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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 37, Issue 4 - Nov 2000
Volume 37, Issue 3 - Aug 2000
Volume 37, Issue 2 - May 2000
Volume 37, Issue 1 - Feb 2000
Selecting the target year
Experimental Investigation of Local Flow around KRISO 3600TEU Container Ship Model in Towing Tank
Suak-Ho Van ; Wu-Joan Kim ; Do-Hyun Kim ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 1~10
It is very important to understand the flow characteristics for design of the hull forms with better resistance and propulsive performance. The experimental results explicating the local flow characteristics are also invaluable for validation of the CFD codes for both inviscid and viscous flow calculations. This paper describes the techniques and equipment developed for the measurement of wave pattern on the free surface and local mean velocity fields around the stern of the modern container ship with bow and stern bulbs in KRISO towing tank. The results contained in this paper can provide the valuable information on the flow characteristics of the modern commercial hull form of small block coefficient with high speed.
Experimental Study on Local Flow Characteristics and Propulsive Performance of Two KRISO 300K VLCCs with Different Stern Shapes
Wu-Joan Kim ; Suak-Ho Van ; Do-Hyun Kim ; Chun-Ju Lee ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 11~20
The flow characteristics around the stern region of two VLCCs with the same forebody and slightly different afterbody are investigated along with propulsive performance of the ship. The local mean flow measurements and the resistance and self-propulsion tests are carried out in the towing tank for the two VLCC hull forms. The measured results clearly show the formation of bilge vortices and their effect on propulsive efficiency. The comparisons are made for the two VLCC hull forms and the relation between stern framelines and bilge vortex strength is explored. Experimental data can provide a good test case to validate the accuracy of numerical methods and turbulence model of CFD codes for ship flow calculation.
An Experimental Study on the Shallow Water Effect on Series 60 Hull Form
H.E. Kim ; S.H. Seo ; Y.G. Lee ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 21~26
For coastal service ships, the water depth is a very important parameter in the design stage of the hull form that has an influence on the restriction of the speed and draft of ships. In this study, the water depth is important for ship design. In this research, the change of total resistance, trim and sinkage due to the variation of water depth are measured by using on equipment for shallow water condition. For the basic research step about the shallow water effect, the effects on Series60(
) hull form are experimented. To compare with existing experiment results, the test conditions are same with those. The water depth conditions are 10, 15, 20, 25% of LPP of the model ship, respectively.
Numerical Experimentation of a 2-D B-Spline Higher Order Panel Method
Chung-Ho Cho ; Chang-Sup Lee ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 27~36
A higher order panel method based on B-spline representation for both the geometry and the velocity potential is developed for the solution of the flow around two-dimensional lifting bodies. Unlike Lee/Kerwin, who placed multiple control points on each panel and solved the overdetermined system of equation by the least square approach, the present method places only as many number of control points as required by the unknowns of the problem. Especially, a null pressure jump Kutta condition at the trailing edge is found to be effective in stabilizing the solution process and in predicting the correct solution. The new approach, is validated to be accurate through comparison with the analytic solution for a 2-D airfoil and to be less time-consuming due to fewer number of panels required than that used in Lee/Kerwin.
Quantitative Measurements of Complex Flow Field Around a Hydrofoil Using Particle Image Velocimetry
B.S. Hyun ; K.S. Choi ; D.H. Doh ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 37~44
An experimental study has been carried out at circulating water channel to investigate the viscous flow around breaking waves generated by a submerged hydrofoil(NACA0012). Detailed flow measurements were made at several critical points including an incipient wave-breaking point and a fully-developed wave breaker. Particle Image Velocimetry(PIV) was employed to visualize the flow field very close to the breaker as well as at the near- and far-wake of the breaker. Generation, development and decay of the wave breaker have been investigated. It is found that PIV technique could be well applied to the complex flow field, including the vortical structures near the free surface as well as the wake of the hydrofoil.
A Study on the Characteristics of Pontoon Type Floating Breakwaters in Regular Waves
D.Y. Kim ; M. Song ; Y.S. Kim ; H.J. Kim ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 45~56
An experimental and numerical investigation was made to examine the characteristics of pontoon type floating breakwaters(FBW) in regular waves. Motion responses of FBW and wave transmission coefficients are observed and compared with the results based on the linear potential theory. The linear potential theory is found to be a successful tool to investigate the characteristics of the floating breakwaters. We confirm that there exists a minimum wave transmission coefficient which is a function of wave-length/beam and beam/draft ratio. As beam/draft ratio increases the value of wave-length/beam ratio where the minimum, wave transmission coefficient occurs increases. Excessive mooring stiffness can deteriorate the performance of the floating breakwaters.
Wind Tunnel Test on the Aerodynamic Characteristics of a PARWIG Craft
H.H. Chun ; J.H. Chang ; K.J. Paik ; M.S. Shin ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 57~68
The Power Augmented Ram(PAR) effect, which blows the down stream of the propellers into the underside of the wings and hence increases the pressure between the lower surface of the wings and the sea surface, is known significantly to enhance the performance of the WIG concept by reducing the take-off and landing speeds. The aerodynamic characteristics of a 20 passenger PARWIG are investigated by wind tunnel tests with the 1/20 scale model. The efflux of the forward mounted propellers are simulated by jet flows with a blower and duct system. The lift, drag, and pitch moment of the model with various ground clearances, angles of attack and flap angles are measured for the various jet velocities, jet nozzle angles, horizontal and vertical positions of the nozzle, and the nozzle diameters. The aerodynamic characteristics of the PARWIG due to these parametric changes are compared and pertinent discussions are included. It is shown that the proper use of the PAR can increase the lift coefficient of as much as up to 4.
An Application of FSA Methodology to Hatchway Watertight Integrity of Bulk Carriers
Eun-Chang Lee ; Jae-Ohk Lee ; In-Cheol Yeo ; Young-Soon Yang ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 69~77
This study was a part of FSA study which was initiated by IMO and was applied to hatchway watertight integrity of bulk carriers. Hazards which were involved in high risk level were identified as follows. Ship Operation out of Design Criteria(Hatch Coaming Damage) and Poor Maintenance & Inspection(Securing Arrangement Damage). The potential risk was calculated by risk analysis and risk control option was made to reduce potential risk. The potential risk was about U$60,000/ship-year and could be reduced to about U$30,000/ship-year by applying RCO 1(Advanced system directly related to Hatchway Security). In addition, effectiveness of RCOs was shown by cost benefit assessment.
Quality Assessment of Hatchway Using QFD & FMEA
Seung-Min Kwon ; Young-Soon Yang ; Chan-Ho Shin ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 78~89
The quality of a product/system is getting more important concept nowadays. 'Performance', as one of the quality characteristics, means how well a product carries out its given functions and is the most adjacent characteristics to the customer satisfaction. To an engineer, however, who deals with large structures such as ships, 'Safety' is actually getting more important because of its direct relationship with failures of a product/system itself and human injuries when an accident occurs. In this study, therefore, we consider both performance and safety recognized the most important elements in dealing with structures and present a quality analysis method based on customer requirements by using QFD for performance analysis and FMEA for safety analysis respectively. Applying these methods to the hatchway of a bulk carrier, we could find 8 and 12 important parts based on performance and safety respectively. Among these, only 7 parts were pointed out commonly critical. From these, we can suggest that designers should pay more attention to these 7 parts and thus give a high priority of concerns to them when trying to improve the quality of system.
A Study on the Cutting Path Optimization using Improved Genetic Algorithm
Y.K. Han ; C.D. Jang ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 90~98
Nesting and cutting path optimization have a great effect on price competitions and improvement of productivity in various industries such as the shipbuilding, the auto, the clothing, and so on. But the theoretical approach on the development of cutting path optimization algorithm, which can be applied effectively in the shipbuilding, has not been performed enough because parts are so complex and various. In this study, a new solution has been presented to solve the cutting path problem in 2-D cutting by using improved genetic algorithm. The presented optimization algorithm can search not only the cutting sequence of parts but also the position of piercing point by applying the effective neighborhood solution generating method
Whipping analysis of hull girders considering slamming impact loads
Seong-Whan Park ; Keun-Bae Lee ; Chae-Whan Rim ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 99~109
Elastic dynamic responses analysis program for ship hulls considering slamming impact loads due to the voyage in large amplitude waves is developed. Ship hull structures are modeled by a thin-walled beam model in order to consider effects of shear deformation. The momentum slamming theory is used to derive nonlinear hydrodynamic forces considering intersection between wave particles and ship section. For the validation of the developed computer program, motions of a V-shaped simple section model and S-175 standard container model are calculated and analyzed. In each numerical example, time histories of relative displacement, velocity and vertical bending moment of a ship section are derived, considering the effect of slamming impacts in various wave conditions.ures near the free surface as well as the wake of the hydrofoil.
Numerical analysis of induction heating for the application of line heating
Jung-Gyu Kang ; Jang-Hyun Lee ; Jong-Gye Shin ;
Journal of the Society of Naval Architects of Korea, volume 37, issue 3, 2000, Pages 110~121
Gas heating, high frequency induction heating and laser heating can be used as the heat-source of line heating. Most of shipyards have been using the gas heating method for line heating. It is difficult to control the residual deformation of gas heating. High frequency induction heating is more feasible for the automation of line heating rather than the gas heating method since it is easy to control the magnitude of heat input. In this study, a numerical model of high frequency induction heating process is proposed for the application of the line heating. The simulation process of the induction heating is composed of the electromagnetic analysis, the heat transfer analysis, and the thermal deformation analysis.