Ocean Engineering最新文献_第4页

Multiple optimal solutions in synthesis, design and operation optimization of a marine energy system with the differential evolution algorithm

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-04-01 DOI: 10.1016/j.oceaneng.2025.121064

Florian Dugast , Stéphane Bénac , Pierre Marty , Pascal Chessé

{"title":"Multiple optimal solutions in synthesis, design and operation optimization of a marine energy system with the differential evolution algorithm","authors":"Florian Dugast , Stéphane Bénac , Pierre Marty , Pascal Chessé","doi":"10.1016/j.oceaneng.2025.121064","DOIUrl":"10.1016/j.oceaneng.2025.121064","url":null,"abstract":"<div><div>This article deals with the optimization of a ship energy system on multiple levels (synthesis, design and operation). These complex problems often induce many local optima, making it difficult to obtain reliable optimization results. A clustering method based on the absence or presence of components in the architecture coupled with an evolutionary algorithm (i.e Differential Evolution) is proposed to tackle this issue. The method enables multiple optimal solutions to be identified for a real-world optimization problem. The reference ship for this study is a destroyer but the use of the Admiralty coefficient in the model description makes the algorithm easily adaptable for any kind of ships. The specific fuel consumption is pre-calculated for groups of components to alleviate the computational cost of the optimization problem. Two numerical cases are computed representing the ship energy system with or without a heat recovery and a heat creation system to illustrate the capabilities of the method. The objective in both cases is to minimize the weight of the ship (fuel consumption + components weights) for a given mission profile. The influence of the clustering technique, population size and repeatability of the differential algorithm is also investigated to assess the reliability of the method.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121064"},"PeriodicalIF":4.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746510","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

Development and experimental validation of anti-entanglement equipment for autonomous underwater vehicle

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-31 DOI: 10.1016/j.oceaneng.2025.121087

Xinxin Wei , Jixin Liu , Tianhong Yan , Shulin Liu , Bo He , Tao Sun

{"title":"Development and experimental validation of anti-entanglement equipment for autonomous underwater vehicle","authors":"Xinxin Wei , Jixin Liu , Tianhong Yan , Shulin Liu , Bo He , Tao Sun","doi":"10.1016/j.oceaneng.2025.121087","DOIUrl":"10.1016/j.oceaneng.2025.121087","url":null,"abstract":"<div><div>As the most important component of an autonomous underwater vehicle (AUV) propulsion system, the propeller directly influences AUV navigation safety. To address the issue of potential entanglement with underwater debris, such as water weeds, fishing lines, cables, and other obstacles in complex marine environments, a novel AUV obstruction removal technology based on underwater vision is proposed. Based on the Reynolds-averaged Navier-Stokes (RANS) solver and the SST <span><math><mrow><mi>k</mi><mo>−</mo><mi>ω</mi></mrow></math></span> turbulence model, this study investigates winding disposal technology using the hinge escape strategy. Winding sensing and disposal components are developed, and navigation technology and equipment capable of escaping windings are designed through computational fluid dynamics (CFD) simulations and experimental verification. Experimental verification involving multiple entanglement cutting trials was implemented. The developed cutter configuration demonstrated a consolidated success rate surpassing 96 % across all test groups. This component does not require an additional energy supply, which not only does not affect the hydrodynamic performance of the propeller but also improves the AUV's autonomous survivability in complex marine environments. This is of great significance for enhancing the performance and reliability of the AUV in challenging underwater conditions.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121087"},"PeriodicalIF":4.6,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746512","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 the dynamical behavior of air-dropped underwater profiler and virtual mooring strategy for variable pitch angle

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-31 DOI: 10.1016/j.oceaneng.2025.121053

Dingze Wu , Rui Zhou , Qingchao Xia , Puzhe Zhou , Xin Zhang , Zhilan Jin , Yang Zhang , Canjun Yang

{"title":"Research on the dynamical behavior of air-dropped underwater profiler and virtual mooring strategy for variable pitch angle","authors":"Dingze Wu , Rui Zhou , Qingchao Xia , Puzhe Zhou , Xin Zhang , Zhilan Jin , Yang Zhang , Canjun Yang","doi":"10.1016/j.oceaneng.2025.121053","DOIUrl":"10.1016/j.oceaneng.2025.121053","url":null,"abstract":"<div><div>To meet the operational needs for small-scale, long-term observation and rapid deployment in distant marine environments, the first set of Switchblade Air-dropped Profiler (SAP) with virtual mooring capabilities worldwide has been proposed. The SAP conforms to the A-size standard and when paired with the corresponding air-dropped components, can transition between various operational forms, including folding into a compact barrel shape, air-dropping with a parachute, and spreading wings after entering the water. As a novel type of specialized underwater vehicle, the SAP has undergone miniaturization, lightweight, and folding design, which impose certain constraints on its movement capabilities. The concept of ocean current velocity stratification has been introduced to enhance the ability to correct positional offsets caused by ocean currents. By proposing a current velocity scale factor, the depth-averaged ocean current velocity is divided into low velocity in deep-water areas and high velocity in shallow-water areas. Gliding with different pitch angles within different current velocity layers can maximize the characteristics of decreasing current velocity with increasing depth and improve the efficiency of displacement correction. This strategy termed the variable pitch angle virtual mooring strategy, has been demonstrated to be effective through both kinematic simulations and lake trials.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121053"},"PeriodicalIF":4.6,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746514","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 grid-based method for unsupervised speed pattern recognition using AIS data

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-31 DOI: 10.1016/j.oceaneng.2025.121050

Penghao Li, Qinyou Hu

{"title":"A grid-based method for unsupervised speed pattern recognition using AIS data","authors":"Penghao Li, Qinyou Hu","doi":"10.1016/j.oceaneng.2025.121050","DOIUrl":"10.1016/j.oceaneng.2025.121050","url":null,"abstract":"<div><div>Accurate identification of speed patterns is crucial for detecting abnormal vessel behavior and constructing maritime shipping networks, making it essential for ship movement pattern recognition. However, speed patterns have received limited attention in current research. This paper proposes a grid-based speed pattern recognition method to identify speed patterns from massive AIS data. The approach includes trajectory quality improvement, spatial grid mapping, and two-level clustering. Additionally, a nonparametric testing strategy is employed to verify potential speed limit patterns. We applied the method to AIS data from 2022 near the Suez Canal, extracting speed patterns and revealing possible speed limit rules. Although service speeds differ among container ships, bulk carriers, natural gas/liquefied petroleum (LNG/LPG) carriers, and oil/chemical carriers, the speed patterns of these four ship types in the canal are similar, indicating they are affected by the speed limit rules. Further statistical inference confirms the method’s effectiveness in identifying such patterns without prior knowledge of the waterway. Compared with traditional approaches, the proposed method converts complex AIS trajectories into interpretable speed patterns through grid-based processing and multi-stage clustering. This not only broadens maritime motion pattern research but also provides valuable references for pattern mining, speed limit recognition, and navigation optimization.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121050"},"PeriodicalIF":4.6,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746378","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

Performance study and shape design of pile legs of offshore structures with high-performance free surface flow simulations

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-31 DOI: 10.1016/j.oceaneng.2025.121033

Wei Sun , Rongliang Chen

{"title":"Performance study and shape design of pile legs of offshore structures with high-performance free surface flow simulations","authors":"Wei Sun , Rongliang Chen","doi":"10.1016/j.oceaneng.2025.121033","DOIUrl":"10.1016/j.oceaneng.2025.121033","url":null,"abstract":"<div><div>This study uses high-performance free surface flow simulation algorithms to investigate the interaction between different pile leg models and waves, focusing on the effects of spacing ratio and incident angle on the wave run-up and wave forces under both regular and irregular wave conditions. We compared the cylindrical, triangular, and rounded triangular prism models to identify the optimal design. Detailed numerical simulations were conducted on square arrays of rounded triangular prisms and traditional cylindrical models. The results demonstrate that the rounded triangular prism significantly reduces the wave run-up and wave forces compared to traditional cylindrical structures. The spacing ratio has a more pronounced impact on the wave run-up and wave forces than the incident angle. By adjusting both the incident angle and spacing ratio, the wave run-up and wave forces can be effectively reduced. Additionally, the harmonic component analysis revealed that, under regular waves, the fluid state between columns is more stable at an incidence angle of <span><math><mrow><mi>β</mi><mo>=</mo><msup><mn>90</mn><mo>∘</mo></msup></mrow></math></span> compared to <span><math><mrow><mi>β</mi><mo>=</mo><msup><mn>0</mn><mo>∘</mo></msup></mrow></math></span>. These results enhance the understanding of the dynamic interactions between structures and waves, providing valuable insights and offering both theoretical and practical references for engineering design and marine projects.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121033"},"PeriodicalIF":4.6,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746511","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

Reinforcement mechanism and effect of self-compacting expansive piles on calcareous sand foundations

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-31 DOI: 10.1016/j.oceaneng.2025.121051

Ruihong Wang , Ruhao Li , Hui Wang , Hao Luo

{"title":"Reinforcement mechanism and effect of self-compacting expansive piles on calcareous sand foundations","authors":"Ruihong Wang , Ruhao Li , Hui Wang , Hao Luo","doi":"10.1016/j.oceaneng.2025.121051","DOIUrl":"10.1016/j.oceaneng.2025.121051","url":null,"abstract":"<div><div>The bearing capacity of calcareous sand foundations is lower than that of conventional sand foundations. This approach may be an effective method to reinforce calcareous sand foundations with expansive piles. To study the reinforcement effect and reinforcement mechanism of self-compacting expansion piles on a calcareous sand foundation, the evolution laws of the radial and circumferential expansion stresses of expansive piles and the influence of the pile side distance under different expansive agent contents were studied via model tests. A theoretical model for predicting the attenuation law of expansion stress transfer was established. The discrete element numerical model and field pile foundation bearing tests were used to verify the effect of improving the bearing capacity. The results demonstrate that the expansion stress develops through three distinct phases: rapid growth, slow fallback, and finally stabilization. The stress intensity decreases with increasing distance from the pile side and increases with increasing amount of expansive agent. At the same distance, the radial stress is 3 times greater than the circumferential stress. The expansive pile reinforces the foundation through three different mechanisms: compacting the foundation around the pile, penetrating and reinforcing calcareous sand particles around the pile, and increasing the bearing area of the pile end. In the presence of 15 % expansion agent doping, the maximum increase in the ultimate bearing capacity of the foundation caused by the expansion stress reached 40 %. These findings can serve as valuable reference points for the design and implementation of expansive piles in the context of marine engineering.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143737318","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 and dataset release of a taut-leg mooring system for a semi-submersible floating offshore wind turbine

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-31 DOI: 10.1016/j.oceaneng.2025.121067

Francesco Niosi , Oronzo Dell'edera , Mattia Glorioso , Bruno Paduano , Giuseppe Giorgi , Sebastian Schreier

{"title":"Experimental investigation and dataset release of a taut-leg mooring system for a semi-submersible floating offshore wind turbine","authors":"Francesco Niosi , Oronzo Dell'edera , Mattia Glorioso , Bruno Paduano , Giuseppe Giorgi , Sebastian Schreier","doi":"10.1016/j.oceaneng.2025.121067","DOIUrl":"10.1016/j.oceaneng.2025.121067","url":null,"abstract":"<div><div>In the offshore wind energy field, reducing energy costs involves optimizing and analyzing each system component. A key component influenced by the installation site is the mooring system, which can be designed using various concepts. This study focuses on examining a taut-leg mooring system and its impact on the overall system behavior. Due to a lack of experimental data on taut-leg mooring systems for Floating Offshore Wind Turbines (FOWTs) in the existing literature, our work aims to provide the scientific community with an extensive experimental dataset to validate various numerical models and support the design process of a taut-leg mooring system for a selected installation site.</div><div>The full-scale mooring system was designed, scaled down, and evaluated through experiments at a 1:96 scale using a mooring configuration realized with springs. Springs offer a constant axial stiffness, reflecting the ideal structural behavior. Our paper highlights significant observations for this configuration, even under off-design conditions with modified pre-tension levels. Regular and irregular waves were tested to establish a baseline hydrodynamic response, assess the wind turbine’s impact on the floater, and evaluate operating conditions. An environmental contour (EC) was defined to analyze the system’s behavior in ultimate and accidental limit states. System identification (ID) waves streamlined the characterization process by reducing the number of required waves. Additionally, free decay tests were performed to assess the system’s dynamic characteristics at resonance.</div><div>The analysis of experimental data reveals that pre-tension variations minimally influence the dynamics of the floating structure. Results showed that the tested mooring system exhibits stability during power production and withstands ultimate and accidental limit states.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121067"},"PeriodicalIF":4.6,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746380","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

Monolithic 3D numerical modeling of granular cargo movement on bulk carriers in waves

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-31 DOI: 10.1016/j.oceaneng.2025.121049

W. Düsterhöft-Wriggers, T. Rung

引用次数: 0

On the sensitivity of short design waves for semi-submersible wind platforms

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-31 DOI: 10.1016/j.oceaneng.2025.121054

S.A. Brown, T. Tosdevin, M. Hann, D.M. Greaves

{"title":"On the sensitivity of short design waves for semi-submersible wind platforms","authors":"S.A. Brown, T. Tosdevin, M. Hann, D.M. Greaves","doi":"10.1016/j.oceaneng.2025.121054","DOIUrl":"10.1016/j.oceaneng.2025.121054","url":null,"abstract":"<div><div>Determining ultimate loads and platform motions is essential for both survivability and cost-effectiveness in the development of floating offshore wind. Current design standards utilise time-consuming methodologies that rely on irregular sea state simulations to determine design loads. Design waves offer the potential to accelerate the design process through the simulation of shorter wave profiles that specifically target extreme responses. However, it is not well understood how reliable design waves are for floating devices. Using a mid-fidelity numerical tool, this paper explores the characteristic loads produced by four design wave methods for a semi-submersible floating wind device over a wide range of environmental conditions, using the traditional approach as a benchmark. The results show that for most sea states there is a design wave method that is at least as conservative as the traditional approach. Furthermore, single design waves can be used to identify extreme sea states for more detailed analysis, saving considerable time at the early design stage. Finally, if the most efficient design wave is used for each sea state, there is potential for significant speed up within the design process, but this will rely on being able to reliably identify the method in advance.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121054"},"PeriodicalIF":4.6,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746508","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

Reinforcement learning-based tracking control of autonomous underwater vehicles for seafloor platform data collection

IF 4.6 2区工程技术

Ocean Engineering Pub Date : 2025-03-31 DOI: 10.1016/j.oceaneng.2025.121047

Yang Weng , Sehwa Chun , Yuki Sekimori , Hiroki Yokohata , Takumi Matsuda , Joni Pajarinen , Toshihiro Maki

{"title":"Reinforcement learning-based tracking control of autonomous underwater vehicles for seafloor platform data collection","authors":"Yang Weng , Sehwa Chun , Yuki Sekimori , Hiroki Yokohata , Takumi Matsuda , Joni Pajarinen , Toshihiro Maki","doi":"10.1016/j.oceaneng.2025.121047","DOIUrl":"10.1016/j.oceaneng.2025.121047","url":null,"abstract":"<div><div>Real-time or near real-time access to seafloor platform observations will allow more efficient monitoring of our marine environment in response to possible changes. Data collection from the seafloor remains a time-consuming and costly endeavor due to communication limitations. In response to this challenge, we propose using an autonomous underwater vehicle (AUV) as a commuter vehicle to track the seafloor platform and establish a short-range optical communication link in three dimensions. A reinforcement learning-based tracking controller is trained in a simulated environment to minimize pointing errors and energy consumption during data retrieval. After experimental validation in a simulated environment, we deployed the tracking controller on the actual AUV Tri-TON and conducted sea experiments in Shimoda, Japan. The experimental results show that Tri-TON completed link pointing in 18 s, maintaining the pointing error of distance within 1.10 m, bearing angle error within 10.54<span><math><msup><mrow></mrow><mo>∘</mo></msup></math></span>, and elevation angle error within 1.70<span><math><msup><mrow></mrow><mo>∘</mo></msup></math></span>.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"328 ","pages":"Article 121047"},"PeriodicalIF":4.6,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746513","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