Most Down Articles

Published in last 1 year| In last 2 years| In last 3 years| All| Most Downloaded in Recent Month | Most Downloaded in Recent Year|

Published in last 1 year

Please wait a minute...


For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails

Select

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 （482）      PDF（pc） （698KB）（871）       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）

Select

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 （278）      PDF（pc） （4193KB）（616）       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）

Select

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 （260）      PDF（pc） （1237KB）（423）       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）

Select

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 （325）      PDF（pc） （973KB）（353）       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）

Select

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 （257）      PDF（pc） （3661KB）（267）       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）

Select

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 （148）      PDF（pc） （2640KB）（233）       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）

Select

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 （160）      PDF（pc） （3492KB）（198）       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）

Select

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 （180）      PDF（pc） （3344KB）（188）       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）

Select

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

Select

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 （118）      PDF（pc） （1260KB）（164）       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）

Select

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 （141）      PDF（pc） （856KB）（162）       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）

Select

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 （226）      PDF（pc） （5779KB）（149）       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）

Select

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 （111）      PDF（pc） （2202KB）（142）       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）

Select

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 （141）      PDF（pc） （2200KB）（134）       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）

Select

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 （123）      PDF（pc） （1035KB）（131）       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）

Select

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 （140）      PDF（pc） （1171KB）（129）       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）

Select

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 （117）      PDF（pc） （7928KB）（123）       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）

Select

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 （155）      PDF（pc） （2004KB）（119）       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）

Select

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 （166）      PDF（pc） （5657KB）（108）       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）

Select

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

Select

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 （118）      PDF（pc） （2092KB）（92）       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）

Select

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 （341）      PDF（pc） （823KB）（90）       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）

Select

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 （114）      PDF（pc） （3918KB）（79）       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）

Select

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 （139）      PDF（pc） （2141KB）（73）       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）

Select

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 （131）      PDF（pc） （868KB）（68）       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）

Select

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 （147）      PDF（pc） （21580KB）（65）       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）

Select

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 （132）      PDF（pc） （1113KB）（62）       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）

Select

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 （128）      PDF（pc） （7989KB）（61）       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）

Select

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 （160）      PDF（pc） （2419KB）（60）       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）

Select

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 （99）      PDF（pc） （1894KB）（59）       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）

Select

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 （189）      PDF（pc） （1382KB）（58）       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）

Select

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 （186）      PDF（pc） （45240KB）（56）       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）

Select

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 （105）      PDF（pc） （10138KB）（48）       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）

Select

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 （111）      PDF（pc） （3134KB）（48）       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）

Select

Numerical Study on Local Scour at Composite Piles with Collars in Uniform Flows WANG Hui, DU Dengxuan, LIU Haichao, YU Guoliang, ZHANG Minxi Ocean Engineering Equipment and Technology    2024, 11 (3): 1-9.   DOI: 10.12087/oeet.2095-7297.2024.03.01 Abstract （75）      PDF（pc） （14824KB）（44）       Knowledge map    Save Local scour at piles poses a significant threat to the safety of offshore wind power and sea-crossing bridges. Addressing the issue of reducing scour depth is an urgent and pivotal challenge that requires immediate attention. The collar is a disk-like structure that reduces the scour depth by weakening the hydrodynamics around the pile. In this study, numerical experiments on the local scour at composite piles with different collars were conducted. The influence of collar layout position, thickness, width, and attack angle on local flow field, bed shear stress, and scour protection effect were discussed. The results show that the position, width, and attack angle of the collar exert a significant influence on local scour, whereas the thickness of the collar has a negligible impact on its effectiveness in scour protection. The larger the collar width and the negative value of the attack angle, the better the scour protection effect. When the collar is set at the edge of the pile cap foundation, with a width ranging from 1～1.5 times the height of the pile cap foundation and an attack angle of -45°, its scour protection effect on the composite pile is the best. The results can provide references for engineering design of pile foundation scour protection. Related Articles | Metrics | Comments（0）

Select

Plugging Performance of Amphoteric Surfactant YANG Sen, DENG Guanhua, ZHANG Guodong, YANG Qifu, LUO Rugui Ocean Engineering Equipment and Technology    2024, 11 (2): 101-105.   DOI: 10.12087/oeet.2095-7297.2024.02.22 Abstract （102）      PDF（pc） （5189KB）（42）       Knowledge map    Save The foaming and foam stabilizing properties of temperature-and salt-resistant amphoteric surfactants were studied. Through the foaming experiment， the temperature and salt resistant foaming agent (TTB， XXB) and foam stabilizer (AEO) were selected， and then the compound system of the three foaming agents and foam stabilizer was studied， and the formula with large foaming volume and good stability was obtained. Finally， the effects of temperature， NaCl and CaCl2 on foam properties were studied by foam stability experiments. At each experimental temperature (20℃， 60℃， 80℃， 90℃)， the foaming volume of TTB， XXB and AEO series nonionic surfactants decreased to a certain extent， and the foam stability increased significantly with the increase of the concentration of EO (oxyethylene chain number) series surfactant. In addition， with the increase of EO (oxyethylene chain number)， the foaming volume increases and the stability decreases. With the increase of temperature， the foam volume increases and the stability decreases gradually. With the increase of the concentration of Na+ and Ca2+， the foam volume gradually decreased and the stability increased， but the effect of Ca2+ was more obvious than that of Na+. Related Articles | Metrics | Comments（0）

Select

Fault Diagnosis of Electric Slip Ring of EPSO Single Point Mooring Base on CART Decision Tree ZHANG Baolei1, WU Yuke2, TANG Yufeng2 Ocean Engineering Equipment and Technology    2024, 11 (2): 95-100.   DOI: 10.12087/oeet.2095-7297.2024.02.21 Abstract （151）      PDF（pc） （2704KB）（40）       Knowledge map    Save In order to ensure the safety of electric slip ring system， it is necessary to carry out the research on the fault diagnosis method of electric slip ring. This method could provide the basis for the fault warning and troubleshooting of single point mooring electric slip ring. In this paper， a fault diagnosis model based on CART decision tree algorithm is adopted to diagnose the single point electric slip ring fault of FPSO. The sample data set is made by finite element method， and the fault diagnosis model of electric slip ring is obtained by training the data set. Finally， the diagnosis model is simplified by the post pruning method， and the fault diagnosis of the electric slip ring is realized. The analysis results show that the model has high accuracy and fast diagnostic speed， and can effectively diagnose the electric slip ring， so that the staff can take measures to repair or replace the electric slip ring in time to ensure the safety and normal operation of the FPSO. Related Articles | Metrics | Comments（0）

Select

Application of Stability Control Device in Offshore Oil Platform Power Grid WANG Jing, WANG Wei, WANG Aiwu Ocean Engineering Equipment and Technology    2024, 11 (1): 65-69.   DOI: 10.12087/oeet.2095-7297.2024.01.11 Abstract （179）      PDF（pc） （1253KB）（40）       Knowledge map    Save The stability control device adopts advanced platform based design concepts and provides standard model services for applications through hardware and software modular design. The stability control device is a control device installed in power plants or substations to ensure the stability of the power system when encountering large disturbances in the land power grid. It achieves functions such as machine cutting， load cutting， and rapid output reduction according to standardized strategies. This article studies the standard services of domestic power grid stability control devices， develops stability control strategies suitable for offshore platform power station management， completes the intelligent strategy and functional research and development of stability control devices， configures stability control master and slave machines according to on-site strategy requirements， and develops control and disposal strategies and intelligent requirements suitable for on-site working conditions. Related Articles | Metrics | Comments（0）

Select

One Hydraulic Displacement Compensation System for a Marine Adsorption Mooring Device LIU Yuliang, ZHU Di, ZHU Yongkai, OUYANG Lihu Ocean Engineering Equipment and Technology    2024, 11 (2): 59-62.   DOI: 10.12087/oeet.2095-7297.2024.02.13 Abstract （103）      PDF（pc） （1691KB）（38）       Knowledge map    Save When the transfer loading and unloading of the ship， the longitudinal displacement between the ship and the dock or between the ship is changed. The traditional method is to compensate for the change of displacement by adjusting the cable. In this thesis， the author a compensation method that the relative displacement between the ship and the dock as the input quantity， calculates the control quantity of the hydraulic system through the PLC control system， and compensates the change of the ship's longitudinal displacement by the way of the stroke cylinder expansion of the hydraulic arm. Related Articles | Metrics | Comments（0）

Select

Key Influencing Factors Analysis of Satellite Well Tieback Plan for Subsea Oil and Gas Fields MENG Yao, WEI Juan Ocean Engineering Equipment and Technology    2024, 11 (1): 159-163.   DOI: 10.12087/oeet.2095-7297.2024.01.24 Abstract （98）      PDF（pc） （2127KB）（38）       Knowledge map    Save With the increasingly discover of subsea oil and gas resources and the increasingly mature technology of subsea production systems， China National Offshore Oil Corporation （CNOOC） is rationally promoting development of newly discovered oil and gas field as well as the marginal oil and gas fields. It is very important to make sure the development design is technically feasible and the economic benefits which will determine whether the project could be implemented. Satellite well tieback to the original production system is cost saving plan for newly discovered oil and gas field. This paper studies the possible tieback scenarios and the key factors which will affect the feasibility of satellite well tieback. Solutions and suggestions are provide for future tieback project as reference. Related Articles | Metrics | Comments（0）