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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 reliab 相似文献
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Zhang Zijun Zhang Zushu
Lecture Huazhong University of Science Technology Wuhan . Professor Huazhong University of Science Technology Wuhan 《中国海洋工程》1994,(1)
- In this paper a series of model experiments of resistance on buoys and mooring system components are described. The experiments include: experiments of hydrodynamic resistance on buoys and mooring system components, and experiment of air resistance on buoys in wind tunnel. The results are compared with the Beto's results (1980) and some analyses are conducted. The experimental results provide a reliable basis and some parameters for the design of deep sea mooring systems. 相似文献
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Sensitivity Analysis of Air Gap Motion with Respect to Wind Load and Mooring System for Semi-Submersible Platform Design 总被引：1，自引：1，他引：0
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 tuff work 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. 相似文献
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Hybrid model testing technique is widely used in verification of a deepwater floating structure and its mooring system,but the design of the truncated mooring systems which can reproduce both static and dynamic response same as the full-depth mooring system is still a big challenge,especially for the mooting systems with large truncation.A Cell-Tress Spar operated in 1500 m water depth is verified in a wave basin with 4 m water depth.A large truncation factor arises even though a small model scale 1:100 is adopted.Computer program modules for analyzing the static and frequency domain dynamic response of mooting line are combined with multi-objective genetic algorithm NSGA-II to optimize the truncared mooting system.Considering the asymmetry of layout of mooring hnes,two different truncated mooring systems are respectively designed for both directions in which the restoring forces of the.mooting system are quite,different.Not only the static characteristics of the mooting systems are calibrated,but also the dynamic responses of the single truncated mooting line are evaluated through time domain numerical simulation and model tests.The model test results of 100-year storm in the GOM are reconstructed and extrapolated to a full depth.It is found that the experimental and numerical resuits of Spar wave frequency motion agree well,and the dynamic responses of the full-depth mooring lines are better reproduced,but the low frequency surge motion is overestimated due to the smaller mooring-induced damping.It is a feasible method adopting different truncated mooring systems for different directions in which the restoring force characteristics are quite different and cannot be simulated by one truncated mooring system.Hybrid verification of a deepwater platform in wave basin with shallow water depth is still feasible if the truncated mooring systems are properly designed,and numerical extrapolation is necessary. 相似文献
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设计了一种新型网箱浮架系统,利用SESAM对其进行了频域水动力分析以及考虑不规则波浪、风、流载荷和系泊共同作用的时域耦合分析,并与传统双浮管网箱浮架系统进行了分析对比,得到方形网箱与圆形网箱的水动力特性的差异以及各自的优缺点,对实际中网箱的开发设计有一定的借鉴意义;通过计算,证明新型网箱浮架系统在工作海况能正常工作,在极端海况下也能满足安全性的要求;最后对4种常见系泊方式进行了时域耦合分析,得到了四种系泊方式的系泊特性,对实际工程中系泊方式的选择有一定的参考意义。 相似文献
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新型深海系泊系统及数值分析技术 总被引：7，自引：1，他引：7
随着海洋油气资源开发逐渐向深海转移,传统的悬链式系泊系统在技术和经济上遇到难以逾越的障碍。作为一种新型的适用于深水和超深水环境的系泊系统,绷紧索系泊系统面临广阔的应用前景。文章对这种新型系泊系统的发展情况进行了介绍,基于有限元数值分析技术,对系泊系统的两个关键特性,即系缆的绷紧-松弛特性以及纤维系缆的动刚度特性进行了分析和处理,通过算例考察了深海平台运动引起的系缆力响应。 相似文献
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Dynamics of large-truncated mooring systems coupled with a catenary moored semi-submersible 总被引：2，自引：2，他引：0
With the floating structures pushing their activities to the ultra-deep water,model tests have presented a challenge due to the limitation of the existing wave basins.Therefore,the concept of truncated mooring system is implemented to replace the full depth mooring system in the model tests,which aims to have the same dynamic responses as the full depth system.The truncated mooring system plays such a significant role that extra attention should be paid to the mooring systems with large truncation factor.Three different types of large truncation factor mooring system are being employed in the simulations,including the homogenously truncated mooring system,non-homogenously truncated mooring system and simplified truncated mooring system.A catenary moored semi-submersible operating at 1000 m water depth is presented.In addition,truncated mooring systems are proposed at the truncated water depth of 200 m.In order to explore the applicability of these truncated mooring systems,numerical simulations of the platform’s surge free decay interacting with three different styles of truncated mooring systems are studied in calm water.Furthermore,the mooring-induced damping of the truncated mooring systems is simulated in the regular wave.Finally,the platform motion responses and mooring line dynamics are simulated in irregular wave.All these simulations are implemented by employing full time domain coupled dynamic analysis,and the results are compared with those of the full depth simulations in the same cases.The results show that the mooring-induced damping plays a significant role in platform motion responses,and all truncated mooring systems are suitable for model tests with appropriate truncated mooring line diameters.However,a large diameter is needed for simplified truncated mooring lines.The suggestions are given to the selection of truncated mooring system for different situations as well as to the truncated mooring design criteria. 相似文献
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随着智能化研究成为当今科技发展的热点,结合智能优化算法的浮体系泊系统自动化设计成为一个将现代方法应用于传统工程领域并提高设计效率的研究对象。针对浮体的系泊系统,以悬链线式系泊方式为研究对象,分析得出了系泊缆与不同选材参数之间的规律,建立系泊系统自动化设计方法,选用遗传算法作为算法基础,实现方案的智能优选,进行了有效的探索研究;开发了系泊系统自动化设计的自主程序,完成了典型的单根系泊缆的单点系泊系统以及多段组成风分布式系泊系统的研究,验证了方法的可行性,为系泊系统的自动化设计这一技术问题提供了解决方法与工程的应用手段。 相似文献
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从提高锚泊系统收放时效性入手,提出了一种半潜式钻井平台复合式锚泊系统组分配比优化设计方法,旨在尽可能降低复合式锚泊系统的钢链配比长度,提高收放效率。结合锚泊系统设计参数,制定优化设计准则,建立优化分析流程,采用ANSYS-AQWA建立锚泊定位半潜式平台水动力分析模型,获得平台运动参数和锚链动力参数,对平台漂移量、锚链最小安全系数、走锚临界张力、锚链最小卧底长度和起锚力进行无量纲指标分析,并综合考虑张力倾角与预张力对优化结果的影响,获得复合式锚泊系统钢链与钢缆的最优配比关系,确定最优钢链长度为395 m,较原钢链长度缩短225 m,钢链收放时间降低36%,进一步提高锚泊系统收放时效性,并降低平台可变荷载。 相似文献
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《海洋技术学报》2023,(4)
浮标锚链因磨损而断裂会导致浮标丢失,所以针对浮标锚泊系统的研究对锚链设计具有重要意义。为解决锚链系泊力计算方法精度不足和锚链力学简化模型与锚链实际形态不一致的问题,通过VOF （Volume of Fluid） 界面捕捉法建立了三维风、浪耦合流场,基于流体力学计算软件STAR-CCM+对一种滚塑浮标及锚链进行数值仿真计算。在建立双链节锚链物理模型基础上,通过求解浮标在风、浪中的受力及浮标与锚链连接处的受力损失求取锚链系泊力。结果显示,风浪越大,锚链的系泊力损失越大,2、3、4 级海况下浮标阻力损失分别为17.1%、36.6%、55.8%。锚链的双链节受力并非均等,主受力链节在2、3 级海况时承担90%以上的锚链系泊力,次受力链节的系泊力随着总系泊力的增加而增加,可见双链节锚链规格应与单链节相同。 相似文献
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近年来,国内兴起了大力发展半潜式起重平台的势头,系泊系统的设计与优化是该类型平台开发中的关键问题之一。采用时域方法对半潜式起重平台系泊系统进行耦合动力分析,研究系泊系统主要参数对其动力响应特性的影响,并给出主要参数的设计优化流程,在此基础上,以能够满足安全校核且性能较优的系泊方案为目标,对该半潜式起重平台的系泊系统进行优化设计,并研究单根系泊缆发生破断对整个系泊系统的影响。结果表明:基于主要参数对系泊性能的影响规律,经优化设计得到的系泊方案,预留的安全欲度适中,能够保障半潜式起重平台在恶劣海况下的生存能力,同时具备较好的经济性。 相似文献
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Impact Analysis of Air Gap Motion with Respect to Parameters of Mooring System for Floating Platform
In this paper, the impact analysis of air gap concerning the parameters of mooring system for the semi-submersible platform is conducted. It is challenging to simulate the wave, current and wind loads of a platform based on a model test simultaneously. Furthermore, the dynamic equivalence between the truncated and full-depth mooring system is still a tuff work. However, the wind and current loads can be tested accurately in wind tunnel model. Furthermore, the wave can be simulated accurately in wave tank test. The full-scale mooring system and the all environment loads can be simulated accurately by using the numerical model based on the model tests simultaneously. In this paper, the air gap response of a floating platform is calculated based on the results of tunnel test and wave tank. Meanwhile, full-scale mooring system, the wind, wave and current load can be considered simultaneously. In addition, a numerical model of the platform is tuned and validated by ANSYS AQWA according to the model test results. With the support of the tuned numerical model, seventeen simulation cases about the presented platform are considered to study the wave, wind, and current loads simultaneously. Then, the impact analysis studies of air gap motion regarding the length, elasticity, and type of the mooring line are performed in the time domain under the beam wave, head wave, and oblique wave conditions. 相似文献
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Ma Peisun Ma Lie Lu Shunshou Associate Professor Shanghai Jiaotong University Shanghai Graduate Shanghai Jiaotong University Shanghai Engineer Shanghai Jiaotong University Shanghai 《中国海洋工程》1991,(4)
To fulfil the need of development of offshore oil floating production system, the performance of turret assembly in an inboard turret mooring system has been investigated in the paper. By means of systematic evaluation, the optimal structure of the turret for single-point mooring systems has been determined. Through model tests of a turret mooring system, several groups of data such as forces, moments and displacements under different environmental conditions have been obtained. Stresses and strains of the turret structure have been calculated by means of the finite element method corresponding to the situation in the model experiment. The study shows that the selected turret structure and the designed turret assembly are technically feasible. 相似文献
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系泊系统是半潜式支持平台抵抗恶劣海洋环境作用、限制平台偏移、实现海上定位的重要设备,辐射状多点系泊是常用的布置方式。针对该平台系泊系统开展了设计方法和分析流程研究,阐述了系泊系统配置设计,包括系泊缆的数量、抛出长度、单根系泊缆的刚度、直径、破断负荷、定位锚的型式、最大抓力等;系泊系统的布置设计,包括系泊缆之间的水平夹角、系泊绞车、导缆器、定位锚的位置等;同时归纳风载荷、流载荷以及波浪慢漂载荷的常用估算方法;总结适用于该类平台系泊系统设计的规范要求。将上述方法和流程应用于某型半潜式支持平台系泊系统的开发和设计,采用系泊定位分析程序MIMOSA对该系统的定位能力进行分析,研究了系泊缆形状、夹角等参数随张力的变化特征,同时系泊缆按照船级社的规范要求进行衡准,反复调整和优化系泊系统的配置和布置方式,直至系泊系统满足要求,最终设计出较合适的系泊系统。相关方法、流程和结论为实际工程项目提供重要的设计思路。 相似文献
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波浪能是一种清洁、可再生的新型能源,波浪能发电装置在海上作业时会受到变化的风、浪、流载荷作用,需要系泊系统保证其稳性和安全性。以适用于中国南海500 m水深的振荡双浮体式波浪能发电装置为研究对象,运用频域计算与时域计算结合的方法对双浮体及其系泊系统的运动响应和动力载荷进行计算,获取极端海况与工作海况下浮体运动和系泊缆索张力的时历数据。参照BV船级社NR-493规定的海上浮式结构物系泊安全系数规范,对3种系泊方案进行安全校核和对比分析。选定其中一种系泊方案,通过改变系泊系统以及能量转换器（PTO）的参数,探究参数变化对双体波浪能装置运动响应以及系泊系统特性的影响,为类似应用于深水的双体波浪能装置系泊系统的设计提供参考。 相似文献