检索结果-南通市图书馆

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

在线全文

学校读者我要写书评

暂无评论

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

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

在线全文

学校读者我要写书评

暂无评论

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 Towing Characteristics of Composite Bucket Wellhead Platform

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第3期38卷 531-542页

作者： zhang pu-yang LIU Ying-fei LE Cong-huan DING Hong-yan BAI Yu State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China

With the rapid development of large-scale development of marginal oilfields in China,simple wellhead platforms that are simple in structure and easy to install have become an inevitable choice in the process of oilfield ***,traditional simple wellhead platforms are often discarded after a single *** pursuit of a more costeffective approach to developing marginal oilfields,this paper proposes a new offshore oil field development facility—an integrated bucket foundation for wellhead *** verify the safety of its towing behavior and obtain the dynamic response characteristics of the structure,this paper takes a bucket integrated bucket foundation for wellhead platform with a diameter of 40 m as the research *** combining physical model tests and numerical simulations,it analyzes the static stability and dynamic response characteristics of the structure during towing,complete with the effects of the draft,wave height,wave period,and towing point height,which produce the dynamic responses of the structure under different influence factors,such as roll angle,pitch angle,heave acceleration and towing force as well as the sensibility to transport *** results show that the integrated bucket foundation for wellhead platform is capable of self-floating towing,and its movement is affected by the local environment,which will provide a reference for actual projects.

关键词： composite bucket foundation wellhead platform air flotation towing model test

Stochastic Analysis of Short-Term Structural Responses and Fatigue Damages of A Submerged Tension Leg Platform Wind Turbine in Wind and Waves

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2021年第4期35卷 566-577页

作者： HAN Yan-qing LE Cong-huan zhang pu-yang DANG Li FAN Qing-lai School of Civil Engineering Ludong UniversityYantai 264025China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Institution of Cross-sea Engineering Ludong UniversityYantai 264025China

In connection with the design of floating wind turbines,stochastic dynamic analysis is a critical task considering nonlinear wind and wave *** study the random structural responses of a newly designed submerged tension leg platform(STLP)wind turbine,a set of dynamic simulations and comparison analysis with the MIT/NREL TLP wind turbine are carried *** signal filter method is used to evaluate the mean and standard deviations of the structural ***,the extreme responses are estimated by using the mean upcrossing rate *** fatigue damages for blade root,tower,and mooring line are also studied according to the simulated *** results and comparison analysis show that the STLP gives small surge and pitch motions and mooring line tensions in operational sea states due to the small water-plane ***,in severe sea states,the STLP gives lower extreme values of platform pitch,slightly larger surge and heave motions and better towerbase and mooring line fatigue performances than those of the MIT/NREL *** is found that the STLP wind turbine has good performances in structural responses and could be a potential type for exploiting the wind resources located in deep waters.

关键词： stochastic analysis signal filter mean upcrossing rate fatigue damage equivalent load

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

在线全文

学校读者我要写书评

暂无评论

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

Study on Seepage Characteristics of Composite Bucket Foundation Under Eccentric Load

在线全文

学校读者我要写书评

暂无评论

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

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

在线全文

学校读者我要写书评

暂无评论

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

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

在线全文

学校读者我要写书评

暂无评论

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

Air-Floating Towing Behaviors of Multi-Bucket Foundation Platform

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2013年第5期27卷 645-658页

作者：乐丛欢丁红岩张浦阳 State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University School of Civil Engineering Tianjin University Key Laboratory of Coast Civil Structure Safety Ministry of Education Tianjin University

Air-floating towing beha viors of multi-bucket foundation plat form （MBFP） are investigated with the 1/20-scale model tests and hydrodynamic so ftware MOSES. MOSES numerical model was val idated by test results, and M OSES prototype model of MBFP can eliminate scale effect of model. The influences of towing factors of to wing speed, water depth, freeboard, and w ave direction on air-floating tow ing stability of MBFP were analyzed by model tests and validated MOSES prototype mod el. It is sho wn that the re duction of towing sp eed can effectively d ecrease the to wing force and surge acceleration to improve towing stability. Water depth is another f actor in towing s tability. Obvious shallow water effect will appear in shallow water with sma ll water depth-draft ratio and it w ill disappear gradually and air-floating towing becomes more stable with the increase of water depth. Accelerations of surge, s way and heave are small and they have modest changes when freeboard increases from 0.5 to 2 m. For MBFP, the freeboard is not suggested to be larger than 2 m in following wave. Wave direction has large influence on the towing stability, the surge acceleration and towing force are sensitive to the va riation of wave direction, the surge acceleration and towing force in following wave （0°） and counter wave （180°） are much larger than that in transverse sea （90°and 270°）.

关键词： air-floating towing MOSES model tests towing speed water depth freeboard wave direction