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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Ocean Engineering and Technology
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Journal DOI :
Korean Society of Ocean Engineers
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Volume & Issues
Volume 18, Issue 6 - Dec 2004
Volume 18, Issue 5 - Oct 2004
Volume 18, Issue 4 - Aug 2004
Volume 18, Issue 3 - Jun 2004
Volume 18, Issue 2 - Apr 2004
Volume 18, Issue 1 - Feb 2004
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Flow Survey around Two-Dimensional Circular Cylinder using PIV Technique
Journal of Ocean Engineering and Technology, volume 18, issue 3, 2004, Pages 1~7
Flaw visualization and velocity field measurement methods have practical applications in the various fluid engineering fields, such as mechanics, ships, and heat fluids. In this study, the basic principles and theoretical methods are used to establish an application technique of Particle Imae Velocimetry(abbreviated to PIV below). Accordingly, the measured results of velocity field distribution of a section inside the Circulating Water Channel (abbreviated to CWC below) are computed using the PIV is presented. The uniformity of velocity distribution of the section in CWC is confirmed, by comparing this PIV data with the existing current meter data. Also, in order to measure the flaw fields of surroundings of 2-dimensional cylinder in the CWC, the flaw visualization technique using the PIV is applied.
Drift Motion Analysis on Horizontal Plane of a Two-Point Moored Oil Tanker
Journal of Ocean Engineering and Technology, volume 18, issue 3, 2004, Pages 8~12
The anchor is laid on the seabed, and the main engine is working against incident environmental loads in a typhoon. As the main engine is broken Mum in the storm, the anchor chain is cut and the vessel drifts. Although a ship is moored by two-point mooring lines to maintain her position, it has crashed into a rock because of a typhoon, resulting in a possible accidental oil spillage. In this paper, we studied maintenance of a ship's position, which is analyzed based on the slow motion maneuvering equations considering wave, current, and wind. To estimate wave loads, the direct integration method is employed. The current forces are calculated, using MMG (Mathematical Modeling Group). Th two-point mooring forces are quasi-statistically evaluated, using the catenary equation. Th coefficients of wind forces are modeled from Isherwood's empirical data, and the variation of wind speed is estimated by wind spectrum. The nonlinear motions of a two-point moored ship are simulated, considering wave, current, and wind load, in specific domain of time.
Structural Behavior of Worn Tire Attached to Carbon Fiber Steel Pile by Wave and Current Forces
Journal of Ocean Engineering and Technology, volume 18, issue 3, 2004, Pages 13~19
The structural behavior of a worn tire, attached to carbon fiber steel pile by current and wave forces, has been investigated through the numerical method. The finite element model has been developed, by considering that the composite material of rubber and cord is orthotropic, the rubber is isotropic, and that all the material behaves as linear elastic. The pressure distribution by wave and current, around the worn tire, has been estimated through the adjustment for the concept of flow separation. Also, the structural behavior of the worn tire has been examined, by comparing the situation wherein the space between the pile is reinforced, and tire as elastic and isotropic material, with the one left empty. Through this comparison, it is determined that the space between pile and tire has to be filled with elastic and isotropic material, in order to avoid the failure by wave and current action.
Piled-Raft Foundation on Soft Clay in Gimhae Area
Journal of Ocean Engineering and Technology, volume 18, issue 3, 2004, Pages 20~25
For the structural foundation above the soft clay layer conditions, the design charts are first presented for the evaluation of both bearing capacity and total settlement in the basic raft foundation system. wad settlement relationship curves are used to evaluate the ultimate soil bearing capacity. The total settlement is evaluated by applying various traditional factors into the ultimate bearing capacity. Then, the parametric studies are carried out for the piled-raft foundation system. In the numerical analysis, the elasto-pastic finite element model(Mohr-Coulomb model) is used to present the foundation response and design charts, which enable the determination of the raft size and pile length and spacing.
CAD Interface for Block Assembly Planning using Open CASCADE
Journal of Ocean Engineering and Technology, volume 18, issue 3, 2004, Pages 26~31
This paper presents a process planning system that will generate and verify assembly sequences of block assemblies. It consists of a CAD interface system and an assembly sequence planning system. In developing this system, we used an open architecture CAD kernel for the CAD interface system, for visualizing the CAD model and the assembly sequences, and an expert system shell for the assembly sequence planning system. This paper also proposes a framework for the integration of all the steps required to automate the procedures, from design to production. The process planning system is demonstrated by a simple example.
Fundamental Study for the Development of an Optimum Hull Form
Journal of Ocean Engineering and Technology, volume 18, issue 3, 2004, Pages 32~39
A design procedure for a ship with minimum total resistance has been developed using a numerical optimization method called SQP(sequential quadratic programming) to search for different optimal hull forms. The frictional resistance has been estimated using the ITTC 1957 model-ship correlation line formula, and the wave resistance has been evaluated using a potential-flow panel method that is based on Rankine sources with nonlinear free surface boundary conditions. The geometry of a hull surface has been modified using B-spline surface patches, during the whole optimization process. The numerical analyses have been carried out for the modified Wilgey hull at three different speeds (Fn=0.25, 0.316, 0.408), and the calculation results were compared.
An Improved Method for Determining Sea Margin (I)
Journal of Ocean Engineering and Technology, volume 18, issue 3, 2004, Pages 40~43
A rational method is presented for estimating the power increase of a ship at sea. A probabilistic approach is applied to determine the weather condition at sea, A comparison is made between some full-scale data and the result of Swift's method. A comparison is also made to find differences among the results of eight kind methods for the wind added resistance of a VLCC in head wind. The mean difference between the results is 7％, in general, for a given relative wind speed.
A Study on the Hull Form Development and Resistance Performance of a High-Speed Coastal Patrol Boat
Journal of Ocean Engineering and Technology, volume 18, issue 3, 2004, Pages 44~49
Initial hull form of 10 G/T and 40 knots class coastal patrol boat is newly developed. The resistance performances are experimentally and numerically investigated by model test and CFD technique. The effect of initial trim and a fin attached at hull side are studied together. Wave patterns are observed to make clear the relation between the performance and the wave characteristics. It can be found that the initial trim plays a role in increasing the resistance performance above a certain velocity, and the CFD technique can be used at the initial design stage of a high-speed planning boats.
Development of a G/T 5,000 Class Marine Training Ship
Journal of Ocean Engineering and Technology, volume 18, issue 3, 2004, Pages 50~55
STX Shipbuilding Company is involved in the design and construction of the marine training ship of Korea Maritime University. Processing of this training ship development, model test results, and design of general arrangement results are introduced in this paper.