Ocean Engineering最新文献_第9页

Three-dimensional VIV characteristics of the top-tensioned riser considering platform motion and pipe-soil coupling 考虑平台运动和管道-土壤耦合的顶张式立管三维 VIV 特性

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-10-29 DOI: 10.1016/j.oceaneng.2024.119626

{"title":"Three-dimensional VIV characteristics of the top-tensioned riser considering platform motion and pipe-soil coupling","authors":"","doi":"10.1016/j.oceaneng.2024.119626","DOIUrl":"10.1016/j.oceaneng.2024.119626","url":null,"abstract":"<div><div>The upper and lower boundaries of the riser are often oversimplified as clamped constraints in prior analyses of vortex-induced vibration (VIV), leading to the inaccurate predictions in the VIV responses. A three-dimensional VIV model of the top-tensioned riser is established considering the platform motion and the nonlinear pipe-soil interaction. The VIV hydrodynamic force is calculated by the Van der Pol wake oscillator, while the nonlinear soil resistance is obtained with the p-y curve method. A novel VIV analysis approach for the riser with upper and lower boundary disturbances is proposed based on Newmark-<em>β</em> method and fourth-order Runge-Kutta method. The availability of the methodology is corroborated by multiple cases. The effects of the platform motions and the pipe-soil coupling on the VIV characteristics of the riser are studied. The results show that high-amplitude surge and sway motions cause a deviation of the vibration attitude of the riser from the standard mode shape. The heave motion exerts minimal influence on the VIV characteristics because the majority of the axial displacement of the riser is compensated by the tensioners. The VIV amplitude at the bottom of the riser is heightened, with a slight reduction in VIV frequency attributed to the pipe-soil coupling.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540009","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 the potential tilt of tripod-bucket jacket foundation considering the effect of spudcan installation 考虑到掘进机安装的影响，预测三脚架-斗式夹层地基的潜在倾斜度

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-10-29 DOI: 10.1016/j.oceaneng.2024.119601

{"title":"Prediction of the potential tilt of tripod-bucket jacket foundation considering the effect of spudcan installation","authors":"","doi":"10.1016/j.oceaneng.2024.119601","DOIUrl":"10.1016/j.oceaneng.2024.119601","url":null,"abstract":"<div><div>As a new type of offshore foundation, the tripod-bucket jacket foundation has gradually been applied in deep sea and far sea areas with its advantages of strong overturning ability and easy installation. The new tripod-bucket jacket foundation is often installed in stages using a jack-up platform. The jack-up platform needs to enter the site many times. As the foundation of jack-up platform, the spudcan that provides support for the jack-up platform affects the stability of the adjacent in-place tripod-bucket foundation during spudcan installation. This paper studies the effect of spudcan installation on the adjacent in-place tripod-bucket foundation based on large deformation finite element (LDFE) analysis. Firstly, verification analysis was conducted to demonstrate the accuracy of the LDFE approach by comparing it with established knowledge. Subsequently, combining the soil flow mechanism, the bucket motion during spudcan penetration was studied. Systematic parametric studies on soil properties and spudcan-bucket spacing in clay and sand were carried out to investigate bucket stability. Practical judgment methods for assessing bucket stability in clay and sand were proposed. Based on the bucket stability evaluation for a field case, the judgment methods were validated and can provide a reference to the industry.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540007","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 on vortex-induced vibration of vertically suspended multilayer cables subjected to nonlinear shear flow 受非线性剪切流影响的垂直悬挂多层电缆涡流诱发振动的数值研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-10-29 DOI: 10.1016/j.oceaneng.2024.119457

{"title":"Numerical investigation on vortex-induced vibration of vertically suspended multilayer cables subjected to nonlinear shear flow","authors":"","doi":"10.1016/j.oceaneng.2024.119457","DOIUrl":"10.1016/j.oceaneng.2024.119457","url":null,"abstract":"<div><div>Suspended cables are susceptible to vortex-induced vibration (VIV) in the complex marine environment. Previous studies on the VIV response of suspended cables are relatively limited. This study focuses on the vertically suspended cables that connect the fixed wind turbine foundation to the cable buried under the seabed. Based on a well-verified FEM-FVM coupling model, the VIV response and stress distribution characteristics of the cables are investigated under the nonlinear shear flow conditions. It is found that the vibration process of the cable exhibits relatively stable single-mode characteristics at lower environmental velocities, while it is more prone to the multi-mode vibration response at higher environmental velocities. The cable is mainly dominated by the high-order frequency at the vibration amplitude peak, while it is mainly characterized by the low-order frequency at the vibration amplitude trough. A clear “O”-shaped vibration trajectory can be observed under the 1st-order vibration mode, but a chaotic and disordered vibration trajectory is shown under the blending of the 1st- and 2nd-order vibration modes. In addition, the cable is found to be susceptible to fatigue damage at the amplitude peak. The above conclusions can provide the technical support for the design of the suspended cables.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540006","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 critical analysis of machine learning in ship, offshore, and oil & gas corrosion research, part I: Corrosion detection and classification 机器学习在船舶、近海和油气腐蚀研究中的重要分析，第一部分：腐蚀检测和分类

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-10-29 DOI: 10.1016/j.oceaneng.2024.119600

{"title":"A critical analysis of machine learning in ship, offshore, and oil & gas corrosion research, part I: Corrosion detection and classification","authors":"","doi":"10.1016/j.oceaneng.2024.119600","DOIUrl":"10.1016/j.oceaneng.2024.119600","url":null,"abstract":"<div><div>Corrosion poses a significant threat to the integrity and longevity of ship, offshore, and oil & gas structures, resulting in substantial economic losses, environmental hazards, and safety concerns. In recent years, machine learning (ML) has emerged as a promising tool for corrosion analysis in maritime industry. This paper provides a critical review of prevalent ML approaches, including Convolutional Neural Networks (CNNs), Random Forests (RFs), computer vision, image processing techniques, and hybrid models in corrosion detection and classification from 2018 to 2024. Beyond a typical review, this study meticulously examines these approaches, focusing on model development, efficacy, limitations, and practical implementation challenges in details. Key findings reveal that while ML models hold considerable potential to enhance the efficiency of corrosion detection and classification, significant barriers such as data quality, model interpretability, and integration into existing maintenance workflows impede widespread adoption. Furthermore, the paper identifies best practices and proposes future research directions to bolster the robustness and reliability of ML models in corrosion analysis. The insights gleaned from this review aim to guide industry experts and academicians in developing more effective corrosion management strategies through the integration of machine learning, ultimately mitigating the impact of corrosion on maritime and offshore operations.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540008","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

On the spring-back and re-rounding mechanism of a plain dent on the sandwich pipe 关于夹砂管道上普通凹痕的回弹和再圆机制

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-10-29 DOI: 10.1016/j.oceaneng.2024.119491

{"title":"On the spring-back and re-rounding mechanism of a plain dent on the sandwich pipe","authors":"","doi":"10.1016/j.oceaneng.2024.119491","DOIUrl":"10.1016/j.oceaneng.2024.119491","url":null,"abstract":"<div><div>Dent defect is a common cause of failure of the submarine pipelines, which not only leads to a reduction in the structural resistance of the submarine pipeline but also may induce the collapse of the submarine pipeline. The study aims to thoroughly investigate the dent spring-back and re-rounding characteristics of the inner and outer pipe of the sandwich pipe under lateral loading. This paper examines the sandwich pipe's dent spring-back and re-rounding processes through experiments and numerical simulations. The study shows that a higher bonding strength and a larger dent orientation angle will result in more excellent dent spring-back of the inner and outer pipes. The core layer material on the inner and outer pipe dent spring-back has a significant impact. Internal pressure improvement contributes to improving the indentation re-rounding ability of the inner and outer pipes. The larger the annular ratio, the closer the sandwich pipe inner and outer pipe dent re-rounding ability is. Finally, empirical formulas of the inner and outer pipe dent re-rounding coefficients are established, and the average errors are less than 10%. The research results can provide theoretical guidance for the safe operation of submarine pipelines containing indentations.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540005","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 investigation on dynamic response of a floating buoy with intact and broken mooring system 带完整和破损系泊系统的浮标动态响应实验研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-10-29 DOI: 10.1016/j.oceaneng.2024.119551

{"title":"Experimental investigation on dynamic response of a floating buoy with intact and broken mooring system","authors":"","doi":"10.1016/j.oceaneng.2024.119551","DOIUrl":"10.1016/j.oceaneng.2024.119551","url":null,"abstract":"<div><div>The floating buoy exhibits large dynamic responses subjected to extreme ocean environmental conditions, easily leading to mooring failure events. The impact of mooring failure on the dynamic response of buoy needs to be studied. However, the hydrodynamic performance of buoy with the broken mooring system have not been comprehensively illustrated. A series of experiments are performed on the dynamic responses of a floating buoy in a wave basin. The motion responses and mooring tensions with the intact and broken mooring system are measured for the regular and irregular wave tests. The transient failure of a single mooring line and progressive failure of mooring system are investigated. The results indicate that the peak tension of the upwind mooring line tends to increase linearly with the increase of significant wave height. With the development of failure process, the motion responses tend to increase and the buoy gradually moves to a new equilibrium position. The progressive failure of mooring system leads to significantly increase in the sway and yaw motion directions, resulting in the extensive drift motion of the buoy. The results could be helpful to illustrate the mooring system failure mechanism and prevent further damage of buoy in shallow waters.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142540004","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

Event-triggered adaptive fault-tolerant control for marine vehicles with multiple faults and environmental disturbance 具有多重故障和环境干扰的海洋车辆的事件触发自适应容错控制

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-10-25 DOI: 10.1016/j.oceaneng.2024.119473

引用次数: 0

Study on vortex structure and hydrodynamic characteristics of water-exit projectile with shoulder ventilation 带肩部通风装置的出水弹丸的涡流结构和流体力学特性研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-10-25 DOI: 10.1016/j.oceaneng.2024.119622

引用次数: 0

Parametric analysis of a fully coupled USV-type wave energy converter: An approach based on wave-to-grid modelling 全耦合 USV 型波浪能转换器的参数分析：基于波浪到电网建模的方法

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-10-25 DOI: 10.1016/j.oceaneng.2024.119499

{"title":"Parametric analysis of a fully coupled USV-type wave energy converter: An approach based on wave-to-grid modelling","authors":"","doi":"10.1016/j.oceaneng.2024.119499","DOIUrl":"10.1016/j.oceaneng.2024.119499","url":null,"abstract":"<div><div>The integration of the wave energy converter and the unmanned surface vehicle (USV), which has the power generation capability and the mobile capability, is attracting increasing attention in concept design, control, and parametric study, as the integrated system can play a crucial role in the maritime sectors of commerce, science, and military. Enhancing the power generation of a USV-integrated wave energy converter contributes to prolonged USV operations or grid supply, but the power generation performance of this new-type device is significantly influenced by its various coupled subsystems, which requires a systematic methodology for distinguishing key design parameters. To address that problem, a comprehensive wave-to-grid model that reflects all subsystem coupling, energy losses, and constraints is developed to comprehensively describe system dynamics, and then a Taguchi method is employed to investigate the influence of selected design parameters on electric power generation. Results reveal that the piston area of the hydraulic cylinder and the accumulator pressure are the two most influential parameters affecting the time-averaged electric power of the proposed USV-type wave energy converter. The proposed methodology provides guidelines for technicians on how to design wave energy converters optimally.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529433","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

3D experimental investigation of floating breakwater with symmetrical openings and wing structures 具有对称开口和翼状结构的浮式防波堤的三维实验研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-10-25 DOI: 10.1016/j.oceaneng.2024.119624

{"title":"3D experimental investigation of floating breakwater with symmetrical openings and wing structures","authors":"","doi":"10.1016/j.oceaneng.2024.119624","DOIUrl":"10.1016/j.oceaneng.2024.119624","url":null,"abstract":"<div><div>To enhance the efficiency of floating breakwaters (FB) in attenuating long-period waves, a novel design featuring wing structures and forward openings was proposed. Both experimental and numerical studies were conducted in a two-dimensional wave tank to validate the feasibility and efficiency of its innovative wave dissipation mechanism. Nevertheless, the three-dimensional (3D) performance of the new configuration has not been thoroughly explored. Additionally, a portion of the wave energy impacting the rear wall of the FB propagates to the sheltered area, negatively affecting wave dissipation. Therefore, this paper presents an improved design and experimentally investigates its 3D hydrodynamic performance. The enhanced FB incorporates wing structures and symmetrical opening tunnels to augment wave energy dissipation. A comprehensive FB system, including the main body, connection structures, and mooring system, was meticulously engineered. A series of experiments were conducted in a wave pool, and the results demonstrate superior wave attenuation performance and minimal motion response of the novel FB. Furthermore, the effect of diffraction waves on wave attenuation performance was also investigated. The mooring system experiences uniform and minimal loading, confirming its design effectiveness. Consequently, the proposed 3D FB system exhibits promising potential for practical engineering applications.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529434","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