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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
Journal Basic Information
Journal DOI :
The Society of Naval Architects of Korea
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Volume & Issues
Volume 32, Issue 4 - Nov 1995
Volume 32, Issue 3 - Aug 1995
Volume 32, Issue 2 - May 1995
Volume 32, Issue 1 - Feb 1995
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Hull Form Definition of Underwater Vehicle using NURBS Curve
Hyun-Cheol Kim ; Seon-Sik Pyo ; Soo-Young Kim ;
Journal of the Society of Naval Architects of Korea, volume 32, issue 2, 1995, Pages 1~9
This paper suggests a numerical method that creates and varies hull form geometry of underwater vehicle. That is, it induces the cylindrical underwater vehicle from principal dimensions-total length, the length of parallel middle body, the coefficient defining entrance & run parts etc.-and represents using NURBS curve. Also, each section of hull form is varied by user interface and Sectional Area Curve is generated.
Applications of the Multiobjective Optimization Method in Main Particular Selection
Dong-Kon Lee ; Soo-Young Kim ; Soo-Chul Shin ;
Journal of the Society of Naval Architects of Korea, volume 32, issue 2, 1995, Pages 10~21
In this paper, main particulars of a ship are optimized by the multiobjective optimization method which can offer more information to designer. To analyze the effect of a ship building cost and operating cost in the optimum design of a ship, the multiobjective optimization is performed with objective functions of building and operating costs. And Required Freight Rate(RFR) is also calculated as dependent variable. The design model was developed for the Liquefied Natural Gas(LNG) carrier with longer operating distance. The LNG carrier has some characteristics such as higher speed and building cost in comparison with other commercial ships.
Numerical Computation of Near Shore Surface Flow due to Tide and Wind
J.H. Rho ; B.S. Yoon ;
Journal of the Society of Naval Architects of Korea, volume 32, issue 2, 1995, Pages 22~31
In this paper, a 3-dimensional multi-layer current simulation program is allied to real shore area near Inchon harbor with highly irregular bottom and continental geometry. The effects of bottom topography on vertical structures of the ocean tidal current is investigated through comparing the calculated results by 2-dimensional depth averaged approach and the present method. Wind induced current, which may be more dominant factor in Predicting oil spill behavior, is also simulated by the present computation algorithm. Comparison shows quite large differences not only in vertical distribution of the current but also in the direction of the surface current.
Dipole Distributions on a Hyperboloidal Panel
Chang-Sup Lee ; Jung-Chun Suh ;
Journal of the Society of Naval Architects of Korea, volume 32, issue 2, 1995, Pages 32~42
When the thickness becomes so small as in the case of the trailing edge of the propeller blade or when the curvature of the surface varies rapidly as in ship stem, the existing panel method employing a flat-surface panel, obtained by collapsing the original non-planar surface into its mean location, suffers the leakage problem and also gives inaccurate induction upon the field point very close to the panel. The hyperboloidal panel deals with the induction from the dipole distributed on the non-planar surface without approximation, overcoming the defects of the flat-surface panel. This paper introduces two distinct derivations of the formulae to compute the integral for the potential induced by a dipole of uniform density distributed on a non-planar hyperboloidal surface element. One method is based on the Gauss-Bonnet theorem and the other is based on the transformation of the surface integral into a line integral.
Computation of Turbulent Appendage-Flat Plate Juncture Flow
Sun-Young Kim ; Kazu-hiro Mori ;
Journal of the Society of Naval Architects of Korea, volume 32, issue 2, 1995, Pages 43~55
The turbulent flow around the strut mounted on the plate is studied numerically. The main objective of this paper is to validate the numerical scheme by the comparison of the computed results with the measured one, especially, to investigate the applicability of the Baldwin-Lomax(B-L) model to the juncture flow. Computations are made by solving Reynolds-averaged wavier-Stokes equation with MAC method. The computed results are compared with experimental data of Dickinson, collected in the wind tunnel at DTRC. Comparisons show good agreements generally except at the region of wake and very near the juncture. Reynolds stress model seems to be required to improve the accuracy applicable to the juncture flow in spite of the many simplification of the turbulence modelling in B-L model.
A Study on Tether Cables Used for Deep Submergence Vehicles
H. Shin ; D.S. Kim ;
Journal of the Society of Naval Architects of Korea, volume 32, issue 2, 1995, Pages 56~67
In this paper, a ship-cable-vehicle system's static configuration is shown obtained by solving cable nonlinear statics. Eigenfrequencies of the cable were calculated by the frequency domain analysis application of the linearized cable dynamic equations. Also extreme tensions in a slack-and-snapping long vertical cable were calculated by the clip-ping-off model.
Study on the Prediction Method of Ship′s Powering Performance Using the Data Bank
Eun-Chan Kim ; Kuk-Jin Kang ;
Journal of the Society of Naval Architects of Korea, volume 32, issue 2, 1995, Pages 68~74
The statistical analysis system is necessary to predict the resistance and powering performance quickly and precisely at the initial design stage. The authors propose the several functions of the performance prediction program and the structures of data bank. The program includes several series charts, regression coefficients and adapted regression analysis method based on the data bank to predict the resistance and propulsive coefficients. The calculation procedure to find out the principal dimensions and open-water efficiency of the optimum propeller is also included. The evaluation for the program and data bank is conducted by the arbitrarily selected 14 ship models. The results show good agreement with experiments within 5% mean prediction error.
Simulation of Line Heating Process by Finite Element Analysis
I.S. Nho ; J.G. Shin ; K.H. Lee ;
Journal of the Society of Naval Architects of Korea, volume 32, issue 2, 1995, Pages 75~83
As a basic research for the automation of plate forming process, the theoretical aspect of plate bending by line heating was surveyed and numerical simulation of plate bonding deformation was performed using the 3-dimensional nonlinear transient thermal elasto-plastic finite element analysis. Analyzing the unsteady heat conduction problem of the flat steel plate under heat flux input by gas torch, the time history of 3-dimensional thermal distribution was obtained. Transient thermal deformation process of the plate was analyzed under the thermal loading. And the calculated results are investigated in detail.
A Study on Wave Propagation in Drilling Boreholes at Low Frequencies
H.Y. Lee ;
Journal of the Society of Naval Architects of Korea, volume 32, issue 2, 1995, Pages 84~92
To understand how low-frequency sound waves propagate axially in drilling boreholes, the propagation modes and speeds including the effect of interaction among layers are obtained by analyzing an infinitely-long, uniform, and cylindrically multi-layered waveguide which is consisted of fluid layers and solid layers. Assuming low frequency(wave length considered is very long compared to the borehole diameter), axisymmetry, non-viscosity, and etc., analytical solutions are obtained. Also, sound reflection due to the changes in the cross section is analyzed. Results for typical drilling boreholes show the usefulness of the method developed in this research, and are compared with FEM results showing good agreements.
A Study on the Failure Characteristic of Laminated Composites Joint Containing Two Holes in Series or Parallel
Kwan-Hyung Song ;
Journal of the Society of Naval Architects of Korea, volume 32, issue 2, 1995, Pages 93~102
A series of test was performed by measuring the failure strength and the failure mode of fiber reinforced composite laminates joint containing two holes in Series or Parallel.
laminate with W/d(Side distance ratio) 4.0 and E/d(Edge distance ratio) 3.0 has the full bearing strength and are preferable in case of the good efficiency in two series hole. Comparisons were made between testing results and predicting values of the FEM model. Good agreements were fecund between them except the case of
. In the case of
since the interaction coefficients between two parallel holes and between two series holes were small, holes can be treated as independent. The Acoustic Emission(AE) and SEM method were utilized to find out the initial defects, damage and the fracture mechanism.
A Study on the Longitudinal Hull Girder Vibration of a 73,000 Deadweight Bulk Carrier
Jong-Gug Bae ; Kyoon-Yang Chung ;
Journal of the Society of Naval Architects of Korea, volume 32, issue 2, 1995, Pages 103~107
Longitudinal hull girder vibration has not been occurred severely since 1960's. However, recent low speed diesel driven ships equipped with overcritical shafting system, can be excited heavily in longitudinal direction by shaft axial farce coupled with torsional vibration. In this study the characteristics of longitudinal hull girder vibration of a 73,000 deadweight bulk carrier were investigated through onboard measurement, exciter test, and 3-D FEM analysis. Results showed that the longitudinal hullgirder vibration may occur in the ship which is not set up the barred speed range in engine operation. Moreover, this vibration occurs. only during the low speed voyage in harbour depending upon the ship loading condition.