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    Construction Technology of Large Deep water Suction Anchors 
    CHEN Xin, ZHAO Xiaolei, WANG Likun, XIAO Deming, ZHANG Tengyue
    Ocean Engineering Equipment and Technology    2022, 9 (1): 32-36.   DOI: 10.12087/oeet.2095-7297.2022.01.06
    Abstract557)      PDF(pc) (2517KB)(1005)       Save
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    Key Technologies and Breakthrough Path of Hydrogen Production by Offshore Wind Power
    GAO Chang, LI Hongtao
    Ocean Engineering Equipment and Technology    2023, 10 (2): 89-94.   DOI: 10.12087/oeet.2095-7297.2023.02.14
    Abstract535)      PDF(pc) (2904KB)(1700)       Save
    Marine renewable energy is abundant but difficult to store. The generation of green hydrogen from offshore renewable energy can provide a new idea for the storage of green energy. This paper mainly analyzes the key technologies of hydrogen production from offshore wind power, focusing on the four aspects of offshore water electrolysis hydrogen production technology, offshore hydrogen energy storage and transportation technology, offshore hydrogen production and storage equipment design, as well as offshore hydrogen production and storage scheme. This paper compares and summarizes the key technologies of offshore wind power hydrogen production in China, and puts forward relevant countermeasures and suggestions on this basis. It provides reference for the innovative development of offshore wind power hydrogen production technology and equipment in China.
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    Research on the Mechanical Performance of Polyester Rope Based on the Dynamic Stiffness Model
    KANG Zhuang, SUI Haibo, HuangJun, AI Shangmao
    Ocean Engineering Equipment and Technology    2023, 10 (2): 140-144.   DOI: 10.12087/oeet.2095-7297.2023.02.22
    Abstract479)      PDF(pc) (6034KB)(791)       Save
    The taut mooring system using polyester rope as the mooring lines overcomes the heavy weight of the traditional chain mooring material and provides better mooring performance for the floating structures, which attracts much attention in the field of deep-water mooring. The nonlinear mechanical properties of the polyester make it more difficult to predict the tension response of the material. Therefore, it is essential to model this nonlinear relationship accurately. In this paper, based on the absolute nodal coordinate formulation under the condition of large axial tension and combined with the dynamic stiffness model of 8-strand braided polyester rope, the tension response of the polyester line is accurately calculated and analyzed, and the results are compared with the approximate method. The simulation shows that the axial tension of the polyester cable obtained by the accurate model is larger than that of the approximate method. The nonlinear constitutive relationship of the polyester cable displays the phenomenon that the larger stretch, the larger sitffness is. Besides, the approximate method will distort the tension prediction. Therefore, it is necessary to adopt an accurate dynamic stiffness model in calculating the tension response of mooring systems using polyester material.
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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
    Abstract465)      PDF(pc) (3948KB)(843)       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.
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    Time-frequency Method Comparison for Wave-induced Fatigue Prediction of Deepwater SCRs
    HUANG Jun, KANG Zhuang, ZHANG Yansong, AI Shangmao
    Ocean Engineering Equipment and Technology    2023, 10 (2): 112-118.   DOI: 10.12087/oeet.2095-7297.2023.02.18
    Abstract437)      PDF(pc) (5975KB)(306)       Save
    Wave-induced fatigue damage is an important component of deep-water steel catenary riser (SCR) fatigue damage. In this paper, the fatigue damage caused by SCR wave in the South China Sea caused by storm state is predicted through time domain and frequency domain respectively. The difference of platform motion response and riser dynamic response obtained by time domain method and frequency domain method is also analyzed. The prediction results of fatigue damage risk position and damage extreme value are then compared. The applicability of the methods in prediction of deep-ocean risers’ wave-induced fatigue was evaluated. The result show that there is a huge gap between the time domain method and the frequency domain method, and that the damage risk position calculated by the frequency domain method is lagging behind. With the frequency domain method, the wave-induced fatigue cumulative damage is amplified, while the order of magnitude is consistent.
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    Engineering Exploration and Practice of Key Technology for Floating Offshore Wind Turbine Equipment
    LI Hongtao, YANG Linlin, QU Xiaoqi, SUN Tao
    Ocean Engineering Equipment and Technology    2023, 10 (2): 79-88.   DOI: 10.12087/oeet.2095-7297.2023.02.13
    Abstract433)      PDF(pc) (12983KB)(154)       Save
    Floating offshore wind turbine equipment has gradually become a hot topic in the development of deep-sea renewable energy. However, there are still a series of technical difficulties and challenges in the commercialization of floating offshore wind turbine. This study systematically combs the key technologies for design and analysis of floating offshore wind turbine equipment. The solutions and analysis methods are put forward regarding six aspects including overall performance analysis, structural global strength, mooring system design, fatigue strength analysis, stability check and dynamic cable design. A set of useful conclusions and suggestions are given through the introduction of actual domestic floating offshore wind turbine engineering project. Engineering exploration and practice are performed on the development of floating offshore wind turbine equipment in China, and it is expected to provide useful reference for the development and expansion of China's floating offshore wind turbine technology.
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    A Brief Summary of Key Points for The Installation of Offshore Wind Turbine Monopile Foundation
    FAN Changhui
    Ocean Engineering Equipment and Technology    2023, 10 (2): 1-7.   DOI: 10.12087/oeet.2095-7297.2023.02.01
    Abstract385)      PDF(pc) (6154KB)(1724)       Save
    The installation of offshore wind turbine monopile foundation requires a variety of ship machinery and lifting equipment, etc. If the suitabe selection of those above matters could make the completion of the construction objectives be achieved. In order to select suitable ship machinery lifting equipment, using project as example the compare between domestic and foreign monopile installation, the selection consideration of the main floating crane ship and the drivability of the hydraulic hammer are specifically analyzed through the verification analysis of the monopile stabilizing platform and the description of other additional installation points, which shows that the main considerations for the selection of marine machinery and lifting equipment for offshore wind turbine monopile installation in China and the verification analysis methods are useful. These can provide serve as for the selection of marine floating machine for monopile installation, for the design and verification of monopile stabilizing platform, and for the preparation of construction organization and scheme.
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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
    Abstract352)      PDF(pc) (698KB)(634)       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.

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    Electrical System Scheme Analysis of a 10 MW Ocean Thermal Energy Conversion Plant
    WUYonghu, LV Huanhuan, YUTing, LANZhigang
    Ocean Engineering Equipment and Technology    2022, 9 (1): 46-51.   DOI: 10.12087/oeet.2095-7297.2022.01.08
    Abstract346)      PDF(pc) (3330KB)(357)       Save
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    Simulation Analysis of a Subsea Hydraulic Control System Based on SimulationX
    LIUYongfei
    Ocean Engineering Equipment and Technology    2022, 9 (1): 1-7.   DOI: 10.12087/oeet.2095-7297.2022.01.01
    Abstract338)      PDF(pc) (5399KB)(368)       Save
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    Analysis of J-Lay Laying of Large Diameter Submarine Pipeline
    Huang Jun, LI Shaojie, KANG Zhuang
    Ocean Engineering Equipment and Technology    2023, 10 (2): 145-151.   DOI: 10.12087/oeet.2095-7297.2023.02.23
    Abstract337)      PDF(pc) (10242KB)(56)       Save
    J-Lay system has been the most suitable laying method for large diameter subsea pipeline at present because of its advantageous pipeline laying form. In the process of laying large diameter submarine pipeline with J-Lay system, the effect of laying angle and water depth on the pipeline is of critical importance. Therefore, based on the catenary theory, the static analysis considering the factors above has been carried out in order to determine the suitable laying angle of large diameter submarine pipeline under different water depths. In addition, the time domain dynamic analysis has been conducted to study the influence of ship motion, current incidence angle and existing pipeline damage on the dynamic stress of pipeline, and the results can server as reference for engineering practice.
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    Overview of the Development of Expendable Conductivity Temperature and Depth
    DU Libin, CUI Yongchao, LIU Jie, ZHANG Xiaobo
    Ocean Engineering Equipment and Technology    2023, 10 (3): 33-40.   DOI: 10.12087/oeet.2095-7297.2023.03.04
    Abstract336)      PDF(pc) (1757KB)(1259)       Save

    Expendable Conductivity Temperature and Depth (XCTD) is an advanced marine dynamic environmental element measuring instrument, which can be used on various civil and military vessels, aircraft or submarines to quickly obtain underwater environmental information data. It is a standing instrument for marine survey and an important supplement to traditional measuring instruments such as marine environmental monitoring buoy, submarine buoy and shipborne CTD because of its flexibility, economy and simplicity. At present, the Expendable Conductivity Temperature and Depth is widely used in the field of ocean profile observation because of its characteristics of simple measurement, high measurement efficiency and low hardware cost. In order to understand the development gap at home and abroad and clarify the future development direction of this field, this paper expounds the development status of the expendable marine exploration instruments at home and abroad through comparative analysis and summary starting from its classification, at the same time, compares the main gap between domestic and foreign products, and focuses on the working principle and key technology of the Submarine-launched Expendable Conductivity Temperature and Depth (SSXCTD), meanwhile, the research summarized the future research directions in this field.

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    Research and Application of Heave Compensation Technology in Deep-Sea Mining Engineering
    YU Dequan, JI Jiangang, XIA Kui, XIA Haihong, HUANG Tianzhong, TAO Jun
    Ocean Engineering Equipment and Technology    2023, 10 (2): 131-139.   DOI: 10.12087/oeet.2095-7297.2023.02.21
    Abstract331)      PDF(pc) (16741KB)(119)       Save
    In this paper, the significance of the research on heave compensation technology in deep-sea mining engineering is described, and the overall plan, working principle as well as workflow of the heave compensator are studied that ensures that the lifting pipe can obtain the supporting force and compensation force during operation, maintain a stationary position relative to the seabed and work steadily. Through the simulation analysis method, the dynamic comprehensive performance of the heave compensation system is studied. The influence law of vibration period, load size, hydraulic line flow resistance, friction and other factors of the mining ships on the compensation effect is also summarized. In addition, the speed-limited safety technology is analyzed, while the functional principle, structural composition and test plan of the speed-limited shut off valve are studied. The safety guarantee effect is verified by the shipment applications. As a result, a more comprehensive research result on the heave compensation technology in deep-sea mining is obtained.
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    Research on the Connection between Tiller and Rudder of a Large Container Ship
    JIN Cai, WU Jinxing, LIU Jinhua
    Ocean Engineering Equipment and Technology    2023, 10 (2): 30-36.   DOI: 10.12087/oeet.2095-7297.2023.02.05
    Abstract323)      PDF(pc) (5690KB)(731)       Save
    Ship construction is tending to large-scale development, the size of the supporting tiller of large ships also increases, the procurement cost and construction difficulty will also increases correspondingly. At present, the tiller and the rudder of the ship mainly adopt two connection ways: hydraulic-keyed connection and dry-keyed connection. By analyzing and studying the connection modes between tiller and rudder, this paper obtains the optimal connection mode which meets the requirements,is convenient for construction. The parts are lightweight, which has important engineering significance. Combined with the requirements of classification Society, this paper takes a large container ship as an example, and on the basis of the two traditional connection methods, puts forward the third connection method of hydraulic-keyed connection method. The three connection methods are compared in the paper, and the finite element method is used to check the strength, and the conclusions of push up load, push-up and material yield strength are obtained. In the end, an optimal connection mode which meets the requirements of real ship is obtained, which is convenient for ship yard construction. The designed tiller is lightweight.>
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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
    Abstract321)      PDF(pc) (2530KB)(164)       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.
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    Research on Digital and Intelligent Transformation of Discrete Offshore Oil and Gas Equipment Manufacturing Industry
    HE Chen, LUO Chao, LIU Shicong, KANG Dongchun, WANG Liang
    Ocean Engineering Equipment and Technology    2023, 10 (2): 106-111.   DOI: 10.12087/oeet.2095-7297.2023.02.17
    Abstract317)      PDF(pc) (4845KB)(234)       Save
    This paper firstly expounds the impact of the application of digital technology and intelligent on the manufacturing industry technology in the field of information technology. The cutting-edge technologies related to intelligent manufacturing are then introduced in detail, and the latest industry status quo is briefly analyzed. Then, in conjuction with the unique characteristics of equipment construction in the current offshore petroleum engineering industry, it conducts an in-depth analysis, and clarifies the pain points brought to offshore petroleum engineering by the characteristics of discrete equipment manufacturing. Finally, according to the current status of discrete manufacturing, combined with the field practice accumulated over the years, through 3D model design, intelligent robots and other multi-dimensional exploration the digital and intelligent transformation are studied in this paper.
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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
    Abstract315)      PDF(pc) (5312KB)(222)       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.
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    Research on Key Technologies of Dynamic Analysis and Numerical Simulation for the Floating Offshore Wind Turbine
    QU Xiaoqi, LI Hongtao, TANG Guangyin, DU Haiyue, YANG Linlin
    Ocean Engineering Equipment and Technology    2023, 10 (2): 72-78.   DOI: 10.12087/oeet.2095-7297.2023.02.12
    Abstract311)      PDF(pc) (8230KB)(1200)       Save
    With the development of floating offshore wind turbine technology, engineering projects of large scale floating offshore wind turbine has begun to emerge. Because manufacturers keep the parameters of wind turbine confidential, there are many challenges in numerical simulation analysis of floating offshore wind turbines in practical engineering projects. In this paper, the key technologies on numerical simulation of floating wind turbine in the practical engineering project was studied. Through the equivalent thrust model, a numerical model of real floating wind turbine was established and the dynamics responses under a typical load case was analyzed. Based on the research results of this study, the difficulties in establishing the numerical model of floating wind turbine in practical engineering projects can be well solved. This is of great significance to promote the technical development and accelerate the commercialization of China's floating wind turbine industry.
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    Dynamic Cable Fatigue Analysis Based on Time Domain Analysis Method 
    Ocean Engineering Equipment and Technology    2022, 9 (2): 50-55.   DOI: 10.12087/oeet.2095-7297.2022.02.10
    Abstract308)      PDF(pc) (3713KB)(824)       Save
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    Overview of Subsea Well Intervention Technology and Equipment Development
    WANG Di, HUANG Congcong, CHANG Shuangli
    Ocean Engineering Equipment and Technology    2023, 10 (2): 126-130.   DOI: 10.12087/oeet.2095-7297.2023.02.20
    Abstract290)      PDF(pc) (2963KB)(1167)       Save
    As the continuous expansion of the resources development of offshore oil and gas, more subsea well will be used at domestic offshore oil and gas fields, yet there is still no supporting technology and equipment for subsea well intervention in China. This paper compare the technology of well intervention and workover, introduce two kinds of light well intervention systems, compare their advantages and disadvantages, and then analyze the development and operation of subsea well intervention systems in the world. The development gap and countermeasures of related technologies in China will be summarized, at the end.
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