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Dynamic Response Analysis of a Floating Mooring System

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Journal of Ocean University of China 2014年第3期13卷 381-389页

作者： LE Conghuan ding hongyan ZHANG Puyang State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Civil Engineering Tianjin University Key Laboratory of Coast Civil Structure Safety Ministry of Education Tianjin University

An innovative floating mooring system with two or more independent floating mooring platforms in the middle and one rigid platform on each side is proposed for improving efficiency and safety in shallow water. For this new system, most of collision energy is absorbed through the displacement of floating platforms. In order to illustrate the validity of the system, a series of model tests were conducted at a scale of 1:40. The coupled motion characteristics of the floating mooring platforms were discussed under regular and irregular waves, and the influences of wave direction and other characteristics on dynamic response of the system were analyzed. The results show that the mooring system is safest at 0° of wave incident angle, whereas the most dangerous mooring state occurs at 90° of wave incident angle. Motion responses increase with the increase of wave height, but are not linearly related to changes in wave height.

关键词： floating mooring system model test wave characteristics impact force motion response

Dynamic Coupling Analysis of Semisubmersible Platform Float-over Method for Docking Case

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Journal of Ocean University of China 2024年第2期23卷 345-357页

作者： ding hongyan QIN Licheng ZHANG Puyang SONG Zhengrong XIE Weiwei State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Offshore Oil Engineering Co. Ltd.Tianjin 300461China

In this paper,the multi-body coupled dynamic characteristics of a semisubmersible platform and an HYSY 229 barge were ***,coupled hydrodynamic analysis of the HYSY 229 barge and the semisubmersible platform was *** hydrodynamic parameters were obtained using the retardation function method of three-dimensional frequency-domain potential flow *** results of the hydrodynamic analysis were highly consistent with the test findings,verifying the accuracy of the multifloating hydrodynamic coupling analysis,and key hydrodynamic parameters were solved for different water depths and the coupling *** to the obtained results,the hydrodynamic influence was the largest in shallow waters when the coupling effect was ***,the coupled motion equation combined with viscous damping,fender system,and mooring system was established,and the hydrodynamics,floating body motion,and dynamic response of the fender system were *** analysis revealed good agreement among the surge,sway,and yaw motions of the two floating ***,when the wave period reached 10 s,the motion of the two floating bodies showed severe shock,and a relative motion was also ***,excessive constraints should be added between the two floating bodies during construction to ensure construction *** numerical analysis and model test results of the semisubmersible platform and HYSY 229 barge at a water depth of 42 m and sea conditions of 0°,45°,and 90° were in good agreement,and the error was less than 5%.The maximum movement of the HYSY 229 barge reached 2.61 m in the sway direction,whereas that of the semisubmersible platform was 2.11 *** construction,excessive constraints should be added between the two floating bodies to limit their relative movement and ensure construction safety.

关键词： float-over method semisubmersible platform coupling hydrodynamic fender system time-domain analysis

Shaking Table Tests and Seismic Response of Three-Bucket Jacket Foundations for Offshore Wind Turbines

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Journal of Ocean University of China 2022年第3期21卷 719-736页

作者： ding hongyan PAN Chen ZHANG Puyang WANG Le XU Yunlong State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin300072China Key Laboratory of Coast Civil Structure Safety Ministry of EducationTianjin UniversityTianjin300072China School of Civil Engineering Tianjin UniversityTianjin300072China

The seismic response characteristics of three-bucket jacket foundations for offshore wind turbines(OWTs)and the liquefaction of the surrounding soil are particularly important for the development and application of this type of structure for offshore *** the shaking table test and three-dimensional finite element analysis,different magnitudes of simulated earthquake waves were used as inputs to the shaking table to model seismic *** resulting changes in the excess pore water pressure and acceleration response of the soil under horizontal earthquake are compared in this *** of the anti-liquefaction shear stress and equivalent shearing stress during the earthquake,determination of the areas prone to liquefaction,and identification of the effect of the three-bucket jacket foundation on the soil liquefaction resistance were conducted by developing a soil-structure finite element *** development law of the soil’s amplification effect on seismic acceleration and the seismic response of the foundation soil under various magnitude earthquake waves were also *** indicate that liquefying the soil inside the bucket of the foundation is more difficult than that outside the bucket during the excitation of seismic waves due to the large upper load and the restraint of the surrounding *** finding confirms the advantages of the three-bucket jacket foundations in improving the liquefaction resistance of the soil inside the ***,the confinement has a barely noticeable impact on the nearby soil outside the *** phenomenon of soil liquefaction at the bottom of the skirt occurred earlier than that in other positions during the seismic excitation,and the excess pore water pressure slowly *** acceleration amplification coefficient of the sand outside the bucket increases with depth,but that of the sand inside the bucket is substantially inhibited in the height range of the bucket *** result pr

关键词： three-bucket jacket foundation seismic response shaking table test liquefaction analysis

Preliminary Design of a Submerged Support Structure for Floating Wind Turbines

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Journal of Ocean University of China 2020年第6期19卷 1265-1282页

作者： LE Conghuan ZHANG Jian ding hongyan ZHANG Puyang WANG Guilan State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300350China School of Civil Engineering Tianjin UniversityTianjin 300350China Key Laboratory of Coast Civil Structure Safety(Tianjin University) Ministry of EducationTianjin 300350China Fujian Provincial Investigation Design and Research Institute of Water Conservancy and HydropowerFuzhou 350000China

Cost-effective floating wind turbines with efficient installations are highly desired in deep waters(>50 m).This paper presents a submerged floating offshore wind turbines(SFOWT)concept for intermediate water depths(50-200 m).The performance of SFOWTs can be improved through a judicious choice of configuration,pretension,and mooring line *** SFOWTs with different configurations and a similar mass,named Cyl-4,Cub-4,Cyl-3,and Hex-3,were designed and *** responses of the four SFOWTs were predicted under operational condition and extreme *** results show that the four SFOWTs exhibited good performance under both *** effect of platform configurations on power output was negligible under the operational *** the extreme condition,among the four SFOWTs,the mean bending moments at the tower base were very close,while the maximum values differed by up to 21.5%,due to the *** effect of wind-wave misalignment under the extreme condition was further *** general,the motion performances of the four-pontoon SFOWTs,Cyl-4 and Cub-4,were superior to those of the three-pontoon SFOWTs,Cyl-3 and *** studies of the mooring system were carried out on Cub-4 with different mooring line pretensions and four mooring *** optimized Cub-4 could reduce the maximum motion responses in the surge,heave,and yaw by 97.7%,91.5%,and 98.7%,respectively.

关键词： floating offshore wind turbine structure design dynamic response aero-hydro-servo-elastic coupled analysis

Experimental Study on Horizontal Bearing Characteristics of Screw Pile

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Journal of Ocean University of China 2024年第6期23卷 1423-1435页

作者： LE Conghuan SUN Qingyuan ZHANG Puyang ding hongyan JIANG Quanmin State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China

The horizontal bearing capacity of the screw pile and monopile was analyzed by model *** showed that the horizontal bearing capacity of the screw pile was significantly greater than that of the monopile under the same loading *** the increase in horizontal loading speed,the ultimate horizontal bearing capacity of the two piles also increases,and the difference decreases ***,the influence of vertical loading on the horizontal bearing capacity of screw pile and monopile is studied at the horizontal loading speed of 2 mm *** findings indicate that vertical load evidently affects the horizontal bearing capacity of common piles,but slightly influences the horizontal bearing capacity of screw piles.

关键词： screw pile foundation horizontal bearing capacity vertical load model test

Penetration Tests of Multi-Bucket Foundation in Sand for Offshore Wind Turbines

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Journal of Ocean University of China 2023年第4期22卷 949-960页

作者： ZHANG Puyang QI Xin ZHANG Chao LE Conghuan ding hongyan State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China

Suction foundations are generally installed with negative pressures to overcome the resistance of soils and complete the penetration,but excessive negative pressures are also avoided to cause seepage *** this paper,the model test method was used to analyze the movement characteristics of multi-bucket foundations in the process of sinking in sand,and the common calculation methods of sinking resistances are *** critical negative pressure corresponding to the seepage failure of foundation was determined under the action of increasing negative pressure step by step and the characteristics of soil failure were *** calculation formula of critical suction in sand was verified in application,and according to the test results,the value of seepage coefficient was modified,which provides an example for the study of suction foundation in sand soils.

关键词： multi-bucket foundation penetration test penetration resistance critical suction seepage failure

Optimal Skirt Spacing for Subsea Skirted Foundation Considering Floating Stability

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Transactions of Tianjin University 2017年第5期23卷 445-450页

作者： hongyan ding Yan Zhu Puyang Zhang Conghuan Le State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300072 China Key Laboratory of Coast Civil Structure Safety of Ministry of Education Tianjin University Tianjin 300072 China School of Civil Engineering Tianjin UniversityTianjin 300072 China

A hydraulics model is built in Moses to find the optimal internal skirt spacing for the maximum floating stability of the skirted foundation. The results show that the increase in the internal skirts’ number can help improve the floating stability of the skirted foundation. However, with the increase in the internal skirts’ number, the improvement of floating stability becomes more and more weak. In this study, an optimal number of four are found for the internal skirt spacing. Moreover, to testify the feasibility of internal skirt spacing, a practical project is modeled, which indicates that the optimal internal skirt spacing can satisfy the requirements of towing. © 2017, Tianjin University and Springer-Verlag Berlin Heidelberg.

关键词： Foundations

Effects of BMP-2 Patterns on Bovine Chondrocytes Adhesion and Alignment

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Journal of Wuhan University of Technology(Materials Science) 2014年第5期29卷 1057-1062页

作者：潘长江 ZHANG Bingbing ZHANG Man DONG Yunxiao ding hongyan Jiangsu Provincial Key Laboratory for Interventional Medical Devices Huaiyin Institute of Technology College of Bioengineering Chongqing University

Striped bone morphogenetic protein-2 （BMP-2） patterns are created on polystyrene （PS） surfaces by microcontact printing （μCP） to investigate the influences of the protein patterns on bovine chondrocytes behaviors. Due to the excellent ability of BMP-2 to recruit cells and the limited ability of blank PS areas to bind ceils, bovine chondrocytes preferentially attach on the protein areas, leading to formation of cell patterns and elongated cell morphologies to some degree. The BMP-2 protein stripe can guide bovine chondrocytes adhesion and alignment. The pattern dimensions can significantly affect the cell adhesion and spread. The protein stripe width mainly controls the cell elongation and orientation while the pattern spacing mainly affects the cell spread towards neighboring stripes. Therefore, the cell morphology and distribution direction can be controlled by precisely designing the pattern shapes and sizes. We believe that the present study could fred applications for surface modification of biomaterials＇ surfaces to create the bioactive patterns to control chondrocytes adhesion, spreading and even cell function. It may be helpful for the development of novel biomaterials for cartilage repair.

关键词： protein pattern chondrocyte cartilage

Failure Envelopes of Wide-Shallow Composite Bucket Foundation for Offshore Wind Turbines in Silty Sand

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Transactions of Tianjin University 2018年第2期24卷 182-190页

作者： Yonggang Liu Yaohua Guo hongyan ding Puyang Zhang State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University School of Civil Engineering Tianjin University

The wide-shallow composite bucket foundation(WSCBF) is a new type of offshore wind power foundation that can be built on land and rapidly installed offshore, there by effectively reducing the construction time and costs of offshore wind power foundation. In this study, the horizontal bearing capacity is calculated by finite element simulation and compared with test results to verify the validity of results. In this process, the vertical load and bending load are respectively calculated by the finite element simulation. Under the vertical load effect, the bucket foundation and the soil inside are regarded as a whole, and the corresponding buckling failure mode is obtained. The ultimate vertical bearing capacity is calculated using empirical and theoretical formulas; the theoretical formula is also revised by finite element results. Under bending load, the rotational center of the composite bucket foundation(in a region close to the bucket bottom) gradually moves from the left of the central axis(reverse to loading direction) to the nearby compartment boards along the loading direction. The H–M envelope line shows a linear relationship, and it is determined that the vertical and bending ultimate bearing capacities can be improved by an appropriate vertical load.

关键词： Wide-shallow composite bucket foundation Silty sand Off shore wind turbines