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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Society of Naval Architects of Korea
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Journal DOI :
The Society of Naval Architects of Korea
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Volume & Issues
Volume 30, Issue 4 - Nov 1993
Volume 30, Issue 3 - Aug 1993
Volume 30, Issue 2 - May 1993
Volume 30, Issue 1 - Feb 1993
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Design and Construction of Long-Range High-Speed Foil Catamaran Passenger Ship
Keh-Sik Min ; Oi-Hyun Kim ;
Journal of the Society of Naval Architects of Korea, volume 30, issue 3, 1993, Pages 1~15
In response to the growing domestic request and the change of the overseas environment, Hyundai Maritime Research Institute has recently established a three-stage development plan for the high speed marine transportation system. As the first stage plan, the long-range high-speed foil catamaran passenger ship has been designed and constructed for the open-sea serivice of 800 nautical miles round trip with top speed above 40 knots. Extensive theoretical analyses and model tests were systematically carried omit along the course of design for the system optimization and the verification. In this paper, the brief summary of the design and the construction works shall be presented.
The Representation Methodology for Object-Oriented Ship Compartmentation
W.S. Kang ; S.W. Suh ; K.Y. Lee ;
Journal of the Society of Naval Architects of Korea, volume 30, issue 3, 1993, Pages 16~28
The object-oriented paradigm is being recognized as the most effective technique to develope the complex, large software system. In this paper, we propose the modeling methodology using object-oriented technology for the ship compartmentation design(OO _COMDEF) based on the proposed modeling methodology. Illustrative examples to show the application of the prototype system are given.
Numerical Computations for Hydrofoil-Generated Nonlinear Waves
Hong-Gi Lee ; Kwang-June Bai ;
Journal of the Society of Naval Architects of Korea, volume 30, issue 3, 1993, Pages 29~40
The fundamental characteristics of nonlinear free-surface waves generated by a shallowly submerged 3-dimensional hydrofoil are investigated. The fluid is assumed inviscid, incompressible and its motion irrotational. The surface tension on the free-surface is neglected. The hydrofoil is represented by a horseshoe vortex system whose shape is assumed fixed. Also the strengths of vortices are assumed given. The exact problem for the wave potential due to the horseshoe vortex system is formulated by the variational principle based on the classical Hamilton's principle. The localized finite element method is used in the numerical computations. In order to increase the numerical efficiency, an intermediate nonlinear-to-linear transition buffer subdomain for a smooth matching is introduced between the fully nonlinear computation subdomain and the truncated linear infinite subdomain. Also used is the modal analysis to reduce the computation tome drastically. The effect of inflow velocity, submergence depth of the hydrofoil and the shape of circulation distribution on the wave profiles are thoroughly examined. Especially it was possible to investigate the nonlinear influence of the free vortex on the free vortex. The nonlinear free-surface effect on the induced forces on the hydrofoil is also investigated.
A Study on Lifting Problem of Hydrofoil Using Robin Boundary Condition
I.S. Moon ; C.S. Lee ; Y.G. Kim ;
Journal of the Society of Naval Architects of Korea, volume 30, issue 3, 1993, Pages 41~50
This paper compares various potential based panel methods for the analysis of two-dimensional hydrofoil. The strength of singularity on each panel is assumed to be constant or linear. Robin boundary condition as well as Neumann and Dirichlet boundary conditions are applied to various formulations to evaluate the accuracies of the methods. Pressures and lifts are computed for various two-dimensional hydrofoil geometries and are compared with the analytic solutions. Extensive studies are performed on the local errors near the trailing edge, known to be sensitive to the foil geometry with sharp trailing edge and high camber. Robin boundary condition with the perturbation velocity potential formulation shows the best accuracy and convergence rate.
Effects of Air Compressibility on the Hydrodynamic Forces of a Bag
G.J. Lee ;
Journal of the Society of Naval Architects of Korea, volume 30, issue 3, 1993, Pages 51~61
The hydrodynamic problem when the pressurized bag submerges partially into water and oscillates was formulated by Lee(1992), and the solution method was given. In his formulation, however, the compressibility of air was neglected and the pressure inside the bag was assumed to be constant. In this paper, the formulation was done including the air compressibility and the wall to block fling around phenomenon. The compression process was assumed to be a isothermal process for a static problem, isentropic process for a dynamic problem. And the stability was analyzed for the static problem. Through the various numerical calculations, the forces and the shape of the bag were compared with those of a rigid body case, constant pressure case, and variable pressure case.
Simulation of the Vortex Shedding from a Circular Cylinder by Means of the Vortex Cloud Model
D.K. Lee ;
Journal of the Society of Naval Architects of Korea, volume 30, issue 3, 1993, Pages 62~74
The vortex shedding from a circular cylinder placed in a steady uniform stream is simulated by the vortex cloud model of the discrete vortex method. The vorticity created at the cylinder surface is discretely represented by a number of nascent vortices at each time step and the motion of these cumulative vortices is monitored to produce the evolution of the vortex distribution pattern. Convection of vortices was traced by the vortex-in-cell technique and the force coefficients were calculated by both Sarpkaya's formulae and Lee's formulae for comparison. Discussions concerning the interrelation between the computational parameters and some principles for choosing the suitable values are included.
Uncertainty Analysis for Seakeeping Model Tests
Deuk-Joon Yum ; Ho-Young Lee ; Choung-Mook Lee ;
Journal of the Society of Naval Architects of Korea, volume 30, issue 3, 1993, Pages 75~89
The present paper describes an application of UA(Uncertainty Analysis) to seakeeping model test, basically according to the Performance Test Code of ASME(American Society of Mechanical Engineers), in which all the possible error sources involved in the preparation of test, calibration of instruments, data acquisition and analysis are quantified, and summed up with error propagation coefficients to the final uncertainties. The differences between the static test such as resistance and propulsion test and the dynamic test like seakeeping test are clearly identified during all the procedures of UA and asymmetric bias errors are considered. The DRE(data reduction equation) subject to present UA are the heave and pitch response amplitude operator and nondimensionalized absolute frequency. The usefulness of UA in seakeeping test were confirmed not only for quantifying errors and improving measurement accuracy but also for the validation of various seakeeping analysis tools.
A Study on the Data Extraction and Formalization for the Generation of Structural Analysis Model from Ship Design Data
Jae-Hwan Lee ; Yong-Dae Kim ;
Journal of the Society of Naval Architects of Korea, volume 30, issue 3, 1993, Pages 90~99
As the finite element method has become a considerable and effective design tool in ship structural analysis, modeling of three dimensional finite element mesh is more necessary than before. However, the unique style and complexity of a ship usually make the modeling be hard and costly. Although most pre-processor of FEM software and geometric modeler provides modeling function, the capability is quite limited for complicated structure. In order to perform FEM modeling quickly, it is necessary to extract, rearrange, and formalize data from ship design database for partially automatic mesh generation. In this paper, the process of designing relational data tables from design data is shown as a part of analysis automation with the application of engineering database concept.
Advanced Idealized Structural Units Considering the Excessive Tension-Deformation Effects
Jeom-K. Paik ;
Journal of the Society of Naval Architects of Korea, volume 30, issue 3, 1993, Pages 100~115
In this paper, the extent of use of three kinds of the existing idealized structural units, namely the idealized beam-column unit, the idealized unstiffened plate unit and the idealized stiffened plate unit, is expanded to deal with the excessive tension-deformation effects, in which a simplified mechanical model for the stress-strain relation of steel members under tensile load is suggested. The 1/3-scale hull model for a leander class frigate under sagging moment tested by Dow is analyzed, and it is shown that the excessive tension-de-formation is a significant factor affecting the progressive collapse behavior, particularly in the post-collapse range.
Vibration Analysis of Large Structures by the Component-Mode Synthesis
B.H. Kim ; T.Y. Chung ; K.C. Kim ;
Journal of the Society of Naval Architects of Korea, volume 30, issue 3, 1993, Pages 116~126
The finite element method(FEM) has been commonly used for structural dynamic analysis. However, the direct global application of FEM to large complex structures such as ships and offshore structures requires considerable computational efforts, and remarkably more in structural dynamic optimization problems. Adoption of the component-mode synthesis method is an efficient means to overcome the above difficulty. Among three classes of the component-mode synthesis method, the free-interface mode method is recognized to have the advantages of better computational efficiency and easier implementation of substructures' experimental results, but the disadvantage of lower accuracy in analytical results. In this paper, an advanced method to improve the accuracy in the application of the free-interface mode method for the vibration analysis of large complex structures is presented. In order to compensate the truncation effect of the higher modes of substructures in the synthesis process, both residual inertia and stiffness effects are taken into account and a frequency shifting technique is introduced in the formulation of the residual compliance of substructures. The introduction of the frequency shrift ins not only excludes cumbersome manipulation of singular matrices for semi-definite substructural systems but gives more accurate results around the specified shifting frequency. Numerical examples of typical structural models including a ship-like two dimensional finite element model show that the analysis results based on the presented method are well competitive in accuracy with those obtained by the direst global FEM analysis for the frequencies which are lower than the highest one employed in the synthesis with remarkably higher computational efficiency and that the presented method is more efficient and accurate than the fixed-interface mode method.