共查询到20条相似文献，搜索用时 31 毫秒
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Kawaguchi K. Hirata K. Nishida T. Obana S. Mikada H. 《Oceanic Engineering, IEEE Journal of》2002,27(2):182-192
Although submarine cable in-line seafloor observation systems are very effective tools for real-time/long-term geo-scientific measurements,, there are technological difficulties for deploying as many sensors as on land. To solve this problem, JAM-STEC developed an expandable and replaceable satellite measurement station called the adaptable observation system (AOS). The AOS is a battery operated mobile observatory connected to the backbone cable system by a 10 km long thin fiber cable to ensure real-time data recovery. The system consists of a branching system, a junction box, a fiber cable, and a battery system for a six-month operation. Installation and construction of the AOS will be conducted by a towed vehicle and an ROV. A thin fiber cable-laying system was developed and tested for practical operation. This observation system provides a chance to extend existing seafloor networks from an in-line area to a wider area 相似文献
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本文论述了珠江口珠海－深圳海底光缆路由设计,建设所涉及的主要技术问题,解决了港湾内海缆路由勘设及施工遇到的多种复杂的实际难题,为今后港湾内海缆建设提供参考。 相似文献
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Mark A. Grosenbaugh Walter Paul Dan Frye Norman Farr 《Oceanic Engineering, IEEE Journal of》2006,31(3):574-584
We consider an alternative to traditional high-modulus synthetic electro-optical-mechanical (EOM) mooring cables that are being used in single-point moorings for deep-ocean observatories. The alternative cable design is based on using low-modulus nylon or polyester fibers as the strength member. High-modulus EOM cables such as those that use Vectran fibers as the strength member are usually constructed with the conductors and optical fibers in the core and the strength member on the outside. The key aspect of the new design is that the strength member is placed in the center of the cable and the conductors and fibers are wrapped around the outside at a high helix angle to accommodate stretching of the center-strength-member. A comparison of the static and dynamic responses of moorings constructed with nylon, polyester, and Vectran EOM cables (for mooring scopes of 1.1 and 1.2 and deployment depths of 1800, 3000, and 5000 m) shows that the maximum total tensions of moorings made with nylon EOM cables are lowest under all conditions. Differences between the nylon and the Vectran EOM cable moorings are due principally to the differences in the dynamic tensions. Differences between the nylon and the polyester EOM cable moorings are due mainly to differences in static tensions caused by the higher specific gravity of polyester fibers. Reduction in the scope of all the moorings from 1.2 to 1.1 resulted in significantly higher tensions for the polyester and Vectran EOM cable moorings but only slightly higher tensions for the nylon EOM cable moorings 相似文献
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Dynamic Analysis of Towed and Variable Length Cable Systems 总被引：2，自引：3，他引：2
Towed cable systems are frequently used in marine measurements where the length of the towed cable varies during launch and recovery. In this paper a novel method for modeling variable length cable systems is introduced based on the finite segment formulation. The variable length of the towed cable is described by changing the length of the segment near the towing point and by increasing or decreasing the number of the discrete segments of the cable. In this way, the elastic effects of the cable can be easily handled since geometry and material properties of each segment are kept constant. Experimental results show that the dynamic behavior of the towed cable is consistent between the model and the physical cable. Results show that the model provides numerical efficiency and simulation accuracy for the variable length towed system. 相似文献
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海坛海峡海底光缆建设是一项加强海坛岛与大陆之间通信的工程。本文介绍了勘察的光缆路由区地形地貌及沉积结构,并分析了相应的水动力情况,在明该段路由区宜于埋设海底光缆,但不同地段的水动力和沉积结构等有异,光缆埋设的深度应有所不同。 相似文献
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讨论了水下机器人远程通信光纤微缆的动力学问题,研究分析了在海洋层流条件下水下机器人的运动对光纤微缆张力的影响,在仿真分析的基础上提出了对光纤微缆收放系统的设计要求并给出了概念设计方案。 相似文献
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While the civil engineering facilities of hydraulic power plants such as dam, water intake, waterway, etc., are usually submerged, there are few effective methods for their inspection. So we at Mitsui Ocean Development and Engineering Co., Ltd. (MODEC) have developed a new remote-controlled inspection system named "MURS-300 MK II" (MODEC Unmanned Remote-Controlled Submersible for 300-m water depth) in cooperation with Tokyo Electric Power Co., Inc. This MK II system, which consists of a submersible vehicle with a TV camera and a still camera, a handling system, a control van, and a composite cable with optical fibers, was designed, developed, and successfully evaluated at the end of 1984. This new system will find many applications to the inspection of nuclear and thermal power stations, offshore platforms, etc., as well as hydraulic power plants. 相似文献
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The Hawaii-2 Observatory 总被引：2，自引：0，他引：2
Petitt R.A. Jr. Harris D.W. Wooding B. Bailey J. Jolly J. Hobart E. Chave A.D. Duennebier F. Butler R. Bowen A. Yoerger D. 《Oceanic Engineering, IEEE Journal of》2002,27(2):245-253
A permanent deep ocean scientific research facility-the Hawaii-2 Observatory (H2O)-was installed on the retired HAW-2 commercial submarine telephone cable in September 1998. H2O consists of a seafloor submarine cable termination and junction box in 5000 m of water located halfway between Hawaii and California. The H2O infrastructure was installed from a large research vessel using the Jason ROV and standard over-the-side gear. The junction box provides two-way digital communication at variable data rates of up to 80 kbit/s using the RS-422 protocol and a total of 400 W of power for both junction box systems and user equipment. Instruments may be connected by an ROV to the junction box at 8 wet-mateable connectors. The H2O junction box is a "smart" design, which incorporates redundancy to protect against failure and allows full control of instrument functionality from shore. Initial instrumentation at the H2O site includes broad-band seismometer and hydrophone packages 相似文献
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通过对路由区海域的海底地形、地貌、浅层沉积结构的探测及对其自然环境资料的综合分析，在中韩两国之间选择了一条条件最佳的光缆路线，并对其环境进行了全面分析与评价 相似文献
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《Oceanic Engineering, IEEE Journal of》2009,34(4):539-547
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海洋缆体系统的统一凝集参数时域分析法 总被引：19，自引：5，他引：19
提出了海洋缆一体系统的三维动态性能时域分析法，并给出了计算机程序。采用凝集参数法模拟了缆一体结构系统，缆为圆形截面，可伸长，不考虑弯曲刚度，采用了四阶龙格一库塔法积分系统运动方程，计算了二个实例以验证程序的可靠性，程序可用于系泊，拖曳，潜器脐带缆等具有组合成分的海洋缆体系统的初步设计。 相似文献
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A numerical method for the dynamic simulation of towed cables is presented. The cable is loaded by fluid drag, tension, gravity and buoyancy, including the effects of weights and floats. The development of a cable can be simulated as well as the separation of a cable under excessive load and the subsequent behavior of the broken parts. The system is constructed from a set of generic elements representing such items as cable or rope strands, knots (reference points on rope sections), kinks (sliding reference points on cable sections that change length), cable ends and winches. A mathematical graph organizes these elements in a general and flexible fashion: it allows construction of complex systems and permits structural redefinition during the simulation. The nodes of the graph coincide with the various reference points of the problem, at which physical parameters are lumped and to which sets of ordinary differential equations are associated that define the motions of the points. The links of the graph describe the physical connections between the nodes. Application of new methods for solving stiff, sparse systems of coupled ordinary differential equations enables efficient simulation of snap-loads and other severe events. Results are presented that compare quantitatively with laboratory measurements. A further example shows the behavior of a breaking cable that is qualitatively reasonable. 相似文献
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The suction anchor has been widely used in taut or semi-taut mooring systems as an effective and economical solution to anchoring problems. To ensure high reliability, the profile of the mooring cable connecting the fairlead and the pad-eye must be accurately designed. However, previous studies have rarely considered the effect of cable slippage in soil on the mooring behavior, or embedded cables have been studied with an assumed tension at the seabed. This paper, by treating the cable suspended in water and the cable embedded in soil as a single cable, presents a two-dimensional (2D) static model and a three-dimensional (3D) quasi-static model for the cable during pretensioning and in service, respectively. The two models take into account the comprehensive effects of ocean currents, soil resistance and cable elasticity, all of which are critical for the design of a mooring system. Three examples are analyzed using the models and some useful conclusions are drawn. 相似文献
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In order to design submarine optical-fiber cable, it is very important to clarify the cable tension and fiber elongation during laying because the fiber elongation allowance is very small. When submarine cable is being laid from a cable ship, cable weight in water plus such additional tension as bottom tension caused by the negative slack and tension due to ship motion work upon the cable [1]. Cable tension changes during laying were theoretically studied. This paper quantitatively clarifies bottom tension dependence at the touchdown point caused by the negative slack upon both water depth and ship velocity. It is shown that the shallower the water depth is and the faster the ship velocity is, the larger the bottom tension is. The theoretical bottom tension showed good agreement with the experimental value measured during sea trials on laying submarine optical-fiber cable [2], [3]. This paper also describes the correlation between cable, ship motion, and cable tension vibration by examining experimental results. It quantitatively clarifies the tension vibration magnitude. 相似文献
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比较了两种石英光纤以及不同芯径的光纤对水体光谱测量的影响。通过对水体光谱的实地测量,发现芯径为0.6mm、数值孔径(NA)为0.37的PCS光纤,在波长为350～550nm之间透光量的GER信号损耗较小,与镜头测量值曲线的相似性较好,光纤接入光谱仪的实测值达到原配4度视场角镜头测量值的20%,而0.4mm的PCS光纤以及大芯径光纤,分别只能达到镜头测量值的15%和5%。10m长的芯径为0.6mm的PCS光纤弯折(半径为30cm)后其GER信号仍能达到镜头信号的15%,符合光谱测量的要求。 相似文献
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To perform geophysical and multidisciplinary real-time measurements on the ocean floor, it has been attempted to reuse decommissioned submarine cables. The VENUS project reuses the TPC-2, which is one of these systems and runs across the entire Philippine Sea Plate between Guam Island and Okinawa Island. The VENUS system comprises an ocean floor observatory, a submarine cable, and a land system. The major components of the ocean floor observatory are geophysical instruments and a telemetry system. There are seven scientific instrument units including broadband seismometers and a hydrophone array. Digital telemetry using the old analog telephone cable obtains high data accuracy and real-time accessibility to data from a laboratory on land. The bottom-telemetry system and a part of sensor units were installed at a depth of 2157 m on the landward slope of the Ryukyu (Nansei-Syoto) Trench on August 29, 1999. The data from the hydrophone array and tsunami gauge have been correctly transmitted to the data center. The rest of the scientific instruments will be deployed by deep-tow equipment and a remotely operated vehicle. Using a decommissioned submarine cable will greatly reduce construction costs compared to using a new cable system 相似文献
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The dynamic analysis of a pipe system is one of the most crucial problems for the entire mining system.A discrete element method(DEM)is proposed for the analysis of a deep-ocean mining pipe system,including the lift pipe,pump,buffer and flexible hose.By the discrete element method,the pipe is divided into some rigid elements that are linked by flexible connectors.First,two examples representing static analysis and dynamic analysis respectively are given to show that the DEM model is feasible.Then the three-dimensional DEM model is used for dynamic analysis of the mining pipe system.The dynamic motions of the entire mining pipe system under different work conditions are discussed.Some suggestions are made for the actual operation of deep-ocean mining systems. 相似文献