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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 （1049）      PDF（pc） （698KB）（2083）       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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Research Progress and Challenges of Ship Ballast Water Treatment ZHANG Weidong, DU Bin, QU Huifang, LI Tao Ocean Engineering Equipment and Technology    2023, 10 (4): 1-10.   DOI: 10.12087/oeet.2095-7297.2023.04.01 Abstract （781）      PDF（pc） （3948KB）（1701）       Knowledge map    Save Ship ballast water is one of the main ways for the alien invasion. It is considered as one of the four threats to the marine environment. The ballast water convention established to solve this problem has stipulated the standards for ballast water treatment， which has entered into force on September 6，2019. This paper reviews the background and social needs of the research on ballast water treatment technology， analyzes the characteristics of different ballast water treatment technologies， introduces the latest achievements of the research on ballast water treatment technology in the academic community， and the efforts of the industrial community in the research and development of ballast water treatment systems， and discusses the challenges faced by ballast water treatment at different levels of standards， economy， technology， testing and law. 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 （610）      PDF（pc） （5779KB）（1658）       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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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 （1261）      PDF（pc） （4193KB）（1294）       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 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 （784）      PDF（pc） （2023KB）（1182）       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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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 （1086）      PDF（pc） （1237KB）（955）       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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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 （323）      PDF（pc） （2226KB）（862）       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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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 （655）      PDF（pc） （973KB）（818）       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 （284）      PDF（pc） （2640KB）（735）       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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Study on Ideal Superstructure Design of Ship LIAO Shiyang, LIU Jun, ZENG Wenyuan Ocean Engineering Equipment and Technology    2023, 10 (4): 16-23.   DOI: 10.12087/oeet.2095-7297.2023.04.03 Abstract （465）      PDF（pc） （6248KB）（645）       Knowledge map    Save The ideal superstructure means that the superstructure does not bend when the hull is bent， and the normal stress of the superstructure is consistent in the direction of height. Different from the strong superstructure and the light superstructure， the stress level of the ideal superstructure is close to the main deck， which can maximize the utilization of material strength. In this paper， a typical oil tanker is taken as the research object. Based on the composite beam method， considering the influence of shear hysteresis effect， the design method of ideal superstructure is discussed. According to the section characteristics of superstructure， the length of ideal superstructure is explored. Based on the theoretical formula of the ideal superstructure， the design length of the ideal superstructure is obtained according to the parameters of the transverse section of the ship. After the theoretical design scheme of the ideal superstructure is obtained， the stress distribution law of the deck of the ideal superstructure is verified by the finite element method. The verification results show that the normal stress level of the superstructure is close to the main deck， which can provide reference for the design of the early ideal superstructure. Finally， the deck thickness of the superstructure is adjusted to save materials and reduce the center of gravity. 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 （290）      PDF（pc） （2092KB）（621）       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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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 （381）      PDF（pc） （2004KB）（583）       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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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 （371）      PDF（pc） （3492KB）（568）       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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Commissioning of Subsea Production System based on a Gas Field in the South China Sea JIANG Bingbing, CHEN Juan, HONG Longfei, DENG Chiyu, LONG Xiaopin, CAO Juhang, HU Yunhai Ocean Engineering Equipment and Technology    2023, 10 (4): 11-15.   DOI: 10.12087/oeet.2095-7297.2023.04.02 Abstract （412）      PDF（pc） （870KB）（514）       Knowledge map    Save The subsea production system is the key equipment for the deepwater oil and gas development， which comprises of surface control equipment and subseainstalled production equipment. In order to ensure that the surface control equipment is able to monitor and control the subseainstalled production system during normal production and shut down， the production system where required after the subsea production system is installed offshore， the commissioning work needs to be completed prior to putting into production. Based on the subsea production system of a gas field in the South China Sea， this paper briefly addresses the subsea production control system， discusses the purpose， content and procedure of the subsea production system commissioning in detail. The research will help to break technological monopoly of American and European countries in the commissioning of subsea production system and independently develop the offshore oil and gas in our country. 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 （477）      PDF（pc） （3661KB）（492）       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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Analysis of the Reason of Corrosion and Prevention Measures for 316L Stainless Steel Pipeline BI Hangming Ocean Engineering Equipment and Technology    2023, 10 (4): 30-35.   DOI: 10.12087/oeet.2095-7297.2023.04.05 Abstract （685）      PDF（pc） （5312KB）（487）       Knowledge map    Save The corrosion of stainless steel piping for a precommissioning offshore platform in the South China Sea is sampled and analyzed. The conclusion obtained from the test is that the chloride ion content exceeds the standard leading to serious corrosion of stainless steel pipelines. This paper explores the basic principles of damage caused by chloride ions to 316L stainless steel pipeline. From the perspective of offshore platform pipeline construction， for how to effectively prevent corrosion of stainless steel pipelines， we put forward relevant recommendations， and provide reference for subsequent offshore platform construction projects. Related Articles | Metrics | Comments（0）

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Application of Underwater Reinforcement Repair Technique with Wrap Composite Materials of External Corrosion for Submarine Pipeline LIU Jun, , , , ZHANG Chuanxu, , , QU Jie, , Ocean Engineering Equipment and Technology    2023, 10 (4): 24-29.   DOI: 10.12087/oeet.2095-7297.2023.04.04 Abstract （493）      PDF（pc） （2356KB）（463）       Knowledge map    Save The safe service of submarine pipelines in oil， gas and water transportation is very important， and the long standing corrosion problem also affects the service life of submarine pipelines. The composite material reinforcement and repair technology has been widely used in onshore pipelines， but it has not been applied in the repair of submarine pipelines. A submarine pipeline adopts the composite material underwater winding reinforcement and repair technology to carry out practical application. The practical application proves that the composite material underwater winding reinforcement and repair technology is a safe and reliable reinforcement and repair technology. This paper will introduce the repair material properties of the composite underwater winding reinforcement repair technology， the application design of the repair system， and the construction technology of the repair system. Related Articles | Metrics | Comments（0）

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Anomaly Detection of Environmental Features Based on LSTM-Reconstructed Data ZHOU Lei1, SU Xin2, ZHANG Qi2, HUANG Yi2 Ocean Engineering Equipment and Technology    2024, 11 (4): 1-7.   DOI: 10.12087/oeet.2095-7297.2024.04.01 Abstract （287）      PDF（pc） （5649KB）（452）       Knowledge map    Save With the advancement of environmental monitoring technologies， accurately identifying anomalies in data has become a crucial challenge. This study introduces a method combining Long Short-Term Memory (LSTM) networks and Random Forest models for predicting and reconstructing environmental feature data， thereby enabling effective anomaly monitoring. Initially， the LSTM model is used to forecast time series data for environmental features such as wind speed and direction. Subsequently， these forecasts are used as inputs to apply a Random Forest model for predicting axial force. The research indicates that by reconstructing features， the accuracy of axial force predictions can be significantly enhanced compared to direct anomaly detection methods. The R2 values， Mean Absolute Error (MAE)， and Root Mean Squared Error (RMSE) for data with reconstructed features surpass those for data with original features. Particularly， the improvement from an R2 value of 0.921 to 0.956 underscores a significant enhancement in the model's data fitting capability. Related Articles | Metrics | Comments（0）

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Current Situation and Development Trend of Unmanned Platform Technology in Offshore Oilfield SUI Xianfu, QIU Hao, ZHANG Fu, ZHOU Chao, WANG Juanyan Ocean Engineering Equipment and Technology    2023, 10 (4): 111-116.   DOI: 10.12087/oeet.2095-7297.2023.04.16 Abstract （650）      PDF（pc） （2530KB）（452）       Knowledge map    Save With the development of offshore oil field, the cost of production and operation is increasing rapidly.Unmanned platform technology has been widely concerned in recent years because of its simple structure, less equipment and low production and operation cost. However, the unmanned platform mode also exposes the problems of high cost of workover operation, difficulty of boarding the platform and difficulty of equipment monitoring in the process of production and operation. The author systematically summarizes the experience of unmanned platform development by investigating the advanced technologies and excellent practices in the current unmanned platform development process, which aims to provide a reference for the further promotion and application of unmanned platform technology. Related Articles | Metrics | Comments（0）

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Design and Analysis of Mooring System for Hexagonal Floating Photovoltaic Platform SUN Jiayang, CUI Yutao, REN Tie, WANG Yihou Ocean Engineering Equipment and Technology    2024, 11 (4): 29-35.   DOI: 10.12087/oeet.2095-7297.2024.04.05 Abstract （452）      PDF（pc） （9090KB）（436）       Knowledge map    Save Floating photovoltaic platforms， recognized as the most promising technological development direction in the industry， have advantages such as wide application scenarios and low environmental pollution. Their development is of great significance for the development and utilization of offshore solar energy. However， the research on floating photovoltaic platforms in China started relatively late and is still in the empirical stage. As a positioning system for floating photovoltaic platforms， mooring systems can ensure stable operation under extreme sea conditions. Therefore， the design and selection analysis of mooring systems have important research value. This article compares the scattering mooring and group mooring forms of a floating photovoltaic platform in the waters of China， and explores the motion response characteristics and mooring line tension characteristics of different mooring forms of photovoltaic platforms under extreme sea conditions. The research results can provide reference for the reasonable selection and design of photovoltaic platform mooring systems. 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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Research on AUV Path Planning Method Based on Deep Sea Multi-Target Search Mission XU Chunhui1, 2, ZHOU Shihao1, 2, 4, QI Yu1, 2, FANG Tian1, 2, 3, YANG Shilin1, 2, 3 Ocean Engineering Equipment and Technology    2024, 11 (4): 95-102.   DOI: 10.12087/oeet.2095-7297.2024.04.15 Abstract （322）      PDF（pc） （4652KB）（406）       Knowledge map    Save Autonomous underwater robots (AUVs) can perform tasks such as resource exploration and target search in deep sea areas. At offshore sites, we often face the need to quickly respond to mission deployment and conduct path planning for AUV search and mapping missions. This paper proposes an AUV multi-target search method that clusters first and then searches in the AUV multi-suspect target point search task. It performs K-means clustering on multiple target points in the large-scale sea area to be measured to form multiple target points to be tested. The measurement area reduces the search for non-target areas and ensures higher search efficiency when the AUV carries limited energy; the comb path scheme is implemented in multiple areas to be measured to form an AUV search path in multiple areas. An AUV multi-target clustering search software based on Tkinter was developed to implement the method proposed in this article through visual interactive tools, solving the problems of time-consuming and error-prone manual planning and improving the efficiency of AUV deployment. Finally, We compare the length of AUV paths between different cluster numbers to determine the feasibility and application value of this method. 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 （381）      PDF（pc） （5657KB）（405）       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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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 （302）      PDF（pc） （1894KB）（400）       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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Research on Product Standard and Test Scheme of High Pressure Underwater Valve YAN Jiayu, HONG Yi, LIU Boying, ZHOU Xuejun, CHEN Di, HE Xiaoyong Ocean Engineering Equipment and Technology    2023, 10 (4): 36-43.   DOI: 10.12087/oeet.2095-7297.2023.04.06 Abstract （355）      PDF（pc） （689KB）（397）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Research on Vibration Suppression of New Barge Floating Wind Turbine by TMD in the Platform JIANG Kun, CAI Qingqing, LI Sunwei Ocean Engineering Equipment and Technology    2023, 10 (4): 122-129.   DOI: 10.12087/oeet.2095-7297.2023.04.18 Abstract （508）      PDF（pc） （1461KB）（369）       Knowledge map    Save Barge-type floating wind turbine is an important equipment for the development of offshore wind power， and its motion response can be effectively suppressed by a passive control device tuned mass damper (tuned mass damper， TMD). Based on the ITI Energy Barge wind turbine， this study designs a new Barge floating wind turbine foundation， establishes a wind turbine dynamic model configured with TMD in the platform， configures TMDs with different positions， masses， and damping parameters in the floating platform， and studies the change of the motion response of the floating wind turbine before and after the TMD with optimal parameters configured on the wind turbine platform under the action of wind and wave loads. The results show that after the TMD with a mass ratio of 3% and a damping ratio of 6% is configured on the top of the buoy in the new wind turbine platform， the front and rear and left and right displacements of the top of the wind turbine tower are reduced by 15.56% and 44.93% respectively. The pitch and roll suppression rate of the platform reaches 22.97% and 62.79%. The front and rear and left and right bending moments of the fan tower base are reduced by 15.62% and 39.8% respectively. At this time， the control effect of TMD is the best， and the overall stability of the wind turbine is greatly improved. 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 （438）      PDF（pc） （3344KB）（366）       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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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 （233）      PDF（pc） （7928KB）（329）       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 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 （295）      PDF（pc） （2200KB）（328）       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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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 （321）      PDF（pc） （1171KB）（327）       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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Several Applications of Vibration Monitoring in Structural Safety Assurance of Jacket Platform WANG Huoping, WANG Deyang, PENG YiJin, WANG Weiwei Ocean Engineering Equipment and Technology    2023, 10 (4): 78-83.   DOI: 10.12087/oeet.2095-7297.2023.04.12 Abstract （315）      PDF（pc） （8291KB）（323）       Knowledge map    Save A large number of platforms in my country's waters have entered the middle and late stages. The management of these aging platforms， especially structural safety， has become the focus of the current operator's relationship. Vibration monitoring is used. The safety assurance of the jacket platform structure is a new type of means， which provides early warning through fundamental frequency changes and displacement changes. The fundamental frequency change is realized by shorttime Fourier transform and wavelet spectrum analysis methods. In addition， a method of correcting the evaluation model through vibration measurement and then performing post evaluation is proposed. Related Articles | Metrics | Comments（0）

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Life Prediction of Glass Fiber Reinforced Vinyl Ester Composites Under Seawater Corrosive Environment LI Xiang, LIU Xiao, LI Sen, LIU Chengcheng, LIU Xiaobin, GAO Shuang Ocean Engineering Equipment and Technology    2023, 10 (4): 107-110.   DOI: 10.12087/oeet.2095-7297.2023.04.15 Abstract （608）      PDF（pc） （1277KB）（320）       Knowledge map    Save Fiber reinforced plastics shields are used in the development of offshore oil and gas fields in the South China Sea to protect critical facilities in underwater production systems. Fiberglass (FRP) is the most commonly used composite material， widely used in Marine and ocean engineering fields. By establishing the seawater corrosion resistance life model and defining the bending strength retention rate， the general equation of seawater corrosion resistance life and the seawater corrosion resistance life formula under deepsea low temperature conditions are obtained. Based on the flexural strength test results of longterm immersion in seawater at room temperature and high temperature， from the point of view of bending strength， corrosion resistance is short. it is predicted that the corrosion resistance life of glass fiber reinforced vinyl ester composites in the seawater temperature range of 0-4℃ is about 12.28-16.55 years for applications subject to low bending loads. Related Articles | Metrics | Comments（0）

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Research and Application of Fine Imaging Processing Technology of Buried Hill in the Overlapping Area of Multiple Working Areas in Bohai Sea XI Zibin Ocean Engineering Equipment and Technology    2023, 10 (4): 130-134.   DOI: 10.12087/oeet.2095-7297.2023.04.19 Abstract （199）      PDF（pc） （4624KB）（317）       Knowledge map    Save At present， the Bohai Sea working area has achieved full coverage of 3D acquisition， but the construction time span of different working areas is large. There are a variety of acquisition methods， so different working areas have great differences in acquisition direction， offset range， amplitude difference， frequency characteristics， signaltonoise ratio and other aspects， which brings arduous challenges to buried hill imaging in the overlapping area of multiworking areas. In order to improve the imaging quality of buried hill structural area， this paper focuses on three aspects： fine key processing technology， fine splicing technology and high precision 3D prestack depth migration. Through the actual data verification， the imaging effect of the proposed method on buried hill of old data in the overlapping area of multiple working areas in Bohai Sea is significantly improved， which better verifies the effectiveness of the proposed method. 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 （268）      PDF（pc） （2202KB）（315）       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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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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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 （791）      PDF（pc） （1382KB）（309）       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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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 （353）      PDF（pc） （856KB）（301）       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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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 （342）      PDF（pc） （4331KB）（296）       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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Design and Optimization of Impeller for Underwater Helico-axial Multiphase Pump LIU Yibo1, BI Yuqin1, MA Qiang2, 3, XIAO Huaping1, LIU Shuhai1 Ocean Engineering Equipment and Technology    2024, 11 (4): 14-20.   DOI: 10.12087/oeet.2095-7297.2024.04.03 Abstract （394）      PDF（pc） （2410KB）（296）       Knowledge map    Save As a key equipment in underwater pressurization technology， the underwater helical axial flow mixing pump is widely used in the development of offshore oil and gas fields. How to further enhance its pressurization performance has attracted the attention of researchers. This study adopts a method combining orthogonal experimental design and numerical simulation to optimize 5 key structural parameters of the helical axial flow pump impeller， aiming to improve the pressurization performance of the mixing pump. Using Fluent software and the standard SST k-ω turbulence model， numerical simulations are conducted on a singlestage compression unit of a helical axial flow pump with an impeller shaft diameter of 350 mm. The influence of five different structural parameters of the impeller on the pressurization performance is studied， and the optimal parameter combination is determined. The results show that under the operating conditions of a flow rate of 500 m3/h and a speed of 4500 r/min， the pressurization performance is optimal for a compression unit with three blades， a blade wrap angle of 130°， a blade thickness of 6 mm， and inlet and outlet angles of 6°， achieving 2.02 MPa， which is a 22% improvement in pressurization compared to the initial structure. Finally， numerical simulations are carried out on the optimized threestage mixing pump impeller under different operating conditions to predict the pressurization effect. The research results provide a theoretical basis for the design and optimization of underwater helical axial flow mixing pumps. Related Articles | Metrics | Comments（0）

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Evaluation of Lamellar Tearing Resistance of Extra High Strength Steel for Deepwater Jacket ZENG Jingbo, WANG Huopin, LUN Yuguo Ocean Engineering Equipment and Technology    2023, 10 (4): 117-121.   DOI: 10.12087/oeet.2095-7297.2023.04.17 Abstract （288）      PDF（pc） （2717KB）（285）       Knowledge map    Save All main structure of jacket platforms that have been built and put into operation in China use high strength steel of 355MPa at present. In order to reduce weight to meet the capacity of launching barge， some deepwater jacket under constrcution uses more than 20000t extra-high strength steel of 420MPa， which is produced in domestic. To ensure the securely construction of the jacket， the lamellar tearing performance and susceptibility of domestic extra-high strength steel API 2Y-60 for deepwater jacket are evaluated in this paper through chemical composition analysis， Z-direction tensile test and Z-type window test. The test results mean that the domestic API 2Y-60 steel has good lamellar tearing resistance， which is the basic condition of steels used in jacket tubular joints. The research results can ensure the safety of jacket platform， and also provide a reference for the first application demonstration of similar structural steel. Related Articles | Metrics | Comments（0）