Numerical and experimental study on hydrodynamic interaction of side-by-side moored multiple vessels   总被引：2，自引：0，他引：2  

S.Y. Hong  J.H. Kim  S.K. Cho  Y.R. Choi  Y.S. Kim 《Ocean Engineering》2005,32(7):783-801

This paper aims to investigate the basic interaction characteristics of side-by-side moored vessels both numerically and experimentally. A higher-order boundary element method (HOBEM) combined with generalized mode approach is applied to analysis of motion and drift force of side-by-side moored multiple vessels (LNG FPSO, LNGC and shuttle tankers). Model tests were carried out for the same floating bodies investigated in the numerical study in regular and irregular waves. Global and local motion responses and drift forces of three vessels are compared with those of calculations. Discussions is highlighted on applicability of numerical method to prediction of sophisticated multi-body interaction problem of which motion behavior is very important to analysis of mooring dynamics of deep sea floating bodies.  相似文献   

Analytical investigations on loop-manoeuvre of underwater towed cable-array system   总被引：3，自引：0，他引：3  

Srivastava Shyam Kishore  C. Ganapathy 《Applied Ocean Research》1996,18(6):353-360

The paper reports on analytical case studies on the loop manoeuvre of an underwater towed cable-array system to give an insight into the tactical aspects of their naval applications. The analytical formulation and the solution procedure adopted for this three dimensional dynamic problem is also described. The case studies have been carried out for different loop radii, tow lengths, tow speeds and truncated loops. The resulting X,Y,Z co-ordinates of the towed cable-array and tow-point tensions have been computed. Based on these results, the tow-length to loop radii ratio, leading to cable-array system looping, has been found. The values of speed reduction and turning radius, causing dangerous relaxation in tow-point tension have been worked out. After exit from the loop, the timing required for realignment of the cable-array system with the ship's heading can be obtained from plots of the results. These timings help to plan ship manoeuvres to optimise reestablishment of stable listening conditions during underwater surveillance.  相似文献   

海洋专用CTD单芯电缆传输技术研究     

李红志  邓云 《海洋技术学报》2005,24(3):30-35

对单芯电缆传输这种通讯技术的原理进行了阐述;分析提出了部分电路、部件的技术指标;作为一种数据传输的手段,对单芯电缆传输技术在海洋专用CTD中的应用进行了相关论述.  相似文献   

Nonlinear coupled dynamic response of offshore Spar platforms under regular sea waves     

A. K. Agarwal  A. K. Jain 《Ocean Engineering》2003,30(4):492-551

Many innovative floating offshore structures have been proposed for cost effectiveness of oil and gas exploration and production in water depths exceeding one thousand meters in recent years. One such type of platform is the offshore floating Spar platform. The Spar platform is modelled as a rigid body with six degrees-of-freedom, connected to the sea floor by multi-component catenary mooring lines, which are attached to the Spar platform at the fairleads. The response dependent stiffness matrix consists of two parts (a) the hydrostatics provide restoring force in heave, roll and pitch, (b) the mooring lines provide the restoring force which are represented here by nonlinear horizontal springs. A unidirectional regular wave model is used for computing the incident wave kinematics by Airy’s wave theory and force by Morison’s equation. The response analysis is performed in time domain to solve the dynamic behavior of the moored Spar platform as an integrated system using the iterative incremental Newmark’s Beta approach. Numerical studies are conducted for sea state conditions with and without coupling of degrees-of-freedom.  相似文献   

Test Study on Current Force on Mooring Ships     

Zhang Furan  Zhao Jun Zhang Xueqin Assistant Researcher  Tianjin Research Institute of Water Transport Engineering  Tianjin Assistant Engineer  Tianjin Research Institute of Water Transport Engineering  Tianjin 《中国海洋工程》1993,(2)

In respect of an offshore berthing pillar, the test study result of current force acting on mooring ships is described in this paper. Empirical and semi-empirical relationships of current force coefficient are given according to the angle between the flow direction and the ship's longitudinal axis, which are coincident with the result of theoretical analysis.  相似文献   

对称式布置锚链系统的线性化处理   总被引：6，自引：2，他引：6  

陈徐均  沈庆等 《海洋工程》2002,20(1):75-79

用悬链线方程求解了不同锚链状态的锚链力 ,并用多项式回归了锚链力与锚固点位移的关系 ,由此求得锚链恢复力刚度系数。分析了对称式布置锚链系统的非线性程度 ,阐述对称式布置锚链系统所提供的恢复力作线性化处理的可行性及方法 ,并给出了对称布置锚链系统的线性刚度矩阵。为各类受对称式布置锚链系统约束的浮动结构物的动力分析提供了理论依据  相似文献   

青岛市大气污染时间序列分析预报方法研究   总被引：5，自引：0，他引：5  

黄磊  王赐震  王建华  于鹏 《中国海洋大学学报(自然科学版)》2001,31(1):14-20

根据青岛市大气污染监测资料 ,采用时间序列分析方法 ,建立多种预报模型 ,有原序列周期外延法、均生函数周期外延法、均生函数逐步回归法以及自回归预报法等 ,最后提出一种综合预报模型。连续预报试验表明 ,综合预报模型优于任何个别预报模型 ,有较好的预报能力。利用马尔可夫概型对污染状态 (轻、中、重 )进行了分级预报试验 ,也获得良好的效果。  相似文献   

一个简单食物链的能流实验   总被引：1，自引：0，他引：1  

杨纪明  周名江  李军 《海洋科学》1995,19(1):67-68

食物链能量转换是生态系统的主要功能之一。海洋生物生产就是海洋食物链能量流动的一种表现形式。它把来自以藻类为主的植物性生产，通过被食－取食多级转换，形成了贝、虾、鱼等各级动物性生产，这就为人类提供了丰富的渔业资源。海岸带水域是我国目前海洋开发的主攻目标，揭示这个海区中食物链能流转移过程，对其经济生物生产力估算和开发前景预测有着重要意义。测定自然条件下海洋食物链能流是极其困难的。借助实验结果进而推算，就比较方便。本研究选择我国海岸带水域中属于不同营养级的４个经济种，构成一个简单的人工食物链，即金藻（…  相似文献   

深海资料浮标体及系泊系统的阻力试验研究   总被引：1，自引：0，他引：1  

张子俊  张祖枢 《海洋技术学报》1993,12(3):7-15

本文结合国家“七五”重点科技攻关项目“深海资料浮标”研制而进行浮标体和系泊系统的各种阻力试验研究，试验成果已直接应用于深海资料浮标系泊系统设计。实践表明本文介绍的各种阻力试验结果是可靠的。  相似文献   

埕岛油田海上石油平台基础冲刷研究   总被引：6，自引：1，他引：6  

仲德林  刘建立 《海岸工程》2003,22(2):37-43

海洋石油平台的建立会改变平台周围的水动力条件，其中平台的基础及与之连接的海底管缆(输油管道、注水管道、海底电缆等)附近产生冲刷现象，对平台和海底管缆的安全造成威胁。根据对研究区典型平台的4次实洲水深并结合以往资料，分析了埕岛油田海上石油平台基础冲刷的过程及其规律。  相似文献