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Sensitivity Analysis of Air Gap Motion with Respect to Wind Load and mooring system for Semi-Submersible Platform Design

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China Ocean Engineering 2016年第4期30卷 535-548页

作者：霍发力聂焱杨德庆董刚崔锦 Jiangsu University of Science and Technology Zhenjiang 212003China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Grenland Group(China)Ltd. Shanghai 201206China

A design of semi-submersible platform is mainly based on the extreme response analysis due to the forces experienced by the components during lifetime. The external loads can induce the extreme air gap response and potential deck impact to the semi-submersible platform. It is important to predict air gap response of platforms accurately in order to check the strength of local structures which withstand the wave slamming due to negative air gap. The wind load cannot be simulated easily by model test in towing tank whereas it can be simulated accurately in wind tunnel test. Furthermore, full scale simulation of the mooring system in model test is still a tuffwork especially the stiffness of the mooring system. Owing to the above mentioned problem, the model test results are not accurate enough for air gap evaluation. The aim of this paper is to present sensitivity analysis results of air gap motion with respect to the mooring system and wind load for the design of semi-submersible platform. Though the model test results are not suitable for the direct evaluation of air gap, they can be used as a good basis for tuning the radiation damping and viscous drag in numerical simulation. In the presented design example, a numerical model is tuned and validated by ANSYS AQWA based on the model test results with a simple 4 line symmetrical horizontal soft mooring system. According to the tuned numerical model, sensitivity analysis studies of air gap motion with respect to the mooring system and wind load are performed in time domain. Three mooring systems and five simulation cases about the presented platform are simulated based on the results of wind tunnel tests and sea-keeping tests. The sensitivity analysis results are valuable for the floating platform design.

关键词： mooring system air gap semi-submersible platform radiation damping viscous drag

Performance analysis of the mooring system of a two-module scientific research and demonstration platform

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Journal of Hydrodynamics 2021年第5期33卷 901-914页

作者： Xin-yun Ni Xiao-ming Cheng Bo Wu Jun Ding Yong-lin Ye Ze Sun China Ship Scientific Research Center Wuxi 214082China

A mooring system has been designed for the position keeping of a two-module semi-submersible platform which is connected by hinge-type *** the excitation of ocean waves,the relative motion between the two modules can be *** is therefore no longer adequate to model the platform as a single rigid body in the analysis of the performance of the mooring *** this study,an analysis method has been developed based on the three-dimensional frequency domain hydroelasticity theory in conjunction with the time domain quasi-static analysis method of mooring actions,which takes into account of the coupling effect of the platform motion and mooring *** proposed method is verified by comparing the numerical results with the measured data obtained from the on-site *** comparison shows a good agreement,and demonstrates the feasibility and effectiveness of the proposed method for the analysis of the module responses and mooring tensions of multi-module floating platforms.

关键词： mooring system coupled analysis sea trial verification two-module floating platform hydroelasticity theory numerical comparison

Design of mooring system for Oil Storage Vessels

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China Ocean Engineering 2003年第4期18卷 541-550页

作者： LI Wen-long(李文龙) TAN Jia-hua(谭家华) School of Naval Architecture and Ocean Engineering Shanghai Jiao Tong University Shanghai200030 China School of Naval Architecture and Ocean EngineeringShanghai Jiao Tong University Shanghai200030 China

The floating oil storage system has been proposed as a new facility for Strategic Petroleum Reserve (SPR) in China. mooring is one of the key technologies to ensure the safety, reliability, and performance of the oil storage system. This paper describes the concept, analysis, design and reliability of the mooring system. For mooring system design of these oil vessels, analysis is essential of the behavior of the vessel in connection with mooring facilities of nonlinear resilience. A nonlinear mathematical model for analyzing a moored vessel is established and solved. Some results of numerical simulations are presented. Assessment of the safety regarding the mooring system in terms of failure probability is carried out. Another simulation model for calculating the failure probability of the mooring system is proposed. The design parameters that have an influence on the characteristics of the failure probability have been identified. The simulation results,show that the mooring system has an annual reliability value of 0.999998. The proposed simulation method is proved to be effective in quantitative evaluation of the safety of the mooring system for floating oil storage vessels.

关键词： petroleum reserve oil storage vessels mooring system design nonlinear numerical simulation safety assessment

Safety Assessment for a Side-by-side Offloading mooring system

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Journal of Marine Science and Application 2011年第3期10卷 315-320页

作者： Liping Sun Qiang He Shangmao Ai College of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China

In order to improve the safety properties of an offloading system with side-by-side （SBS） mooring in which the FPSO is moored by a yoke system in the field of BZ25-1, it is necessary to analyze those properties. According to the experience of similar projects, tow strategies of different offioading arrangements were discussed by using the 3-D radiation/diffraction theory and quasi-static time domain method to assess their respective safety properties. Through the safety assessment analysis of different arrangement comparisons, various ways to improve the safety properties of off＇loading systems with side-by-side mooring were verified by analyzing the tension in the mooring lines and the fender deflection. Through comparison it can be concluded that by enlarging the key factors properly, including the size of the fenders and the hawsers as well as the number of hawsers, a better safety performance can be achieved.

关键词： hydrodynamic interaction damping lids yoke system quasi static time domain mooring system

Design and Control Scheme of the mooring system

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Journal of Contemporary Educational Research 2022年第5期6卷 108-114页

作者： Jing Cong Basic Department of Liaoning Institute of Science and Technology Benxi 117000Liaoning ProvinceChina

In this paper,by analyzing the design and control scheme of the mooring system based on theoretical mechanics,force analysis is conducted on the buoy,steel pipe,steel drum,and anchor chain,and a reasonable mathematical model is constructed to solve the problems of the inclination angle of the steel drum and each section of the steel pipe,the shape of the anchor chain,the draft of the buoy,and the swimming area under different wind speeds,thus providing a reliable basis for the design of the system.

关键词： mooring system Static balance Force analysis Catenary

Motion Performance and mooring system of a Floating Offshore Wind Turbine

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Journal of Marine Science and Application 2012年第3期11卷 328-334页

作者： Jing Zhao Liang Zhang Haitao Wu Institute of Ocean Renewable Energy system Harbin Engineering University Harbin 150001 China

The development of offshore wind farms was originally carried out in shallow water areas with fixed （seabed mounted） structures. However, countries with limited shallow water areas require innovative floating platforms to deploy wind turbines offshore in order to harness wind energy to generate electricity in deep seas. The performances of motion and mooring system dynamics are vital to designing a cost effective and durable floating platform. This paper describes a numerical model to simulate dynamic behavior of a new semi-submersible type floating offshore wind turbine （FOWT） system. The wind turbine was modeled as a wind block with a certain thrust coefficient, and the hydrodynamics and mooting system dynamics of the platform were calculated by SESAM soRware. The effect of change in environmental conditions on the dynamic response of the system under wave and wind loading was examined. The results indicate that the semi-submersible concept has excellent performance and SESAM could be an effective tool for floating wind turbine design and analysis.

关键词： floating offshore wind turbine semi-submersible platform platform motion mooring dynamics mooring system

The motion performance and mooring system of deepwater semi-submersible drilling unit

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Journal of Marine Science and Application 2009年第3期8卷 233-236页

作者：冯珩孙春梅陈正伟洪学福中国石油集团海洋工程有限公司北京100176

This paper analyzes the motion performance and mooring system of deepwater semi-submersible drilling unit in the district of the South China Sea using the MOSES procedure system. After the 3-D panel model of the unit was built, the 3-D diffraction-radiation theory was used to obtain the hydrodynamic loads on the wet surfaces and the response amplitude operators （RAO） of the unit. According to the environmental data, the short-term motion response to motion performance of the unit is predicted by the spectral method. Then a time-domain calculation was done to analyze the motion of the unit with its mooring system. The research results can be a reference for the model test of unit.

关键词： deepwater semi-submersible drilling unit motion response response amplitude operators (RAO) mooring system

A Nonlinear Restoring Effect Study of mooring system and its Application

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Journal of Marine Science and Application 2012年第1期11卷 74-82页

作者： Jian Zhang (1) zhangjian_102@*** Huilong Ren (1) Lijie Zhang (2) College of Shipbuilding Engineering Harbin Engineering University Tianjin Centrans Shipping Management Co. Ltd.

mooring system plays an important role in station keeping of floating offshore structures. Coupled analysis on mooring-buoy interactions has been increasingly studied in recent years. At present, chains and wire ropes are widely used in offshore engineering practice. On the basis of mooring line statics, an explicit formulation of single mooring chain/wire rope stiffness coefficients and mooring stiffness matrix of the mooring system were derived in this article, taking into account the horizontal restoring force, vertical restoring force and their coupling terms. The nonlinearity of mooring stiffness was analyzed, and the influences of various parameters, such as material, displacement, pre-tension and water depth, were investigated. Finally some application cases of the mooring stiffness in hydrodynamic calculation were presented. Data shows that this kind of stiffness can reckon in linear and nonlinear forces of mooring system. Also, the stiffness can be used in hydrodynamic analysis to get the eieenfrequencv of slow drift motions.

关键词： coupled analysis nonlinear restoring force mooring system lower frequency drift motion

Stability of mooring system Based on Linear Complementarity system Theory

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Stability of Mooring System Based on Linear Complementarity ...