Ocean Engineering最新文献_第10页

Numerical research on hydrodynamic performance of toroidal propeller under the influence of geometric parameters 几何参数影响下环形螺旋桨流体力学性能的数值研究

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-05 DOI: 10.1016/j.oceaneng.2024.119704

Chunhui Wang , Shun Liu , Kun Xia , Chao Wang , Liyu Ye

{"title":"Numerical research on hydrodynamic performance of toroidal propeller under the influence of geometric parameters","authors":"Chunhui Wang , Shun Liu , Kun Xia , Chao Wang , Liyu Ye","doi":"10.1016/j.oceaneng.2024.119704","DOIUrl":"10.1016/j.oceaneng.2024.119704","url":null,"abstract":"<div><div>Recent advancements in high-efficiency, low-noise toroidal propellers have garnered significant interest due to their potential to revolutionize maritime propulsion. This study addresses this gap by leveraging established geometrical modeling methods for toroidal propellers to design a novel variant, and assesses its hydrodynamic performance using the Reynolds-averaged Navier-Stokes (RANS) method coupled with the Shear Stress Transport (SST) <em>k-ω</em> turbulence model. First, the paper introduces the toroidal propeller concept and modeling method before analyzing the impact of grid size on numerical simulations. The correspondence between numerical results and experimental data is then established to validate the computational model's accuracy. Following this, the study explores the hydrodynamic performance of the toroidal propeller, including pressure distribution on the blade surface and the flow field dynamics in the propeller's wake across varying advance coefficients. Subsequently, it examines the influence of geometric parameters such as axis span ratios, lateral angles, roll angles, and vertical angles, on the hydrodynamic performance, elucidating their effects on the pressure distribution profiles at radial sections, thrust coefficient, and open water efficiency. The findings provide substantial guidance for the geometric parameter selection in the optimal design of future toroidal propellers.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119704"},"PeriodicalIF":4.6,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586596","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 mixed stochastic waves model for analyzing offshore structures considering engineering characteristics correlation of wind-generated-wave and swell 用于分析近海结构的混合随机波浪模型，考虑风生波和涌浪的工程特性相关性

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-05 DOI: 10.1016/j.oceaneng.2024.119671

Gang Li, Yunmu Jiang, Dinghao Yu, Zhiqian Dong

{"title":"A mixed stochastic waves model for analyzing offshore structures considering engineering characteristics correlation of wind-generated-wave and swell","authors":"Gang Li, Yunmu Jiang, Dinghao Yu, Zhiqian Dong","doi":"10.1016/j.oceaneng.2024.119671","DOIUrl":"10.1016/j.oceaneng.2024.119671","url":null,"abstract":"<div><div>In the marine environment, offshore structures face mixed stochastic waves, including wind-generated waves and swells. Current design codes often overlook swells, leading to underestimations of environmental loads and structural responses, especially for flexible structures, potentially causing resonance and instability. Wind-generated waves and swells have distinct generation mechanisms, but their characteristics, such as significant wave height and average period, show a statistical correlation due to their interaction. Thus, a mixed stochastic wave model is needed to reflect both wave types and their correlation accurately. This study investigates the correlation of wave characteristics and the power density spectrum (PSD) between wind-generated waves and swells using measured data, providing a comprehensive understanding of mixed wave interactions. The joint probability density model of wave characteristics is discussed via Vine Copula theory. A framework for obtaining mixed wave loads is developed using the Proper Orthogonal Decomposition (POD) method, treating waves as a 1 dimension - 2 variables (1D-2V) stochastic vector process. The model is applied to assess the dynamic response of a 5 MW mono-pile offshore wind turbine (OWT). Results show that swells significantly increase the internal force and bending moment demands, highlighting the necessity of including swells in offshore structure design and analysis.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119671"},"PeriodicalIF":4.6,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586595","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

An accelerated corrosion-fatigue testing method for marine high-strength steel based on equivalence principle of fatigue crack growth 基于疲劳裂纹增长等效原理的船用高强度钢加速腐蚀疲劳试验方法

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-05 DOI: 10.1016/j.oceaneng.2024.119706

Ruonan Zhang , Pengyu Wei , Ke Wang , Peilong Song , Xin Guo , Qingbo Zeng , Shengpeng Li

{"title":"An accelerated corrosion-fatigue testing method for marine high-strength steel based on equivalence principle of fatigue crack growth","authors":"Ruonan Zhang , Pengyu Wei , Ke Wang , Peilong Song , Xin Guo , Qingbo Zeng , Shengpeng Li","doi":"10.1016/j.oceaneng.2024.119706","DOIUrl":"10.1016/j.oceaneng.2024.119706","url":null,"abstract":"<div><div>The corrosion-fatigue test is widely used to assess marine equipment. However, due to the low-frequency and high-cycle loading of marine equipment in service, conventional test methods require long cycle times and high costs. This makes it challenging to meet the rapid evaluation demands associated with equipment development effectively. In this study, an accelerated corrosion test method was proposed for steel by adjusting the composition, temperature, pH and H<sub>2</sub>O<sub>2</sub> concentration of environment. Fatigue crack growth tests were conducted under various corrosion environments and load frequencies. The matching relationships between corrosion fatigue acceleration multiplier, corrosion environment parameters and load parameters were established. Additionally, a corrosion fatigue acceleration test method was proposed based on the equivalent principle of fatigue crack growth. The results show that effective coupling between corrosion and fatigue can be achieved by gradually reducing the load frequency as the stress intensity factor amplitude increases throughout the crack growth process. It is consistent with the trend of fatigue crack growth rate in the seawater environment. The 4.85% fatigue life deviation and the 15.68 times corrosion fatigue acceleration can be achieved by our method. This work improves the accuracy and reliability of fatigue performance evaluation for offshore equipment.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119706"},"PeriodicalIF":4.6,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593993","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

Hybrid underwater imaging for the tri-dimensional inspection of critical structural elements in offshore platforms 用于海上平台关键结构件三维检测的混合水下成像技术

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-05 DOI: 10.1016/j.oceaneng.2024.119658

Pedro Nuno Leite , Pedro Nuno Pereira , João M.M. Dionísio , Andry Maykol Pinto

{"title":"Hybrid underwater imaging for the tri-dimensional inspection of critical structural elements in offshore platforms","authors":"Pedro Nuno Leite , Pedro Nuno Pereira , João M.M. Dionísio , Andry Maykol Pinto","doi":"10.1016/j.oceaneng.2024.119658","DOIUrl":"10.1016/j.oceaneng.2024.119658","url":null,"abstract":"<div><div>Offshore wind farms face harsh maritime conditions, prompting the use of sacrificial anodes to prevent rapid structural degradation. Regular maintenance and replacement of these elements are vital to ensure ongoing corrosion protection, maintain structural integrity, and optimize efficiency. This article details the design and validation of the MARESye hybrid underwater imaging system, capable of retrieving heterogeneous tri-dimensional information with millimetric precision for the close-range inspection of submerged critical structures. The optical prowess of the system is first validated during low turbidity trials where the volumetric properties of a decommissioned anode are reconstructed with absolute errors down to 0.0008m, and its spatial dimensions are depicted with sub-millimeter precision accounting for relative errors as low as 0.31%. MARESye is later equipped as payload in a commercial ROV during a real environment inspection mission at the ATLANTIS Coastal Test Center. This experiment sees the sensor provide live reconstructions of a sacrificial anode, revealing a biofouling layer of approximately 0.0130m thickness. The assessment of the high-fidelity 2D/3D information obtained from the MARESye sensor demonstrates its potential to enhance the situational awareness of underwater vehicles, fostering reliable O&M procedures.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119658"},"PeriodicalIF":4.6,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586591","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

Mechanical modulation wave energy harvesting for self-powered marine environment monitoring 用于自供电海洋环境监测的机械调制波能采集技术

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-04 DOI: 10.1016/j.oceaneng.2024.119683

Hong-Xiang Zou , Wen-Zhuo Zhou , Chang-Sheng Su , Ding-Hua Guo , Lin-Chuan Zhao , Qiu-Hua Gao , Ke-Xiang Wei

{"title":"Mechanical modulation wave energy harvesting for self-powered marine environment monitoring","authors":"Hong-Xiang Zou , Wen-Zhuo Zhou , Chang-Sheng Su , Ding-Hua Guo , Lin-Chuan Zhao , Qiu-Hua Gao , Ke-Xiang Wei","doi":"10.1016/j.oceaneng.2024.119683","DOIUrl":"10.1016/j.oceaneng.2024.119683","url":null,"abstract":"<div><div>Small-scale wave energy harvesting can be used for self-powered marine environmental monitoring, with the advantages of sustainability, convenience, and environmental protection. The low-frequency and strong random fluctuations of ocean wave motion are not conducive to electromechanical conversion. In this paper, we propose a mechanically modulated wave energy harvester embedded with interference-free triboelectric nanogenerators. The mass pendulum oscillates under irregular low-frequency wave excitation, and then the oscillation is mechanically modulated into a unidirectional high-speed rotation of four permanent magnet disks. The elastic parts on both sides of the mass pendulum are functionalized into multi-layered folding triboelectric nanogenerators, which neither increase the volume of the wave energy harvesting system nor affect the operation of the electromagnetic generator. The prototype was manufactured and the experimental results show that the sum of the average power of the prototype is 4.8 W under excitation at a frequency of 3 Hz and a inclination angle of 40°. The 0.47 F capacitor can be charged to 5 V in 80 s by the prototype under the wave excitation generated by push plate, and then used for self-powered marine environmental monitoring (illumination, temperature and pH) and wireless information transmission.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119683"},"PeriodicalIF":4.6,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586665","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

Risk-aware stochastic ship routing using constrained continuous belief tree search 使用受限连续信念树搜索的风险感知随机船舶路由选择

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-04 DOI: 10.1016/j.oceaneng.2024.119581

Andre Nuñez , Jennifer Wakulicz , Felix H. Kong , Alberto González-Cantos , Robert Fitch

{"title":"Risk-aware stochastic ship routing using constrained continuous belief tree search","authors":"Andre Nuñez , Jennifer Wakulicz , Felix H. Kong , Alberto González-Cantos , Robert Fitch","doi":"10.1016/j.oceaneng.2024.119581","DOIUrl":"10.1016/j.oceaneng.2024.119581","url":null,"abstract":"<div><div>Improved route planning for commercial shipping can enable reduced environmental impact, improve ship safety records, and lower fuel and maintenance costs. A fundamental challenge is to design ship routing algorithms that can contend with uncertain weather forecasts and real-world models of ship performance and safety. This paper introduces a stochastic ship routing framework that uses the conditional value-at-risk (CVaR) metric to guide the behaviour of a modified Continuous Belief Tree Search (CBTS) algorithm to find a safe and fuel-efficient long-haul shipping route. Our method provides a principled means to utilise a probabilistic representation of weather forecasts derived from ensemble forecasting for the purpose of route planning and allows for a user-defined threshold of risk tolerance. Another key advantage of our method is its ability to dynamically choose candidate route waypoints using weather-dependent estimates of fuel and safety information. Evaluation of long-haul routes through the Atlantic, Pacific and Indian oceans using real-world ship performance models and weather forecasts show considerable improvements in fuel usage and computation time compared to state-of-the-art ship routing algorithms.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119581"},"PeriodicalIF":4.6,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586666","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

Economics-constrained tidal turbine array layout optimisation at the Putuoshan–Hulu island waterway 普陀山-葫芦岛水道经济约束下的潮汐涡轮机阵列布局优化

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-04 DOI: 10.1016/j.oceaneng.2024.119618

Can Zhang , Xiaoming Cheng , Athanasios Angeloudis , Stephan C. Kramer , Chengsheng Wu , Ying Chen , Matthew D. Piggott

{"title":"Economics-constrained tidal turbine array layout optimisation at the Putuoshan–Hulu island waterway","authors":"Can Zhang , Xiaoming Cheng , Athanasios Angeloudis , Stephan C. Kramer , Chengsheng Wu , Ying Chen , Matthew D. Piggott","doi":"10.1016/j.oceaneng.2024.119618","DOIUrl":"10.1016/j.oceaneng.2024.119618","url":null,"abstract":"<div><div>For the successful large scale commercialisation of the tidal stream energy industry it is imperative to consider array revenue rather than simply array power performance. This article reports on the application of a gradient-based optimisation algorithm to establish the optimal array size and layout at the Putuoshan–Hulu Islands waterway. Array economic viability is considered within the optimisation by introducing a break even power concept. Results show that the break even power constraint promotes increased power output per turbine. In response, the overall turbine number decreases due to economics-constraints, leading to an overall reduction in overall array energy yield. Thus, array profit decreases with increments in break even power. A hypothetical practical constraint linking water depth and array cost is also considered, demonstrating an intricate relationship between array design and spatial variability. Finally, using these numerical experiments, we derive development priority maps based on the optimised turbine layouts in order to help guide the tidal stream energy developments in the Putuoshan–Hulu Islands waterway.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119618"},"PeriodicalIF":4.6,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586662","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

Traffic complexity assessment on the malacca strait with traffic zone matrix based on AIS data 基于 AIS 数据的交通区矩阵评估马六甲海峡的交通复杂性

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-04 DOI: 10.1016/j.oceaneng.2024.119687

Dapei Liu , Zihao Liu , Hooi-Siang Kang , Chee-Loon Siow , C. Guedes Soares

引用次数: 0

Enhancing underwater thruster anomaly detection with support vector glow encoding description 利用支持向量辉光编码描述加强水下推进器异常检测

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-04 DOI: 10.1016/j.oceaneng.2024.119655

Wenliao Du , Zihan Xiong , Pengxiang Zhu , Ziqiang Pu , Chuan Li , Dongdong Hou

{"title":"Enhancing underwater thruster anomaly detection with support vector glow encoding description","authors":"Wenliao Du , Zihan Xiong , Pengxiang Zhu , Ziqiang Pu , Chuan Li , Dongdong Hou","doi":"10.1016/j.oceaneng.2024.119655","DOIUrl":"10.1016/j.oceaneng.2024.119655","url":null,"abstract":"<div><div>As the driving system of autonomous underwater vehicles (AUVs), the healthy operation of underwater thrusters is crucial to ensure the performance of AUVs. Due to the challenge of obtaining faulty samples during normal operation, anomaly detection of underwater thrusters is often carried out using only normal samples. To address this, Support Vector Glow Encoding Description (SVGED) is proposed for anomaly detection of underwater thrusters trained with only normal samples. Specifically, the deep features of the operational vibration signals collected from the underwater thruster are extracted by a deep convolutional autoencoder based on a glow model. The glow-encoded data are then used to identify the boundary of normal operation for the underwater thruster. When a new sample enters the trained SVGED model, it can be effectively identified as representing a normal or anomalous condition of the underwater thruster. The developed SVGED was evaluated using AUV experiments. When using the proposed SVGED method, the accuracy reaches 99.81%, Results show that the proposed method can effectively real time detect anomalies in the underwater thruster compared to other methods. It lays the foundation for ensuring the healthy operation of AUVs.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119655"},"PeriodicalIF":4.6,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586593","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 reliability of pre-deformation to control lateral buckling of pipelines: An evaluation based on observed embedment trends 预变形控制管道横向屈曲的可靠性：根据观察到的嵌入趋势进行评估

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2024-11-04 DOI: 10.1016/j.oceaneng.2024.119657

Jayden Chee , Phil Watson , David White , Alastair Walker

{"title":"The reliability of pre-deformation to control lateral buckling of pipelines: An evaluation based on observed embedment trends","authors":"Jayden Chee , Phil Watson , David White , Alastair Walker","doi":"10.1016/j.oceaneng.2024.119657","DOIUrl":"10.1016/j.oceaneng.2024.119657","url":null,"abstract":"<div><div>Pre-deformation of a pipeline into a continuous sinusoidal wave-like form has been shown to be effective at controlling lateral buckling of subsea pipelines due to a substantially lower axial stiffness and the limiting of maximum strain at any location. This paper explores the feasibility and reliability of using such an approach, with an existing operating pipeline, which was installed using zero-radius bend (ZRB) initiator structures, used for comparison. Survey data of the pipeline profile and seabed bathymetry are adopted along with the pipe-soil interaction (PSI) inputs from the original design allowing a like-for-like comparison of the two approaches to management of lateral buckling. The comparison shows that, for the assumptions made in the numerical modelling, use of a pre-deformed pipeline results in lower strain than using ZRBs. Furthermore, the performance of the pre-deformed pipeline is robust, and shown to be unaffected by uncertainties in horizontal out-of-straightness, PSI input and seabed features. This study shows that pre-deformed pipelines can be an effective alternative for controlling the lateral buckling of subsea pipelines, which eliminates the need for buckle initiation structures to be installed along the pipeline route. This provides impetus for further work on installation methodologies to create the required level of pre-deformation.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"314 ","pages":"Article 119657"},"PeriodicalIF":4.6,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0