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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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The Society of Naval Architects of Korea
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Volume & Issues
Volume 41, Issue 6 - Dec 2004
Volume 41, Issue 5 - Oct 2004
Volume 41, Issue 4 - Aug 2004
Volume 41, Issue 3 - Jun 2004
Volume 41, Issue 2 - Apr 2004
Volume 41, Issue 1 - Feb 2004
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A Study on the Resistance Characteristics of High-Speed Ship in Shallow Water Condition
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 1~11
DOI : 10.3744/SNAK.2004.41.2.001
In this paper, the resistance characteristics of high-speed ship are studied in the region of shallow water condition. For the purpose of this research, model tests in a ship model basin are carried out with an equipment for the satisfaction of shallow water condition, and the computions of wave resistance characteristics and the flow simulations around a ship hull are performed by Michell`s thin ship theory and a finite difference method based on MAC scheme, respectively. The calculation results for the resistance and flow characteristics of a ship hull are compared with those from the model tests in deep and shallow water conditions. From the comparison results, it is known that the variation of wave pattern around a ship hull caused by shallow water condition has the most influence to the resistance characteristics of a high-speed ship advancing on shallow water.
Analysis of the Super-Cavitating Flow Around 2-Dimensional Hydrofoil
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 12~20
DOI : 10.3744/SNAK.2004.41.2.012
In this study, a linearized super-cavitation theory was applied in order to analyse the performance of the 2-dimensional foils. For flat plate with non-thickness, the numerical results correlated very well with Nishiyama`s theoretical results for closed cavitation model. For plano-convex section, the numerical results correlated very well with Wade`s experimental data. The new lifting surface procedure, developed and validated in this study, is generally considered applicable to the performance analyses of the super-cavitating propeller and trans-cavitating propeller.
Numerical Analysis of Underwater Propeller Noise(Part 1. Non-Cavitating Noise)
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 21~32
DOI : 10.3744/SNAK.2004.41.2.021
The non-cavitating noise of underwater propeller is considered numerically in this study. The main purpose is to analyze non-cavitating noise from underwater propellers in various operating conditions with different configurations. Noise is predicted by using time-domain acoustic analogy, boundary element method, and computational hydro-acoustics. The flow field is analyzed with potential-based panel method, and then time-dependant pressure data are used as the input for Focus Williams-Hawkings formulation to predict far field acoustics. Furthermore, boundary element method and computational hydro-acoustics are also considered to investigate duct propeller and ducted multi-stage propeller to consider the reflection and diffraction of sound waves. With this methodology, noise intensity and directivity of each noise sources could be well analyzed.
Numerical Analysis of Underwater Propeller Noise(Part 2 Cavitating Noise)
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 33~46
DOI : 10.3744/SNAK.2004.41.2.033
The cavitating noise of underwater propeller is considered numerically in this study. The main purpose of this research is to analyze these noise sources from marine propeller. The approach for investigation is a potential based panel method coupled with acoustic analogy. To predict propeller sheet cavitation noise, the blade surface cavity is considered as a single valued pulsating volume of vapor attached to the blade surface. The time dependent cavity volume data are used for noise prediction. Furthermore, we analyze hydrofoil cavitation bubble behavior and noise using Eulerian/Lagrangian approach. Through this study, we can analyze dominant noise source of marine propeller and provide a basis for proper noise control strategies.
Exact Solution on the Vertical Hydro-elastic Responses of Ships having Uniform Sectional Properties
Park, In-Kyu ; Jung, Jong-Jin ; A. Korobkin ;
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 47~54
DOI : 10.3744/SNAK.2004.41.2.047
Exact solution on the vertical responses of ships having uniform sectional properties in waves is derived. Boundary value problem consisted of Timoshenko beam equation and free-free end condition is solved analytically. The responses are assumed as linear and wave loads are calculated by using strip method. Vertical bending moment, shear force and deflection are calculated. The developed analysis model is used for the benchmark test of the numerical codes in this problem. Also the application on the preliminary design of barge-like ships and VLFS (Very Large Floating Structure) is expected.
On the Springing Response of Ships with Shallow Draft and Large Breadth
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 55~60
DOI : 10.3744/SNAK.2004.41.2.055
This paper describes the estimation method of hull girder response of ships due to springing. To this aim, nonlinear springing effect on the hull girder is evaluated including vertical, horizontal, and torsional deformation of the hull. The Timoshenko beam model is used to calculate the stress distribution on the hull girder. The quadratic strip method is employed to calculate the hydrodynamic forces and moments on the hull. In order to remove the irregular frequencies, `rigid lid`is adopted on the hull free surface level and hydrodynamic coefficients are interpolated for asymptotic values. The results of example calculation show a reasonable agreement with previous results for both symmetric and anti-symmetric responses.
A Numerical Study of Hydrodynamic Forces Acting on Rudders
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 61~69
DOI : 10.3744/SNAK.2004.41.2.061
In this study, flow around rudder is analyzed by utilizing the numerical calculation, and the rudder open water test is performed to validate the calculation. The aim of this study is to design the new rudder shape to improve manoeuvring performance. In first, flow around two-dimensional rudder section is analyzed to understand the characteristics of section profile. And the calculation for all-movable rudders is performed and compared with results of rudder open water test. It is hard to numerically predict the drag force because the value is sensitive to the turbulence modeling and grid spacing near the wall. However, the lift force is predicted well. And we can prove that concave profile of the rudder section produce more lift and torque than convex one as a experiment. However PANEL method that ignore viscous effect cannot distinguish the difference of them. So, we can look for the numerical tool to be developed the new rudder shape.
Flow Control and Drag Reduction of a Circular Cylinder by an External Magnetic Field
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 70~78
DOI : 10.3744/SNAK.2004.41.2.070
The present study numerically investigates two-dimensional laminar flow past a circular cylinder in an aligned magnetic field using the spectral method. Numerical simulations are performed for flow fields with Re
Analysis of Resistance Performance of Modern Commercial Ship Hull Form using a Level-Set Method
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 79~89
DOI : 10.3744/SNAK.2004.41.2.079
The viscous free surface flow around KRISO container ship (KCS) is computed using the finite volume based multi block RANS code, WAVIS developed at KRISO. The free surface is captured with the Level-Set method and the realizable k-
model is employed for turbulence closure. The computations are carried out at model scale. For accurate free surface solution and its stable convergence the computations are performed with a suitable grid refinement around the free surface by applying an implicit discretization method based on a finite volume method to the Level-Set formulation. In all computational cases the numerical results agree well with experimental measurements.
A Numerical Simulation based on Cell-centered Scheme for Contractive and Dilative Motion on Axisymmetric Micro-hydro machine
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 90~97
DOI : 10.3744/SNAK.2004.41.2.090
Flow mechanism of contractive and dilative motion is numerically investigated to obtain a propulsive force in highly viscous fluid. An axisymmetric code is developed with unstructured grid system based on cell-centered scheme. It is validated by comparing with the results of Stokes approximation for the problem of uniform flow past a sphere in low Reynolds number(R
Lifting Analysis for Ship Hull Blocks using 4 Cranes
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 98~105
DOI : 10.3744/SNAK.2004.41.2.098
This study focuses on an analytical approach to calculate four crane lifting forces for heavy ship hull blocks considering elongations of lilting slings. Four-crane-lifting is a redundant problem. During lifting procedures, in addition to the force and moment equilibrium equations, a compatibility condition is introduced to determine 4 unknown lifting forces. For verification of the method, a ship hull block with field measurements data is analyzed and the result shows that the information obtained by current method could be useful to engineers to conduct lifting work at shipyards.
Development of Simple Prediction Model for V-groove butt welding deformation
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 106~113
DOI : 10.3744/SNAK.2004.41.2.106
The block assembly of ship consists of a certain type of heat processes such as cutting, bending, welding, residual stress relaxation and fairing. The residual deformation due to welding is inevitable at each assembly stage. The geometric inaccuracy caused by the welding deformation tends to preclude the introduction of automation and mechanization and needs the additional man-hours for the adjusting work at the following assembly stage. To overcome this problem, a distortion control method should be applied. For this purpose, it is necessary to develop an accurate prediction method which can explicitly account for the influence of various factors on the welding deformation. Systematic and quantitative theoretical works to clarify the effects of various factors on the welding deformation have rarely been found. Therefore, in this paper, the effects of various factors, such as welding process and gravity on the butt welding deformation have been investigated through a number of numerical analyses. In addition, this paper proposes a simplified analysis method to predict the butt welding deformation in actual plate structure. For this purpose, a simple prediction model for butt welding deformations has been derived based on numerical and experimental results through the regression analysis. Based on these results, the simplified analysis method has been applied to some examples to show its validity.
A Dynamic Structural Analysis System for Propeller Blades
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 114~120
DOI : 10.3744/SNAK.2004.41.2.114
Propeller blades have complex airfoil section type geometry and the thickness is continuously varied to both its length and cord-wise direction. in the present research, the finite element analysis program PROSTEC (Propeller Stress Evaluation Code) is developed to calculate the structural responses of propeller blades in irregular ship wake field. To represent the curved and skewed geometry of propeller blades accurately, 20-node curved solid element using the quadratic shape function is adopted. Input data for the analysis including the geometry and pressure distribution of propeller blades can be generated automatically from the propeller design program. And to visualize the results of analysis on windows system conveniently, the post processor PROSTEC-POST is developed.
Design of Technical Information System for Naval Engineering
Journal of the Society of Naval Architects of Korea, volume 41, issue 2, 2004, Pages 121~127
DOI : 10.3744/SNAK.2004.41.2.121
The objective of this study is to design the technical information system for naval engineering (named TISNE). As the basic concept of the system, CALS (Continuous Acquisition and Life-cycle Support) and KMS(Knowledge Management System) were considered for the management and sharing of standardized digital information throughout the life-cycle of naval ship. To define the system components and their functionalities, the processes of naval ship design and construction were reviewed. Also web-based system prototype and the graphical user interlaces were designed and implemented.