Ocean Engineering最新文献

Optimal channel management model for mixed traffic flow with automated and human-operated ships in seaports 港口船舶自动化与人工混合交通流的最优航道管理模型

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-16 DOI: 10.1016/j.oceaneng.2025.122177

Xinyu Zhang , Wenqiang Guo , Jingyun Wang , Haining Qian

{"title":"Optimal channel management model for mixed traffic flow with automated and human-operated ships in seaports","authors":"Xinyu Zhang , Wenqiang Guo , Jingyun Wang , Haining Qian","doi":"10.1016/j.oceaneng.2025.122177","DOIUrl":"10.1016/j.oceaneng.2025.122177","url":null,"abstract":"<div><div>The coexistence of autonomous ships (ASs) and human-operated ships (HSs) will persist in seaport traffic systems for the foreseeable future. To improve traffic efficiency in such mixed environments, it is essential to make efficient use of limited channel resources. To address this issue, this paper develops an optimization model for channel management. Three channel navigation strategies are introduced: dedicated channels for ASs (DC-AS), dedicated channels for HSs (DC-HS), and mixed channels (MC). A macroscopic traffic capacity model of different channel navigation strategies is established by incorporating heterogeneous ship-following modes and ASs platooning characteristics. Based on this, an optimization model for channel management is formulated to maximize total channel traffic capacity under constraints of traffic demand, flow distribution balance, and fairness. Numerical experiments are conducted to verify the effectiveness of the model. Results indicate that: (1) penetration rate of ASs improves capacity, especially when a critical threshold is exceeded; (2) larger platoon sizes lead to higher capacity gains under congested conditions; (3) the optimal navigation strategy shifts from MC to DC-AS as ASs penetration rate increases. This study provides a theoretical framework for efficient channel management in future mixed maritime traffic scenarios.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122177"},"PeriodicalIF":4.6,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633142","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

Rotational speed prediction for rated power operation of a horizontal axis tidal turbine under surging motion conditions 脉动工况下水平轴潮汐水轮机额定功率运行转速预测

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-16 DOI: 10.1016/j.oceaneng.2025.122206

Shuqi Wang , Jinji Xiao , Siyuan Chen , Renwei Ji , Kai Wang

{"title":"Rotational speed prediction for rated power operation of a horizontal axis tidal turbine under surging motion conditions","authors":"Shuqi Wang , Jinji Xiao , Siyuan Chen , Renwei Ji , Kai Wang","doi":"10.1016/j.oceaneng.2025.122206","DOIUrl":"10.1016/j.oceaneng.2025.122206","url":null,"abstract":"<div><div>Under actual sea conditions, a floating horizontal-axis tidal power device (FHATPD) will experience a six-degree-of-freedom (6-DOF) wave-induced motion response, resulting in a change in the relative inflow velocity to the horizontal-axis tidal turbine (HATT). If the HATT maintains a constant rotational velocity, its hydrodynamic loads will fluctuate with the 6-DOF motion of the supporting structure. Consequently, to ensure the stable and safe operation of the FHATPD, the rotational speed of the HATT can be controlled. The purpose of rotational speed control is to enable the HATT to operate at its stated power rating. First, the power coefficient is calculated for different tip speed ratios using the established computational fluid dynamics (CFD) method for the surging motion and variable-speed rotation of the HATT. Subsequently, a rotational speed prediction model is established based on a multilayer perceptron (MLP), and the prediction results are verified by a CFD-based method. The training of the MLP model is improved by adjusting the feature parameters, supplementing the training data, and smoothing the mutation curves. Finally, the rotational speed prediction model of the HATT operating at rated power is obtained. These results can be a valuable reference for the FHATPD's operational stability and efficiency.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122206"},"PeriodicalIF":4.6,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633139","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 analyses on the failure of composite cylinders with a novel conformal reinforcement structure 新型保形配筋结构复合材料圆柱体破坏试验与数值分析

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-16 DOI: 10.1016/j.oceaneng.2025.122149

Ruixuan Hu , Xinhu Zhang , Yangrenyan Li , Xin Wang , Chengchun Yong , Guang Pan

引用次数: 0

Evaluating the role of draghead positioning in dredging performance using 3D CFD, mud sampling, and rheometry 利用三维CFD、泥浆取样和流变法评估拖曳头定位在疏浚性能中的作用

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-16 DOI: 10.1016/j.oceaneng.2025.122117

S. Haeri , N. Berry , J. Spearman , D. Longo , J. Taylor , N. Feates

{"title":"Evaluating the role of draghead positioning in dredging performance using 3D CFD, mud sampling, and rheometry","authors":"S. Haeri , N. Berry , J. Spearman , D. Longo , J. Taylor , N. Feates","doi":"10.1016/j.oceaneng.2025.122117","DOIUrl":"10.1016/j.oceaneng.2025.122117","url":null,"abstract":"<div><div>This paper presents a framework for the modelling of dredging operations, by developing high-fidelity CFD simulations and recognising the highly complex rheology of mud. The goal is to understand the impact of draghead position on the dredging efficiency. The mud sampling procedure is described, followed by a detailed account of the rheometry experiments, rheological modelling, and statistical data reduction methods. In this work mud samples are obtained from 5 different locations for up to 4 different depths in Harwich Harbour in the United Kingdom. Various analyses are performed including analysis of constituents (sand, silt and organic matter) and bulk density. Rheometry tests are performed and after examining the existing empirical models a dual Bingham and Herschel-Bulkley model was chosen which fits the data well and accurately captures the observed mud’s flow behaviour. In addition, the dual Bingham and Herschel-Bulkley model is implemented in the OpenFOAM open-source CFD framework and thoroughly validated by simulating the rheometer cell and comparing the calculated torque directly with the experimental data. Then, large-scale CFD simulations are performed to investigate the flux of different mud layers as a function of the draghead operating depth, employing the dual Bingham and Herschel-Bulkley model. The assessment of various dredging strategies based on draghead depth is presented through analysis of CFD mud layer suction flux data for a stationary draghead. Based on these results, recommendations are made regarding the optimal operating depth relative to different mud layers, considering both economic and environmental factors, including fuel consumption.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122117"},"PeriodicalIF":4.6,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633171","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

Research on dynamic characteristics of a tension-leg modular floating structure system under tendon failure 张力腿模块化浮式结构系统在肌腱破坏下的动力特性研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-16 DOI: 10.1016/j.oceaneng.2025.122184

Yanwei Li , Conghao Qian , Nianxin Ren , Jun Yan , Zhe Zhang , Jinping Ou

{"title":"Research on dynamic characteristics of a tension-leg modular floating structure system under tendon failure","authors":"Yanwei Li , Conghao Qian , Nianxin Ren , Jun Yan , Zhe Zhang , Jinping Ou","doi":"10.1016/j.oceaneng.2025.122184","DOIUrl":"10.1016/j.oceaneng.2025.122184","url":null,"abstract":"<div><div>Tension-leg modular floating structures (MFS) offer a promising solution for scalable ocean space utilization. However, these platforms may face potential tendon failure during operation, which can lead to severe instability. In this paper, a numerical framework is established to investigate the dynamic characteristics of a tension-leg modular floating structure system under tendon failure, using the ANSYS-AQWA user_force subroutine written in Fortran. Based on this foundation, a systematic analysis was conducted to examine the effects of single tendon failure and progressive tendon failures on motion responses, residual tendon loads, and connector loads under still water, regular waves, and irregular waves. The results indicate that tendon failure leads to adjustments in the modules' attitude and oscillations around a new equilibrium position, while its impact on the overall motion response remains relatively limited. Following the tendon failure, the residual tendon loads of the affected module increase significantly, and the connector loads between the affected and adjacent tension-leg modules are also considerably amplified. Due to the mechanical coupling effect of the connectors, the effect of tendon failure gradually propagates to other modules, causing minor transient responses and redistribution of tendon loads throughout the system, though the overall impact remains relatively small. In addition, an active ballast tank control strategy is proposed, which injects ballast water at the failed tendon location to adjust the module attitude and effectively mitigate the adverse dynamic responses caused by tendon failure. The results of this work provide valuable references for the design, operation, and failure prevention of tension-leg modular floating structures.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122184"},"PeriodicalIF":4.6,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633172","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

Prediction of shoreline wave setup on beaches using artificial neural networks 利用人工神经网络预测海滩岸线波浪设置

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-16 DOI: 10.1016/j.oceaneng.2025.121863

Chao Ji , Qi Jiang , Dianguang Ma , Kun Chen , Xuefang Li , Jianmin Xiao , Jing Lu , Qinghe Zhang

{"title":"Prediction of shoreline wave setup on beaches using artificial neural networks","authors":"Chao Ji , Qi Jiang , Dianguang Ma , Kun Chen , Xuefang Li , Jianmin Xiao , Jing Lu , Qinghe Zhang","doi":"10.1016/j.oceaneng.2025.121863","DOIUrl":"10.1016/j.oceaneng.2025.121863","url":null,"abstract":"<div><div>This study explores the application of artificial neural networks (ANNs) for predicting shoreline wave setup, a critical parameter in coastal flood risk assessment and infrastructure design. A dataset comprising 772 field observations, the largest dataset available for shoreline wave setup prediction, was used to train, validate and test two distinct models. ANN model 1 incorporates the deep-water wave height, deep-water wavelength and beach foreshore slope as input variables. ANN model 2 includes these variables as well as the median grain size. Both models were developed by using feedforward architectures, with training performed through backpropagation and hyperparameters optimized via the Optuna framework. The results demonstrate that the ANN models significantly outperform traditional empirical formulas in terms of predictive accuracy and generalizability. Further analysis reveals that the models perform robustly across different beach states, with particularly notable advantages for intermediate and reflective beaches. The incorporation of the median grain size as an input variable enhances the model performance across all sediment types, with substantial gains observed on medium to coarse sand beaches. Overall, this study offers reliable tools for shoreline wave setup prediction, thus contributing to coastal management and engineering applications.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 121863"},"PeriodicalIF":4.6,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633173","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 study on the dynamic responses of a segmental submerged floating tunnel model under the coupled action of waves currents, and earthquakes 波浪与地震耦合作用下分段沉浮隧道动力响应试验研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-16 DOI: 10.1016/j.oceaneng.2025.122178

Xiuwen Yuan , Jiabin Liu , Jialei Yan , Anxin Guo

引用次数: 0

Modelling out-of-plane hydrodynamic hysteresis in horizontal submarine maneuvers with indicial responses 具有指示响应的水平潜艇机动面外水动力滞回建模

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-16 DOI: 10.1016/j.oceaneng.2025.122143

C.J. Marshall , T.L. Jeans , A.G. Gerber , R.A. Doyle

{"title":"Modelling out-of-plane hydrodynamic hysteresis in horizontal submarine maneuvers with indicial responses","authors":"C.J. Marshall , T.L. Jeans , A.G. Gerber , R.A. Doyle","doi":"10.1016/j.oceaneng.2025.122143","DOIUrl":"10.1016/j.oceaneng.2025.122143","url":null,"abstract":"<div><div>Predicting the transient hydrodynamic loads in submarine maneuvering simulations has traditionally been limited to quasi-steady modelling assumptions which are not well-founded in extreme maneuvering scenarios. Recent studies have shown that the time-history of the wake is significant for the out-of-plane hydrodynamics of a submarine in horizontal maneuvers. Despite efforts of modelling these effects with integral-type impulse response methods, known within the vehicle dynamics community as indicial theory, the complex separation and development of the wake surrounding the hull causes significant modelling errors in high frequency oscillation maneuvers. This study investigates characteristics of the time-domain hydrodynamic response of an SSK-class submarine, and a corresponding reduced-order model implementation. Model predictions for a set of small and large amplitude drift oscillation maneuvers are used to demonstrate the shortcomings of the current model formulation. A revised model designed to modify the high-frequency response of the vehicle is shown to significantly improve the qualitative and quantitative performances of the model in large amplitude oscillations.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122143"},"PeriodicalIF":4.6,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633145","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 study on power generation characteristics of a built-in bistable mechanism wave energy converter with broadband capturing performance 具有宽带捕获性能的内置双稳机构波能转换器发电特性的实验研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-16 DOI: 10.1016/j.oceaneng.2025.122126

Shaoshi Dai , Yuanchao Chai , Hengxu Liu , Weiyou Yi , Fujiang Lyu , Hailong Chen

{"title":"Experimental study on power generation characteristics of a built-in bistable mechanism wave energy converter with broadband capturing performance","authors":"Shaoshi Dai , Yuanchao Chai , Hengxu Liu , Weiyou Yi , Fujiang Lyu , Hailong Chen","doi":"10.1016/j.oceaneng.2025.122126","DOIUrl":"10.1016/j.oceaneng.2025.122126","url":null,"abstract":"<div><div>Wave energy, as a continuous and reliable power source, has attracted significant attention for powering offshore marine buoys. However, its effective utilization is affected by varying incident wave frequencies, which compromises the overall power generation performance of traditional wave energy converters (WECs). Therefore, a built-in WEC based on a bistable mechanism (BM-WEC) with broadband capture characteristics is proposed to accommodate temporal and spatial fluctuations of waves. The power generation performances were analyzed through numerical simulations and physical experiments, revealing the effects of structural parameters and step changes in spring stiffness and damping coefficient on motion response and electrical output, developing an optimization process to enhance high-power output. Results show that the BM-WEC achieves a captured bandwidth 13.47 % wider than that of a conventional WEC with a single natural frequency under regular wave conditions (<em>ω</em> = 1–4 rad/s), with cumulative output power increased by 57.24 %. Furthermore, this bandwidth advantage increases to 19.05 % under irregular wave condition, demonstrating that it is a practical and feasible solution for self-powered buoy technology.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122126"},"PeriodicalIF":4.6,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633146","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

Dynamic performance analysis of floating offshore wind turbines integrated with oscillating water columns matrix 结合振荡水柱矩阵的海上浮式风力机动力性能分析

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-07-16 DOI: 10.1016/j.oceaneng.2025.122128

Tahereh Bagheri-Rouch , Payam Aboutalebi , Aitor J. Garrido , Izaskun Garrido

{"title":"Dynamic performance analysis of floating offshore wind turbines integrated with oscillating water columns matrix","authors":"Tahereh Bagheri-Rouch , Payam Aboutalebi , Aitor J. Garrido , Izaskun Garrido","doi":"10.1016/j.oceaneng.2025.122128","DOIUrl":"10.1016/j.oceaneng.2025.122128","url":null,"abstract":"<div><div>Floating Offshore Wind Turbines (FOWTs) are prone to undesirable wave-induced motions, which can impact their efficiency and structural integrity. This study proposes a novel rectangular barge platform that mitigates these oscillations by integrating Oscillating Water Columns (OWCs) matrix within the structure. While an active control strategy has not been implemented, the adjustable OWCs matrix introduces the potential for active tuning, allowing the platform to avoid natural frequencies by switching between open and closed configurations. The platform’s dynamic behavior is analyzed using the Response Amplitude Operator (RAO) to predict its response to various wave frequencies. Performance evaluations based on RAO analysis and numerical simulations confirm the effectiveness of the configurable OWCs matrix in reducing oscillations. The results demonstrate that the rectangular matrix platform significantly minimizes pitch motion across different wave conditions compared to a square barge, enhancing overall stability and efficiency.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122128"},"PeriodicalIF":4.6,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633169","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