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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 47, Issue 6 - Dec 2010
Volume 47, Issue 5 - Oct 2010
Volume 47, Issue 4 - Aug 2010
Volume 47, Issue 3 - Jun 2010
Volume 47, Issue 2 - Apr 2010
Volume 47, Issue 1 - Feb 2010
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A Study on the Sail Force Prediction Method for Hull Hydrodynamic Force Measurement of 30feet Catamaran Sailing Yacht
Jang, Ho-Yun ; Park, Chung-Hwan ; Kim, Hyen-Woo ; Lee, Byung-Sung ; Lee, In-Won ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 477~486
DOI : 10.3744/SNAK.2010.47.4.477
During sailing by wind-driven thrust on the sail, a catamaran sailing yacht generates leeway and heeling. For predicting sail force, a model test was carried out according to running attitude. Through the model test, drag and side force of the real ship was predicted. A purpose of this study is to find sail force to C.E from changed attitude during running direction. By balance of hull and sail, a heeling force of designed sail is predicted. Also through heeling force and driving force, total sail force and direction from C.E are considered with changed mast including leeway and heeling.
A Study on a Characteristic of the Three Friction Resistance Lines
Park, Dong-Woo ; Kang, Seon-Hyung ; Chun, Ho-Hwan ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 484~495
DOI : 10.3744/SNAK.2010.47.4.484
The speed-power prediction is one of the most important functions of towing-tank facilities. Generally, ITTC-1978 extrapolation method is employed for the full-scale powering prediction. During the procedure, the friction resistance line plays a major role to predict both model- and full-scale resistance. In this paper, the form factors determined by ITTC-1957 line for several kinds of vessels are compared with the values obtained using the lines proposed by Grigson(1993) and Katsui et al.(2005). Resistance and self-propulsion coefficients predicted by three different friction resistance lines are minutely analyzed. Finally, brake powers and revolutions estimated by flat plate friction resistance lines of Grigson and Katsui et al. are compared with the results obtained from ITTC-1957 line.
An Experimental Study on the Vertical Motion of a High-Speed Planing Craft in Regular Following Waves
Kim, Dong-Jin ; Rhee, Key-Pyo ; You, Young-Jun ; Park, Han-Sol ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 496~507
DOI : 10.3744/SNAK.2010.47.4.496
It is well known that when a high-speed planing craft travels in following seas it experiences long-periodic motions due to low encounter frequency, and it often loses its course keeping stability. Therefore, it is necessary to study the sea-keeping performance and stability of it in the following seas. In this paper, the vertical motions of a planing craft were measured in following regular waves, and the test results were compared with the theoretical results. In the case of the same encounter frequency, non-dimensionalized motion amplitudes become larger as Froude number is higher, and non-dimensionalized motion amplitudes in head waves are larger than those in following waves. The mean values of the motions in following waves are similar to the running attitudes of a craft in calm water at the same Froude number.
Effect of Chamfering Top Corners on Liquid Sloshing in the Three-dimensional Rectangular Tank
Jung, Jae-Hwan ; Lee, Chang-Yeol ; Yoon, Hyun-Sik ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 508~516
DOI : 10.3744/SNAK.2010.47.4.508
This study aims at investigating the effect of the chamfer on the liquid sloshing in the three-dimensional (3D) rectangular tank. In order to simulate the 3D incompressible viscous two-phase flow in the 3D tank with partially filled liquid, the present study has adopted the volume of fluid (VOF) method based on the finitevolume method which has been well verified by comparing with the results of the relevant previous researches. The effects of the chamfering top corners of the tank on the liquid sloshing characteristics have been investigated. The angle of the chamfering top corners (
) has been changed in the range of
Numerical Simulation of Turbulent Wake Behind SUBOFF Model
Nah, Young-In ; Bang, Hyung-Do ; Park, Jong-Chun ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 517~524
DOI : 10.3744/SNAK.2010.47.4.517
This paper covers the numerical studies performed to investigate the characteristics of turbulent wake generated by a submarine, SUBOFF model. A SUBOFF model assumed as an axial-symmetric body was used to generate wake. The numerical simulation was performed by using a commercial S/W, FLUENT, with the same condition as the experiments by Shin et al.(2009). Mainly the cross-sectional distribution of the time-averaged mean wake and turbulent kinetic energy was compared with the experiments. Both results are agreed well with each other in the propeller wake section, but the agreement between both is not so satisfied in the far wake field. It means that more numerous number of grid points and their concentration should be required in that field.
Numerical Simulation of Two-dimensional Nonlinear Waves on Beaches Using a Smoothed Particle Hydrodynamics Method
Kim, Cheol-Ho ; Lee, Young-Gill ; Jeong, Kwang-Leol ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 525~532
DOI : 10.3744/SNAK.2010.47.4.525
In this paper, wave breakers which occur in two dimensional coasts are simulated using a SPH(Smoothed Particle Hydrodynamics) method which represents the movement of fluidic physical volume with particles. As continuative fluid is approximated to the particles, the simulations are performed using fully Lagrangian method without any grid system. Two-dimensional Navier-Stokes equations and continuity equation are used for the numerical simulations. To generate incident waves, a piston type wavemaker is employed. The accuracy of the wave which is numerically generated by the wavemaker is verified by comparing with analytical results. The computations are carried out with various wave heights and slopes. The wave patterns generated through the numerical simulations are compared with several existing experimental and computational results. Agreement between the experimental data and the computation results is comparatively good. Also, the breaker depth index and the breaker height index from the present calculations are compared with the existing experimental results, and the tendency is very similar.
A Study on the High Lifting Device Equipped with the Trailing Edge Rotor for the Enhancement of Circulation Control
Oh, Jung-Keun ; Kim, Hyo-Chul ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 533~542
DOI : 10.3744/SNAK.2010.47.4.533
For a long times it has been believed that the Magnus effect of the rotating cylinder could be utilized for the lifting devices applicable to marine practices. It has been reported that the rotating cylinder installed on upper deck of commercial vessel could play a energy saving role however the idea might be applicable in a very rare case in ship building practices. In this study special high lift rudder system equipped with the trailing edge rotor has been suggested in correspondence with the increasing requirement of greater rudder force. Through the numerical simulation it is cleared that the trailing edge rotor could play a role in enhancement of circulation and refinement of boundary layer of the rudder system. At the same time it is found out that the lift force of the rudder system without rotation of trailing edge rotor could be doubled when the circumferential velocity of the trailing edge rotor is equal to twice of the inflow velocity.
A Study for Improvement of Lift Performance of a Horn-type Rudder with the Coanda Effect
Seo, Dae-Won ; Oh, Jung-Keun ; Lee, Seung-Hee ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 543~552
DOI : 10.3744/SNAK.2010.47.4.543
The Coanda effect is noticeable when a jet stream is applied tangential to a curved surface since then the jet stream remains attached to the surface beyond the point where flow separates otherwise and results in augmentation of circulation and lift. Numerous experimental and numerical studies have been performed in various fields of aerodynamics to exploit the Coanda effect and many of them found to be useful. It can be speculated that the Coanda effect may have practical application to the field of marine hydrodynamics as well since various control surfaces are being used to control behaviors of ships and offshore structures. In the present study, the Coanda effect has been applied to a horn type rudder and a series of numerical computations and model experiments are performed to find the practical applicability. The results indicate that the Coanda jet increases the lift coefficient of the rudder as much as 52% at the momentum coefficient
A Study on the Rudder Shapes for the Suppression of Cavitation around a Horn-type Rudder
Pak, Kyung-Ryeong ; Lee, Young-Gill ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 553~564
DOI : 10.3744/SNAK.2010.47.4.553
This paper studies on the rudder shapes for the suppression of the cavitation around a horn-type rudder. To improve the problems due to cavitation, there have been several studies. However, these some studies are recognized as incomplete ways to suppress the rudder cavitation. In this study, the section shapes to suppress the cavitation phenomena are determined by moving the location of maximum thickness for reducing the curvature variation and changing the radius of leading edge. Also, in the pintle part, the curvature radius of the inlet outlet edge of rudder plate is changed. During the design of rudder shape, two-dimensional numerical simulations are firstly performed because those offer some advantages with that cavitation phenomena becomes predictable for a short time, and then the three-dimensional numerical simulations are performed to confirm the determination. The time mean distribution of the propeller slipstream is imposed on the inlet boundary condition. As some results, this paper shows the effects reducing the range of the occurrence of cavitation, and suggests the references on the design of a horn-type rudder for the suppression of cavitation phenomena.
A Comparative Study on the Crack Propagation Characteristics According to the Pre-Notch Shapes of Fatigue Indicator Sensor
Kim, Jae-Hyun ; Kim, Seul-Ki ; Cho, Young-Gun ; Yeo, Seung-Hoon ; Kim, Kyung-Su ; Kim, Sung-Chan ; Lee, Jang-Hyun ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 565~572
DOI : 10.3744/SNAK.2010.47.4.565
It is difficult to predict the accurate fatigue life of the ship structure because of load uncertainty and load redistribution at the ship structure members. As one of studies for accurate evaluation and prediction of fatigue life, it is a promising way to detect the crack previously by attaching the Fatigue Indicator Sensor (FIS) at the crack prediction region. In order to predict the fatigue life of the ship structure by using FIS, it is required to know previously the crack propagation characteristics according to pre-notch shapes. In this study, we obtained the stress distribution phase, stress concentration factors and stress intensity factor of various pre-notch shapes through FEA. Additionally, we conducted the fatigue test and obtained the characteristics of crack propagation according to the pre-notch shapes through comparison between the fatigue test and the FEA. Consequently, we classified the pre-notch shape into 3 categories: Long, Medium, and Short life type. On the basis of the numerical and experimental results, the FIS can be developed.
A Comparative Study of the Fatigue Strength on Cruciform Joints by Local Stress Methods
Yang, Park-Dal-Chi ; Ahn, Jung-Hyun ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 573~579
DOI : 10.3744/SNAK.2010.47.4.573
The notch effects on the fatigue strength of welded joints are both stress concentration and fatigue strength reduction. In the notch stress approach, the notch effects are usually approximated by introducing weld-bead parameters for the local detailed weld joints. In this paper, well-known notch stress approaches - critical distance method, area method and fictitious rounding method are presented for the fatigue strength of cruciform joints. The estimated results of the present methods are applied to the experiments performed in this study and reported in the references. The results of the application show that the fatigue-life scatterness of the experimental data expressed in the nominal stress is significantly reduced by introducing the effective fatigue stress of the present study.
A Study on Out-of-Plane Bending Mechanism of Mooring Chains for Floating Offshore Plants
Lim, Yu-Chang ; Kim, Kyung-Su ; Choung, Joon-Mo ; Kang, Chan-Hoe ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 580~588
DOI : 10.3744/SNAK.2010.47.4.580
OPB(out-of-plane bending)-induced failure of mooring chain was firstly addressed by CALM (catenary anchor leg mooring)-type offloading buoy, located approximately one mile away from the bow of the Girassol FPSO which was installed offshore area of Angola in September 2001. This study deals with verifying the load transfer mechanism between the first free chain link and connected two chain links inside the chain hawse. OPB moment to angle variation relationships are proposed by extensive parametric study where the used design variables are static friction coefficients, proof test loads, nominal tension forces, chain link diameters, chain link grades and chain link types. The stress ranges due to OPB moments are obtained using nonlinear FEAs (finite element analyses). Final stress ranges are derived considering ones from IPT (in-plane tension) forces. Also a formula for OPB fatigue assessment is briefly introduced.
Study of the Indoor Noise Limit for Naval Vessels Considering the Satisfaction of the Crew
Han, Hyung-Suk ; Park, Mi-Yoo ; Cho, Heung-Gi ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 589~597
DOI : 10.3744/SNAK.2010.47.4.589
The indoor noise of the naval vessel is very important considering hearing protection, improvement of working environment and easily communication between crews. When the environment of the naval vessel suffering from the noise is considered, it is very important to be quiet in the living area where the crews have a rest sufficiently. In addition, the noise of the working area should be reduced in order to increase working efficiency. Therefore, in this research, the satisfactions about the indoor noise are survey for crews working in a naval vessel. Through this survey, the relationship between the indoor noise and crew`s satisfaction about it can be found. As a result, the limit of sound pressure level which almost all crew can be satisfied with the indoor noise about their living and working area is suggested base on the survey in this research.
The Structural Design of a Large Oil Tanker based on the CSR by Considering the Web Arrangement and Material Property
Na, Seung-Soo ; Yum, Jae-Seon ; Kim, Yoon-Sung ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 598~605
DOI : 10.3744/SNAK.2010.47.4.598
The structural design of oil tankers and bulk carriers should be performed based on the Common Structural Rules(CSR) which were recently established by the International Association Classification Societies(IACS). At first, in the structural design viewpoint, the scantling and hullweight based on the CSR should be compared with those of existing rules, and then a minimum weight/cost design should be performed by considering the variation of the number of web and the material property. In this study, the optimum web space and material property will be proposed by performing a minimum weight/cost design of a large oil tanker, and the results will be compared with those of existing ship. The longitudinal members are determined by SeaTrust-Holdan developed by the Korean Register of Shipping(KR), and the transverse members are determined by NASTRAN and PULS.
Plug Manufacturing of Leisure Boats through the NC Processing
Park, Gen-Ong ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 606~612
DOI : 10.3744/SNAK.2010.47.4.606
This study took advantage of NC processing technique in order to recreate design in development process of leisure boat based on the Korean boats and ships. CNC milling is an area which is concerned in automation process of boat production and needs sophisticated software, equipment and professionals to pilot it. The progress of manufacture begins when the surface model creation and simulation being done using CAD/CAM software. In this process, the needs such as 3D design, NC processing data, plug lamination and partition processing appear as detailed steps. The study completed these detailed steps and also the application example has been studied with presenting engineering potentialities.
A Method for the Construction of ISO 15926-based Library for Equipment and Materials for the Exchange of Ship Outfitting Design Data
Mun, Du-Hwan ; Jinggao, Li ; Han, Soon-Hung ; Lee, Won-Joon ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 613~627
DOI : 10.3744/SNAK.2010.47.4.613
Ships and off-shore plants have very long lifecycles. Design data of ships and off-shore plants are used as master data in the subsequent phases after the design phase. Therefore, it is an important issue how to convert native design data generated from commercial shipbuilding CAD systems into neutral data with the use of international industrial data standards. International standard-based exchange of ship outfitting and off-shore plant data needs the construction of a library for specifications data of equipment and materials and the provision of external referencing mechanism for retrieving data stored in the library. This paper proposes an approach to construct a specifications data library with the use of ISO 15926 process plants. This library is used for providing specifications data through external referencing when translating ship outfitting data from TRIBON system into ISO 10303 STEP AP 227-formed data.
The DEVS-based Detailed Implementation Method of the Command and Fire Control System for the Underwater Vehicle DEVS-HLA Simulation in the Engagement Level
Son, Myeong-Jo ; Cha, Ju-Hwan ; Kim, Tae-Wan ; Lee, Kyu-Yeul ; Nah, Young-In ;
Journal of the Society of Naval Architects of Korea, volume 47, issue 4, 2010, Pages 628~645
DOI : 10.3744/SNAK.2010.47.4.628
To perform the engagement level simulation between the underwater vehicle model and the surface model those are constituted with various systems/ sub-systems, we implemented four different federates as a federation according to the IEEE 1516 HLA (High Level Architecture) protocol that is the international standard in the distributed simulation. Those are CFCS (Command and Fire Control System) federate, motion federate, external entities (torpedos, countermeasure and surfaceship) federate, and visualization federate that interacts with OSG (Open Scene Graph)-based visualization rendering module. In this paper, we present the detailed method about the model constitution for discrete event simulation in the distributed environment. For the sake of this purpose, we introduce the DEVS (Discrete Event System Specification)-HLA-based modeling method of the CFCS federate that reflects not only the interations between models, but also commands from user and tactics manager that is separated from the model. The CFCS federate makes decisions in various missions such as the normal diving, the barrier misision, the target motion analysis, the torpedo launch, and the torpedo evasion. In the perspective of DEVS modeling, the CFCS federate is the coupled model that has the tactical data process model, command model and fire control model as an atomic model. The message passing and time synchronization with other three federates are settled by the
RTI (Runtime Infrastructure) that supports IEEE 1516. In this paper, we provides the detailed modeling method of the complicated model that has hierarchical relationship such as the CFCS system in the submarine and that satisfies both of DEVS modeling method for the discrete event simulation and HLA modeling method for the distributed simulation.