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Dynamic Performance of a Semi-Submersible Platform Subject to Wind and Waves

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Journal of Ocean University of China 2011年第2期10卷 127-134页

作者： ZHU Hang ou jinping School of Civil Engineering Harbin Institute of Technology Harbin 150090 P. R. China School of Civil and Hydraulic Engineering Dalian University of Technology Dalian 116023 P. R. China

By applying experimental and numerical simulations, the motion performance of a semi-submersible platform with mooring positoning system under combined actions of wind and waves is studied. The numerical simulation is conducted by the method of nonlinear time domain coupled analysis, and the mooring forces are calculated by the piecewise extrapolating method. The scale in the model experiment is 1:100, and the mooring system of the model is designed with the method of equivalent water-depth truncation by comparing the numerical and the experimental results, the platform motion and mooring forces subject to wind and waves are investigated. The results indicate that the numerically simulated mooring forces agree well with the experimental results in static equivalent field, but show some difference in dynamic equivalent field; the numerically simulated platform motions coincide well with the experimental results. The maximum motion of the platform under operating conditions is 20.5 m. It means that the horizontal displacement is 2% less than the water depth, which satisfies the operating requirements.

关键词： semi-submersible platform wind waves numerical simulation experimental simulation

Hydroelastic Analysis of a Very Large Floating Structure Edged with a Pair of Submerged Horizontal Plates

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Journal of Ocean University of China 2015年第2期14卷 228-236页

作者： MA Zhe CHENG Yong ZHAI Gangjun ou jinping Deepwater Engineering Research Center Dalian University of Technology

This paper is concerned with the hydroelastic problem of a very large pontoon-type floating structure(VLFS) edged with a pair of submerged horizontal plates, which is a combination of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. For the hydroelastic analysis, the fluid is assumed to be ideal and its motion is irrotational so that a velocity potential exists. The VLFS is modeled as an elastic plate according to the classical thin plate theory. The fluid-structure interaction problem is separated into conventional hydrodynamics and structure dynamics by using modal expansion method in the frequency-domain. It involves, firstly, the deflection of the VLFS, which is expressed by a superposition of modal functions and corresponding modal amplitudes. Then the boundary element method is used to solve the integral equations of diffraction and radiation on the body surface for the velocity potential, whereas the vibration equation is solved by the Galerkin's method for modal amplitudes, and then the deflection is obtained by the sum of multiplying modal functions with modal amplitudes. This study examines the effects of the width and location of the non-perforated horizontal plates on the hydroelastic response of the VLFS, then the performance of perforated plates is investigated to reduce the motion near the fore-end of the VLFS. Considering the advantages and disadvantages of submerged plates without and with cylindrical holes, we propose a simple anti-motion device, which is a combination of a pair of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. The effectiveness of this device in reducing the deformation and bending moment of the VLFS has been confirmed, and is compared with the results in cases without and with the submerged horizontal plates by the analysis in this paper.

关键词： VLFS anti-motion device hydroelastic problems perforate horizontal plate submerged horizontal plate

A novel durable intelligent fiber reinforced polymer anchor with embedded optical fiber Bragg grating sensors

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Science China(Technological Sciences) 2012年第5期55卷 1455-1462页

作者： HUANG MingHua ZHou Zhi YUE Shuai HE JianPing ou jinping School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Faculty oflnfrastructure Engineering Dalian University of TechnologyDalian 116024China

Anchors are the key members of the geotechnical anchorage engineering, it is urgent to monitor their behavior in service for preventing the potential risks. This paper proposes a novel durable intelligent fiber reinforced polymer （FRP） anchor to understand the behavior of the anchor in the field application. Series of optical fiber Bragg grating （FBG） sensors were embedded into the central axis along the anchor to sense itself axial strain variations. An evolution model of axial strain was also developed to evaluate the behavior along the anchor. A demonstration test was carried out to test its self-sensing properties in the laboratory. The experimental results indicated that the embedded FBG sensors monitored the behavior, e.g. axial strairl/interfacial damage evolutions along the anchor and displacement/applied load at the pulling end effectively, without influence from the interfacial compression and slip effects.

关键词： anchor fiber reinforced polymer optical fiber Bragg grating evolution model structural health monitoring

The typhoon effect on the aerodynamic performance of a floating offshore wind turbine

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Journal of Ocean Engineering and Science 2017年第4期2卷 279-287页

作者： Zhe Ma Wei Li Nianxin Ren jinping ou Deepwater Engineering Research Center Dalian University of TechnologyDalian 116024China State Key Laboratory of Coast and Offshore Engineering Dalian University of TechnologyDalian 116024China Offshore Wind Power R&D Center Hydrochina Huadong Engineering CorporationHangzhou 310014China Beijing’s Key Laboratory of Structural Wind Engineering and Urban Wind Environment Beijing Jiaotong UniversityBeijing100044China

The wind energy resource is considerably rich in the deep water of China South Sea,where wind farms have to face the challenge of extreme typhoon *** this work,the typhoon effect on the aerodynamic performance of the 5MW OC3-Hywind floating offshore wind turbine(FOWT)system has been investigated,based on the Aero-Hydro-Servo-Elastic FAST ***,considering the full field observation data of typhoon“Damrey”is a long duration process with significant turbulence and high wind speed,so one 3-h representative truncated typhoon wind speed time history has been ***,the effects of both the(variable-speed and collective-pitch)control system of NREL 5 MW wind turbine and the motion of the floating platform on the blade aerodynamic performance of the FOWT system during the representative typhoon time history has been investigated,based on blade element momentum(BEM)theory(coupled with potential theory for the calculation of the hydrodynamic loads of the Spar platform).Finally,the effects of different wind turbine control strategies,control parameter(KP-KI)combinations,wave heights and parked modes on the rotor aerodynamic responses of the FOWT system have been *** extreme typhoon event can result in considerably large extreme responses of the rotor thrust and the generated power due to the possible blade pitch angle error *** active-parked strategy has been proposed for reducing the maximum aerodynamic responses of the FOWT system during extreme typhoon events.

关键词： Typhoon Floating offshore wind turbine Aerodynamic performance Control system FAST

Experimental study on flutter stability of a long-span bridge subject to wind-rain actions

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Science China(Technological Sciences) 2013年第8期56卷 2089-2098页

作者： XIN DaBo LI Hui ou jinping WANG Liang CHEN DongYing School of Civil Engineering Harbin Institute of Technology School of Civil & Hydraulic Engineering Dalian University of Technology School of Construction Engineering Heilongjiang Institute of Technology

Based on the free vibration test method for extracting flutter derivatives,an experiment on flutter stability of a long-span bridge under simultaneous actions of wind and rain was carried out in a wind tunnel.A separated twin-box girder section model was employed as the *** flutter derivatives and critical flutter wind speed of this girder subject to both wind and rain(with various rainfall intensities,wind speeds and attack angles)were obtained,then the flutter stability of the bridge influenced by rainfall was *** results showed that the flutter derivatives of this bridge depend on the angles of attack of wind flow in the wind and rain ***,rainfall has great effect on three flutter derivatives(H2*,H4* and A4*)and has less effect on other three flutter derivatives(H1*,H3* and A3*).With the increasing rainfall density,the critical flutter velocity first increases and then *** density of rainfall has the effect of increasing mass,stiffness and damping on bridge decks,and higher density of rainfall has the effect of random inhomogeneous impact on bridge decks.

关键词： flutter long-span bridge simultaneous actions of wind and rain wind tunnel test

Windborne debris damage prediction analysis

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Frontiers of Structural and Civil Engineering 2010年第3期4卷 326-330页

作者： Fangfang SONG jinping ou Department of Urban&Civil Engineering Harbin Institute of Technology Shenzhen Graduate SchoolShenzhen 518055China School of Civil and Hydraulic Engineering Dalian University of TechnologyDalian 116024China

Windborne debris is one of the most important causes of the envelop destruction according to the postdamage *** problem of windborne debris damage could be summarized as three parts,including windborne debris risk analysis,debris flying trajectories,and impact resistance of envelope *** method of debris distribution is *** flying trajectories of compact and plate-like debris are solved by using a numerical method according to the different aerodynamic *** impact resistance of the envelopes is also ***,the process of windborne debris damage analysis is described in *** example of industrial building is given to demonstrate the whole method by using the observed data of typhoon Chanchu(2006).The method developed in this paper could be applied to risk assessment of windborne debris for structures in wind hazard.

关键词： typhoon windborne debris structural envelopes damage estimation

Wireless sensing experiments for structural vibration monitoring of offshore platform

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Frontiers of Electrical and Electronic Engineering in China 2008年第3期3卷 333-337页

作者： Yan YU jinping ou School of Civil Engineering Harbin Institute of TecnologyHarbin 150090China Institute of Microelectronics Dalian University of TechnologyDalian 116024China Department of Civil Engineering Dalian University of TechnologyDalian 116024China

In order to validate the feasibility of applying wireless sensing technique to structural monitoring of offshore platform,the experiment of wireless sensor network on offshore platform is presented in this ***,wireless sensor network and its topology structure is put forward,and the design of sensor nodes,base station,communication protocol is discussed according to selfdeveloped wireless sensor ***,true offshore platform and its experimental model are ***,wireless sensing experiment for offshore platform structure is completed and the analysis of the experimental result is *** research shows that wireless sensor network applied to offshore platform can reflect the vibration of the structure;the sensor nodes are fixed and removed expediently,which saves the cost of signal line as well as installation time.

关键词： wireless sensor offshore platform acceleration structural monitoring

Wave Forces and Moments on a Gravity Pier Foundation

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Journal of Shanghai Jiaotong university(Science) 2019年第3期24卷 305-312页

作者： WEI Chengxun ZHou Daocheng ou jinping School of Civil Engineering Dalian University of Technology

In order to understand the wave forces and moments on a gravity pier foundation which consists of an upper column and a bottom gravity base,a model experiment with a scale of 1:60 has been conducted in a laboratory flume.A corresponding numerical calculation by using the boundary element method has been carried out to provide a comparative *** is shown by the comparisons that the numerical wave forces and moments agree well with the experimental *** is proved that the wave forces and moments acting on the foundation are completely in their inertia dominative areas for wave *** the diffraction effects considered into the inertia item,appropriate inertia coefficients are assessed by the experimental results for the inertia item of the Morison *** formula of the inertia item can be used to estimate wave forces and moments on such gravity foundations.

关键词： gravity pier foundation model experiment wave forces and moments numerical calculation inertia coefficient

Numerical Study on Global Motion of Truss Spar in Frequency and Time Domains for the Liwan 3-1 Area

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Journal of Ocean University of China 2011年第2期10卷 113-121页

作者： LI Lu LI Binbin ou jinping Faculty of Infrastructure Engineering Dalian University of Technology Dalian 116024 P. R. China School of Civil Engineering Harbin Institute of Technology Harbin 150090 P. R. China

Using frequency and time domain analysis, the authors analyzed the hydrodynamics and motion behavior of a Truss Spar platform at a water depth of 1500 m in the Liwan 3-1 area of the South China Sea. Firstly, the seakeeping ability is acquired in the frequency domain by calculating the hull's hydrodynamics and comparing with a semi-submersible platform. The random wave analysis for 100-year, 10-year and 1-year return periods in Liwan 3-1 distinctly shows lower heave but larger surge and pitch re-sponses of the Truss Spar than those of a semi-submersible. Secondly, 3-hour motions of the Truss Spar are predicted and compared in the time domain under 100-year return period conditions in Liwan 3-1 and the Gulf of Mexico. Thirdly, the hull/mooring line cou-pled and uncoupled models are compared. Finally, the responses of the Truss Spar under 10-year and 1-year return period conditions are assessed. The results reveal that the mooring line damping reflected by the coupled model distinctly decreases the low frequency motion. The maximum heave response for 100-year return period waves is 1.23m and below 0.1m for the case of 1-year return period.

关键词： Truss Spar South China Sea hydrodynamics semi-submersible mooring line