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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 45, Issue 6 - Dec 2008
Volume 45, Issue 5 - Oct 2008
Volume 45, Issue 4 - Aug 2008
Volume 45, Issue 3 - Jun 2008
Volume 45, Issue 2 - Apr 2008
Volume 45, Issue 1 - Feb 2008
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Numerical Analysis of Ship Motions in Beam Sea Using Unsteady RANS and Overset Grid Methods
Park, Il-Ryong ; Hosseini, Seyed Hamid Sadat ; Stern, Frederick ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 109~123
DOI : 10.3744/SNAK.2008.45.2.109
The present paper presents the CFD result for a beam wave test case. An ONR tumblehome ship model with bilge keels is used. The beam wave test is for zero forward speed and roll and heave 2DOF with wave slope
the ship length. The problems is solved numerically with an unsteady Reynolds averaged Navier-Stokes approach. The free surface flow is computed using a single-phase level-set method and the motions in each time step are integrated using a predictor-corrector iteration approach which uses dynamic overset grids moving with relative ship motion. The predicted CFD results for motions and forces are compared with experimental data, showing a reasonable agreement.
A Study on the Bow Wave Characteristics for the Resistance-Minimized Hull Form of Small Fishing Boat
Yu, Jin-Won ; Lee, Young-Gill ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 124~131
DOI : 10.3744/SNAK.2008.45.2.124
This paper presents the analysis of resistance performance and bow waves for the resistance-minimized hull form of small fishing boat by using numerical simulations and model tests. The resistance-minimized hull form is developed from an original hull form which is selected from existing small fisher boats in our country. In order to estimate the resistance performance for the original and the developed hull form, several numerical simulations and model tests are carried out. Marker and Cell(MAC) method and Marker-Density method are adopted to simulate the free-surface bow waves around advancing hull surface. The results of numerical simulations are compared with the model tests in towing tank. The results show that the resistance performance of the resistance-minimized hull form is improved than that of the original hull form. The results of this study will be a good guide to the hull form development of small fishing boats in future.
A Numerical Study on the Sloshing Characteristics in a Two-dimensional Rectangular Tank Using the Level Set Method
Yoon, Hyun-Sik ; Lee, Jung-Min ; Chun, Hwan-Ho ; Lee, Hyun-Goo ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 132~143
DOI : 10.3744/SNAK.2008.45.2.132
The sloshing phenomena in a two-dimensional rectangular tank are investigated using a level set method based on finite volume method. The code validations are performed by comparing between the present results and previous numerical results, which gives a good agreement. We present the streamlines pattern, free surface shape, maximum free surface elevation and pressure fluctuation patterns in the tank under the pitch and surge motions with various frequencies. These two different motions cause the different flow structures in the tank. The time variations of surface elevation and pressure at the different locations in the tank strongly depend on the exciting frequency of tank moving.
A Study for the Measurement of Global Loads on Ship Structure Using Fiber Optic Sensors
Kim, Myung-Hyun ; Kim, Young-Jae ; Kang, Sung-Won ; Oh, Min-Cheol ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 144~150
DOI : 10.3744/SNAK.2008.45.2.144
Ships and offshore structures are exposed to wave and engine excitation loadings during navigation and cargo/ballasting operations. These excessive loads may cause damages to hull and may result loss of life the ship. Therefore, it is important to develop a system that allow accurate measurements of global hull loads. The objective of the study is developing a fiber optic monitoring system that is capable of monitoring, recording and warning of the vessel performance. A method for measurement of global loads on a vessel, using strain measurements from a network of fiber optic strain sensors and extensive finite-element analyses(FEA) with idealistic load cases, is presented. The method has been successfully validated on the idealized ship structure model with strain sensors.
Optimum Structural Design of Mid-ship Section of D/H Tankers Based on Common Structural Rules
Na, Seung-Soo ; Jeon, Hyoung-Geun ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 151~156
DOI : 10.3744/SNAK.2008.45.2.151
It is necessary to perform the research works on the general structural designs and optimum structural designs of double hull tankers and bulk carriers due to the newly built Common Structural Rules(CSR). In this study, an optimum structural design of a mid-ship part of double hull oil tanker was carried out by using the CSR. An optimum structural design program was developed by using the Pareto optimal based multi-objective function method. The hull weight and fabrication cost obtained by the single and multi-objective function methods were compared with existing ship by the consideration of CSR and material cost which is recently increasing.
Experimental and Theoretical Investigations on the Fracture Criteria for Structural Steels
Choung, Joon-Mo ; Cho, Sang-Rai ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 157~167
DOI : 10.3744/SNAK.2008.45.2.157
Six smooth flat tensile specimens and eighteen punch specimens with three different thicknesses were machined from steel of JIS G3131 SPHC. In addition to punch tests, incremental tensile tests were conducted to obtain average true flow stress - logarithmic true strain curves. Through parametric FE simulations for the tensile specimens, material parameters related to GTN model were identified. Using indenters with three kinds of radius, punch tests were carried out to obtain fracture characteristics of punch specimens. Numerical analyses using both fracture models, GTN and
plasticity model, gave that the former estimated well the fracture of punch specimen but the latter did not. A new concept for critical size of plate elements was introduced based on minimum relative sharpness between contact structures. Consequently, a new criterion for critical element size was proposed to be less than 20% of minimum relative radius of interacting structures.
Fluid-Structure Interaction Analysis for Structure in Viscous Flow
Nho, In-Sik ; Shin, Sang-Mook ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 168~174
DOI : 10.3744/SNAK.2008.45.2.168
To calculate the fluid-structure interaction(FSI) problem rationally, it should be the basic technology to analyse each domain of fluid and structure accurately. In this paper, a new FSI analysis algorithm was introduced using the 3D solid finite element for structural analysis and CFD code based on the HCIB method for viscous flow analysis. The fluid and structural domain were analysed successively and alternatively in time domain. The structural domain was analysed by the Newmark-b direct time integration scheme using the pressure field calculated by the CFD code. The results for example calculation were compared with other research and it was shown that those coincided each other. So we can conclude that the developed algorithm can be applied to the general FSI problems.
Ice Load Prediction Formulas for Icebreaking Cargo Vessels
Choi, Kyung-Sik ; Jeong, Seong-Yeob ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 175~185
DOI : 10.3744/SNAK.2008.45.2.175
One of the concerns that arise during navigation in ice-covered waters is the magnitude of ice loads encountered by ships. However, the accurate estimation of ice loads still remains as a rather difficult task in the design of icebreaking vessels. This paper focuses on the development of simple ice load prediction formulas for the icebreaking cargo vessels. The maximum ice loads are expected from unbroken ice sheet and these loads are most likely to be concentrated at the bow area. Published ice load data for icebreaking vessels, from the model tests and also from full-scale sea trials, are collected and then several ice load prediction formulas are compared with these data. Finally, based on collected data, a semi-empirical ice load prediction formula is recommended for the icebreaking cargo vessels.
Non-linear Large Deformation Analysis of Elastic Rubber Mount
Nho, In-Sik ; Kim, Jong-Man ; Kwak, Jeong-Seok ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 186~191
DOI : 10.3744/SNAK.2008.45.2.186
A lot of equipments installed in ships must be isolated for relaxing the shock, vibration and noise using the elastic mounts. Most of the elastic mounts are made of the rubber, however it is not easy to design the effective rubber mount. Because, in general, the rubber has a non-linear constitutive characteristics especially for a large deformation. So, there are many difficulties to estimate the accurate structural response of rubber which is the basis of the shape design of the mounts. In this study, the detailed non-linear viscoelastic large deformation finite element analysis method was dealt with. And to verify validity of the present analysis scheme, the results were compared with experiments.
A Study on the Application of FBS Design Model to Preliminary Ship Design
Park, Chang-Kue ; Yang, Young-Soon ; Pyo, Sang-Woo ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 192~201
DOI : 10.3744/SNAK.2008.45.2.192
The design process becomes more difficult due to the increasing complexity of products. Thus, without any proper design experience, designer cannot handle his design problems systematically. Besides, the conventional optimal design method cannot be used effectively at the early design stage, since most design problems must be formulated in terms of objective and constraint functions based on the mathematical concepts of Operation Research. Thus, in this paper, new design concept based on FBS (Function-Behavior-Structure) design model is introduced to help the novice designer formulate the complex design problems systematically into a mathematical form. In this FBS model, function means the designer's new intents designer wants to create for, structure stand for a final product configuration and behaviour is a product's performance. FBS design model is thus rather totally different concept used for formulating design problem, compared with conventional optimal design method. To validate this new FBS model, 330K VLCC design case is performed, and we found, though it is one design example case, that this new design concept could be effectively used for future ship design problems since, during the formulating design problem, the only engineering terminology such as function, structure, and behaviour of design product is used based on the engineering concepts, instead of mathematical terminology such as objective and constraints.
Development of a Design Framework for Simulation Based Shipyard Layout
Song, Young-Joo ; Lee, Kwang-Kook ; Lee, Dong-Kun ; Hwang, In-Hyuck ; Woo, Jong-Hun ; Shin, Jong-Gye ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 202~212
DOI : 10.3744/SNAK.2008.45.2.202
In recent days, global shipbuilding companies have been increasing their productivity or expanding their shipyards for a large amount of orders. Though, few researches about the shipyard layout designs have been studied. This research presents a simulation-based shipyard layout design framework to resolve the problems of the shipyard layout design. The shipyard layout design framework was developed on the basis of systems engineering method. The disciplined system engineering technique was guided by ISO/IEC 15288 during the planning phase of the shipyard layout design framework development. This framework suggests that how efficient and effective shipyard layout design could be got, that can satisfy the stakeholder of the layout. Furthermore, it is recommended that how the proposed shipyard layout should be verified and validated by digital simulation model. It is expected that the framework will contribute to not only the improvement of the existing shipyard but also the construction of the new shipyard.
A Study on Development of Ship Economic Evaluation System Using ASMOD
Shin, Soo-Chul ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 213~220
DOI : 10.3744/SNAK.2008.45.2.213
The aim of this paper is to build up the design model using ASMOD(Adaptive Spline Modeling of Observation Data) for the optimum scale of fleet, ship particulars and ship speed, etc. ASMOD, which define membership functions of fuzzy rule as B-spline basis function, represents a whole system as the sum of the sub-model. As it reduces the number of division of the space generated by the fuzzy set of input variables, it has a advantage of simplification to model structure and is efficient to represent the non-linear model.
A Study on Preliminary Design of Warships by Economic Evaluation
Shin, Soo-Chul ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 2, 2008, Pages 221~228
DOI : 10.3744/SNAK.2008.45.2.221
This paper describes to determine optimum main particulars of warships which satisfy user's requirements in a concept design stage with minimum construction cost and maximum transportation efficiency. Present worth was used as an assessment criteria of the economical efficiency. And Pareto optimal set was used to have the optimum design.