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New Breakthrough in USV Warfare Mode in the Russo-Ukrainian Conflict HU Zhihuan, XIE Wei, LIU Ruonan, ZHANG Weidong Ocean Engineering Equipment and Technology    2024, 11 (1): 18-22.   DOI: 10.12087/oeet.2095-7297.2024.01.03 Abstract （627）      PDF（pc） （698KB）（1095）       Knowledge map    Save In recent years， with the rapid development of technology， the application of USV technology in the military field has gradually become one of the focuses of international military competition. In the Russo Ukrainian War， the USV maritime combat mode has shown new breakthroughs， providing new ideas and possibilities for future maritime operations. This article explores the application value， technical characteristics， and future development trends of unmanned vessels in maritime operations during the Russo Ukrainian War through practical case analysis. The aim is to provide reference and inspiration for research and practice in related fields. Related Articles | Metrics | Comments（0）

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Development of Mooring Connectors and its Application in Floating Offshore Wind Turbine DONG Xin, XU Qun, SHAO Yunliang Ocean Engineering Equipment and Technology    2024, 11 (1): 130-138.   DOI: 10.12087/oeet.2095-7297.2024.01.20 Abstract （330）      PDF（pc） （4193KB）（803）       Knowledge map    Save As a key part of position mooring system， connectors have been widely used for the joining of mooring lines with floating structures or different mooring components. Recently， with the development of floating offshore wind， multiple demonstration projects have been reported worldwide and large scale projects are under planning. The cost must be controlled for the floating wind to realize commercialization by technological innovation， including the mooring system. The mooring connectors have been utilized and verified in the offshore industry for the last several decades and played an important role in connection， installation， maintenance and replacement of mooring system. With the development and flexible application of the mooring connectors， the design， fabrication and installation of floating wind turbine could be significantly improved and the cost of floating wind will be effectively reduced.  Related Articles | Metrics | Comments（0）

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Overview of the Development of Flexible Ocean CTD Sensors LI Jihao1, LIN Guanying2, WANG Nuansheng3, LI Yang3, LI Junyang1 Ocean Engineering Equipment and Technology    2024, 11 (3): 69-77.   DOI: 10.12087/oeet.2095-7297.2024.03.11 Abstract （304）      PDF（pc） （5779KB）（721）       Knowledge map    Save Marine hydrological information plays a significant role in development and exploration of marine resources. Temperature, salinity and depth are fundamental elements of marine hydrology. Monitoring of marine temperature, salinity and depth data plays an important role in the development and utilization of marine resources. The conductivity temperature depth profiler (CTD) is the main instrument for observing seawater temperature and salinity profiles. By using CTD sensors, parameters such as temperature and conductivity of seawater at different depths can be measured. In recent years, flexible electronic sensors have demonstrated great potential for application due to their excellent stretchability and easy attachment, which not only achieve the sensing performance of traditional rigid sensors to a certain extent, but also compensate for the shortcomings of traditional sensors such as large volume and weight. This review introduces the research progress of flexible ocean CTD sensors in recent years, mainly including the working mechanism and classification, common materials, manufacturing processes of flexible sensors, and analyzes the structure, performance, and application platform of existing flexible ocean CTD sensors. Finally, the development of flexible ocean CTD sensors is prospected. Related Articles | Metrics | Comments（0）

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Adaptability Analysis of Offshore New Energy Storage Technology Under Dual-carbon Background SHEN Qi, LI Ouping, LIU Chao, CHENG Guangyuan, YU Xichong Ocean Engineering Equipment and Technology    2024, 11 (1): 106-115.   DOI: 10.12087/oeet.2095-7297.2024.01.17 Abstract （320）      PDF（pc） （1237KB）（585）       Knowledge map    Save This paper sorts out relevant engineering cases at home and abroad， analyzes the advantages and disadvantages of physical energy storage and electrochemical energy storage in offshore applications based on three scenarios: the mandatory requirement of energy storage systems policy for large-scale offshore wind farms， energy storage for improving the penetration of offshore wind power into the grid for integrated development of offshore oil and gas and new energy， and energy storage for off-grid production of green hydrogen， green ammonia， and green methanol. Considering the technology maturity， safety， reliability， compactness， lightweight， economy， and other factors， the most suitable energy storage applied offshorely is still the LFP battery. In the future， considering the superiority of lithium titanate oxide （LTO） batteries in terms of safety， after the cost is reduced， the choice of LTO battery could be considered. But due to the low density of LTO battery， the volume and quality of the equipment are larger than that of LFP battery， and the layout of the offshore platform needs to be further considered. In addition， because there is no single energy storage system that can simultaneously have the characteristics of high power， large energy storage density， reliable safety， and long life cycle， the use of “flywheel+” and “supercapacitor+”hybrid energy storage system is considered， to maximize the shortcomings of a single energy storage method to make up for， to obtain a better performance of the energy storage system. In order to ensure the safety and reliability of new energy storage engineering applications at sea， it is suggested that further research and engineering application of technologies such as the intrinsic safety， safety monitoring and early warning of energy storage under the anti-sloshing conditions of floating facilities at sea should be carried out. Related Articles | Metrics | Comments（0）

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Review on Fuel Selection of LNG and Marine Methanol ZHOU Cheng, ZHOU Yi, LI Meng, SUN Bing, GU Yuxuan Ocean Engineering Equipment and Technology    2024, 11 (2): 12-14.   DOI: 10.12087/oeet.2095-7297.2024.02.03 Abstract （383）      PDF（pc） （973KB）（382）       Knowledge map    Save In view of the high price of LNG and high production and transportation costs， in order to save labor costs and improve economic benefits， Marine methanol fuel is considered to replace LNG fuel. The advantages and limitations of the two fuels are described by comparing their carbon dioxide emissions， costs， management and storage， infrastructure construction， and future development difficulty. Related Articles | Metrics | Comments（0）

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Analysis of Natural Gas Recovery and Reuse Schemes in Offshore Oil and Gas Fields#br# JIN Benling Ocean Engineering Equipment and Technology    2024, 11 (2): 110-115.   DOI: 10.12087/oeet.2095-7297.2024.02.24 Abstract （160）      PDF（pc） （2640KB）（367）       Knowledge map    Save In offshore oil and gas production facilities， oil production platforms account for a high proportion. In the treatment process of offshore oil and gas fields， natural gas mixed with well fluid is carried to the production and treatment process together. After treatment， part of the natural gas is used for fuel gas users or exported， and a considerable part is directly discharged by torch combustion， which causes a lot of air pollution and waste of natural gas energy. How to realize the recovery and reuse of natural gas is the focus of this paper. Therefore， the author analyzes the development of natural gas recovery technology programs in recent years， analyzes several methods of natural gas pressurization， and formulates several natural gas recovery and reuse programs based on the experience summarized in the project. Related Articles | Metrics | Comments（0）

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Application Research of Intelligent Technology in Improving Production Stability and Efficiency on Offshore Oil Platforms WU Binfeng Ocean Engineering Equipment and Technology    2024, 11 (2): 29-33.   DOI: 10.12087/oeet.2095-7297.2024.02.07 Abstract （312）      PDF（pc） （3661KB）（331）       Knowledge map    Save With the continuous development of technology， intelligent technology plays an increasingly crucial role in the operation of offshore oil platforms. This paper begins by introducing the concept and background of intelligent technology in offshore oil platform. Subsequently， it delves into the detailed exploration of the application of intelligent technology in enhancing production stability and efficiency， including predictive maintenance， production process optimization， intelligent monitoring， and datadriven decision support. Finally， the paper summarizes the positive impact of intelligent technology on the production of offshore oil platform. Related Articles | Metrics | Comments（0）

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Research on the Scheme of 3700 Square LPG Carrier YANG Xueli, XIA Huabo, WEI Xiaoqiang, ZHU Yongkai, QI Xiaoliang Ocean Engineering Equipment and Technology    DOI: 10.12087/oeet.2095-7297.2024.02.02 Accepted: 14 October 2024

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Investigation on the Influence of Anchor Chain Length and Weight on the Motion Response of Floating Wind Turbine Platforms SUN Xiang, TIAN Zhenya, ZHU Ronghua Ocean Engineering Equipment and Technology    2024, 11 (1): 59-64.   DOI: 10.12087/oeet.2095-7297.2024.01.10 Abstract （210）      PDF（pc） （3492KB）（265）       Knowledge map    Save Based on an actual engineering project involving a floating scale prototype， this article employs a timedomain analysis method to numerically simulate the transient response of a semi-submersible floating wind turbine platform. It extensively investigates the influence of varying anchor chain length and counterweight mass on the pre-tension of the mooring system and the motion response of the floating platform. The results indicate that the amplitude of pitch， heave， and surge responses of the floating platform initially increases and then decreases with an increase in mooring length. Increasing the mass of the counterweight leads to an initial increase and subsequent decrease in pitch and heave responses， while the surge response initially decreases and then increases. When simultaneously changing both the mooring length and counterweight mass， the counterweight mass does not affect the variation pattern of platform motion response caused by mooring length. Related Articles | Metrics | Comments（0）

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Design Optimization of Waste Heat Recovery Unit for “Hai Yang Shi You 123” FPSO CHEN Qiming, HE Gaolin Ocean Engineering Equipment and Technology    2024, 11 (2): 24-28.   DOI: 10.12087/oeet.2095-7297.2024.02.06 Abstract （226）      PDF（pc） （3344KB）（237）       Knowledge map    Save In order to make full use of the high temperature exhaust gas of the main generator and realize energy saving and emission reduction， the waste heat recovery unit has been designed in the basic design stage in “Hai Yang Shi You 123”FPSO(Floating Production Storage and Offloading)， but the waste heat and the heating medium circulation system of the boiler are completely independent， and can not be mutually standby， and the four heating medium circulation pumps of the waste heat are not connected to the emergency bus， which will lead to the black start of the FPSO. It is easy to cause local high temperature coking and carbonization of heating medium in the furnace tube of waste heat recovery unit， which affects the operation of the system. In order to solve the problem effectively， the scheme of adding the circulating pump of waste heat system into the emergency bus bar is proposed creatively， which can effectively avoid the occurrence of heating medium coking in the waste heat system during black start. Related Articles | Metrics | Comments（0）

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Marine Operation Safety Analysis and Intelligent System Construction YIN Xiaohui, ZHANG Zongchao, QI Gaosheng, DUAN Guoxi, BI Yanbin Ocean Engineering Equipment and Technology    2024, 11 (2): 20-23.   DOI: 10.12087/oeet.2095-7297.2024.02.05 Abstract （207）      PDF（pc） （2004KB）（191）       Knowledge map    Save The development and production of offshore oil have long been accompanied by high operational risks， and the quality of operational safety risk analysis has a direct impact on preventing production safety accidents. The purpose of this article is to introduce the construction practice of China National Offshore Oil Corporation's intelligent system for safety analysis of offshore oil fields， clarify the key points of digital and intelligent construction of oil field safety risk analysis from four aspects： business informatization， resource digitization， data standardization， and business intelligence， analyze the advantages of using intelligent management and analysis systems to improve the safety level of offshore operations， and provide reference for offshore oil field enterprises to explore the path of scientific and technological development. Related Articles | Metrics | Comments（0）

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Design and Application of Crude Oil Export Pumps on Unmanned Offshore Platforms ZENG Yunfei Ocean Engineering Equipment and Technology    2024, 11 (2): 72-75.   DOI: 10.12087/oeet.2095-7297.2024.02.16 Abstract （136）      PDF（pc） （1260KB）（190）       Knowledge map    Save Faced with the unpredictable changes in oil prices， offshore oil and gas production needs to reduce costs and improve economic benefits. Therefore， the unmanned， digital， and intelligent development of offshore oil facilities is the trend. This paper focuses on the design and application of crude oil transport pump on offshore unmanned platform， including process design， important component selection， equipment operation protection function and remote control method， and describes the application management method of crude oil transport pump on unmanned platform， providing reference for the design and application of similar equipment on offshore unmanned platform in the future. Related Articles | Metrics | Comments（0）

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Technical Measures for Energy Conservation and Consumption Reduction of Natural Gas Long Distance Pipeline ZHANG Xiaodong Ocean Engineering Equipment and Technology    2024, 11 (2): 56-58.   DOI: 10.12087/oeet.2095-7297.2024.02.12 Abstract （182）      PDF（pc） （856KB）（189）       Knowledge map    Save With the development of China's economy， new energy sources such as natural gas have been gradually developed and utilized， providing greater strength for China's economic construction. Considering the nature of natural gas， the use of long-distance pipeline is usually involved to ensure the safe and stable transportation of this energy source. By connecting pipelines， the construction of the gas supply system is completed in order to effectively utilize this energy source. However， considering the consumption during transportation， it is necessary to conduct further research on energy-saving and consumption reduction technologies for natural gas long-distance pipelines， reduce energy waste， reduce transportation costs， improve utilization efficiency， and promote the sustainable development of the industry. Related Articles | Metrics | Comments（0）

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FPSO Working Chamber Underwater Detection Device Coupled Motion Response#br# ZHANG Baolei, SUN Bing, ZHANG Hehe, CHEN Xiao, TIAN Guozhi Ocean Engineering Equipment and Technology    2024, 11 (2): 116-122.   DOI: 10.12087/oeet.2095-7297.2024.02.25 Abstract （129）      PDF（pc） （2092KB）（179）       Knowledge map    Save Underwater robots are widely used in ocean engineering and deep-sea exploration. Due to the complex and harsh sea conditions of FPSO operations， the release and recovery of ROV is an important factor affecting its operational capability. We Shcald select the optimal storage and retrieval method based on the characteristics of the homework and the weight of the underwater detection device, collect data on the sea conditions in the target sea area, analyze the motion response of underwater detection devices in the operating sea area, and use the normative method to verify the structural strength of the work cabin in different states. This article takes the implementation of FPSO work cabin in Lufeng 12-3 oilfield as the background. By using AQWA software to establish FPSO and underwater detection device models， the hydrodynamic response analysis of underwater detection devices， ships and their mooring systems is carried out， and compared with experimental values. The simulation analysis and experimental results are close and reliable. Finally， based on the motion amplitude of the underwater detection device under the most dangerous working conditions， the appropriate boom stroke is selected. Related Articles | Metrics | Comments（0）

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Research on Permanent Repair Plan for Submarine Gas Pipeline in the South China Sea ZENG Yunfei, DENG Guanhua, YU Chenglong, ZHU Zejin, ZHANG Guodong Ocean Engineering Equipment and Technology    2024, 11 (2): 106-109.   DOI: 10.12087/oeet.2095-7297.2024.02.23 Abstract （135）      PDF（pc） （2202KB）（171）       Knowledge map    Save Subsea pipeline is the important facility of offshore field. Shutdown and huge lost should come with the damage which happen to the pipeline. The key points， which should be to consider before a subsea pipeline repair work， are operation difficulty， risk， time and schedule. This paper do the study of subsea pipeline repair solutions for the gas field subsea pipeline basing side lifting repair technology and hot-tapping plugging repair technology. The better solution will be confirmed by the analysis and comparison between different solutions. Related Articles | Metrics | Comments（0）

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Discussion on the Solution of Insulation Failure of Underwater Motor on Offshore Platform DENG Guanhua, ZHANG Guodong, YANG Qifu, YANG Sen, CEN Jianfeng Ocean Engineering Equipment and Technology    2024, 11 (2): 15-19.   DOI: 10.12087/oeet.2095-7297.2024.02.04 Abstract （162）      PDF（pc） （2200KB）（171）       Knowledge map    Save Aiming at the problems of high insulation failure rate and unstable quality of domestic electric seawater lifting pump motor. By combining the actual cases and the simulation analysis of temperature field， it is concluded that the main reasons for the insulation failure of submerged water motor include the defect of winding wire selection， insufficient internal heat dissipation， poor sealing performance and lack of temperature monitoring. At the same time， according to the reason of appeal， the feasible improvement method is put forward in order to improve the product quality of electric submersible water pump. Related Articles | Metrics | Comments（0）

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Influence of Sea Condition on Tracking Accuracy and Control Energy Consumption of Unmanned Surface Vessels under Straight Line Navigation YONG Jiuqin1, 2, XUE Zhentao1, 2, CHEN Li1, 2 Ocean Engineering Equipment and Technology    2024, 11 (4): 103-109.   DOI: 10.12087/oeet.2095-7297.2024.04.16 Abstract （127）      PDF（pc） （2226KB）（167）       Knowledge map    Save Adaptability to various sea conditions is vital to unmanned surface vessels (USVs). This paper aims to reveal influence of sea conditions on tracking performance. The USV controlled by PID tuned for the baseline sea condition is studied. A three degree of freedom dynamic model is built， and a new evaluation index of control energy consumption accounting for propeller propulsion and steering mechanism operation is designed other than the conventional tracking accuracy. Simulation results demonstrate the variation trend of the tracking accuracy and control energy consumption with sea conditions under the typical straight line navigation case. The performance is significantly affected under high sea conditions， with root mean square error increasing 188 times up to 158.207m and control energy consumption increasing 3 times up to 46.916 kWh. The quantification of the tracking accuracy and control energy consumption with sea conditions provides reference for the design and control of USVs. Related Articles | Metrics | Comments（0）

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Analysis and Treatment of Abnormal Phenomena of Oilfield Terminal Crude Oil Processing System ZHAO Wei, LI Shaopeng, CAO Zhixing, LIU Rui, QIU Shuang Ocean Engineering Equipment and Technology    2024, 11 (2): 67-71.   DOI: 10.12087/oeet.2095-7297.2024.02.15 Abstract （174）      PDF（pc） （1171KB）（166）       Knowledge map    Save An abnormal oil-water separation occurred in the terminal FPSO crude oil treatment system of an oilfield in Bohai. Through analysis of the process conditions， it was found that the main reasons were a decrease in process temperature， changes in crude oil composition， and waste oil discharge from the upstream closed drain system. In response to the existing problems， targeted measures were taken， such as high-temperature oil well extraction， mixing of two series of crude oils， and optimization of closed drain pump discharge methods. Ultimately， the crude oil treatment effect was improved， ensuring that the crude oil in the lower hold was qualified. Related Articles | Metrics | Comments（0）

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Research on Optimization Strategy of Attack Angle for Wind-assisted Ship Propulsion with Minimum Route Deviation LIN Haoan, CHEN Li Ocean Engineering Equipment and Technology    2024, 11 (1): 1-9.   DOI: 10.12087/oeet.2095-7297.2024.01.01 Abstract （198）      PDF（pc） （5657KB）（166）       Knowledge map    Save The decision on wind sail angle is crucial for effectively harnessing wind energy in windassisted ships. During ship navigation， the wind sail generates both thrust and lateral thrust， causing ship yawing and reduced energy efficiency. To address this problem， this paper introduced a lateral thrust weight factor and established a bilinear angle decision function composed of the thrust coefficient and the lateral thrust coefficient. The function aimed to minimize the deviation angle of the optimal course and utilized the particle swarm optimization algorithm to solve for the optimal weight factor applicable to the specific route. This approach enables achieving optimal sail angles under different relative wind directions， allowing for windassisted ship navigation without relying on steering and avoiding course deviation. Compared to the traditional angle strategy based on the maximum thrust method， the proposed approach results in slight improvement in heading longitudinal displacement within the same navigation time， substantial reduction in sideways displacement and course deviation angle， and smoother angle variations during fluctuations in relative wind direction. These findings are beneficial for wind sail manipulation. This research provides insights to enhance the energy efficiency of wind-assisted ships. Related Articles | Metrics | Comments（0）

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Application Research of Energy Consumption Management System in LF12-3 Oilfiled WU Binfeng Ocean Engineering Equipment and Technology    2024, 11 (2): 43-51.   DOI: 10.12087/oeet.2095-7297.2024.02.10 Abstract （133）      PDF（pc） （7928KB）（145）       Knowledge map    Save This paper mainly discusses the application of energy consumption management system (ECOMS) in LF12-3 offshore oil field. Firstly， the application background of the system is introduced. Then the design principles， system characteristics， architecture and functions of the system are elaborated. Finally， the important role of the energy consumption management system in the dynamic monitoring of production energy consumption and the improvement of energy efficiency of the offshore oil platform is summarized. Related Articles | Metrics | Comments（0）

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Discussion on the Feasibility of Developing Marginal Oil Fields in South China Sea by Jack-up Production and Storage Platform SHI Hemu, FAN Dunqiu, ZHANG Lin Ocean Engineering Equipment and Technology    2024, 11 (2): 87-90.   DOI: 10.12087/oeet.2095-7297.2024.02.19 Abstract （153）      PDF（pc） （1035KB）（143）       Knowledge map    Save The stability of the foundation is crucial for the production safety of jack-up platforms. Firstly， the checking methods of foundation stability in the international standard (ISO 19905-1 and SNAME 5-5A) for in-place analysis of the jack-up platform are introduced， and then an engineering example is introduced to check the foundation stability of the platform. The results indicate that the vertical horizontal bearing capacity and anti-sliding capacity of the foundation at the target operation site meet the requirements of both specifications. Due to the differences in the determination of vertical ultimate bearing capacity in both specifications， there are differences in the vertical-horizontal foundation capacity envelopes， and the verification results according to ISO 19905-1 are more conservative. Related Articles | Metrics | Comments（0）

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Overview of the Development and Design of Dynamic Cable for Floating Offshore Wind Power in China LIN Zeyin, WANG Yibing, LI Dongsheng Ocean Engineering Equipment and Technology    2024, 11 (4): 41-46.   DOI: 10.12087/oeet.2095-7297.2024.04.07 Abstract （114）      PDF（pc） （2023KB）（124）       Knowledge map    Save In recent years, the global offshore wind power has developed rapidly. As nearshore resources become increasingly scarce, offshore wind power has gradually moved to the deeper sea. To accommodate the dynamic characteristics of floating wind turbines, floating platforms must be supported by dynamic cables. This is a comprehensive cable of transmitting electricity and control signals, with constantly changing position and force status, which can withstand the combined effect of wind, wave, current and other natural environment, to ensure the effective transmission of power and monitoring signals. Compared with foreign industries, Chinas dynamic cable industry started later, with the harsh working conditions and the lack of relevant technology. All these factors restrict the progress of the dynamic cable industry. This paper will provide a detailed introduction to the basic principles, current development status, key technologies, and challenges faced by floating wind turbine dynamic cables, summarizing the latest industry information and technology to support the development of Chinas dynamic cable industry. Related Articles | Metrics | Comments（0）

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The Application of the Concept of “Three Original and Three Present” under the “Broken Window Effect” YIN Xiaohui Ocean Engineering Equipment and Technology    DOI: 10.12087/oeet.2095-7297.2024.02.01 Accepted: 14 October 2024

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The Research on the Selection of Anchor Cable Layout for Submerged Floating Tunnels WANG Jinduo, JI Chong, LI Xin, ZHANG Xiantao Ocean Engineering Equipment and Technology    2024, 11 (3): 10-17.   DOI: 10.12087/oeet.2095-7297.2024.03.02 Abstract （148）      PDF（pc） （1894KB）（117）       Knowledge map    Save Submerged floating tunnels(SFTs) are a new type of transportation structure used to cross deep water. To ensure the dynamic stability of SFTs under wave and current loading, an appropriate mooring system is required. This research focuses on submerged floating tunnels with anchor cables and investigates the impact of different anchor cable layouts on the dynamic response of SFTs. Utilizing OrcaFlex software, finite element models are established to analyze the stiffness of mooring systems under both vertical and inclined layouts. The variations in tunnel displacement, acceleration, and anchor cable tension under regular waves and uniform currents are examined. The results show that the inclined anchor cable layout with an inclination angle of 45° and an installation angle of 45° can effectively suppress the vertical and lateral motion response of the tunnel, ensuring structural stability and preventing anchor cable fatigue damage. Furthermore, this layout is applicable to SFTs of different lengths. Related Articles | Metrics | Comments（0）

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Techno-economic Evaluation of Hydrogen Production through Offshore Wind Farms LIU Chao, LI Ouping, CHENG Guangyuan, SHEN Qi, YU Xichong Ocean Engineering Equipment and Technology    2024, 11 (1): 116-121.   DOI: 10.12087/oeet.2095-7297.2024.01.18 Abstract （398）      PDF（pc） （823KB）（102）       Knowledge map    Save Offshore wind resources in deep-water is more abundant and will be one of the main development trends in the next few years. However， offshore wind development faces many challenges such as the power transmission and consumption. It needs new development models and technological innovations to be promoted. Hydrogen production through offshore wind would improve the power system flexibility and safety， and could be used as renewable energy storage to achieve large-scale and long-term storage. Based on the market price and literature， the tech-economic comparison and evaluation are carried of onshore off-grid hydrogen production and offshore hydrogen production with pipeline from the levelized cost of hydrogen and internal rate of return. Based on the whole life cost， the levelized cost of hydrogen production through offshore with pipeline is lower and the CAPEX and OPEX of water electrolysis system have a significant impact on the LCOH. In terms of economy， offshore wind will obtain higher returns than offshore hydrogen production if all electricity could be imported to the power system. Related Articles | Metrics | Comments（0）

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Brief Discussion on Procurement Expediting Management for FPSO Construction Project Yu Yongkun Ocean Engineering Equipment and Technology    2024, 11 (2): 52-55.   DOI: 10.12087/oeet.2095-7297.2024.02.11 Abstract （151）      PDF（pc） （868KB）（92）       Knowledge map    Save The FPSO construction project procurement on schedule is affected by multiple factors. Taking “HYSY 123” FPSO project as an example， this paper briefly analyzes the factors that impact the procurement and delivery， and then introduces the implementation procedures of the project procurement expediting management in detail， and finally summarizes the considerable results achieved by implementing the procurement expediting. It could be adopted as a reference for the subsequent FPSO construction projects. Related Articles | Metrics | Comments（0）

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Application of Inrush Current Suppressor in Power System of Offshore Platform ZHANG Guodong, YANG Sen, YU Chenglong, DENG Guanhua, QIAN Cheng Ocean Engineering Equipment and Technology    2024, 11 (2): 63-66.   DOI: 10.12087/oeet.2095-7297.2024.02.14 Abstract （131）      PDF（pc） （3918KB）（81）       Knowledge map    Save The offshore platform has small space， limited installed capacity of generators， increased load capacity， and increased load rate of transformers. The excitation inrush current during no-load closing of transformers causes a huge impact on both transformers and generators， and can also lead to closing failure. Most products use phase separation operation to control the closing angle and suppress the transformer closing inrush current. However， due to the three-phase linkage of the circuit breakers of the generator and transformer， the actual application effect is not ideal. The Vizimax MVX surge suppressor greatly reduces the amplitude of the surge and harmonic components by measuring and controlling residual magnetism， ensuring the success of each closing， improving power quality， and prolonging the life of core electrical equipment such as transformers and generators. It can provide experience and reference for similar engineering projects in the future. Related Articles | Metrics | Comments（0）

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Application of Positive Motivation in Safety Management of Offshore Oilfield YIN Xiaohui, WANG Jing Ocean Engineering Equipment and Technology    2024, 11 (2): 76-79.   DOI: 10.12087/oeet.2095-7297.2024.02.17 Abstract （149）      PDF（pc） （2141KB）（81）       Knowledge map    Save Due to the high-risk nature of offshore oil fields， safety management has become crucial. A certain oil field in Bohai is a foreign cooperative oil field， which has been operated by foreign parties until 2013， and the construction of safety culture is weak. After the return of oilfield operation rights in 2013， oilfield safety management faced numerous challenges. Oilfield managers have achieved impressive safety performance by adopting a series of effective positive incentive measures to promote the construction of oilfield safety culture and institutional systems. This article analyzes the positive incentive measures taken in the safety management work of a certain oilfield in Bohai， in order to provide reference for the safety management work of other oilfields. Related Articles | Metrics | Comments（0）

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Research on Rack Phase Difference of Truss-type Jack-up Unit CHEN Wei, YAN Ming Ocean Engineering Equipment and Technology    2024, 11 (2): 80-86.   DOI: 10.12087/oeet.2095-7297.2024.02.18 Abstract （181）      PDF（pc） （2419KB）（79）       Knowledge map    Save Rack phase difference may be produced in the process of positioning of truss-type Jack-up unit， which will cause a significant additional bending moment at the contact position between the legs and the main hull of the unit， resulting in buckling failure of the leg support pipe at the low guiding position of the hull. In the paper, a jack-up unit is taken as the research object， ANSYS software and birth-death element technology is used to forecast RPD value of jack-up unit in the process of lifting hull by 3-D time-domain numerical simulation analysis， which is divided into four main stages according to changes of RPD value. On this basis， the RPD variation characteristics under three wind speed conditions are analyzed， which is helpful to determine the impact of wind speed on RPD in the process of lifting hull. Finally， a set of RPD control method is proposed based on the law of the change of RPD and the stress of the leg in order to monitor RPD of platform leg. Related Articles | Metrics | Comments（0）

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Exploration of Underwater Storage Facilities Application Scenarios CAI Wenjuan, CAO Pengwei, ZHAO Ming, ZHOU Qi Ocean Engineering Equipment and Technology    2024, 11 (4): 125-130.   DOI: 10.12087/oeet.2095-7297.2024.04.19 Abstract （124）      PDF（pc） （4331KB）（77）       Knowledge map    Save Underwater storage facilities， leveraging oil-water displacement technology， serve as independent storage units that provide diversified media storage at sea and are essential for the development and utilization of marine energy. This paper analyzes five potential application scenarios for future underwater storage facilities， including the development of marginal oil fields in shallow waters， underwater energy storage technology， underwater methanol and ammonia storage technology， underwater carbon dioxide storage technology， and the storage and injection technology of chemical reagents on the seabed. In marginal oil fields， a combined approach using an integrated processing platform， underwater storage facilities， and shuttle tankers can enhance cost adaptability and the flexibility of storage capacity customization. Underwater energy storage technology (underwater compressed air energy storage and underwater hydrogen storage) is provided for offshore wind platforms to ensure the stability of power transmission and reduce the limitations of storage space on the platform. Offshore wind power can also be converted into methanol and ammonia， by adopting underwater storage solutions. The storage units on the platform can be canceled， thereby reducing overall investment. By installing LCO2 storage facilities underwater instead of storing it on the injection platform， the efficiency of LCO2 storage and its environmental adaptability can be improved. The use of seabed chemical reagent storage and injection technology significantly enhances the safety， cost-effectiveness， and injection accuracy of the chemical reagent system. Related Articles | Metrics | Comments（0）

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Application Status of Joining Technology for Composites in the Ship Field ZHANG Xiaoyu, ZHOU Yiliang, FENG Chong, YAO Lili Ocean Engineering Equipment and Technology    2024, 11 (1): 145-150.   DOI: 10.12087/oeet.2095-7297.2024.01.22 Abstract （155）      PDF（pc） （7989KB）（75）       Knowledge map    Save Fiber-reinforced composites have been widely applicated in the ship fields owing to their characteristics of light weight and high strength. Although the integral forming process is becoming mature， the assembly and joint of the composites is still a challenge. Therefore， improving the mechanical properties of joint is the key to the application of fiber-reinforced composites. This paper introduces the normal joining technology， including mechanical ， adhesive and hybrid joints， which also briefly describes the key points during designing the joint. Finally， the future application of joining technology for fiber-reinforced composites in the ship fields is summarized and prospected. Related Articles | Metrics | Comments（0）

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The Key Technology Research and Application of Subsea Manifold and Foundation LIU Hao, ZHANG Ning, YUAN Qingdong, MAO Jiayou Ocean Engineering Equipment and Technology    2024, 11 (1): 42-48.   DOI: 10.12087/oeet.2095-7297.2024.01.07 Abstract （171）      PDF（pc） （21580KB）（72）       Knowledge map    Save Subsea manifold is the core facility for subsea oil and gas fields development， is capable of gothering， tegulating， and ensurity underwater oil and gas production. It can be designed with different struture and function according the specific requirement of the oil and gas field. Base on the subsea manifold engineering experience in the South China Sea deepwater oil field， performing foundation type， key technology， manifold function module type and new technology application are analysised and researched. This study offers reference and experience for domestic subsea manifold technology and key equipment development. Related Articles | Metrics | Comments（0）

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Analysis of the Characteristics of Offshore Wind Power Operation and Maintenance Technologies and Strategies YU Xichong1, LIU Chao1, LIU Xiaoyan1, LI Zhichuan2, WU Yufei1 LI Ouping1 Ocean Engineering Equipment and Technology    2024, 11 (3): 18-21.   DOI: 10.12087/oeet.2095-7297.2024.03.03 Abstract （248）      PDF（pc） （1382KB）（70）       Knowledge map    Save Based on the characteristics of offshore wind power operation and maintenance in China, this paper analyzes the current situation and development trend of offshore wind power operation and maintenance technology and equipment in China. Taking an offshore wind farm in the South China Sea as a research scenario, this paper proposes a vibration monitoring scheme for offshore wind turbine system, an offshore wind turbine boarding scheme, an offshore wind turbine maintenance and operation and maintenance scheme, and an offshore wind farm inspection scheme, which puts forward guiding significance for the operation and maintenance of offshore wind farms in China. Related Articles | Metrics | Comments（0）

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Current Status and Key of Undersea Junction Technology at Home and Abroad CHEN Yunlong, DENG Dudu, LIU Zhijian, RUAN Hailong, LIANG Tao, LIU Guangzhi, GUO Longchuan Ocean Engineering Equipment and Technology    2024, 11 (1): 90-98.   DOI: 10.12087/oeet.2095-7297.2024.01.15 Abstract （244）      PDF（pc） （45240KB）（68）       Knowledge map    Save Undersea junction technology is one of the core technologies for building a cabled ocean observatory system， which connects multiple devices underwater to manage the power and information. The undersea junction technology started earlier in United States， Japan， Canada and other country， which gradually developed negative high-voltage single-stage DC power transmission， high-power power conversion， underwater wet plug， large-scale optical fiber communication networking and other technologies. Using modular design and multi-level junction box interconnection， large subsea observatory has been built in many sea areas. In the past decade， with the domestic development of offshore ocean observation system， junction box design and high voltage power transmission， remote communication and control technology has developed rapidly， the scientific nodes undersea junction boxes have been successfully applied in a number of sea areas， but has not yet formed a large observatory. Some of the deepwater key components such as underwater wet plug connectors， cables are mainly dependent on imports. While introducing and absorbing foreign advanced technology， the development of high-performance controllers， high-power conversion modules， underwater connectors and photoelectric complex cables will be a very important direction of the future junction boxes. Related Articles | Metrics | Comments（0）

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Application of Inrush Suppression in Offshore Oil Platform HU Zhongliang Ocean Engineering Equipment and Technology    2024, 11 (2): 91-94.   DOI: 10.12087/oeet.2095-7297.2024.02.20 Abstract （147）      PDF（pc） （1113KB）（67）       Knowledge map    Save Inrush current impact on the safe and stable operation of power systems for offshore oil platforms. Because of the protection of their initiation malfunction switch tripping， power shock， It has been very concerned about the problem electrician. This article analyzes the causes of inrush current generated， when the transformer pressure by controlling the magnetic circuit is not saturated to suppress the magnetizing inrush， the suppression strategy is to take points off control switch in the same time in the early phase of the applied voltage， to ensure the presence of residual magnetism magnetic bias offset opening formed after closing. Related Articles | Metrics | Comments（0）

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Research on Development and Adaptability of Subsea Compressor Boosting Technology MENG Yao, HOU Guangxin, LIU Weibin, LIU Yongfei Ocean Engineering Equipment and Technology    2024, 11 (3): 57-62.   DOI: 10.12087/oeet.2095-7297.2024.03.09 Abstract （114）      PDF（pc） （3494KB）（58）       Knowledge map    Save The wellhead pressure of the subsea trees could be reduced dramatically by using subsea compressor technology, thereby increasing the production of the target gas field and achieving better economic benefits. The subsea compressor boosting technology has been increasingly valued and favored by domestic and foreign oil companies in recent years. This paper study on the development of the subsea compressor boosting technology and compare the technology roadmap of different subsea compressor to determine better solution for projects in Nanhai Sea in order to provide reference for future potential subsea compressor boosting project. Related Articles | Metrics | Comments（0）

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China‘s First DP-3 Closed Ring Power System Design of Engineer Ship XU Aijin, XU Weiping, HAN Xuyan Ocean Engineering Equipment and Technology    2024, 11 (3): 36-41.   DOI: 10.12087/oeet.2095-7297.2024.03.06 Abstract （110）      PDF（pc） （4502KB）（56）       Knowledge map    Save In response to a leading vessel design requirement that cooperating DP-3 closed ring power system, this paper introduce an optimize design of a new deep-water diving support vessel of Shanghai Salvage Bureau from the analysis of the thruster configuration, electric load balance and single line diagram, combined with the DP capability assessment. Then, we divide the overall structure and equipment redundancy grouping of the vessel’s closed ring power station on account of “three-engine rooms, four-DP zones” design. Meanwhile, this paper discusses the design of dual feeding power supply for a special separated switchboard and the protection logic during closed ring operation. Related Articles | Metrics | Comments（0）

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Research on Testing Technology of Deep Water Jacket Pile Gripper for Oil and Gas Applications MA Deqiang, LI Nan, WANG Wei, MA Jianqiang, HUA Dongyang Ocean Engineering Equipment and Technology    2024, 11 (1): 37-41.   DOI: 10.12087/oeet.2095-7297.2024.01.06 Abstract （135）      PDF（pc） （3134KB）（55）       Knowledge map    Save The jacket pile gripper is a key equipment for the installation of offshore jacket platforms. It is installed on top of the jacket skirt pile sleeve. During operation， the hydraulic cylinder is driven to clamp the steel pile to ensure the relative fixation between the steel pile and the jacket. If the gripper fails during the installation process of the jacket platform， it will seriously affect the entire offshore installation plan and cause huge economic losses. Therefore， in order to ensure the product quality of the gripper， it is necessary to conduct factory testing of key components of the gripper on land， factory testing after final assembly， and system testing after installation on the jacket platform to verify the functional integrity of the pile clamp. Related Articles | Metrics | Comments（0）

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Optimization Design of Marine cable of Wind Farm Bend Restrictor Based on Neural Network ZHONG Kexing, DING Lesheng, ZHANG Cong, MAO Yandong, CHEN Jinlong Ocean Engineering Equipment and Technology    2024, 11 (1): 70-76.   DOI: 10.12087/oeet.2095-7297.2024.01.12 Abstract （119）      PDF（pc） （10138KB）（49）       Knowledge map    Save China's offshore wind power generation enter the era of affordable grid connection， and all component designs in the industry face the challenge of optimizing design. Bend restrictors are widely used in wind cable protection， and their bending stiffness and Mises peak stress are key indicators in structural design. At present， the optimization design of bend restrictors is mostly based on experience and finite element analysis iteration， which has low efficiency and is difficult to achieve multiobjective optimization. The paper proposes a multi-objective optimization method based on neural networks for the optimization of marine cable of wind farm bend restrictors to address this issue. Firstly， construct an RBF neural network proxy model using samples obtained from orthogonal experimental design and finite element analysis within the given design domain. Furthermore， the non-dominated sorting genetic algorithm Ⅱ （NSGA-Ⅱ） is used for multi-objective optimization of the bend restrictor， and the Pareto optimal solution set is obtained. A feasible multi-objective optimization method is provided for the structural design of the bend restrictor. Related Articles | Metrics | Comments（0）

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Analysis of Wave Slamming Impact on the Launching of Underwater Data Cabin XU Aijin Ocean Engineering Equipment and Technology    2024, 11 (4): 89-94.   DOI: 10.12087/oeet.2095-7297.2024.04.14 Abstract （92）      PDF（pc） （7319KB）（48）       Knowledge map    Save In the process of subsea manifold hoisting and lowering， when the ship-cable-body multi-body coupling system moves greatly due to strong nonlinear environmental load， the cables of the hoisting system will change rapidly from slack to tensioning， resulting in the instantaneous surge of mooring impact tension， which may endanger the safe operation of the system. This article simulates the launching process of the underwater data center through fully coupled dynamic time-domain simulation. It considers the motion of ships and the effects of wind， waves， currents， and wave slamming， especially the impact of waves on the underwater data center when it first enters the water. Sensitivity analysis is conducted on the key parameters of wave slamming， accurately predicting the acceleration and six degrees of freedom of the data center when it enters the water， ensuring the smooth and safe entry of the underwater data center into the water. The research results provide certain theoretical and technical references for the design and offshore installation of underwater data centers in the future. Related Articles | Metrics | Comments（0）