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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 46, Issue 6 - Dec 2009
Volume 46, Issue 5 - Oct 2009
Volume 46, Issue 4 - Aug 2009
Volume 46, Issue 3 - Jun 2009
Volume 46, Issue 2 - Apr 2009
Volume 46, Issue 1 - Feb 2009
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Prediction of Maneuverability of KCS by CPMC Captive Model Test
Kim, Yeon-Gyu ; Yeo, Dong-Jin ; Kim, Sun-Young ; Yun, Kun-Hang ; Oh, Byeong-Ik ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 553~561
DOI : 10.3744/SNAK.2009.46.6.553
This paper presents the results of prediction of maneuverability of KCS by CPMC captive model test. The CPMC(Computerized Planar Motion Carriage) with captive model test equipment is installed at Ocean Engineering Tank of MOERI. KCS is the container ship which was open to the world by MOERI. And the test results for the prediction of maneuverability were presented by NMRI in Japan. The research results about the maneuverability of KCS were presented at SIMMAN 2008 Workshop in Denmark. The results of test and simulation of this paper are compared with the results of simulation by MOERI using test results of NMRI and simulation results by NMRI.
Hull Form Optimization Based on From Parameter Design
Lee, Yeon-Seung ; Choi, Young-Bok ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 562~568
DOI : 10.3744/SNAK.2009.46.6.562
Hull form generation and variation methods to be mainly discussed in this study are based on the fairness optimized B-Spline form parameter curves (FOBFC). These curves can be used both as indirect modification function for variation and as geometric entities for hull form generation. The flexibility and functionality of geometric control technique play the most important role for the success of hull form optimization. This study shows the hydrodynamic optimization process and the characteristics of optimum design hull forms of a 14,000TEU containership and 60K LPG carrier. SHIPFLOW has been used as a CFD solver and FS-Framework as a geometric modeler and optimizer.
Cavitation Test at High Reynolds Number Using a Partial Propeller Blade Model
Choi, Gil-Hwan ; Chang, Bong-Jun ; Cho, Dae-Seung ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 569~577
DOI : 10.3744/SNAK.2009.46.6.569
As the scale factor of model propellers utilized in cavitation test is about 40, it is difficult to find out practical countermeasures against the small area erosions on the blade tip region throughout model erosion tests. In this study, a partial propeller blade model was used for the observation of cavitation pattern for the eroded propeller. A partial propeller blade model was manufactured from 0.7R to tip with expanded profile and with adjustable device of angle of attack. Reynold's number of a partial propeller blade model is 7 times larger than that of a model propeller. Also, anti-singing edge and application of countermeasures to partial propeller blade model which produced in large scale can be more practical than a model propeller. For the observation of cavitation at high Reynold's number, high speed cavitation tunnel was used. To find out the most severe erosive blade position during a revolution, cavitation observation tests were carried out at 5 blade angle positions.
A Numerical Study on the Control of the Gap Flow Using a Fluid Supply Device
Seo, Dae-Won ; Oh, Jung-Keun ; Lee, Seung-Hee ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 578~586
DOI : 10.3744/SNAK.2009.46.6.578
Recently, horn-type rudders are generally being used at high speed container ships and are frequently suffering from the cavitation occurs on the rudder surface in the vicinity of the gap between the horn and rudder plate. In the present study, a fluid supplying device is employed as to decrease the gap cavitation of the horn-type rudder. The device is devised to inject the water against the pressure side through the nozzle installed inside of the gap to control the gap flow. Numerical calculations are performed to investigate the effectiveness of the device and the results show that the device can noticeably reduce the gap cavitation. The rates of water injection for achievement of the maximum retardations of gap flow are also sought.
Potential Flow Analysis for a Ship with a Flow Control Plate near the Stern
Choi, Hee-Jong ; Chun, Ho-Hwan ; Yoon, Hyun-Sik ; Lee, In-Won ; Park, Dong-Woo ; Kim, Don-Jean ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 587~594
DOI : 10.3744/SNAK.2009.46.6.587
In the paper the effect of a stern-plate attached to a ship was taken into account. The relationship between the trim angle of a ship and the wave-resistance coefficient induced by the a stern-plate was studied using the potential flow analysis method. Numerical algorithm was described using the panel method and the vortex lattice method(VLM) to simulate the flow phenomena around a ship. The non-linearity of the free surface boundary conditions were considered using the iterative method and the IGE-GMRES(Incomplete Gaussian Elimination-The Generalized Minimal RESidual) algorithm was adopted to solve the linear equation at each iterative step. Numerical calculations were carried out to investigate the validity of the adopted algorithm using KCS(KRISO 3600 TEU Container) hull. Possible cases for attachment of the plate were checked. The results showed that the numerical algorithm could be physically appropriate.
Influence Factors for the Safety Assessment on the GPE Blocks during On-shore Transportation
Kim, Sung-Chang ; Hong, Ki-Sup ; Shin, Dae-Kyun ; Yu, Byeong-Seok ; Kim, Kwan-Hong ; Suh, Yong-Seok ; Paeck, Se-Jin ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 595~602
DOI : 10.3744/SNAK.2009.46.6.595
Great number of ships has been built by Korean Shipyards since early of 2,000 due to the expanding worldwide trade. Most of shipyards have enlarged the weight of erection block and many blocks have been assembled in block fabrication factories outside the shipyards to reduce the shipbuilding period. Especially, Giga blocks that exceed 2,000 tons are often assembled by the block fabrication factories outside the shipyard. Generally, the blocks are transported to building dock in shipyard by towing barges. Accident can be occurred during the sea transportation and it may bring about not only the delay of delivery but also a disaster on the ocean environments. Transportation condition of GPE (Grand Pre-Erection) block differs from the ocean going conditions of marine vessels. Special consideration should be included before transportation work in order to guarantee the safety of GPE blocks and barge carriers. In this paper, several examples, which have been investigated to set up the safety standard of transportation of the GPE blocks on coastal routes, are introduced. For the barge transportation on coastal sea route, the design criteria are discussed, considering the design wave, the acceleration induced by wave, structural strength, and the fixture condition of blocks.
Prediction of Design Ice Load on Icebreaking Vessels under Normal Operating Conditions
Choi, Kyung-Sik ; Jeong, Seong-Yeob ; Nam, Jong-Ho ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 603~610
DOI : 10.3744/SNAK.2009.46.6.603
Ice load is one of the important design parameters for the construction of icebreaking vessels. In this paper, the design ice load prediction for the icebreaking vessels under normal operating condition in ice-covered sea is discussed. The ice loads under normal operating condition are expected from sea trials in moderate ice conditions. In this sense the extreme ice loads during heavy ramming or accidental collision are not considered. Current study describes the global ice load on the hull of the icebreaking vessels. Available ice load data from full-scale sea trials are collected and analyzed according to various ship-ice interaction parameters including displacement, stem angle, speed of a ship and flexural strength and thickness of sea ice. The ice load prediction formula is compared with the collected full-scale sea trials data and it shows a good agreement.
Fracture Estimation of Stiffened Plates under Impact Loading using Micromechanics Plasticity Model
Choung, Joon-Mo ; Cho, Sang-Rai ; Kim, Kyung-Su ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 611~621
DOI : 10.3744/SNAK.2009.46.6.611
This paper first reviews the physical meanings and the expressions of two representative strain rate models: CSM (Cowper-Symonds Model) and JCM (Johnson-Cook Model). Since it is known that the CSM and the JCM are suitable for low-intermediate and intermediate-high rate ranges, many studies regarding marine accidents such as ship collision/grounding and explosion in FPSO have employed the CSM. A formula to predict the material constant of the CSM is introduced from literature survey. Numerical simulations with two different material constitutive equations, classical metal plasticity model based on von Mises yield function and micromechanical porous plasticity model based on Gurson yield function, have been carried out for the stiffened plates under impact loading. Simulation results coincide with experimental results better when using the porous plasticity model.
Overlap-Avoidance Algorithm for Automation of Drawing Generation
Ruy, Won-Sun ; Yang, Young-Soon ; Yun, Yeon-Suk ; Ko, Dae-Eun ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 622~630
DOI : 10.3744/SNAK.2009.46.6.622
This paper deals with the automation techniques of ship assembly drawing generation, which help the designer to reduce the man-hour for completing the drawings, and improve the quality of the drawing for the given time. The automation techniques are necessary for the reasons of economical efficiency and improve communication between the designers and shop-makers. The overlap-avoidance algorithm of this paper maximizes the readability of the drawings using the optimization techniques and the heuristic rules, especially for the ship assembly field.
Conceptual Design of Crew Support System Based on Wireless Sensor Network and Power Line Communication for Cruise Ship
Kang, Hee-Jin ; Lee, Dong-Kon ; Park, Beom-Jin ; Paik, Bu-Geun ; Cho, Seong-Rak ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 631~640
DOI : 10.3744/SNAK.2009.46.6.631
The highest priority of the cruise trip is the safety and comfort of its passengers. Though the cruise lines take every appropriate measure to ensure that their Passengers are safe and experience enjoyable vacations it is hard to fulfill all passenger's personnel requirement with limited number of crews. Generally, each passenger is issued an identification card which contains their digital photo and personal identification information on a magnetic strip that he or she must present when entering or leaving the ship. This technology allows the ship to know which Passengers and crew members are on board and which are not. However, this system has some limitations of functions and usage. To support each passenger as his or her personal liking, additional number of crews or some kind of new system is needed. In this paper, the crew support system based on sensor network using wireless and wired communication technologies was studied. To design the system, PLC(Power Line Communication) system and ZigBee based passenger location recognition, classification system has studied experimentally. By using this system, crews can serve passengers more closely and personally with less effort.
The Simulation System for Scheduling Validation of the Panel Block Shop
Lee, Phi-Lippe ; Oh, Dae-Kyun ; Lee, Kwang-Kook ; Shin, Jong-Gye ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 641~649
DOI : 10.3744/SNAK.2009.46.6.641
There were many simulation models that made for validation of industrial environment and estimate of efficiency to be constructed. And there will be more simulation models made for same reason, too. Already, there have been a lot of simulation models in industry field and scholar labs. To reuse these simulation models, it is necessary to find common properties and make the high abstract simulation model. Based on this idea, this study shows to define the high abstract simulation model to be able to specialize in need and to make the software framework for connecting the specific simulation model to the abstract model. And it is held up as the example that applying the simulation framework to the Ship Panel Block shop simulation model.
Numerical Simulation of Two-dimensional Sloshing Phenomena Using Marker-density Method
Lee, Young-Gill ; Jeong, Kwang-Leol ; Lee, Seung-Hee ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 650~658
DOI : 10.3744/SNAK.2009.46.6.650
Two dimensional sloshing phenomena in regularly excited liquid cargo tank are numerically simulated with finite difference method. Navier-Stokes equations and continuity equation are computed for this study. The free-surface is determined every time step satisfying kinematic boundary condition using marker-density method. And the exciting force is treated by adding the acceleration of the tank to source term. The results are compared with other existing experiment results. And the comparison results show a good agreement. The sloshing phenomena in the tank of the 138K LNG carrier in sway motion is simulated with present calculation methods in low filling level. To find the relations between impact pressure and excitation condition, the calculations are performed in various amplitudes and periods. The averaged maximum pressures are compared each other.
Dynamic Analysis of Floating Bodies Considering Multi-body Interaction Effect
Kim, Young-Bok ; Kim, Moo-Hyun ; Kim, Yong-Yook ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 659~666
DOI : 10.3744/SNAK.2009.46.6.659
Recently, there are several problems in space, contiguity and facility of the existing harbors issued due to the trend of enlarging the container capacity of the large container vessel, the Mobile Harbor has been proposed conceptually as an effective solution for those problems. This concept is a kind of transfer loader of the containers from the large container ship, which is a floating barge with a catamaran type in the underwater part, and so prompt maneuverability and work effectiveness. For the safe mooring of two floating bodies, a container and the mobile harbor, in the near sea apart from the quay, a robot arm mooring facility specially devised would be designed and verified through comparison study under various environmental sea condition in the inner and outer harbor. DP system (Dynamic Positioning System) using the azimuth thruster and a pneumatic fender, etc, will be considered as a next research topic for the mooring security of multi-body floaters.
Production & Performance Assessment of Composite Material Flexible Propeller
Lee, Sang-Gab ; Byun, Joon-Hyung ; Paik, Bu-Geun ; Hyun, Beom-Soo ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 667~674
DOI : 10.3744/SNAK.2009.46.6.667
The researches on the development of composite material underwater vehicle propeller have been actively attempted for the reduction of radiation noise with outstanding damping effects. Composite material propellers have almost been designed and produced by the foreign experts, and it is difficult to obtain the related informations about their flow, vibration, material characteristics because they are treated as the secrets with close relationship to the military technology, especially in the case of underwater vehicles. For the security of domestic manufacture of composite material propeller and the comparison and examination of its performance and radiation noise characteristics with those of German CONTUR composite material propeller, two propellers were self-produced according to the fiber weaving and array using compressible molding process and their self performances and radiation noise characteristics were measured. The mean fluctuations of blade tip of self-produced composite material propeller were increased and the radiation noises in the low frequency band were reduced compared to those of CONTUR, which could be estimated as the change of material characteristics and also be thought to be used for the future research informations.
An Algorithm of Curved Hull Plates Classification for the Curved Hull Plates Forming Process
Noh, Ja-Ckyou ; Shin, Jong-Gye ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 675~687
DOI : 10.3744/SNAK.2009.46.6.675
In general, the forming process of the curved hull plates consists of sub tasks, such as roll bending, line heating, and triangle heating. In order to complement the automated curved hull forming system, it is necessary to develop an algorithm to classify the curved hull plates of a ship into standard shapes with respect to the techniques of forming task, such as the roll bending, the line heating, and the triangle heating. In this paper, the curved hull plates are classified by four standard shapes and the combination of them, or saddle, convex, flat, cylindrical shape, and the combination of them, that are related to the forming tasks necessary to form the shapes. In preprocessing, the Gaussian curvature and the mean curvature at the mid-point of a mesh of modeling surface by Coon's patch are calculated. Then the nearest neighbor method to classify the input plate type is applied. Tests to verify the developed algorithm with sample plates of a real ship data have been performed.
Free Surface Suction Force Acting on a Submerged Slender Body Moving Beneath a Free Surface
Yoon, Bum-Sang ; Trung, Dam Vam ;
Journal of the Society of Naval Architects of Korea, volume 46, issue 6, 2009, Pages 688~698
DOI : 10.3744/SNAK.2009.46.6.688
In this paper, the steady lift force acting on a slender body moving beneath regular wave systems of arbitrary wavelengths and directions of propagation is considered. The momentum conservation theorem and the strip method are used to obtain the hydrodynamic forces acting on the body and affecting its motions on the assumption that the body is slender. In order to obtain the vertical steady force acting on it, or the free surface suction force, the second-order hydrodynamic forces caused by mutual interactions between the components of the first-order hydrodynamic forces are averaged over time. The validity of the method is tested by comparison of the calculated results with experimental data and found to be satisfactory. Through some parametric calculations performed for a typical model, some useful results are obtained as to the depth of submergence of the body, wavelengths, directions, etc.