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Effect of Al_2O_3on Structure and Wearability of Composite Coating

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Journal of Iron and Steel Research International 2004年第3期11卷 59-62页

作者： ding hong-yan ZHANG Yue Nanjing University of Aeronautics and Astronautics Huaiyin Institute of Technology

The composite coating was prepared by thermal spray welding after making composite powder,which is composed of Ni-based self-melted alloy and AlOceramic powder including nano,sub-micron and micron *** influences of contents and sizes of AlOon the structure and wearability were *** results show that the wear resistance of the coating would be increased greatly by adding AlO,but the spray weldability decreases with increasing *** there is an optimal content of *** composite coating with AlOnano or sub-micron powder of 0.5% has the best abrasive resistance,while the optimal content of AlOmicron powder is 1 %.

关键词： ceramic powder thermal spray welding composite coating Al2O3 nano-powder

Structure and Mechanical Properties of Ni-P-Nano Al_2O_3 Composite Coatings Synthesized by Electroless Plating

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Journal of Iron and Steel Research International 2008年第1期15卷 65-69页

作者： ZHOU Guang-hong ding hong-yan ZHOU Fei ZHANG Yue Department of Mechanical Engineering Huaiyin Institute of Technology Huai＇an 223001 Jiangsu China Institute of Bio-inspired Structure and Surface Engineering Academy of Frontier Science Nanjing University of Aeronautics and Astronautics Nanjing 210016 Jiangsu China

Ni-P-nano Al2O3 composite coatings were deposited by electroless plating,and their microstructures were observed by SEM（scanning electron microscope）.The microhardness and the wear resistance of the Ni-P-nano Al2O3 composite coatings were measured using microhardness tester and block-on-ring tribometer,respectively,and the comparison with those of Ni-P coatings or Ni-P-micro Al2O3 coating was *** influences of aging temperature on their hardness and wear resistance were *** results showed that the nano Al2O3 particles were distributed uniformly in the Ni-P-Al2O3 *** three kinds of Ni-P based coatings,the hardness and wear resistance of Ni-P-nano Al2O3 coatings were largest,and the maximum values could be obtained at 400 ℃.This indicated that the precipitation of nano Al2O3 particles would improve the hardness and wear resistance of the Ni-P coatings.

关键词： composite coating nano Al2O aging treatment mechanical property

Integrated Towing Transportation Technique for Offshore Wind Turbine with Composite Bucket Foundation

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China Ocean Engineering 2022年第1期36卷 133-143页

作者： ding hong-yan FENG Zun-tao ZHANG Pu-yang LE Cong-huan State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Key Laboratory of Coast Civil Structure Safety Ministry of EducationTianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China

Composite bucket foundation and one-step installation technology for offshore wind turbine are the integration of foundation construction,transportation and whole installation at *** cost of offshore wind turbine construction and installation has been largely *** stability is the key technology in the process of towing *** observation data can reflect the real state of the *** this paper,the influence of water depth and towing speed on liquid level,the compartment pressure,and the pitch angles during towing of composite bucket foundation are *** data are analyzed based on the field measurements data from a 3.3 MW offshore wind power project in *** results show that with varied water depths and towing speeds,the compartment pressure changes are small during the bucket foundation towing *** offshore wind turbine composite bucket foundation is stable while being towed in the ocean.

关键词： composite bucket foundation towing transportation field measurements stability

Collision Analysis Between Spudcan and Seabed During the Process of Jack-up Platform Lowering Jack-up Legs

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China Ocean Engineering 2021年第5期35卷 779-788页

作者： LE Cong-huan LI yan-e HUANG Lei REN Jian-yu ding hong-yan ZHANG Pu-yang State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China China Classification Society(CCS) Tianjin 300457China

In the leg-lowering process,the offshore jack-up platform is in a floating state,and the spudcan may collide with the seabed due to the platform motion in waves,thereby threatening the safety and stability of the *** paper first analyzed the hydrodynamic response of a jack-up platform under different sea *** a finite-element model was established which considered the material and geometrical nonlinearity in the structure and the nonlinear interaction between soil and structure to investigate the collision response between the spudcan and seabed during lowering jack-up *** results show that the dynamic response of the platform decreases and gradually tends to be stable as the wave period *** motion response of the platform reach the largest value when the wave period is 8 s and the wave direction is 0°.The collision angle between the spudcan and seabed has a large influence on the collision response,while the velocity of leg-lowering has little influence on the collision *** collision response is also significantly affected by soil *** clay,the increase in undrained shear strength and Young’s modulus will increase the impact force.

关键词： jack-up platform spudcan collision dynamic response

Shaking Table Tests of Four-Bucket Jacket Foundation for Offshore Wind Turbines

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China Ocean Engineering 2022年第6期36卷 849-858页

作者： ding hong-yan LI Jing-yi LE Cong-huan PAN Chen ZHANG Pu-yang State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China

As the offshore wind turbine foundation,the four-bucket jacket foundation has a large stiffness and the structure is difficult to be damaged under seismic ***,the saturated subsoil of the four-bucket jacket foundation tends to be liquefied under earthquake,which greatly affects the safety of offshore wind ***,the seismic performance of four-bucket jacket foundation is mainly reflected in the anti-liquefaction capacity of foundation *** this paper,the liquefaction resistance of sandy soil of four-bucket jacket foundation for offshore wind turbine is *** liquefaction and dynamic response of sandy soil foundation of four-bucket jacket foundation under seismic load are obtained by carrying out the shaking table test,and the influence mechanism of four-bucket jacket foundation on the liquefaction resistance of sandy soil foundation is analyzed.

关键词： four-bucket jacket foundation sand liquefaction shaking table test seismic response

Study on Seepage Characteristics of Composite Bucket Foundation Under Eccentric Load

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China Ocean Engineering 2021年第1期35卷 123-134页

作者： CHEN Qing-shan ZHANG Pu-yang ding hong-yan LE Cong-huan XU Yun-long State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Key Laboratory of Coast Civil Structure Safety(Tianjin University) Ministry of EducationTianjin 300072China

Under the effect of eccentric loads,when the suction pressure of the composite bucket foundation is leveled,the seepage failure is very easy to *** seepage failure occurrence causes the foundation to settle unevenly and impairs the bearing *** study uses ABAQUS finite element software to establish a composite bucket foundation model for finite element *** model simulates the seepage of the foundation penetrating process under eccentric load to reveal the induced seepage characteristics of the bucket *** most vulnerable position of seepage failure under the eccentric loading is *** suction formulas for different offset eccentric moment strategies are derived and compared with existing literature *** the derived formula is supplemented and corrected according to the pressure difference between adjacent *** can be drawn:(1)Under eccentric loads,the critical suction decreases about 7%−10%.(2)The pressure difference between adjacent cabins impacts significantly on the seepage field,and the critical suction,at most,can be reduced by 17.56%.(3)the offset strategies have little effect on the seepage *** and appropriate strategies can be selected to meet the requirement of leveling in engineering project.

关键词： composite bucket foundation eccentric load seepage failure critical suction

Model Tests Research on A Float-Over Barge in Shallow Water Under the Undocking Conditions

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China Ocean Engineering 2021年第6期35卷 933-942页

作者： QIN Li-cheng ding hong-yan ZHANG Pu-yang LI Huai-liang YU Wen-tai State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China China Offshore Oil Engineering Company Limited Tianjin 300461China

In this study,the Jinzhou 9-3 CEPD float-over installation project was *** the undocking condition,the water depth of the motion path of the working barge gradually changed from 10.31 m to 9.41 *** undocking clearance of the HYSY 228 is smaller than 1 m;therefore,the barge shows highly nonlinear hydrodynamic characteristics,and it is difficult to be accurately simulated by numerical ***,it is necessary to obtain the hydrodynamic characteristics and laws of the float-over barge at different water depths by using tank model test,to provide some reference and guidance for float-over operations in shallow water.

关键词： float-over installation shallow water effect undocking conditions model test

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

Experimental Study on Influencing Factors of Motion Responses for Air-Floating Tetrapod Bucket Foundation

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China Ocean Engineering 2022年第2期36卷 258-267页

作者： LIU Xian-qing LE Cong-huan ZHAO Ming-jie ding hong-yan ZHANG Pu-yang LV Nan LUO Sheng National Engineering Research Center for Inland Waterway Regulation Chongqing Jiaotong UniversityChongqing 400074China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Department of Military Facilities Army Logistics University of PLAChongqing 401331China

Air floating transport is one of the key construction technologies of bucket *** influences of draft,water depth and bucket spacing on the motion response characteristics of tetrapod bucket foundation(TBF)during air-floating transportation were studied by models *** results showed that with the increase of draft,the natural periods of heave motion increased,while the maximum amplitudes of oscillating motion *** maximum amplitudes of heave motion decreased while pitch motion increased with the increasing of water depth;further,the period range of oscillating amplitude close to the maximum amplitude was expanded due to shallow water *** increasing bucket spacing,the maximum amplitudes of heave motion first increase and then decreased,whereas the maximum amplitudes of pitch motion ***,the favorable air-floating transportation performance can be achieved by choosing a larger bucket spacing under the condition of meeting the design requirements and reducing the draft under shallower water.

关键词： tetrapod bucket foundation response amplitude operator(RAO) draft water depth spacing air-floating