Ocean Engineering最新文献

Experimental investigation into the diffraction of propagating L1-type crescent waves by a circular cylinder 圆柱传播l1型月牙波衍射的实验研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-05-02 DOI: 10.1016/j.oceaneng.2025.121219

Limeng Wang , Zhili Zou , Kai Yan , Qiupan Chen

{"title":"Experimental investigation into the diffraction of propagating L1-type crescent waves by a circular cylinder","authors":"Limeng Wang , Zhili Zou , Kai Yan , Qiupan Chen","doi":"10.1016/j.oceaneng.2025.121219","DOIUrl":"10.1016/j.oceaneng.2025.121219","url":null,"abstract":"<div><div>Crescent waves are an abnormal wave pattern caused by the instability of Stokes wave. In academic research, crescent waves are classified into symmetric and asymmetric types based on their surface profile symmetry. This study focuses on the diffraction effects of the asymmetric crescent waves (specifically, the propagating L<sub>1</sub>-type crescent waves) on a vertical cylinder, examining the spectral differences between the asymmetric crescent and Stokes wave fields, as well as the amplitude distribution and evolution across various orders around the cylinder. The findings indicate that, due to the resonant effect of the disturbance waves, energy is transferred from integer orders to non-integer orders. This transfer results in distinct non-integer order energy at 1.32<em>ω</em><sub>0</sub> and 1.68<em>ω</em><sub>0</sub> (<em>ω</em><sub>0</sub> is the Stokes wave frequency) in the amplitude spectrum, which may induce high-frequency resonance in marine structures. Additionally, the amplitude distribution of integer-order crescent waves around the cylinder aligns with that of corresponding Stokes waves. In contrast, the non-integer order amplitudes can be symmetric to the propagation direction of their disturbance waves, leading to significant contributions to high-frequency transverse forces. What's more, the non-integer order amplitudes can enhance the formation of sharp crests of crescent waves, promoting wave breaking and energy dissipation around the cylinder. It also can increase the pounding effect on the marine structure and raise the risk of overtopping.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"332 ","pages":"Article 121219"},"PeriodicalIF":4.6,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895970","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

Social sustainability through human-centered risks management in maritime industry: A shipbuilding case study with actors’ analysis 以人为本的海运业风险管理中的社会可持续性：以造船业为例及行动者分析

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-05-02 DOI: 10.1016/j.oceaneng.2025.121398

Hulya Yilmaz , Saliha Karadayi-Usta

{"title":"Social sustainability through human-centered risks management in maritime industry: A shipbuilding case study with actors’ analysis","authors":"Hulya Yilmaz , Saliha Karadayi-Usta","doi":"10.1016/j.oceaneng.2025.121398","DOIUrl":"10.1016/j.oceaneng.2025.121398","url":null,"abstract":"<div><div>The maritime industry offers diverse employment opportunities for individuals interested in working on or near the water. Shipbuilding, a key aspect of this industry, is an area of opportunity and challenge. It involves various key actors, including ship designers, engineers, builders, outfitters, and inspectors. This study explores social sustainability by concentrating on human-centered risk management in the shipbuilding process. It investigates the main actors involved in the shipbuilding process, identifies human-centered risks, examines the relationships between actors and risks to prevent accidents, and analyzes risk interrelationships to determine root causes. To achieve this aim, an interval-valued spherical fuzzy (IVSF)-based MACTOR (Matrix of Alliances and Conflicts: Tactics, Objectives and Recommendations) approach is proposed for the shipbuilding process. The proposed approach is compared with both traditional and fuzzy-based MACTOR variants, and a sensitivity analysis is conducted to assess its stability and robustness. Findings indicate that human error is the most significant risk, followed by miscommunication, technical errors, and occupational hazards. Ship designers and ship inspectors are identified as influential actors in the shipbuilding process, while shipbuilding engineers are considered leading actors. Effective human-centered risk management within shipbuilding necessitates collective effort that hinges on the proactive involvement, collaboration, and commitment of all actors.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"332 ","pages":"Article 121398"},"PeriodicalIF":4.6,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895968","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

Modeling and optimization of variable angle tow composite underwater cylindrical pressure hull based on isogeometric analysis method 基于等几何分析法的变角拖曳复合材料水下圆柱耐压壳体建模与优化

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-05-02 DOI: 10.1016/j.oceaneng.2025.121382

Hao Miao , Peng Jiao , Qun Chang , Zhihuan Ding , Zhiping Chen , Hao Duan

{"title":"Modeling and optimization of variable angle tow composite underwater cylindrical pressure hull based on isogeometric analysis method","authors":"Hao Miao , Peng Jiao , Qun Chang , Zhihuan Ding , Zhiping Chen , Hao Duan","doi":"10.1016/j.oceaneng.2025.121382","DOIUrl":"10.1016/j.oceaneng.2025.121382","url":null,"abstract":"<div><div>Composite cylindrical shells are commonly used in the lightweight design of underwater pressure hulls. The use of variable angle tow (VAT) design is expected to further reduce the weight. To address the issues of low efficiency in buckling calculation and the large number of design variables in VAT composite structures, this paper proposes a buckling optimization framework based on an isogeometric shell model. The suitable layup form and the buckling performance of VSC hulls are studied. Isogeometric analysis (IGA) shell elements with unidirectional order elevation and C0 continuous element boundaries are introduced in the hull model to reduce the time required for a single calculation. With the proposed IGA hull model, the optimization framework is built by using the Kriging model and Latin Hypercube Sampling methods. The optimization performance of two common VAT layups is examined by comparing their buckling results and computational costs. Based on the layup with better performance, the distribution of the approximate optimal buckling load of variable stiffness composite (VSC) hulls under different geometric parameters is investigated and compared with constant stiffness composite (CSC) hulls to find the reasonable application area of multi-layer VAT design.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"332 ","pages":"Article 121382"},"PeriodicalIF":4.6,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895969","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

USV path planning algorithm based on 20D-A∗ and IDWA algorithms under COLREGs COLREGs下基于20D-A *和IDWA算法的USV路径规划算法

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-05-01 DOI: 10.1016/j.oceaneng.2025.121389

Zuopeng Liang, Yi Yang, Zicheng Huang, Shibo Zhou

{"title":"USV path planning algorithm based on 20D-A∗ and IDWA algorithms under COLREGs","authors":"Zuopeng Liang, Yi Yang, Zicheng Huang, Shibo Zhou","doi":"10.1016/j.oceaneng.2025.121389","DOIUrl":"10.1016/j.oceaneng.2025.121389","url":null,"abstract":"<div><div>The path planning of Unmanned Surface Vehicles(USV) represents a pivotal technology for autonomous navigation. However, prevailing USV path planning methodologies frequently overlook the constraints imposed by the International Regulations for Preventing Collisions at Sea (COLREGs), resulting in certain deficiencies in the corresponding planned paths. To address this issue, a hybrid path planning algorithm integrating 20D-A∗ and improved dynamic window approach(IDWA) is proposed. The proposed algorithm enables USVs to comply with COLREGs requirements for collision avoidance when encountering other vessels. The 20D-A∗ algorithm performs an initial path planning based on the starting and ending points. When the USV encounters other vessels while navigating along the planned path, IDWA autonomously executes collision avoidance actions in compliance with COLREGs. This involves locally adjusting the planned path and resuming the original path once the avoidance actions have been completed. The experimental results demonstrate that the proposed method demonstrates high efficiency and obstacle avoidance performance in complex environments. It effectively addresses the impact of static obstacles and navigating vessels on the USV while satisfying the collision avoidance requirements specified by COLREGs. This research offers a novel solution for USV path planning in real-world navigation scenarios, showcasing promising application prospects.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"331 ","pages":"Article 121389"},"PeriodicalIF":4.6,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891997","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

High fidelity CFD models comparison to potential flow method in the simulation of full scale floating platform under free decay tests 高保真CFD模型与势流法在全尺寸浮式平台自由衰减试验模拟中的比较

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-05-01 DOI: 10.1016/j.oceaneng.2025.121385

Miguel Gil , Javier Armañanzas , Alexia Torres , Juan Pablo Fuertes , Guillen Campaña , Beatriz Mendez , Javier Leon

{"title":"High fidelity CFD models comparison to potential flow method in the simulation of full scale floating platform under free decay tests","authors":"Miguel Gil , Javier Armañanzas , Alexia Torres , Juan Pablo Fuertes , Guillen Campaña , Beatriz Mendez , Javier Leon","doi":"10.1016/j.oceaneng.2025.121385","DOIUrl":"10.1016/j.oceaneng.2025.121385","url":null,"abstract":"<div><div>The use of simulation models based on potential flow is widespread in the wind industry for the simulation of floating wind turbines. However, these analytical models have shortcomings in correctly representing the behavior of Floating Offshore Wind Turbines (FOWTs) under extreme wind and wave conditions. High fidelity Computational Fluid Dynamics (CFD) simulations aim to develop models where the fluid-structure interaction is more accurately modeled, allowing to correctly predict the behavior of wind turbines and thus to redesign structural components and save costs. In this paper, two different CFD simulation models are developed and compared, including different turbulence models (Reynolds-Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES)), numerical methodologies (Navier-Stokes and Lattice-Boltzmann method) and mooring models (Quasi-Static and Dynamic). Different free decay Load Cases (LC) are performed in XFlow and OpenFOAM, and the damping ratio and natural period of the system are analyzed with different mooring arrangements (Multi-Point Mooring (MPM) and Single-Point Mooring (SPM)), comparing all results with respect to a potential flow model (HydroDyn). A maximum error of 3.3 % in natural period and 1.6 % error in damping factor is obtained, small enough to validate the results of CFD models. Vorticity is also analyzed to understand the differences between both CFD models. Finally, the stress of the mooring lines is computed, which allows validating the mooring system model implemented in XFlow by means of external functions.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"331 ","pages":"Article 121385"},"PeriodicalIF":4.6,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143895431","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

Static consensus analysis of multi-AUV systems with impulsive protocol and time delays 具有脉冲协议和时滞的多auv系统静态一致性分析

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-05-01 DOI: 10.1016/j.oceaneng.2025.121370

Xun Yan , Wanzhen Luo , Jinjun Jia , Dapeng Jiang , Tiedong Zhang

引用次数: 0

Computing local crest phase speed in multi-directional sea states through the Spatial Hilbert Transform 利用空间希尔伯特变换计算多向海况下的局部波峰相速度

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-05-01 DOI: 10.1016/j.oceaneng.2025.121357

Ying Wang, Guillaume Ducrozet

{"title":"Computing local crest phase speed in multi-directional sea states through the Spatial Hilbert Transform","authors":"Ying Wang, Guillaume Ducrozet","doi":"10.1016/j.oceaneng.2025.121357","DOIUrl":"10.1016/j.oceaneng.2025.121357","url":null,"abstract":"<div><div>The detection of wave breaking plays a fundamental role in the modelling of this complex physical phenomenon within nonlinear potential flow solvers. Recent studies have demonstrated that utilizing the ratio of fluid velocity to local wave crest phase speed enables accurate identification of individual breaking waves in a wave field. However, evaluating the local wave crest phase speed poses great challenges, especially for multi-directional sea states. Based on the multi-dimensional Hilbert transform in space, we correlated the local phase function and amplitude components to a mixed local amplitude (envelope) and phase function. Then, associated with these slow-varying assumptions of the local quantities, two methodologies, the linear spatial Hilbert transform method and the spatial Hilbert transform method, are proposed to compute the local wave crest phase speed in multi-directional sea states. These approaches are first compared to a classical crest-tracking method for short-crested waves and then investigated in detail by accounting for the existence of nonlinearity, directionality, and spectrum bandwidth. The present work shows that the proposed spatial Hilbert transform method allows for an efficient and accurate evaluation of the local wave crest phase speed in multi-directional sea states, particularly for strongly nonlinear configurations.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"331 ","pages":"Article 121357"},"PeriodicalIF":4.6,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891998","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

Structural performance of steel tubular X-joints with uniform pitting under axial compression 轴压下均匀点蚀钢管x形接头的结构性能

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-30 DOI: 10.1016/j.oceaneng.2025.121334

Xiaoyu Yan , Jie Sheng , Zhanguo Ma , Xinyi Song , Lvyuan Zhou , Zongxing Zhang , Yuner Huang , Hongfei Chang

{"title":"Structural performance of steel tubular X-joints with uniform pitting under axial compression","authors":"Xiaoyu Yan , Jie Sheng , Zhanguo Ma , Xinyi Song , Lvyuan Zhou , Zongxing Zhang , Yuner Huang , Hongfei Chang","doi":"10.1016/j.oceaneng.2025.121334","DOIUrl":"10.1016/j.oceaneng.2025.121334","url":null,"abstract":"<div><div>Tubular X-joints are commonly used in harsh environment that make them prone to pitting corrosion. This necessitates the evaluation of their load-bearing performance after corrosion. This study examines the influence of pitting corrosion on the structural performance of CHS X-joints, and the effects of pit size and shape on the weakening degree of bearing capacity were analyzed. Compression tests were conducted on four tubular X-joints with mechanically drilled pits of different depths. The results show that the ultimate strength and initial stiffness of test specimens reduced with pit depth, with maximum reductions reaching 49.20 % and 36.15 %, respectively. Finite element parameter analysis model verified by experiments considers the influence of pit size and shape on bearing capacity. The results indicate that the influence of pit diameter is greater than that of depth. When the pit spacing is in the range of 15 mm–20 mm, the ultimate strength and initial stiffness of the X-joint are less affected by the variation of pit spacing. The spherical pit is the most detrimental to the compressive capacity of the X-joint, followed by the cylindrical pit under the same corrosion level.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"331 ","pages":"Article 121334"},"PeriodicalIF":4.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891992","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

Time-varying formation trajectory tracking scheme for underactuated USVs based on adaptive sliding mode control with improved guidance strategy 基于自适应滑模控制和改进制导策略的欠驱动usv时变编队轨迹跟踪方案

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-30 DOI: 10.1016/j.oceaneng.2025.121340

Zaopeng Dong , Wangsheng Liu , Yilun Ding , Sihang Lu , Zhihao Hu , Yuanchang Liu

{"title":"Time-varying formation trajectory tracking scheme for underactuated USVs based on adaptive sliding mode control with improved guidance strategy","authors":"Zaopeng Dong , Wangsheng Liu , Yilun Ding , Sihang Lu , Zhihao Hu , Yuanchang Liu","doi":"10.1016/j.oceaneng.2025.121340","DOIUrl":"10.1016/j.oceaneng.2025.121340","url":null,"abstract":"<div><div>An improved guidance strategy-based sliding mode control (SMC) scheme with Frenet trajectory planning is proposed in this paper, in order to achieve the time-varying formation trajectory tracking control of underactuated unmanned surface vehicles (USVs) in the presence of unknown marine disturbances. Firstly, by introducing the Frenet coordinate system, a time-varying formation strategy is implemented based on the leader-follower framework to obtain a smooth transformation in the desired trajectory. Meanwhile, to address the oscillation of the heading angle in traditional guidance strategy, an improved guidance strategy is proposed by designing a virtual heading rate to stabilize the heading angle errors. Furthermore, considering the complexity of designed virtual velocity, a first-order low-pass filter is designed to overcome the “differential explosion” issue and ensure a smooth transition effect. An adaptive sliding mode reaching law is proposed to reduce convergence time and eliminate the chattering of control inputs. In addition, a nonlinear disturbance observer is developed to estimate and compensate for complex ocean disturbances in real-time. Finally, the effectiveness and superiority of the proposed control scheme are verified by several simulation experiments.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"331 ","pages":"Article 121340"},"PeriodicalIF":4.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891994","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

Hydrodynamic response of an integrated structure with monopile-type offshore wind turbine and UHMWPE cage affected by wave and current 波浪和水流影响下单桩式海上风力机-超高分子量聚乙烯网箱一体化结构的水动力响应

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-30 DOI: 10.1016/j.oceaneng.2025.121368

Haisheng Zhao , Yiyang Hu , Qiang Shi , Wei Shi , Xin Li

{"title":"Hydrodynamic response of an integrated structure with monopile-type offshore wind turbine and UHMWPE cage affected by wave and current","authors":"Haisheng Zhao , Yiyang Hu , Qiang Shi , Wei Shi , Xin Li","doi":"10.1016/j.oceaneng.2025.121368","DOIUrl":"10.1016/j.oceaneng.2025.121368","url":null,"abstract":"<div><div>The comprehensive development and utilization of marine energies and resources have been concerned in recent years. A novel integrated structure including the offshore wind turbine (OWT) and aquaculture cage has been proposed to utilize the advantage of each part. In this study, a combined wave-current generation module is self-developed and implemented in the open-source module ‘waves2Foam’. Then, the hydrodynamic characteristics of the integrated structure under wave-current loading are researched based on the open-source toolbox ‘OpenFOAM’, by modeling the ultra-high molecular weight polyethylene (UHMWPE) aquaculture cage as the porous media model. It is noted that the influence of the UHMWPE cage on the hydrodynamic behaviors of the monopile is enlarged under combined wave-current loading, compared to the case under only wave loading. For example, when the wave with 1.44 m wave height and 5.054 s period is applied, the maximum changes for wave run-up and pressure on the monopile with cage are 7.55 % and 7.18 %, respectively, relative to that without cage, while these values become 17.94 % and 18.45 %, respectively, after additionally imposing the current with 0.4 m/s velocity. The present study guides into the design and safety assessment of the integrated structure in the engineering of exploiting marine resources.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"331 ","pages":"Article 121368"},"PeriodicalIF":4.6,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891991","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