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透空结构与半潜式风机集成系统耦合运动响应特性分析

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哈尔滨工程大学学报（英文版） 2024年第2期23卷 491-505页

作者：姚一晟 Robert Mayon 周宇朱祎宁德志 State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Dalian Key Laboratory of Offshore Renewable Energy Dalian University of TechnologyDalian 116024China Powerchina Zhongnan Engineering Corporation Limited Changsha 410000China

A novel semi-submersible platform is proposed for 5 MW wind turbines.This concept focuses on an integrated system formed by combining porous shells with a semi-submersible platform.A coupled aerodynamic–hydrodynamic–mooring analysis of the new system is performed.The motion responses of the novel platform system and the traditional platform are compared.The differences in hydrodynamic performance between the two platforms are also evaluated.The influence of the geometric parameters(porosity,diameter,and wall thickness)of porous shells on the motion response behavior of the new system is studied.Overall,the new semi-submersible platform exhibits superior stability in terms of pitch and heave degrees of freedom,demonstrating minimal effects on the motion response in the surge degree of freedom.

关键词： Semi-submersible platform Porous shells OC4-DeepCwind motion response Hydrodynamic parameters Porous shells’geometric parameters

Analysis of Wave Added Drag and motion response of Mid-high-speed Ship against Waves

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Sustainable Marine Structures 2023年第1期5卷 1-10页

作者： Jing Wang Yu Zhou China Institute of Marine Technology and Economy Beijing100081China Jiangsu Shipping College NantongJiangsu226010China

In order to accurately predict the on-wave resistance and responses to hull motions of ships in actual sea conditions,the k-εmethod of the RNG model is adopted on the basis of the unsteady RANS method.The two-formula turbulence model deals with the viscous flow,the VOF method captures the free surface,the velocity boundary method makes waves,the artificial damping method is used to eliminate waves,and the nested grid technology is used to deal with the motion response of ships on waves.Combined with the 6-DOF motion formula,a three-dimensional numerical wave cell for regular waves is established.For one example,taking a KCS Container ship and fishing boat sailing at a mid-high-speed,the increase of wave resistance and motion response at different wavelengths are analyzed,and the simulation results are compared with the experimental value,the content of strip theory in potential flow theory and the panel method to prove the reliability of CFD method in predicting ship motion.

关键词： CFD method Wave added resistance motion response Numerical pool Numerical simulation

Hydrodynamic Characteristics of Three-Bucket Jacket Foundation for Offshore Wind Turbines During the Lowering Process

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China Ocean Engineering 2023年第1期37卷 73-84页

作者： ZHANG Pu-yang QI Xin WEI Yu-mo ZHANG Sheng-wei LE Cong-huan DING Hong-yan State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China

The three-bucket jacket foundation is a new type of foundation for offshore wind turbine that has the advantages of fast construction speed and suitability for deep water. The study of the hoisting and launching process is of great significance to ensure construction safety in actual projects. In this paper, a new launching technology is proposed that is based on the foundation of the three-bucket jacket for offshore wind turbine. A complete time domain simulation of the launching process of three-bucket jacket foundation is carried out by a theoretical analysis combined with hydrodynamic software Moses. At the same time, the effects of different initial air storage and sea conditions on the motion response of the structure and the hoisting cable tension are studied. The results show that the motion response of the structure is the highest when it is lowered to 1.5 times the bucket height. The natural period of each degree of freedom of the structure increases with the increase of the lowering depth. The structural motion response and the hoisting cable tension vary greatly in the early phases of Stages Ⅰ and Ⅲ, smaller in Stage Ⅱ, and gradually stabilize in the middle and late phases of Stage Ⅲ.

关键词： three-bucket jacket foundation time domain simulation hoisting construction motion response offshore wind turbine

A Review of Research Status and Scientific Problems of Floating Offshore Wind Turbines

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Energy Engineering 2022年第1期119卷 123-143页

作者： Zhen Lei Xinbao Wang Shuni Zhou Zekun Wang Tengyuan Wang Yingjian Yang China State Shipbuilding Co. Ltd.Beijing100097China Institute of Engineering Thermophysics Chinese Academy of ScienceBeijing100190China CSIC Haizhuang Windpower Co. Ltd.Chongqing401122China

With the continuous utilization of offshore wind resources,the installation depth and capacity of offshore wind turbines are increasing.In order to meet construction requirements of renewable energy,offshore wind farms are bound to develop further and deeper into the sea.As a result,a novel kind of power generation equipment,Floating Offshore Wind Turbines(FOWT),emerges as the times require.Consequently,this paper provides an objective comment on some key scientific difficulties.Firstly,The statistics and forecast of the market demand and installed capacity of offshore wind energy show a steady growth.After that,the advantages of constructing FOWT and most floating projects in various countries are summarized.And then,the reconstruction design of blades is reviewed under“Reynolds number”and“Froude number”similarity criterion,which is a prerequisite for achieving specific aerodynamic performance.So far,this paper focuses on aerodynamic researches,including aerodynamic forces and flow fields.On this basis,pitch angle control strategies are proposed to reduce aerodynamic forces on the premise of ensuring power generations.Finally,some other joint science problems to be solved are listed.Whether theoretical analysis,numerical simulations,ocean engineering basin tests,wind tunnel experiments or prototype sea measurements,FOWT is expected to break through various obstacles and finally achieve efficient and stable commercial operations.

关键词： FOWT scale effect motion response load control

motion and Dynamic responses of A Semisubmersible in Freak Waves

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China Ocean Engineering 2017年第6期31卷 754-763页

作者： LI Xin DENG Yan-fei LI Lei TIAN Xin-liang LI Jun State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai 200240 China CIMC Offshore Co. Ltd. Shenzhen 518000 China

The present research aims at clarifying the effects of freak wave on the motion and dynamic responses of a semisubmersible. To reveal the effects of mooring stiffness, two mooring systems were employed in the model tests and time-domain simulations. The 6-DOF motion responses and mooring tensions have been measured and the 3- DOF motions of fairleads were calculated as well. From the time series, trajectories and statistics information, the interactions between the freak wave and the semisubmersible have been demonstrated and the effects of mooring stiffness have been identified. The shortage of numerical simulations based on 3D potential flow theory is presented. Results show that the freak wave is likely to cause large horizontal motions for soft mooring system and to result in extremely large mooring tensions for tight mooring system. Therefore, the freak wave is a real threat for the marine structure, which needs to be carefully considered at design stage.

关键词： motion response mooring tension semisubmersible freak wave mooring stiffness

Hydroelasticity analysis of a vessel-shaped fish cage under incident,diffraction and radiation wave fields

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Journal of Ocean Engineering and Science 2023年第4期8卷 418-434页

作者： Yihou Wang Shixiao Fu Torgeir Moan Yuwang Xu Tianhu Cheng State Key Laboratory of Ocean Engineering SJTUShanghaiChina Centre for Autonomous Marine Operations and Systems(AMOS) NTNUNorway Faculty of Maritime and Transportation Ningbo UniversityNingboChina

Vessel-shaped fish cages are promising large aquaculture structures developed in recent years,with an overall length of nearly 400 m.In this paper,a coupled hydroelasticity model of a vessel-shaped fish cage is used to calculate the motion and structural response in the time domain.First,the floating body of the cage is discretized into a multimodule system to calculate the frequency-domain hydrodynamic loads.Then,the multimodule system is connected by equivalent elastic beams to consider the hydroelastic be-havior in the time domain.The hydrodynamic loads of the multimodule system are transformed from the frequency-domain loads.Moreover,based on the velocity field transfer functions and the motion of the multimodule system,coupling wave fields considering incident,diffraction and radiation waves are built and used to calculate the loads on the net and steel frame.By iterating the motion response of the multi-module system and the hydrodynamic loads on the net and steel frame in the time domain,the balanced hydroelasticity response of the whole cage is finally obtained.The results show that the hydroelasticity effects have a significant influence on the vertical displacement and cross-sectional load effects of the vessel-shaped fish cage.

关键词： Vessel-shapedfish cage Hydroelasticity motion response Cross-sectional load effect Net twine tension

Numerical Simulation of Dynamic response of A Net Cage for Flatfish in Waves

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China Ocean Engineering 2014年第1期28卷 43-56页

作者：桂福坤赵云鹏许条建关长涛 National Engineering Research Center for Marine Aquaculture Zhejiang Ocean University State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Yellow Sea Fisheries Research Institute

A numerical model of flatfish cage is built based on the lumped mass method and the principle of rigid body kinematics. To validate the numerical model, a series of physical model tests are conducted in the wave flume. The numerical results correspond well with the data sets from physical model test. The effect of weight of bottom frame, height of fish net and net shape on motion responses of fish cage and tension force on mooring lines is then analyzed. The results indicate that the vertical displacements of float collar and bottom frame decrease with the increase in the weight of bottom frame; the maximum tension force on mooring lines increases with the increasing weight of bottom frame. The inclination angles of float collar and bottom frame decrease with the increasing net height; the maximum tension force increases obviously with the increase of net height.

关键词： flatfish cage motion response numerical simulation physical model test

Analysis of the Dynamic System of Wave Glider with a Towed Body

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Journal of Ocean University of China 2020年第3期19卷 519-524页

作者： ZHANG Jiakun CHANG Zongyu LU Guiqiao ZHENG Zhongqiang ZHANG Zhonglin College of Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Ocean Engineering of Shandong Province Qingdao 266100China College of Mechanical and Electrical Engineering Harbin Engineering UniversityHarbin 150001China

Mobile observation platforms are widely used in oceanographic and marine resource exploration and other applications. Wave Glider is a mobile platform that can transform wave energy into locomotion power and overcome the bottleneck of low energy supply. Wave Glider has recently been applied to tow underwater sensors fulfilling observation tasks. In this paper, the dynamic system of Wave Glider with a towed body is studied by applying multibody mechanics, and the relevant motion conditions of the system are investigated. Dynamic models of Wave Glider with a towed body and tether are first developed individually and then integrated into a whole model. The numerical method is used to obtain the dynamic responses and assess performance of the towed body pulled by the submerged glider of Wave Glider. The effects of sea state, mass of the towed body, and length of the towed cable are investigated on the basis of simulation results. This work can be used for the design and analysis of Wave Glider-towed body systems.

关键词： Wave Glider towed system motion response dynamic analysis

Wave Influence on Underwater Launch and Recovery System

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China Ocean Engineering 1997年第1期12卷 61-68页

作者： Lian, L Gu, YG Department of Naval Architecture and Ocean Engineering Shanghai Jiao Tong University China

In this paper, the underwater vehicle, sling and the mother ship are considered as a single degree of freedom system connected by a spring. Through the analysis of this system, a physical model is established, which describes the motion of the vehicle caused by the ship motion and wave motion. Furthermore, a mathematical model based on this physical model is obtained, and a numerical solution program is made. As an example, a practical launch and recovery system fbr an underwater robot is calculated by use of the program, and the motion track of the robot is obtained.

关键词： underwater vehicle launch recovery motion response mathematical model numerical calculation