic support structure, which significantly improves the wave energy collection capacity. The OF-TENG experiment provides a peak rectified short-circuit current of 35.88 μA, a peak power of 5.02 mW, and an average power of 1.724 mW. At the same time, in the water flume wave simulation experiment, the 1 mF capacitor was charged to 5V within 546.64s, successfully realizing the data transmission of the temperature and humidity sensor and powering the marine navigation indicator light, verifying the feasibility and practicality of the device as a power source. The study provides a practical approach for efficient wave energy harvesting and multifunctional applications.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 123083"},"PeriodicalIF":5.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269170","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

Fatigue life assessment of nylon versus polyester mooring lines 尼龙与聚酯系缆的疲劳寿命评估

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-10-08 DOI: 10.1016/j.oceaneng.2025.123021

Samer Saleh , Richard Akers , Krish Thiagarajan Sharman , Malakonda Reddy Lekkala , Bonjun Koo

{"title":"Fatigue life assessment of nylon versus polyester mooring lines","authors":"Samer Saleh , Richard Akers , Krish Thiagarajan Sharman , Malakonda Reddy Lekkala , Bonjun Koo","doi":"10.1016/j.oceaneng.2025.123021","DOIUrl":"10.1016/j.oceaneng.2025.123021","url":null,"abstract":"<div><div>Mooring systems are essential for station keeping of floating offshore structures under environmental loads. Synthetic fiber ropes such as polyester and nylon are considered strong candidates for mooring systems in both deep and shallow waters due to their low cost, corrosion resistance, and low stiffness. Accordingly, predicting their fatigue damage has become an important area of research. This study evaluates the fatigue performance of two mooring systems: chain-nylon-chain and chain-polyester-chain, for a semi-submersible floating offshore wind turbine in shallow water. Following industry guidance from the American Bureau of Shipping, two different stiffness values were used for polyester and nylon: a “Static EA” for static simulations and a “Dynamic EA” for dynamic simulations. To achieve comparable performance, adjustments to mooring line lengths, diameters, and anchor positions were made to reflect their differing mechanical properties. Sixty-six sets of loading conditions representing DLC 1.2, DLC 6.1, and SLC I.1 were simulated. Fatigue analysis was conducted by post-processing the tension time histories to extract stress cycles via the Rainflow counting method, followed by fatigue life estimation using Palmgren-Miner's cumulative damage rule. To validate this approach, a parallel fatigue analysis was conducted using the built-in fatigue toolbox in the commercial software OrcaFlex. The comparison between the two methods showed strong agreement, with a maximum percentage difference of approximately 1.38 %. Results indicate that nylon mooring lines offer superior fatigue life compared to polyester, with the platform–chain segment in the nylon configuration also showing significantly enhanced durability.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 123021"},"PeriodicalIF":5.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268725","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

Variability and extremes of the Caspian Sea's modelled wave climate 里海模拟波浪气候的变异性和极端

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-10-08 DOI: 10.1016/j.oceaneng.2025.123077

Andrea Giudici , Rain Männikus , Tarmo Soomere

{"title":"Variability and extremes of the Caspian Sea's modelled wave climate","authors":"Andrea Giudici , Rain Männikus , Tarmo Soomere","doi":"10.1016/j.oceaneng.2025.123077","DOIUrl":"10.1016/j.oceaneng.2025.123077","url":null,"abstract":"<div><div>The wave climate of the Caspian Sea has been notably underrepresented in the existing literature, leaving an important gap in the understanding of wave extremes. We address this deficiency by generating a high-resolution, idealized ice-free wave hindcast dataset for the Caspian Sea, covering 42 years (1982–2023) using the third-generation SWAN model driven by ERA5 winds. The simulated wave properties are calibrated and validated against previous lower-resolution simulations and satellite altimetry data from Copernicus Marine Service's multi-mission products. The model is run using 3-monthly average water level. The comparison by means of dynamic time warping and wavelet coherence analysis confirmed overall consistency of our simulations with earlier simulations but revealed different timing of some modelled events. The wave climate of the Caspian Sea is generally mild, with extensive spatial and seasonal variation. The mean significant wave height (<span><math><mrow><msub><mi>H</mi><mi>S</mi></msub></mrow></math></span>) is around 1 m in most of the sea, but certain storms can produce <span><math><mrow><msub><mi>H</mi><mi>S</mi></msub></mrow></math></span> up to 6–7 m. Extreme wave heights tend to occur in areas where average wave heights are moderate, particularly near the eastern shores of the central and northern part of the basin, and near the western shores in the southern part. The probability distribution of wave heights is best represented by a Wald (inverse Gaussian) model, whereas its upper tail is more suitably fitted by a Weibull distribution. The enhanced understanding of the Caspian Sea's wave dynamics, including analysis of the properties and location of severe waves in a selection of extreme storms, provides a robust foundation for informing coastal management strategies and mitigating the impact of extreme wave events.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 123077"},"PeriodicalIF":5.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269165","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

Surrogate-based limit state modeling for reliability analysis of stationary marine operations 舰船固定作业可靠性分析的基于代理的极限状态模型

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-10-08 DOI: 10.1016/j.oceaneng.2025.122985

Wilson Guachamin-Acero , Héctor Salazar-Fonseca , Jonathan Castro-Revelo

{"title":"Surrogate-based limit state modeling for reliability analysis of stationary marine operations","authors":"Wilson Guachamin-Acero , Héctor Salazar-Fonseca , Jonathan Castro-Revelo","doi":"10.1016/j.oceaneng.2025.122985","DOIUrl":"10.1016/j.oceaneng.2025.122985","url":null,"abstract":"<div><div>Safe execution of marine operations (MOs), such as lowering a jackup leg, depends on its reliability. Given the stochastic nature of dynamic responses, the randomness of actual operational limits, and practical information available onboard, e.g., roll, pitch, and heave Root Mean Squared (RMS) values. This paper introduces a simple but robust method for reliability analysis of an MO using a surrogate limit state equation. For a location in the North Sea, 37 years of hindcast directional wave spectra are used to compute the covariances of the roll, pitch, heave, and leg impact velocity of a jackup barge. The covariances are input into a Differential Evolution Optimization Algorithm to optimize a variance-based model and find the coefficients of a surrogate limit state equation, whose performance is the best for the month- and season-based models. Reliability indexes are calculated using the First Order Reliability Method, and are used to find workable weather windows for a single-leg and the complete four-leg lowering operation. The operator can assess the probability of failure of the entire leg lowering process by simply using RMS values of the jackup motions. The method is practical, efficient, robust, and can be used to develop alternative real-time onboard decision-making systems.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 122985"},"PeriodicalIF":5.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269086","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

Jacobi–Ritz method for free vibration analysis of medium-thickness sandwich cylindrical shells utilizing the layerwise theory and domain decomposition method 利用分层理论和区域分解方法对中厚夹层圆柱壳进行自由振动分析的Jacobi-Ritz方法

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-10-08 DOI: 10.1016/j.oceaneng.2025.123065

Xinyang Zhao , Shuo Wang , Zhiyuan Mei, Shuyue An, Zhan Zhang

{"title":"Jacobi–Ritz method for free vibration analysis of medium-thickness sandwich cylindrical shells utilizing the layerwise theory and domain decomposition method","authors":"Xinyang Zhao , Shuo Wang , Zhiyuan Mei, Shuyue An, Zhan Zhang","doi":"10.1016/j.oceaneng.2025.123065","DOIUrl":"10.1016/j.oceaneng.2025.123065","url":null,"abstract":"<div><div>This study establishes the core theoretical foundation by coupling the Layerwise Theory (LWT) and First-Order Shear Deformation Theory (FSDT). Then, the Jacobi-Ritz method and Domain Decomposition Method (DDM) are integrated into this foundation to construct a four-layer synergistic coupled analysis framework. This framework solves the technical challenges in vibration analysis of medium-thickness sandwich cylindrical shells (with a thickness-to-radius ratio <span><math><mrow><mi>h</mi><mo>/</mo><mi>R</mi><mo>=</mo><mn>0.05</mn><mo>−</mo><mn>0.2</mn></mrow></math></span>). Exclusive DDM connection energy formulas and matrices are derived to adapt to the LWT-FSDT framework, ensuring interlayer displacement continuity and mechanical consistency between subdomains. Global displacement functions are constructed within this framework using Jacobi polynomials. Moreover, the cylindrical shell is discretized into subdomains connected by virtual springs via DDM. This design suppresses high-order oscillations in non-segmented models, reduces the sensitivity of Jacobi parameters by two orders of magnitude, and eliminates the need for complex parameter optimization. According to the numerical result validation, when the core material modulus is ≥ 100 MPa, the maximum error between the theoretical results and finite element method (FEM) results is ≤ 2.16 %. The framework accurately captures the interfacial behavior of heterogeneous materials (with an error of 1.34 %) and quantifies its applicable boundary (the error is approximately 10 % when the core modulus is 10 MPa). Lastly, the proposed framework provides a robust and efficient analytical tool for the engineering design of medium-thickness sandwich cylindrical shells, especially those with heterogeneous material configurations.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 123065"},"PeriodicalIF":5.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269154","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

Vibration-based Bayesian updating of hull girder finite element models 基于振动的船体梁有限元模型贝叶斯更新

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-10-08 DOI: 10.1016/j.oceaneng.2025.123068

Nicholas E. Silionis , Sotiris Panagiotopoulos , Palle Andersen , Johan Sandström , Georgia Psoni , Konstantinos N. Anyfantis

{"title":"Vibration-based Bayesian updating of hull girder finite element models","authors":"Nicholas E. Silionis , Sotiris Panagiotopoulos , Palle Andersen , Johan Sandström , Georgia Psoni , Konstantinos N. Anyfantis","doi":"10.1016/j.oceaneng.2025.123068","DOIUrl":"10.1016/j.oceaneng.2025.123068","url":null,"abstract":"<div><div>Recent advances in sensing technology and data processing have enabled using structural response data collected in situ to identify typically unmeasurable quantities of interest governing the response characteristics of complex structural systems. These updated quantities can then be used to identify incipient structural damage or to improve the predictive accuracy of engineering models simulating structural response, thereby enhancing structural operation and management capabilities. The present study applies the principles of Bayesian model updating to identify equivalent stiffness properties of a high-fidelity Finite Element model of a real-world coast guard vessel, using vibrational measurements collected from the actual vessel. Initially, the parameter space of the high-fidelity Finite Element model is reduced heuristically to derive equivalent stiffness-related parameters. Subsequently, these equivalent parameters are updated so that the predicted modal frequencies match those obtained through Operational Modal Analysis performed using acceleration signals measured on the vessel. Parameter updating is performed via Bayesian inference. The influence of different modal information on inference and identifiability is explored and the potential of using the Bayesian posterior predictive distribution for damage identification is discussed.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 123068"},"PeriodicalIF":5.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269157","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

Numerical investigation of wave force on two closely spaced bridges subjected to stokes wave 斯托克斯波作用下两座紧密间隔桥梁波浪力的数值研究

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-10-08 DOI: 10.1016/j.oceaneng.2025.123022

Quansheng Yan, Xianyun Li, Buyu Jia, Xiaolin Yu, Yufan Luo

{"title":"Numerical investigation of wave force on two closely spaced bridges subjected to stokes wave","authors":"Quansheng Yan, Xianyun Li, Buyu Jia, Xiaolin Yu, Yufan Luo","doi":"10.1016/j.oceaneng.2025.123022","DOIUrl":"10.1016/j.oceaneng.2025.123022","url":null,"abstract":"<div><div>In recent years, coastal transportation infrastructure has entered a phase of rapid development. However, frequent extreme storm surges and tsunami waves pose significant threats to the structural safety of coastal bridges. This study investigates wave force acting on two closely spaced box-girder bridge decks under second-order Stokes wave conditions. A two-dimensional numerical wave flume was developed using Computational Fluid Dynamics (CFD) methods, incorporating second-order Stokes wave theory for wave generation. The model’s accuracy was validated through comparison with experimental results. Key findings include: (1) Significant differences in wave-induced force are observed between two closely spaced box-girder bridges and solo deck configurations, mainly due to wave reflection and flow entrapment between decks; (2) Hydrodynamic parameters such as submergence coefficient, wave height, deck spacing, and wave period exhibit differing effects on the wave-ward and leeward bridge decks; (3) After full submergence and with higher wave heights, the peak counteracting horizontal force (the force acting opposite to the wave propagation direction) is more likely to surpass the peak forward force; (4) Inclined web configurations are effective in reducing horizontal wave impacts compared to vertical webs, though they induce greater vertical loads. These insights provide a theoretical reference for the hydrodynamic design and safety evaluation of coastal bridges under extreme wave conditions. In particular, the distinct differences in wave force responses between two closely spaced and solo box-girder configurations deserve further engineering attention in marine bridge applications.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 123022"},"PeriodicalIF":5.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269158","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

Considerations on the superposition method’s applicability to pile group impedance functions for offshore wind turbine foundations 海上风电基础群桩阻抗函数叠加法适用性的思考

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-10-08 DOI: 10.1016/j.oceaneng.2025.123029

Eduardo Rodríguez-Galván, Guillermo M Álamo, Juan J Aznárez, Orlando Maeso

{"title":"Considerations on the superposition method’s applicability to pile group impedance functions for offshore wind turbine foundations","authors":"Eduardo Rodríguez-Galván, Guillermo M Álamo, Juan J Aznárez, Orlando Maeso","doi":"10.1016/j.oceaneng.2025.123029","DOIUrl":"10.1016/j.oceaneng.2025.123029","url":null,"abstract":"<div><div>The modelling of pile-soil-pile interaction using the superposition method is studied. For this purpose, a general matrix-based formulation is implemented, explicitly incorporating all flexibility components of the problem: horizontal, rocking, vertical, and their coupled terms. This model is employed to: (1) investigate the impact of each individual flexibility terms, by selectively removing them within the global formulation, on the horizontal, rocking, and cross-coupled impedances functions; and (2) evaluate the method’s applicability to polygonal pile group configurations, representative of those used in jacket-supported offshore wind turbines. A previously developed continuum model has been used as a benchmark for validation. Results show that the horizontal, cross-coupled and rocking dynamic impedances for regular pile groups are accurately reproduced through the superposition method. It is revealed that the horizontal impedances are correctly estimated when the terms related to vertical behaviour are neglected, by only considering the horizontal and rocking flexibilities. The rocking impedances are mainly influenced by the vertical component, although the flexibility terms related to the vertical-lateral coupling can be disregarded. However, to correctly reproduce the group cross-coupled impedances, all vertical, horizontal, rocking, and their coupling flexibility terms must be considered.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 123029"},"PeriodicalIF":5.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269161","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

Surrogate-based global sensitivity analysis of a floating fish cage array with shared mooring 基于代理的共享系泊浮网箱阵列全局灵敏度分析

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-10-08 DOI: 10.1016/j.oceaneng.2025.122993

Yu Ma , Zhiyu Jiang , Muk Chen Ong , Lin Li

{"title":"Surrogate-based global sensitivity analysis of a floating fish cage array with shared mooring","authors":"Yu Ma , Zhiyu Jiang , Muk Chen Ong , Lin Li","doi":"10.1016/j.oceaneng.2025.122993","DOIUrl":"10.1016/j.oceaneng.2025.122993","url":null,"abstract":"<div><div>The deployment of large steel-framed cages for salmon farming has yielded successful trial harvests offshore. Following this technologic trend, an innovative shared-mooring solution is proposed in this study to accommodate multiple semi-submersible cages within a single array for cost-effective harvesting. However, directional ocean currents during harvesting seasons can induce excessive horizontal displacements of the fish cages, posing risks to critical infrastructure, such as import power cables or refill pipes. This study introduces an interpretable surrogate-based Sobol global sensitivity analysis (GSA) framework to identify both critical mooring design variables and worst-case current headings. The surrogate GSA framework is built upon a simplified numerical scheme, employing catenary equations to efficiently calculate the mooring forces at 23 mooring lines. Drag forces at both the hull and nettings of each fish cage structure are also accounted for. Using the training data generated from the numerical model, Kriging surrogates are constructed for fish-cage offset prediction. Approximately 95 % accuracy and an 80-fold improvement in efficiency are achieved compared to direct full simulations. The computed Sobol indices identify the current directions that lead to significant displacements across all possible mooring configurations. Further interpretation of the indices reveals that increasing mooring line diameters offers the most effective stiffness gains. These insights inform design recommendations for both array orientation and local reinforcements. The proposed surrogate based Sobol GSA framework thus enables fast and interpretable assessment for design of offshore shared-mooring systems.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 122993"},"PeriodicalIF":5.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145269155","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