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Experimental Study on New Multi-Column Tension-Leg-Type floating wind turbine

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China Ocean Engineering 2018年第2期32卷 123-131页

作者： ZHAO Yong-sheng SHE Xiao-he HE Yan-ping YANG Jian-min PENG Tao KOU Yu-feng State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200030China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai Jiao Tong UniversityShanghai 200030China Shanghai University of Engineering Science School of ManagementShanghai 201620China

Deep-water regions often have winds favorable for offshore wind turbines, and floating turbines currently show the greatest potential to exploit such winds. This work established proper scaling laws for model tests, which were then implemented in the construction of a model wind turbine with optimally designed blades. The aerodynamic,hydrodynamic, and elastic characteristics of the proposed new multi-column tension-leg-type floating wind turbine(wind Star TLP system) were explored in the wave tank testing of a 1:50 scale model at the State Key Laboratory of Ocean Engineering at Shanghai Jiao Tong University. Tests were conducted under conditions of still water, white noise waves, irregular waves, and combined wind, wave, and current loads. The results established the natural periods of the motion, damping, motion response amplitude operators, and tendon tensions of the wind Star TLP system under different environmental conditions, and thus could serve as a reference for further research.

关键词： floating wind turbine model test windS tar TLP dynamic response

Research on the Influence of Helical Strakes on Dynamic Response of floating wind turbine Platform

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China Ocean Engineering 2017年第2期31卷 131-140页

作者： DING Qin-wei LI Chun School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai 200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093 China

The stability of platform structure is the paramount guarantee of the safe operation of the offshore floating wind turbine. The NREL 5MW floating wind turbine is established based on the OC3-Hywind Spar Buoy platform with the supplement of helical strakes for the purpose to analyze the impact of helical strakes on the dynamic response of the floating wind turbine Spar platform. The dynamic response of floating wind turbine Spar platform under wind, wave and current loading from the impact of number, height and pitch ratio of the helical strakes is analysed by the radiation and diffraction theory, the finite element method and orthogonal design method. The result reveals that the helical strakes can effectively inhibit the dynamic response of the platform but enlarge the wave exciting force; the best parameter combination is two pieces of helical strakes with the height of 15%D （D is the diameter of the platform） and the pitch ratio of 5; the height of the helical strake and its pitch ratio have significant influence on pitch response.

关键词： floating wind turbine platform helical strakes orthogonal design

Coupled Dynamic Response Analysis of A Multi-Column Tension-Leg-Type floating wind turbine

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China Ocean Engineering 2016年第4期30卷 505-520页

作者：赵永生杨建民何炎平顾敏童 State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University

This paper presents a coupled dynamic response analysis of a multi-column tension-leg-type floating wind turbine（wind Star TLP system） under normal operation and parked conditions. wind-only load cases, wave-only load cases and combined wind and wave load cases were analyzed separately for the wind Star TLP system to identify the dominant excitation loads. Comparisons between an NREL offshore 5-MW baseline wind turbine installed on land and the wind Star TLP system were performed. Statistics of selected response variables in specified design load cases（DLCs） were obtained and analyzed. It is found that the proposed wind Star TLP system has small dynamic responses to environmental loads and it thus has almost the same mean generator power output under operating conditions as the land-based system. The tension mooring system has a sufficient safety factor, and the minimum tendon tension is always positive in all selected DLCs. The ratio of ultimate load of the tower base fore-aft bending moment for the wind Star TLP system versus the land-based system can be as high as 1.9 in all of the DLCs considered. These results will help elucidate the dynamic characteristics of the proposed wind Star TLP system, identify the difference in load effect between it and land-based systems, and thus make relevant modifications to the initial design for the wind Star TLP system.

关键词： floating wind turbine windStar TLP coupled dynamic response operating andparked condition

Comparisons of Wave Force Model Effects on the Structural Responses and Fatigue Loads of a Semi-Submersible floating wind turbine

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Journal of Ocean University of China 2024年第1期23卷 69-79页

作者： HAN Yanqing LE Conghuan ZHANG Puyang XU Shengnan State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Hydraulic Engineering Ludong UniversityYantai 264025China School of Civil Engineering Tianjin UniversityTianjin 300072China Shandong Marine Aerospace Equipment Technological Innovation Center Yantai 264004China

The selection of wave force models will significantly impact the structural responses of floating wind *** this study,comparisons of wave force model effects on the structural responses and fatigue loads of a semi-submersible floating wind turbine(SFWT)were *** were performed by employing the Morison equation(ME)with linear or second-order wave kinematics and potential flow theory(PFT)with first-or second-order wave forces.A comparison of regular waves,irregular waves,and coupled wind/waves analyses with the experimental data showed that many of the simulation results and experimental data are relatively ***,notable discrepancies are found in the response amplitude operators for platform heave,tower base bending moment,and tension in mooring *** models give more satisfactory results of heave but more significant discrepan-cies in tower base bending moment than the ME *** irregular wave analyses,low-frequency resonances were captured by PFT models with second-order difference-frequency terms,and high-frequency resonances were captured by the ME models or PFT models with second-order sum-frequency *** force models capture the response frequencies but do not reasonably predict the response *** coupled wind/waves analyses showed more satisfactory results than the wave-only ***,an important detail to note is that this satisfactory result is based on the overprediction of wind-induced responses.

关键词： floating wind turbine wave force model potential flow theory Morison equation second-order wave forces

An Integrated Structural Strength Analysis Method for Spar Type floating wind turbine

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China Ocean Engineering 2016年第2期30卷 217-230页

作者：胡志强刘毅王晋 State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China China National Offshore Oil Corporation Research Institute Beo'ing 100028China COTEC Offshore Engineering Solution HoustonTexas 77079USA

An integrated structural strength analysis method for a Spar type floating wind turbine is proposed in this paper,and technical issues related to turbine structure modeling and stress combination are also *** NREL-5MW ＂Hywind＂ Spar type wind turbine is adopted as study ***-domain dynamic coupled simulations are performed by a fully-coupled aero-hydro-servo-elastic tool,FAST,on the purpose of obtaining the dynamic characteristics of the floating wind turbine,and determining parameters for design load cases of finite element *** design load cases are identified,and finite element analyses are performed for these design load *** structural stresses due to wave-induced loads and wind-induced loads are calculated,and then combined to assess the structural strength of the floating wind *** feasibility of the proposed structural strength analysis method for floating wind turbines is then validated.

关键词： floating wind turbine structural strength analysis method dynamic coupled simulation finite element analysis

Dynamic Response Analysis of Semi-Submersible floating wind turbine with Different Wave Conditions

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Energy Engineering 2023年第11期120卷 2531-2545页

作者： Mingzhen Jiang Guanghui Qiao Jiwen Chen Xuemei Huang Leian Zhang Yongshuang Wen Yuhuan Zhang School of Mechanical Engineering Shandong University of TechnologyZibo255049China Testing Center Lianyungang Zhongfulianzhong Composite Material Group Co.Ltd.Lianyungang222000China Engineering and Technology Department Sinoma Sci&Tech Co.Ltd.Funing224400China Testing Center Shandong Provincial Key Laboratory of Precision Manufacturing and Special ProcessingZibo255049China

To address the problem of poor wave resistance of existing offshore floating wind turbines,a new type of semisubmersible platform with truncated-cone-type upper pontoons is proposed by combining the characteristics of offshore wind turbine semi-submersible floating *** on the coupled hydrodynamic,aerodynamic,and mooring force physical fields of FAST,the surge,heave,pitch,and yaw motions responses of the floating wind turbine under different wave heights and periods are obtained,and the mooring line tension responses are also obtained;and compare the dynamic response of the new semi-submersible platform with the OC4-DeepCwind platformat six degrees of *** results show that different wave conditions have obvious effects on the heave and pitch motions of the new floating wind turbine,and fewer effects on the surge and yaw motions;the tensegrity response of the mooring system is more affected by the wave conditions;compared with the OC4-DeepCwind floating wind turbine,the pitch and roll response of the new floating wind turbine has been significantly reduced and has good stability.

关键词： floating wind turbine semi-submersible platform wave loading different wave conditions dynamic response

Time-domain floater stress analysis for a floating wind turbine

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Journal of Ocean Engineering and Science 2023年第4期8卷 435-445页

作者： Zhen Gao Daniel Merino Kai-Jia Han Haoran Li Stian Fiskvik School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityChina Department of Marine Technology Norwegian University of Science and TechnologyNorway COWI Energy International COWINorway DNV AS HøvikNorway College of Harbour Coastal and Offshore EngineeringHohai UniversityChina

There are increasing focuses on developing cost-effective floating wind turbines,for which efficient stress analysis methods are needed for floater structural *** of the today’s studies focus on global analysis methods in which the floater is assumed as a rigid body or multiple rigid bodies and the stress distributions in the floater cannot be directly *** part of the COWI Fonden funded EMULF project,a summary about the methodology,the numerical modeling procedure and the verification for stress response analysis of a semi-submersible floater for a 15MW wind turbine is *** analy-sis procedure includes the regeneration of the hydrodynamic pressure loads on the external wet surface of the floater due to wave diffraction,radiation and hydrostatic pressure change,and the application of these pressure loads,together with the time-varying gravity due motions,the inertial loads and the forces/moments at the boundaries(*** bottom and mooring line fairleads)of the floater to obtain the deformation and the stresses of the floater in the time *** analysis procedure is imple-mented in a developed MATLAB code and the DNV software *** importance of the different hydrodynamic pressure components was discussed considering representative sea states.A verification of the obtained stress time series and statistics using this method against the regeneration from a linear frequency-domain approach was made considering irregular wave actions only,and a very good agree-ment was *** developed methodology can provide an efficient solution for structural design analysis of floating wind turbines.

关键词： floating wind turbine Floater stress analysis Hydrodynamic pressure Coupled dynamic analysis

Mooring Damage Identification of floating wind turbine Using a Non-Probabilistic Approach Under Different Environmental Conditions

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Journal of Marine Science and Application 2021年第1期20卷 156-169页

作者： Pooya Hajinezhad Dehkharghani Mir Mohammad Ettefagh Reza Hassannejad Faculty of Mechanical Engineering University of TabrizTabriz ***Iran

This paper discusses the damage identification in the mooring line system of a floating wind turbine(FWT)exposed to various environmental *** proposed method incorporates a non-probabilistic method into artificial neural networks(ANNs).The non-probabilistic method is used to overcome the problem of *** this purpose,the interval analysis method is used to calculate the lower and upper bounds of ANNs input *** data contains some of the natural frequencies utilized to train two different ANNs and predict the output data which is the interval bounds of mooring line ***,in order to reduce computational time and more importantly,identify damage in various conditions,the proposed method is trained using constant loads(CL)case(deterministic loads,including constant wind speed and airy wave model)and is tested using random loads(RL)case(including Kaimal wind model and JONSWAP wave theory).The superiority of this method is assessed by applying the deterministic method for damage *** results demonstrate that the proposed non-probabilistic method identifies the location and severity of damage more accurately compared to a deterministic *** superiority is getting more remarkable as the difference in uncertainty levels between training and testing data is increasing.

关键词： Damage identification floating wind turbine Artificial neural networks Non-probabilistic method Uncertainties

Optimization Design of TMD for Vibration Suppression of Offshore floating wind turbine

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International Journal of Plant Engineering and Management 2015年第1期20卷 13-27页

作者： HU Ya-qi HE Er-ming ZHANG Yang School of Aeronautics Northwestern Polytechnical University

In order to suppress the responses of the large vibration displacements and loads of the offshore floating wind turbine under the harsh marine environment, an effect method for restraining vibration, putting tuned mass dampers （TMD） in the cabin of wind turbine, is proposed in this paper. A dynamics model for offshore floating wind turbine with a fore-aft TMD is established based on Lagrange equation; Parameter identification of the wind turbine is performed by the non-linear least squares Levenberg-Marquardt （LM） algorithm; Parameter optimization of the TMD is researched when considering the standard deviation of the tower top longitudinal displacements as the objective function. Aiming at five typical combined wind and wave load cases under normal running state of the wind turbine, the dynamic responses of the wind turbine with/without TMD are simulated and the suppression effect of the TMD is investigated. The results show that ： there exists the optimum TMD mass ratio 1.8% when the damped free vibration of the wind turbine, and the standard deviation of the tower top longitudinal displacements is decreased 60% in 100 seconds by the optimized TMD. The standard deviation suppression rates of the longitudinal displacements and loads about the tower and blades increase with the increasing TMD mass ratio when the wind turbine vibration under the combined wind and wave load cases, and when the mass ratio changes from 0.5% to 2%, the maximum suppression rates are from 20% to 50%, which effectively reduce the vibration responses of the wind turbine. The research results of this paper preliminarily verify the feasibilities of using TMD for restraining vibration of the offshore floating wind turbine

关键词： floating wind turbine dynamic models dynamic response structural control optimization tunedmass damper (TMD)