Ocean Engineering最新文献_第9页

Predicting failure envelopes of helical anchors under combined V-H-M loading using a regression-enhanced knowledge graph attention network 基于回归增强知识图关注网络的V-H-M复合载荷下螺旋锚杆失效包络预测

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-05 DOI: 10.1016/j.oceaneng.2025.122660

Katavut Vichai , Jim Shiau , Duy Tan Tran , Mohammad Khajehzadeh , Suraparb Keawsawasvong , Pitthaya Jamsawang

{"title":"Predicting failure envelopes of helical anchors under combined V-H-M loading using a regression-enhanced knowledge graph attention network","authors":"Katavut Vichai , Jim Shiau , Duy Tan Tran , Mohammad Khajehzadeh , Suraparb Keawsawasvong , Pitthaya Jamsawang","doi":"10.1016/j.oceaneng.2025.122660","DOIUrl":"10.1016/j.oceaneng.2025.122660","url":null,"abstract":"<div><div>This study presents a regression-adapted Knowledge Graph Attention Network (KGAT) integrated with Water Cycle-Moth Flame Optimization (WCMFO) to predict the three-dimensional failure envelopes of helical anchors embedded in anisotropic clay under combined vertical-horizontal-moment (V-H-M) loading. A comprehensive dataset of dimensionless load responses, i.e., normalized vertical, horizontal, and moment capacities (<em>V/As</em><sub><em>u</em></sub>, <em>H/Asᵤ</em>, <em>M/ADsᵤ</em>) is generated using Finite Element Limit Analysis (FELA). Key input parameters include the helix diameter ratio (<em>D</em><sub><em>h</em></sub><em>/D</em><sub><em>s</em></sub>), embedment ratio (<em>L/D</em><sub><em>s</em></sub>), strength anisotropy ratio (<em>r</em><sub><em>e</em></sub>), and load inclination angle (<em>β</em>), all of which influence the failure envelope topology. A hybrid KGAT-WCMFO model is developed to evaluate the FELA results, achieving high predictive accuracy with R<sup>2</sup> values exceeding 0.97 for both <em>H/Asᵤ</em> and <em>M/ADsᵤ</em>. The predicted failure envelopes closely match those from FELA and effectively capture the nonlinear interactions among soil strength, anchor geometry, and load direction. These results highlight the model's potential as a robust surrogate tool for rapid and accurate geotechnical assessments under complex loading conditions.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"341 ","pages":"Article 122660"},"PeriodicalIF":5.5,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996641","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

Quantum-inspired optimal sensor deployment for 3D localization under uncertain target in stratified oceanic environment 分层海洋环境中不确定目标下三维定位的量子传感器优化部署

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-05 DOI: 10.1016/j.oceaneng.2025.122646

Xiaojun Mei , Huafeng Wu , Fahui Miao , Dezhi Han

{"title":"Quantum-inspired optimal sensor deployment for 3D localization under uncertain target in stratified oceanic environment","authors":"Xiaojun Mei , Huafeng Wu , Fahui Miao , Dezhi Han","doi":"10.1016/j.oceaneng.2025.122646","DOIUrl":"10.1016/j.oceaneng.2025.122646","url":null,"abstract":"<div><div>Localization is a critical task in ocean exploration and resource development, wherein an effective sensor deployment strategy significantly enhances localization accuracy. However, achieving optimal sensor deployment for time-of-arrival (TOA)-based localization is challenging due to the highly dynamic and stratified nature of the oceanic propagation environment. The uncertainty in target positions, compounded by measurement noise, hinders the performance of conventional location-based approaches in determining optimal sensor configurations. Moreover, the reliance on strict mathematical assumptions further limits the applicability of these techniques in practical, uncertain oceanic environments. To address these limitations, this study proposes a quantum-inspired optimal deployment framework for TOA-based localization in a three-dimensional, uncertain, and stratified oceanic environment. A mesh grid-based uncertainty mitigation strategy is introduced to estimate target locations under uncertainty. Incorporating Snell’s law and ray-tracing theory, a min-max optimization model is formulated based on the A-optimality criterion. To overcome restrictive analytical assumptions, a Quantum-Enhanced Sparrow Search Algorithm (QESSA) with multiple adaptive strategies is proposed to determine optimal sensor deployments. Simulation results validate the superiority and robustness of the proposed method across various scenarios, outperforming several state-of-the-art techniques.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"341 ","pages":"Article 122646"},"PeriodicalIF":5.5,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004054","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

A numerical calculation framework for dynamic analysis of single-point moored floating offshore wind turbines 单点系泊浮式海上风力机动力分析的数值计算框架

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-05 DOI: 10.1016/j.oceaneng.2025.122674

Andi Xu , Jingwei Zhou , Fengming Li

{"title":"A numerical calculation framework for dynamic analysis of single-point moored floating offshore wind turbines","authors":"Andi Xu , Jingwei Zhou , Fengming Li","doi":"10.1016/j.oceaneng.2025.122674","DOIUrl":"10.1016/j.oceaneng.2025.122674","url":null,"abstract":"<div><div>Motivated by the idea of combining the advantages of catenary anchor leg mooring technology and stability of spar buoys, a single-point moored floating offshore wind turbine (FOWT) subjected to coupling effects of wind, wave and current is proposed and designed, and an effective numerical calculation model for the dynamic analysis of this system is developed. In this numerical model, the floating structures are regarded as rigid bodies with six-degree-of-freedom motions, and the deformations of mooring lines are implemented based on the vector form intrinsic finite element (VFIFE) method. The feasibility and accuracy of the present model are verified against the OrcaFlex software. The weathervane effect, i.e. the typical feature of single-point mooring system is realized and displayed when wind-wave-current direction changes. The influences of wind-wave-current direction, inclination angles of the anchor chains, and parameters of mooring lines on tensions and floating structure movements are investigated. The present model shows good ability to predict large rotation of the mooring lines, and assess the operational performance of the single-point mooring system. Moreover, in the situations when bending and torsional stiffnesses of mooring lines are not negligible, the present model is still capable of obtaining accurate results.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"341 ","pages":"Article 122674"},"PeriodicalIF":5.5,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996640","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

TAD-YOLO: A lightweight nearshore ship detection method for small USVs in maritime trade surveillance TAD-YOLO：一种用于海上贸易监视中小型无人潜航器的轻型近岸船舶探测方法

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-05 DOI: 10.1016/j.oceaneng.2025.122618

Xiaofei Yang , Shuo Shao , Weiyong Liu , Zhengrong Xiang , Bin Zhang

{"title":"TAD-YOLO: A lightweight nearshore ship detection method for small USVs in maritime trade surveillance","authors":"Xiaofei Yang , Shuo Shao , Weiyong Liu , Zhengrong Xiang , Bin Zhang","doi":"10.1016/j.oceaneng.2025.122618","DOIUrl":"10.1016/j.oceaneng.2025.122618","url":null,"abstract":"<div><div>In recent years, the application of unmanned surface vehicles (USVs) in maritime trade surveillance has attracted more attention. The core technology is a robust, low-complexity, and highly accurate ship detection algorithm. However, the complex environmental conditions present significant challenges. So, we propose a new robust and lightweight model, TAD-YOLO, based on the YOLOv8 framework. It introduces innovative designs in the Feature Pyramid Shared Convolution (FPSC), the Adaptive Selective Dimensional Feature-Focused Diffusion Pyramid Network (ASDFDPN), and the Dynamically Coupled Task Modulation Head (DY-CTMH). In addition, we constructed a multi-view ship dataset, MULTI-SHIP, for training and validating the proposed model. Extensive experiments demonstrate that, compared with YOLOv8, TAD-YOLO improves the meanAverage Precision (mAP50-95) by 1.8 %, 1.9 %, and 3.5 % on the MULTI-SHIP, Seaships, and WSODD datasets, respectively, while reducing the number of parameters and GFLOPs by 30 % and 26 %. Moreover, it exhibits stronger robustness under various weather conditions. Finally, we deployed the model on a USV equipped with a Jetson Orin Nano Super platform and tested it on real images captured during actual USV operations. The model achieved a processing speed of approximately 61 FPS, with an inference time of around 16 ms per image, meeting the real-time performance requirements for nearshore ship detection.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"341 ","pages":"Article 122618"},"PeriodicalIF":5.5,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996647","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

A parallel guidance and control method for path planning and collision avoidance of unmanned surface vehicles 一种无人水面车辆路径规划与避碰并行制导控制方法

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-05 DOI: 10.1016/j.oceaneng.2025.122533

Xiaojie Sun , Weidong Zhang , Dongdong Mu , Xiaona Song , Pengju Si , Yunsheng Fan

{"title":"A parallel guidance and control method for path planning and collision avoidance of unmanned surface vehicles","authors":"Xiaojie Sun , Weidong Zhang , Dongdong Mu , Xiaona Song , Pengju Si , Yunsheng Fan","doi":"10.1016/j.oceaneng.2025.122533","DOIUrl":"10.1016/j.oceaneng.2025.122533","url":null,"abstract":"<div><div>In dynamically changing water environments, enabling unmanned surface vehicles (USVs) to safely navigate around obstacles and autonomously reach mission destinations constitutes a core research focus in USV technology. Path planning and collision avoidance control serve as pivotal technologies for realizing autonomous navigation systems. This paper explores an integrated strategy for these critical components, addressing two key challenges: traditional path planners exhibit slow computation speeds, impeding rapid responses to environmental changes; and avoidance controllers based on dynamic constraints risk local optima. To resolve these issues, a parallel guidance and control framework is proposed, emphasizing real-time interaction between the avoidance controller and path planner. The avoidance controller uses local sensor data to manage immediate collision risks, while the path planner optimizes global path using updated state constraints. By integrating environmental awareness and kinematic information, this approach overcomes local optimization issues and dynamically adapts paths to reconcile planned trajectories with actual vessel dynamics. Simulation results demonstrate that the proposed method significantly reduces collision probabilities by aligning planned paths with real-time vessel positions and headings. This research enhances USV navigation reliability in complex water environments through integrated global planning and local reactive control.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"341 ","pages":"Article 122533"},"PeriodicalIF":5.5,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996645","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

Influence of stepped bottom topography on the hydrodynamic performance of comb-type breakwater 阶梯式底地形对梳式防波堤水动力性能的影响

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-05 DOI: 10.1016/j.oceaneng.2025.122677

Yuanjie Li, Yang Zhang, Wenjin Zhu, Xiaotian Dong, Guodong Xu

{"title":"Influence of stepped bottom topography on the hydrodynamic performance of comb-type breakwater","authors":"Yuanjie Li, Yang Zhang, Wenjin Zhu, Xiaotian Dong, Guodong Xu","doi":"10.1016/j.oceaneng.2025.122677","DOIUrl":"10.1016/j.oceaneng.2025.122677","url":null,"abstract":"<div><div>The present study develops a semi-analytical solution of oblique waves interaction with a comb-type breakwater mounted at the stepped bottom topography, based on the linear potential theory and the matching eigenfunction expansion method. The solution is validated through energy flux conservation and comparisons with the published results. Results indicate that the step height significantly influences the hydrodynamic coefficients, accompanied by the occurrence of the step wave resonance. The abrupt changes of the hydrodynamic coefficients are attributed to the appearance of multiple reflected and transmitted waves propagating along different directions. Interestingly, in the presence of the stepped bottom topography, the propagating directions and the total number of the reflected waves are different from those of the transmitted waves. The trigger frequency of the multiple reflected or transmitted waves shifts to the lower frequency region with an increasing incidence angle and step height. The first named along-shore resonance above the step is accompanied by the peak of the <em>x</em>-axis wave force, which is harmful to the structural capability. The present study provides a theoretical basis for the design optimization of comb-type breakwaters on stepped bottom topography.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"341 ","pages":"Article 122677"},"PeriodicalIF":5.5,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145003920","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

The interaction between the free surface and a shallowly submerged underwater vehicle travelling in small-sized open channel flows 在小型明渠中航行的浅水下航行器与自由水面之间的相互作用

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-05 DOI: 10.1016/j.oceaneng.2025.122547

Xinyao Zhu , Yue Han , Pu Yang , Daiyu Zhang

{"title":"The interaction between the free surface and a shallowly submerged underwater vehicle travelling in small-sized open channel flows","authors":"Xinyao Zhu , Yue Han , Pu Yang , Daiyu Zhang","doi":"10.1016/j.oceaneng.2025.122547","DOIUrl":"10.1016/j.oceaneng.2025.122547","url":null,"abstract":"<div><div>The present study aims to investigate the interaction between the free surface, walls and autonomous underwater vehicles (AUVs) when AUVs travelling in small-sized open channel flows for various aqueduct cross-section sizes. For these scenarios, the forces acting on AUVs are affected by many factors, i.e., the blockage effect, the near-wall effect, the free surface effect, and the interaction between the wall and the free surface. In this respect, a comparative numerical investigation has been conducted by simulating both the flow fields of AUV sailing in open channel and fully filled channels. The numerical models are verified against the existing experimental data. The obtained results indicate that hydrodynamic forces, moments acting on the AUV and the maximum wave elevation of the AUV-generated wave system decrease significantly as the normalized cross-sectional size of the aqueduct <em>D</em><sub>A</sub>∗ increases from 6 to 20 at high travelling speeds, while they change slightly for a medium-low travelling speed. The effect of wall-free surface coupling can be disregarded at about <em>D</em><sub><em>A</em></sub><em>∗</em> = 17 for a high speed, and at about <em>D</em><sub><em>A</em></sub><em>∗</em> = 8 for a medium-low speed. For medium-low travelling speed, although significant differences in far wake field waveforms are observed, the near-field wake characteristics around the AUV remain insignificantly altered.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"341 ","pages":"Article 122547"},"PeriodicalIF":5.5,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996639","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

Differences in the motion response of single and multi-body floating photovoltaic under wave action 波浪作用下单体和多体漂浮光伏运动响应的差异

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-05 DOI: 10.1016/j.oceaneng.2025.122666

Xizeng Zhao , Shiwen Wang , Yun Pan , Jianbo Hu

引用次数: 0

Parametric sensitivity analysis of soil properties for retrofitted offshore wind turbine jacket substructures under combined environmental loading 组合环境荷载下海上风力机导管套子结构改型土性参数敏感性分析

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-05 DOI: 10.1016/j.oceaneng.2025.122690

Muhammad Moman Shahzad , Muhammad Hassaan Farooq Khan , Daeyong Lee

{"title":"Parametric sensitivity analysis of soil properties for retrofitted offshore wind turbine jacket substructures under combined environmental loading","authors":"Muhammad Moman Shahzad , Muhammad Hassaan Farooq Khan , Daeyong Lee","doi":"10.1016/j.oceaneng.2025.122690","DOIUrl":"10.1016/j.oceaneng.2025.122690","url":null,"abstract":"<div><div>This research provides a comprehensive parametric evaluation of the retrofitting process for a 5.5 MW offshore wind turbine jacket substructure, designed to support an upgraded 15 MW turbine under various environmental loading conditions, which include the influences of wind, waves, and currents. Advanced nonlinear time history finite element analyses, featuring extensive soil–structure interaction modeling, were conducted across a diverse range of soil profiles, which included both uniform conditions and complex heterogeneous scenarios, exemplified by the Gunsan soil profile. The findings indicate that the retrofitted 15 MW jacket configuration substantially diminishes structural demands, with Von Mises stresses reduced by as much as 12 % in critical joint regions of the legs. Nonetheless, localized stress concentrations were noted near the top of the tower when exposed to stratified soil conditions. Furthermore, lateral accelerations at pivotal structural points were reduced by up to 73 %, consistently remaining below the operational threshold of 0.3 g. Logarithmic strains and lateral displacements significantly decreased, especially in low-stiffness soils, with reductions up to 88 % relative to the original 5.5 MW system. The research indicates that well-structured and efficient foundations improve dynamic performance, stability, and longevity, offering critical insights for future design and retrofitting in complex settings.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"341 ","pages":"Article 122690"},"PeriodicalIF":5.5,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145003918","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 method for full-process analysis of tapered CFDST members under individual and combined loads 单独和组合荷载作用下锥形CFDST构件全过程分析的理论方法

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-05 DOI: 10.1016/j.oceaneng.2025.122626

Xiang-Hong Liu , Qing Sun , Sital Kumar Dangi , Qian Gao , Zai-Yu Zhang , Jian-Tao Wang

{"title":"Theoretical method for full-process analysis of tapered CFDST members under individual and combined loads","authors":"Xiang-Hong Liu , Qing Sun , Sital Kumar Dangi , Qian Gao , Zai-Yu Zhang , Jian-Tao Wang","doi":"10.1016/j.oceaneng.2025.122626","DOIUrl":"10.1016/j.oceaneng.2025.122626","url":null,"abstract":"<div><div>The conventional design formulas for tapered concrete-filled double-skin steel tubular (TCFDST) structures used in offshore wind turbine tower are limited to calculating ultimate capacity. These formulas cannot characterize stiffness degradation or load redistribution mechanisms throughout the loading process. Additionally, the finite element (FEM) analysis demands significant computational resources and time. In order to facilitate designers to quickly evaluate the mechanical properties of the typical structure, this paper establishes three theoretical methods for TCFDST members under axial compression, combined compression and bending, and combined compression and torsion. The theoretical methods were validated against FEM results for predicting the full-process loading curves. Besides, stress distribution and load transfer mechanisms were verified through the methods and FEM. Subsequently, parametric study by using the theoretical methods and FEM was conducted to investigate the impact on bearing capacity of three loading conditions based on the hollow ratio (e.g., as the hollow ratio increases from 0.38 to 0.95, the peak load error ranges from 1.90 % to 2.66 % under axial compression), the diameter-to-thickness (<em>D/t</em>) ratio of the outer and inner steel tubes, concrete strength, steel tubes strength, compressive ratio, and column height. The applicability of the theoretical methods was assessed by experimental and FEM results and compared with the conventional design formulas.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"341 ","pages":"Article 122626"},"PeriodicalIF":5.5,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996638","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