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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 51, Issue 6 - Dec 2014
Volume 51, Issue 5 - Oct 2014
Volume 51, Issue 4 - Aug 2014
Volume 51, Issue 3 - Jun 2014
Volume 51, Issue 2 - Apr 2014
Volume 51, Issue 1 - Feb 2014
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A Study on Economic Analysis of LNG Fuel Propulsion Ships using Life Cycle Cost(LCC) Based on Combined Interest Rates and Sensitivity Analysis
Hong, Jin Pyo ; Kim, Su Yeong ; Kim, Chwa Jin ;
Journal of the Society of Naval Architects of Korea, volume 51, issue 6, 2014, Pages 451~458
DOI : 10.3744/SNAK.2014.51.6.451
The purpose of this study is to compare the economics between a diesel propulsion vessel and a LNG fuel propulsion vessel through the analysis of the present value using the LCC(Life Cycle Cost) method. This study is also to judge the economics for long-term operation of a LNG fuel propulsion vessel as a result of analysis about the equivalent uniform annual cost. In particular, LCC method was strengthened by sensitivity analysis based on combined interest rate which is considering discount rate and inflation rate simultaneously.
Systematic Experimental and Numerical Analyses on Added Resistance in Waves
Park, Dong-Min ; Seo, Min-Guk ; Lee, Jaehoon ; Yang, Kyung-Kyu ; Kim, Yonghwan ;
Journal of the Society of Naval Architects of Korea, volume 51, issue 6, 2014, Pages 459~479
DOI : 10.3744/SNAK.2014.51.6.459
This paper considers experimental and numerical studies on added resistance in waves. As the numerical methods, three different methods, strip method, Rankine panel method and Cartesian-grid method, are applied. The computational results of vertical motion response and added resistance are compared with the experimental data of Series 60(
) hull, S175 containership and KVLCC2 hull. To investigate the influence of above-still water hull form, a Rankine panel method is extended to two nonlinear methods: weakly-nonlinear and weak-scatterer approaches. As nonlinear computational models, three ships are considered: original KVLCC2 hull, 'Ax-bow' and 'Leadge-bow' hulls. Two of the three models are modified hull forms of original KVLCC2 hull, aiming the reduction of added resistance. The nonlinear computational results are compared with linear results, and the improvement of computational result is discussed. As experimental approach, a series of towing-tank experiment for ship motions and added resistance on the three models (original KVLCC2 hull, 'Ax-bow' and 'Leadge-bow') are carried out. For the original KVLCC2 hull, uncertainty analysis in the measurement of vertical motion response and added resistance is performed in three waves conditions:
, 1.1, 2.0. From the experimental results, the effects of hull form on added resistance are discussed.
Vortex Shedding Frequency for a 2D Hydrofoil with a Truncated Trailing Edge
Lee, Seung-Jae ; Lee, Jun-Hyeok ; Suh, Jung-Chun ;
Journal of the Society of Naval Architects of Korea, volume 51, issue 6, 2014, Pages 480~488
DOI : 10.3744/SNAK.2014.51.6.480
Vortex shedding which is the dominant feature of body wakes and of direct relevance to practical engineering problems, has been intensively studied for flows past a circular cylinder. In contrast, vortex shedding from a hydrofoil trailing edge has been studied to much less extent despite numerous practical applications. The physics of the problem is still poorly understood. The present study deals with
vortex shedding from a truncated trailing-edge hydrofoil in relatively high Reynolds number flows. The objectives of this paper are twofold. First, we aim to simulate unsteady turbulent flows past a two dimensional hydrofoil through a hybrid particle-mesh method and penalization method. The vortex-in-cell (VIC) method offers a highly efficient particle-mesh algorithm that combines Lagrangian and Eulerian schemes, and the penalization method enables to enforce body boundary conditions by adding a penalty term to the momentum equation. The second purpose is to investigate shedding frequencies of vortices behind a NACA 0009 hydrofoil operating at a zero angle of attack.
Analysis of Strain Gauge Data Onboard the IBRV ARAON during Icebreaking Voyage in the Antarctic Sea Ice
Cheon, Eun-Jee ; Choi, Kyungsik ; Kim, Ho-Yeon ; Lee, Tak-Kee ;
Journal of the Society of Naval Architects of Korea, volume 51, issue 6, 2014, Pages 489~494
DOI : 10.3744/SNAK.2014.51.6.489
Estimation of correct ice load under various operating conditions is important during the design and the operation stages of an icebreaker. Normal operating conditions are expected from the official field ice trials and also from general ice transit action. In this paper ice load for the Korean icebreaking research vessel, ARAON, under normal operating condition, is discussed. Published ice load data from full-scale sea trials of six icebreakers were analysed to derive an empirical ice load prediction formula. The IBRV ARAON had sea ice trials during 2010 and 2012 summer season. Strain gauge signal were recorded during her icebreaking voyage and the measured strain data were converted to the equivalent hull stress values. The effect of ARAON's speed in ice and the hull stresses are investigated. By comparing the empirical formula and ice load calculation based von measured data, it is recommended to use the empirical ice load estimation formula for the initial design stage.
Comparative Study on Mechanical Behavior of Low Temperature Characteristics of Polymeric Foams for Ships and Offshore Structures
Park, Seong-Bo ; Kim, Jeong-Hyeon ; Lee, Jae-Myung ;
Journal of the Society of Naval Architects of Korea, volume 51, issue 6, 2014, Pages 495~502
DOI : 10.3744/SNAK.2014.51.6.495
Glass-reinforced polyurethane foam (R-PUF) is widely used as the primary and secondary insulation of Mark-III type liquefied natural gas (LNG) cargo system. And, polyurethane foam (PUF) and polyisocyanurate foam (PIR) are often used for insulation of onshore structures or LNG storage and pipeline system. These polymeric foam materials are known for the characteristics that mechanical properties are dependent on strain rate and temperature. In this study, compression tests for R-PUF, PIR, and PUF were carried out for the estimation of mechanical behaviors under the cryogenic environment. The range of thermal condition was from room temperature to 110K and strain rates were
. The test results were analyzed based on the conditions of strain-rate and temperature.
Numerical Prediction of Slamming Impact Loads and Response on a Ship in Waves Considering Relative Vertical Velocity
Choi, Mun-Gwan ; Park, In-Kyu ; Koo, WeonCheol ;
Journal of the Society of Naval Architects of Korea, volume 51, issue 6, 2014, Pages 503~509
DOI : 10.3744/SNAK.2014.51.6.503
This paper describes the time-domain numerical method for prediction of slamming loads on a ship in waves using the strip theory. The slamming loads was calculated considering the relative vertical velocity between the instantaneous ship motion and wave elevation. For applying the slamming force on a ship section, the momentum slamming theory and the empirical formula-based bottom slamming force were used corresponding to the vertical location of wetted body surface. Using the developed method, the vertical bending moments, relative vertical velocities, and impact forces of S175 containership were compared in the time series for various section locations and wave conditions.
Quality Verification of Legacy Data of Manufacturing Information System to Improve Results of Shipyard Manufacturing Logistics Simulation
Lee, Jonghak ; Lee, Philippe ; Yoon, Kyungwon ; Nam, Jong-Ho ;
Journal of the Society of Naval Architects of Korea, volume 51, issue 6, 2014, Pages 510~520
DOI : 10.3744/SNAK.2014.51.6.510
Unlike other mass production in small variety, shipbuilding process is a project-based method in single variety, which causes unpredictable volatility in the planning system. In shipyards, series of manufacturing processes from fabrication to erection is sequentially carried out. In order to predict unfavorable changes such as overload or low load of working volume, computerized simulation has been being gradually adopted. The data used in the simulation are processed from the database of the main scheduling and planning system. Thus the quality of those data is very crucial for the meaningful results. Unfortunately, research on the verification of data quality is very rare and hardly known to the authors. In this work, using the database of scheduling and product information system of a large domestic shipyard, the data required for the simulation are qualitatively analyzed and verified.
Improvement of the Resistance Performance for a G/T 29ton Class Coastal Angling Fishing Boat based on Hull-form Design
Ha, Yoon-Jin ; Lee, Young-Gill ; Lee, Seung-Hee ; Kim, Sang-Hyun ; Yu, Jin-Won ; Back, Young-Su ; Bae, Dong-Gyun ;
Journal of the Society of Naval Architects of Korea, volume 51, issue 6, 2014, Pages 521~529
DOI : 10.3744/SNAK.2014.51.6.521
In this study, numerical simulations and model tests are performed for the hull-form development of a G/T 29ton class coastal angling fishing boat. The numerical simulations are mainly used for the design of bow hull-form and the resistance performance is improved by the adoption of high bulbous bow. And, the resistance performances of the existing boat and the designed boat are verified by the model tests. The results of the experiments and calculations show that the effective power of the designed boat is 13.6% less than that of the existing boat at design speed. Therefore, the results of this research could be used as one of the fundamental data for the design of G/T 29ton class coastal angling fishing boat.
A Study on the Weight Estimation Model of Floating Offshore Structures using the Non-linear Regression Analysis
Seo, Seong-Ho ; Roh, Myung-Il ; Shin, Hyunkyoung ;
Journal of the Society of Naval Architects of Korea, volume 51, issue 6, 2014, Pages 530~538
DOI : 10.3744/SNAK.2014.51.6.530
The weight estimation of floating offshore structures such as FPSO, TLP, semi-Submersibles, Floating Offshore Wind Turbines etc. in the preliminary design, is one of important measures of both construction cost and basic performance. Through both literature investigation and internet search, the weight data of floating offshore structures such as FPSO and TLP was collected. In this study, the weight estimation model was suggested for FPSO. The weight estimation model using non-linear regression analysis was established by fixing independent variables based on this data and the multiple regression analysis was introduced into the weight estimation model. Its reliability was within 4% of error rate.
Study of Ship Squat for KVLCC2 in Shallow Water
Yun, Kunhang ; Park, Kyurin ; Park, ByoungJae ;
Journal of the Society of Naval Architects of Korea, volume 51, issue 6, 2014, Pages 539~547
DOI : 10.3744/SNAK.2014.51.6.539
Ship squat is a well known phenomenon, which means an additional sinkage and a change of trim when a ship sails in shallow water. As a series of ship squat study, a HPMM(Horizontal Planar Motion Mechanism) test of KVLCC2 model ship to measure a sinkage and a trim in shallow water was conducted. Additionally a CFD(Computational Fluid Dynamics) analysis was carried out to simulate fluid flows around the ship surface. A change in ship speed, drift angle at three depth conditions(H/T = 1.2, 1.5 & 2.0) is considered for comparing these results. As a result, an increase of the ship speed and the drift angle caused an increase in ship squat in EFD(Experimental Fluid Dynamics), and created a lower pressure on the ship bottom area in CFD. Lastly the sinkage results of KVLCC2 by EFD and CFD are compared to results by three empirical formulas. The tendency of sinkage by EFD and CFD is similar to the results of empirical formulas.
The Effect of Welding Conditions on Tensile Characteristics and Thermal Stress of Al 5083 Alloy Applied to Co-environmental Leisure Ships
Moon, Byung Young ; Lee, Ki Yeol ; Kim, Kyu Sun ;
Journal of the Society of Naval Architects of Korea, volume 51, issue 6, 2014, Pages 548~555
DOI : 10.3744/SNAK.2014.51.6.548
As a considerable, experimental approach, an Auto-carriage type of
welding machine and a MIG(Metal Inert Gas) welding robot under inert gas atmosphere were utilized in order to realize Al 5083 welding applied to hull and relevant components of green Al leisure ships. This study aims at investigating the effect of welding conditions(current, voltage, welding speed, etc) on thermal deformation that occurs as welding operation and tensile characteristics after welding, by using Al 5083, non-ferrous material, applied to manufacturing of co-environmental Al leisure ships. With respect to welding condition to minimize the thermal deformation, 150A and 16V at the wire-feed rate of 6mm/sec were acquired in the process of welding Al 5083 through an auto carriage type of
welding feeder. As to tensile characteristics of Al 5083 welding through a MIG welding robot, most of tensile specimens showed the fracture behavior on HAZ(Heat Affected Zone) located at the area joined with weld metal, except for some cases. Especially, for the case of the Al specimen with 5mm thickness, 284.62MPa of tensile strength and 11.41% of elongation were obtained as an actual allowable tensile stress-strain value. Mostly, after acquiring the optimum welding condition, the relevant welding data and technical requirements might be provided for actual welding operation site and welding procedure specification(WPS).