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16 September 2025, Volume 12 Issue 3 Previous Issue   

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Design of Ship Model Resistance Experiment Platform SHI Kunpeng, ZHENG Yuxing, TIAN Yutao, et al 2025, 12 (3):  1-10.  DOI: 10.12087/oeet.2095-7297.2025.03.01 Abstract ( 9 )   PDF (3698KB) ( 1 )   The study of hull resistance is of great significance to the dynamic characteristics of the hull. Currently， there are more than ten large and small towing tank experimental platforms in China. For undergraduate students majoring in marine engineering， studying the resistance characteristics of the hull is of great importance to their professional knowledge learning. However， the construction cost of towing tanks is too high and cannot provide a good platform for undergraduate students to use. An easy-to-implement experimentalplatform construction plan， covering modelship building, platform design and resistance-accuracy verification， offers valuable learning and experimental experience for undergraduates. Related Articles | Metrics

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Exhibition of Modern Model Making Technology Based on the Model Making of 093 Nuclear Submarine SHOU Hai, TIAN Yutao, ZHANG Shutian, et al 2025, 12 (3):  11-21.  DOI: 10.12087/oeet.2095-7297.2025.03.02 Abstract ( 6 )   PDF (6851KB) ( 1 )   Taking the 093 model production as a starting point, this paper conducts an in-depth analysis of modern model making technologies. Through a detailed elaboration of the production process of 093 nuclear submarine model， including precise digital design using 3D modeling software in the early stage to determine the accurate proportion， suitable size and select appropriate materials， the use of 3D printing technology for rapid prototyping and fine model manufacturing， and the later processing procedures such as surface cleaning， polishing and coating protection， the characteristics and advantages of modern model-making techniques in digitalization， automation， material application and fine processing are comprehensively demonstrated. At the same time， the key role of this technology in improving the efficiency of model production， enhancing the reducibility and precision of models， as well as its application prospects and development trends in the field of model making are discussed， providing a useful reference for in-depth understanding of modern model-making techniques. Related Articles | Metrics

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Design and Fabrication of a Compact Brushed Electromagnetic Catapult Based on Halbach Array ZHANG Shutian, GUO Sixing, LI Jiaqiang, et al 2025, 12 (3):  22-29.  DOI: 10.12087/oeet.2095-7297.2025.03.03 Abstract ( 4 )   PDF (7220KB) ( 1 )   A compact brushed electromagnetic catapult was designed and fabricated， with focused analysis on its operational principle， structural design， and performance parameters. By investigating the electromagnetic driving characteristics of the catapult system， the key factors influencing launch efficiency are explored. Additionally， the advantages of the system in high-precision control and energy conversion efficiency are experimentally validated. The results demonstrate that the proposed electromagnetic catapult exhibits rapid response speed， high reliability， and ease of maintenance. This work provides a reference for the miniaturized design of future electromagnetic catapult systems. Related Articles | Metrics

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Vertical-lay Technology and Application for Ultra-Deep Water Flexible Flowline WANG Zhifeng, XUE Dazhi, FU Wenzhi, et al 2025, 12 (3):  30-38.  DOI: 10.12087/oeet.2095-7297.2025.03.04 Abstract ( 4 )   PDF (10497KB) ( 1 )   Flexible flowline is an important part of offshore oil and gas development， and its offshore installation is the core ability and key technology of offshore engineering companies. Based on China's first self-developed 1500m ultra-deep water Lingshui 17-2 gas field， and the domestic first 3000m-class deep-water MSV “Hai yang Shi You 286”， the installation feasibility of 1500m water depth flexible flowline by vertical-lay method for “HYSY 286” is evaluated. The key technology and solution of vertical-lay of ultra-deep water flexible flowline are studied. Through the engineering application in Lingshui 17-2 gas field， the feasibility of the relevant technology is verified， and the gap in domestic technology field is filled， and the technical reserve and experience are provided for the installation of deep water flexible flowline in the future. Related Articles | Metrics

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Mechanical Characteristics of Deepwater Riserless Mud Return Line Under Internal Flow Induced Excitation YIN Zhiming, LI Zhong, WU Di, et al 2025, 12 (3):  39-50.  DOI: 10.12087/oeet.2095-7297.2025.03.05 Abstract ( 4 )   PDF (7734KB) ( 1 )   The mud return line is the key equipment of deepwater riserless drilling system. It is filled with high flow velocity mud， and the mechanical characteristics of mud on the line are not clear. The mechanical model of the mud return line under the combined action of internal and external flow was established by using the microelement method， considering the internal flow inertia force， friction force， centrifugal force and Coriolis force. The numerical model was established by using the finite element method， and the solver developed by Newmark-β method and MATLAB. The single effect and the combined effect of the internal flow force are analyzed， and the influence of mud flow rate， mud density and other factors on the internal flow mechanical characteristics is also studied. The result shows that the inertia force increases the vibration amplitude of the return line， riction decreases the lateral displacement of the return line， centrifugal force and Coriolis force increase the lateral displacement of the return line. The internal flow force has great influence on the return line， and the friction force has the greatest influence on the mud return line. The effects of inertia force， Coriolis force and centrifugal force are small. The effect of internal mud on the return line should be considered in the actual engineering analysis. Related Articles | Metrics

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Research on Installation Technology of Composite Cables for Newly Constructed Deepwater Jackets WANG Minfeng, WEI Xumin, XU Long, et al 2025, 12 (3):  51-57.  DOI: 10.12087/oeet.2095-7297.2025.03.06 Abstract ( 4 )   PDF (11076KB) ( 1 )   Offshore pile foundation fixed oil platforms are the main structural form of offshore oil production in China. At present， the tension type external current cathodic protection technology has become the main technical means of cathodic protection for offshore pile foundation fixed jacket platforms. The newly built jacket platform adopts the method of installing a tensioned composite cable electrode system on land， but facing the design height of 338 meters of jacket， it is a huge challenge to install a composite cable about 340 meters long and weighing about 3.5 tons during its horizontal construction process， and there are no relevant research results or industry experience to draw on. In order to solve this problem， this article proposes a static sliding cable composite cable installation method for installation testing. Based on mechanical calculations and 3D simulation， video monitoring， and dynamic monitoring of the actual process of the composite cable， the actual monitoring data is comprehensively compared with theoretical calculation data and onsite test data. The focus is on studying the stress state of the steel wire rope sliding cable and traction steel wire rope during the installation process of the composite cable， the local deflection and overall deflection of the composite cable， and the change law of the composite cable motion posture during the installation process， to verify the feasibility of the impressed current cathodic protection （ICCP） composite cable sliding cable installation scheme for deepwater horizontal jackets. Related Articles | Metrics

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Study on the Internal Detection Method of a Platform Riser in the South China Sea CAO Juhang, YU Yuanfang, ZHANG Jie, et al 2025, 12 (3):  58-66.  DOI: 10.12087/oeet.2095-7297.2025.03.07 Abstract ( 4 )   PDF (8592KB) ( 1 )   Based on the background of the internal inspection project of a 12.75-inch production riser on a South China Sea platform， the standards and specifications for pipeline internal inspection were systematically organized. The inspection objectives， methods， precision， and parameters for evaluating the remaining strength of corrosion were established. Using ultrasonic internal inspection equipment， a comparative analysis was conducted between the conventional in-line inspection method based on water driving and the pulling through method. It was found that the operation time of the pulling through method was only 23% of that of the water driving method. Based on the preliminary assessment of internal cleanliness and corrosion conditions obtained through pipeline CCTV system， the ultrasonic pulling through internal inspection solution was employed to conduct wall thickness testing and corrosion evaluation of the offshore riser， identifying defect information where corrosion depth exceeded 10% of the wall thickness. According to the corrosion evaluation index of ASME 31G， the estimated repair factor of the riser defect location was obtained， and a riser repair plan was formulated， providing a reference for subsequent similar inspections. Related Articles | Metrics

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Design of Optical Fiber Communication System for Subsea Production System Based on Ring Topology ZHANG Yan, SUN Qin 2025, 12 (3):  67-72.  DOI: 10.12087/oeet.2095-7297.2025.03.08 Abstract ( 4 )   PDF (3580KB) ( 1 )   An optical fiber communication system based on ring topology is proposed for the development of subsea oil and gas fields reconnecting to the existing facilities with limited resources reserved fiber cores， which is based on the efficient utilization rate of optical fiber resources and the superior scalability of topology based on ring topology， and only 4-core fibers are needed for a single loop， which can effectively solve the problem of limited optical fiber resources， and the system has superior expansion ability. Then， the scheme design of the system is carried out， and the standards and methods of the communication verification and practical application case are given， Finally， based on the characteristics of different projects of the subsea production system， the applicability of the star topology and the ring topology is analyzed， which provides a reference for the communication scheme design of the subsea production system. Related Articles | Metrics

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APS Migration Studies in Large Marine Structures LI Wenwu, LIU Xiuhong, QIAN Peng, et al 2025, 12 (3):  73-78.  DOI: 10.12087/oeet.2095-7297.2025.03.09 Abstract ( 4 )   PDF (8709KB) ( 1 )   To address the bottleneck issues of high skidway resource occupancy and poor project scheduling flexibility in traditional skidway traction methods for 10000-ton-class deepwater oil and gas platform modules， this study introduces the mature skidway-free air pad sliding （APS） transportation technology from the shipbuilding industry. Based on application practices in South Korean shipyards， a technical solution integrating air-cushion suspension and hydraulic propulsion systems was systematically developed. By incorporating multi-stage hydraulic jacking devices and path control systems， millimeter-level precision transportation of modules weighing up to 30000 tons was achieved. Engineering validation demonstrated that the APS system reduced skidway resource requirements by 100%， improved project scheduling flexibility by 60%， and shortened transportation cycles by 40%. This research represents the first successful adaptation of APS technology to the offshore engineering sector， establishing a comprehensive skidway-free construction and transportation methodology. The findings provide an innovative solution for China's deepwater oil and gas equipment construction， effectively overcoming the rigid dependence on skidway resources for ultra-large structure transportation. Related Articles | Metrics

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Safety Management of Work at Height in Offshore Engineering Manufacturing Industry LUO Mengran, WANG Qinggong, YU Minggan 2025, 12 (3):  79-86.  DOI: 10.12087/oeet.2095-7297.2025.03.10 Abstract ( 6 )   PDF (9952KB) ( 1 )   Due to the specific manufacturing processes in offshore engineering， work at height is highly prevalent， particularly during the assembly phases of large structures such as modules and jackets， where the frequency of work at height and multi-level crossover operations， as well as the potential fall height， are continuously increasing. This paper provides a classified review of current domestic and international research on work-at-height safety. It systematically examines the definition and identification criteria of work at height and proposes comprehensive preventive measures based on domestic and international regulatory standards and engineering practices. These measures encompass multiple aspects， including engineering technology， management， personnel， and physical protection. To ensure the inherent safety of scaffolding， the paper discusses different types of scaffolding and their selection during construction， aiming to provide a safety management framework for work at height in the offshore engineering manufacturing industry. This framework is designed to effectively reduce accident rates and ensure operational safety. Related Articles | Metrics

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Simulation and Experimental Study on Yawing Motion Characteristic for Single-Anchor Mooring Ships CHEN Pengyu, ZHU Yiming, XIE Xiaomin 2025, 12 (3):  87-93.  DOI: 10.12087/oeet.2095-7297.2025.03.11 Abstract ( 7 )   PDF (6276KB) ( 1 )   The numerical simulation and model test study is conducted on yawing motion characteristic for the 40000 DWT bulk carrier under the combined conditions of wind， wave and current cases. This research analyzed the response of yawing motion and maximum cable tension of anchor chains. Sea condition and length of anchor chains could have influence on them. The test results can provide important technical reference for the safety mooring of single anchored ships. Related Articles | Metrics

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Economic Analysis of Green Hydrogen and Its Derivatives Production Technology Based on Offshore Wind Power SHEN Qi, LIU Chao, LI Ouping, et al 2025, 12 (3):  94-101.  DOI: 10.12087/oeet.2095-7297.2025.03.12 Abstract ( 6 )   PDF (3148KB) ( 1 )   As the global energy structure transforms and the “dual-carbon” goals are set， green hydrogen is gaining importance as a clean energy source in the petroleum refining industry. This study comprehensively assesses the technical and economic viability of producing green hydrogen， methanol， and ammonia using offshore wind power. By calculating the costs of hydrogen production， methanol synthesis， and ammonia synthesis under varying electricity costs， the study analyzes how electricity prices affect the economic viability of green hydrogen and its derivatives. The results indicate that when the electricity cost is 0.35 yuan per unit， the current alkaline electrolysis hydrogen production technology yields a hydrogen cost of 24.66 yuan/kg in the scenario of offshore wind power and onshore hydrogen production， with methanol and ammonia production costs of 5457.55 yuan/ton and 4999.43 yuan/ton， respectively. The study emphasizes that electricity cost is the key factor influencing economic viability. Reducing renewable energy electricity costs and enhancing electrolysis efficiency are crucial for boosting the competitiveness of green hydrogen and its derivatives. Finally， the article proposes suggestions for the coordinated development of policies， technologies， and industries to promote the industrialization of green hydrogen and its derivatives. Related Articles | Metrics

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Application of an Energy-Aware A* and APF Hybrid Algorithm in Collision Avoidance Path Planning for Autonomous Buoys WANG Bo, WANG Lei, JIANG Weidong 2025, 12 (3):  102-111.  DOI: 10.12087/oeet.2095-7297.2025.03.13 Abstract ( 4 )   PDF (14390KB) ( 1 )   The emergence and development of mobile aids to navigation （MAtoN） have a promoting effect on the progress of maritime science and technology. As a type of MAtoN， autonomous buoys have great development prospects. However， due to energy constraints， autonomous buoys must minimize energy consumption as much as possible during navigation to extend their working cycle. Therefore， a path planning algorithm that can be more energy-efficient is needed. This paper proposes a hybrid algorithm of energy-aware A* and artificial potential field （APF）. The global path planning of autonomous buoys is carried out by using the energy-aware A* algorithm. Based on the traditional A* algorithm， the energy perception ability is added， an energy consumption model is established， then a route with lower energy consumption is planned， and a time costiten is introduced to control the navigation time of the autonomous buoy. The APF algorithm is added for local motion planning to locally control the motion path of the autonomous buoy and avoid collisions. This paper verifies the superiority of the energy-aware A* algorithm through simulation. By introducing the APF algorithm， a hybrid planning algorithm is formed， achieving real-time collision avoidance planning for autonomous buoys. Most of the existing A*-APF hybrid algorithms are designed for robots， unmanned surface vehicles， etc.， and are not suitable for the actual path planning of autonomous buoys with strong energy limitations. In contrast， this hybrid algorithm emphasizes energy-aware ability and is more suitable for application in the actual path planning of autonomous buoys. The application of this algorithm in the design of autonomous buoys can promote the development of autonomous buoy applications and has positive significance for enhancing maritime scientific and technological strength. Related Articles | Metrics

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Study on RSV Ethane Liquefaction Process for Preventing CO2 Freezing and Plugging SU Tianshui, SHEN Peng, JI Aoqi, et al 2025, 12 (3):  112-117.  DOI: 10.12087/oeet.2095-7297.2025.03.14 Abstract ( 7 )   PDF (4249KB) ( 1 )   A natural gas processing plant with a capacity of 6×106m3/d plans to adopt the recycle split-vapor （RSV） process to recover liquefied ethane. CO2 freezing and plugging in the demethane tower is a key technical bottleneck affecting the stable operation. With the goal of improving the ethane yield， according to the selection of liquefied ethane process for natural gas production and the formation mechanism of CO2 freeze blockage， the CO2 distribution and temperature of each tower plate of each tower plate under different CO2 contents were simulated. Through the simulation curve comparison analysis， the conclusion was concluded that when the CO2 content of the raw gas in the cold box was less than 5×10-5， the demethanizer would not freeze blockage. According to the analysis of different decarbonization processes， the alcohol amine method is selected to remove CO2 to meet the process requirements. The research results show that by using PZ+MDEA solution to remove CO2 from raw natural gas， the problem of freezing and blocking of CO2 in the deep cold zone between -90℃ and -105℃ can be effectively solved， and the ethane yield can reach more than 95%. Related Articles | Metrics

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Discussion on Regular Inspection Technologies for Submarine Pipelines SU Tianshui, LIAO Hengjie, HUANG Panyang 2025, 12 (3):  118-122.  DOI: 10.12087/oeet.2095-7297.2025.03.15 Abstract ( 4 )   PDF (5619KB) ( 1 )   Subsea pipelines are critical infrastructure for transporting offshore oil， gas， and other resources， and their safety is vital to the marine economy and environment. This paper provides an overview of the construction and inspection status of subsea pipelines along the coast of Zhejiang Province， with a focus on external pipeline inspection technologies and methods. Taking the key area of Huibieyang in Zhejiang as an example， it analyzes and highlights that pipeline inspection should be tailored to different marine environments. Related Articles | Metrics

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Research on the Identification of Technological Opportunities in Marine New Materials in China LIU Hongyu, WU Dajian 2025, 12 (3):  123-127.  DOI: 10.12087/oeet.2095-7297.2025.03.16 Abstract ( 4 )   PDF (4127KB) ( 1 )   This study explores technological opportunities in China's marine new materials field based on patent mining. Patent data were analyzed across trends， authorization， regions， and lifecycle， and keyword clustering was used to identify hotspots. Results show the field is transitioning from growth to maturity， focusing on composites， molding， and green materials， with future directions in intelligent and multifunctional systems. Strategic suggestions are proposed to guide innovation and planning. Related Articles | Metrics

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Analysis of the Influence of Vibration-Blocking Mass on Vibration Transmission Performance of Marine Auxiliary Machinery MAO Liang, SHOU Jianlin, LIU Xuchen 2025, 12 (3):  128-131.  DOI: 10.12087/oeet.2095-7297.2025.03.17 Abstract ( 4 )   PDF (3729KB) ( 1 )   Adding a blocking mass between the base web and the deck surface is an effective means to curb the transmission of ship auxiliary machinery vibration to the hull structure. This study aims to investigate the vibration transmission of auxiliary pumps， focusing on the blocking mass as the research object. The finite element method was employed to systematically analyze the influence of parameters such as the geometric characteristics， material properties， and structural configuration of the blocking mass on the vibration transmission of marine auxiliary machinery. Simulation results demonstrated that increasing the size of the blocking mass and adopting a rational configuration can both significantly reduce vibration transmission. Considering the requirement for lightweight design， a novel squareframe-shaped blocking mass structure is proposed. Related Articles | Metrics

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Mapping the Research Frontiers of Global Marine Engineering (2015-2024): A Journal-Based Knowledge Graph Approach PAN Fei, WANG Xiaolong, CAI Yunze, et al 2025, 12 (3):  132-144.  DOI: 10.12087/oeet.2095-7297.2025.03.18 Abstract ( 7 )   PDF (3336KB) ( 2 )   Ocean engineering serves as a cornerstone for maritime power strategies and global sustainable development. To systematically reveal the research landscape, innovation entities, and frontier evolution in global ocean engineering, this study conducts an in-depth analysis of 37889 publications from 2015 to 2024 based on the Web of Science Core Collection, employing bibliometric methods and knowledge graph analysis. The findings demonstrate: ① A fundamental shift in the global research center of gravity has occurred, with China emerging as the world's primary innovation contributor across key indicators including publication volume and citation impact—its annual publication share surged from 20.9% in 2015 to 60.1% in 2024; ② Innovation entities exhibit highly clustered characteristics, with leading Chinese universities such as Harbin Engineering University and Shanghai Jiao Tong University monopolizing the top 10 global institutional rankings, forming world-class “academic highlands”; ③ Through keyword co-occurrence and cluster analysis, seven frontier themes were identified, including marine renewable energy development, intelligent autonomous marine systems, highfidelity multi-physics simulation, and marine environmental sensing and data science, revealing that the field is being profoundly reshaped by trends of “intelligentization” “decarbonization” and “high-fidelity modeling”; ④ The journal influence landscape has been restructured, with the Chinese-hosted Journal of Ocean Engineering and Science achieving the highest impact factor (11.8) in the field, though platforms for global dissemination of top-tier research require further expansion. Finally, this study establishes a framework for modern ocean engineering frontiers centered on “sustainable & intelligent ocean engineering” supported by “three foundational pillars” and driven by “four enabling engines”. The research reveals China's historic transition from “follower” to “leader” in ocean engineering, provides researchers with a clear developmental roadmap, and profoundly elucidates the strategic urgency of building world-class scientific journals to secure academic discourse power and enhance national scientific soft power. Related Articles | Metrics