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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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The Society of Naval Architects of Korea
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Volume & Issues
Volume 40, Issue 6 - Dec 2003
Volume 40, Issue 5 - Oct 2003
Volume 40, Issue 4 - Aug 2003
Volume 40, Issue 3 - Jun 2003
Volume 40, Issue 2 - Apr 2003
Volume 40, Issue 1 - Feb 2003
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3-Dimensional Underwater Explosion Shock Response Analysis of a Floating Structure considering Cavitation Effects
Journal of the Society of Naval Architects of Korea, volume 40, issue 6, 2003, Pages 1~11
DOI : 10.3744/SNAK.2003.40.6.001
For an accurate shock response analysis of a floating structure such as a naval surface ship subjected to an UNDEX(UNDerwater Explosion), the cavitation effects due to reflected wave at free surface and wetted structural surface should be considered. In this study, for the consideration of cavitation effects an effective method using LS-DYNA/USA and its theoretical background were presented. Through the application of the analysis of bulk cavitation phenomena in the free field, it could be confirmed that almost the same results were obtained between LS-DYNA/USA code and the analytical method. for the investigation of cavitation effects from the structural shock response characteristics, three dimensional UNDEX shock response analysis of an idealized ship model was also carried out It could be found that the cavitation Phenomena gave significant effects on the structural shock response characteristics, and especially that the shock loadings calculated at the installed location of shipboard equipment were underestimated in the case of no consideration of the cavitation effects, which might cause the severe mistake in its shock-resistance design.
Minimum Weight Design for Watertight and Deep Tank Corrugated Bulkhead
Journal of the Society of Naval Architects of Korea, volume 40, issue 6, 2003, Pages 12~19
DOI : 10.3744/SNAK.2003.40.6.012
Corrugated bulkheads for a bulk carrier are divided into watertight bulkheads and deep tank bulkheads. Design of the watertight bulkheads is principally determined by the permissible limit of Classification and IACS requirements. But, the verification of strength through finite element analysis is indispensable for design of the deep tank bulkheads. A stage for stress evaluation of corrugated part is required for optimum structural design of the deep tank bulkheads. Since the finite element analysis for real model requires excessive amount of calculation time, in this study one corrugated structure is replaced with beam element and is idealized as 2 dimensional frame structure connected to upper and lower stool Minimum weight design of the deep tank bulkheads is performed through generalized sloped deflection method(GSDM) as direct calculation method. The purpose of this study is the development of design system for the minimization of steel weight of deep tank bulkheads as well as watertight bulkheads. Discrete variables are used as design variables for the practical design. Evolution strategies(ES) is used as an optimization technique.
Development of an Arctic Tanker Design
Journal of the Society of Naval Architects of Korea, volume 40, issue 6, 2003, Pages 20~29
DOI : 10.3744/SNAK.2003.40.6.020
When Arctic offshore development in the 1970`s first led to the consideration of ice capable tankers, there was a high level of uncertainty over design requirements for both safety and ship performance. Also here was a lack of reliable methods to evaluate design proposals. Since that time, improved understanding of the ice environment has raised the confidence of design specifications. Parallel developments have resulted in a suite of engineering tools for ship performance evaluation at the design stage Recent development of offshore and near shore oil and gas reserves in several countries together with economic studies of increased transportation through the Russian Arctic has newly introduced the interest in ice capable tanker design. in response, Samsung Heavy Industries (SHI) applied its experience in tanker design and construction to the design of a specialized tanker with ice capability. SHI produced two prototype hull designs for further study. The performance of both hulls and of the propellers was evaluated at the Institute for Marine Dynamics (IMD) in St. John`s, Newfoundland This paper discusses the development of the design, describes the model experiments to determine performance and variations, and presents the results.
A Study on the 3-D Geometric Modeler for Safety Assessment of Damaged Ships
Journal of the Society of Naval Architects of Korea, volume 40, issue 6, 2003, Pages 30~36
DOI : 10.3744/SNAK.2003.40.6.030
To improve survivability of damaged ship, assessment of stability and structural safety, and behavior analysis in wave is required. Prediction of sinking time, damage stability and structural strength considering progressive flooding and dynamic force in wave is very important. To do it, a geometric model which can be express damaged ship is prepared. This paper described the geometric modeler for survivability assessment of damaged ship. The modeler is developed based on 3-D geometric modeling kernel, ACIS. The hull form and compartment definition is available fundamentally. And requirement for modeler contains data generation and interface for hydrostatic calculation, behavior analysis, and longitudinal strength analysis and so on. To easy access modeling system by conventional user such as crew, user interface is developing.
Strength Evaluation of a Doubler Plate of Ship Structure subjected to the In-plane Combined Load and Lateral Pressure Load
Ham, Juh-Hyeok ;
Journal of the Society of Naval Architects of Korea, volume 40, issue 6, 2003, Pages 37~48
DOI : 10.3744/SNAK.2003.40.6.037
A study for the structural strength evaluation of doubler plates subjected to the in-plane combined load and lateral pressure load has been performed through a systematic evaluation process. In order to properly estimate the static strength of doubler plate, elasto-plastic large deflection analysis is introduced including the contact effect between main plate and doubler. The characteristics of stiffness and strength variation are discussed based on the analysis results. Also, in order to compare the doubler structure with the original strength of main plate without doubler, a simple formula for the evaluation of the equivalent flat plate thickness is derived based on the additional series analysis of fiat plate structure. Using this derived equation, the thickness change of a equivalent flat plate is analyzed according to the variation of various design parameters of doubler plate and some design guides are suggested In order to maintain the original strength of main plate without doubler reinforcement. Finally, correlation between derived equivalent plate thickness formula and the developed buckling strength formulas for intact plates by author et al. is discovered and these relations are formulated for the future development of simple strength evaluation formula of doubler plate structure.
Interlaminar Stress Analysis of the Mechanical Joint of the Composite Materials
Journal of the Society of Naval Architects of Korea, volume 40, issue 6, 2003, Pages 49~57
DOI : 10.3744/SNAK.2003.40.6.049
This method surely needs a hole that causes local strength and stiffness deterioration of the structure because of stress intensity. In this work, three dimensional stress analysis of pin-loaded joint for quasi-isotropic composite laminates was performed using commercial finite element software. Stress distribution was calculated near the edge of the pin-leaded hole and effects of the stacking sequence on the delamination were investigated. Also, the delamination strength of the composite laminates was predicted using the Ye-delamination failure criterion and compared with the experimental results. finally, newly modified failure criterion has been suggested owing to the consideration of effects of interlaminar normal stress on the delamination strength.
Extraction of Design Information using the Symbol Recognition from Midship Drawings
Journal of the Society of Naval Architects of Korea, volume 40, issue 6, 2003, Pages 58~68
DOI : 10.3744/SNAK.2003.40.6.058
Despite the availability of 3D CAD systems, the designers in shipyards still use 2D CAD systems because of the need to produce drawings rapidly and a shortage of labor. The design information of ship structure contained in 2D drawings is represented by symbols that are well known among designers in shipyard. The shapes of symbols are recognized by analysis of experienced and knowledgeable designers. We propose a method for automatic recognition of 2D symbols and extraction of design information from the midship drawings. The shape and rationale of 20 symbols used in ship design have been analyzed, and symbols have been classified according to the analysis. Based on the classified symbols, the developed system recognizes the symbols expressed in 2D drawings. The meaningless geometric shape is translated into the design information including designer`s intents. The extracted design data can be applied to the downstream design process in shipyards, and the 3D ship model can be automatically created.
Development of Internet-Based Propeller Design System
Journal of the Society of Naval Architects of Korea, volume 40, issue 6, 2003, Pages 69~79
DOI : 10.3744/SNAK.2003.40.6.069
Existing large-scale complex programs usually reside In a single computer, and the user has to be physically in contact with the computer. With the wide spread use of the internet, the need to carry out the design and analysis tasks geographically away from the main computer is increasing. In this paper existing Windows-based propeller design and analysis package is separated into the server-client modules and the protocol program is developed to implement the communication between multi-client computers and a single server computer. A new protocol packet is designed to use the Windows socket and the server/client programs control the receive/send operations using the information transmitted in the packet. Test runs show that the remote user, connected to the server computer through the internet only, can perform the required tasks.
A Study on Vibration Characteristics in Water Tank Structures -Change of Aspect Ratio and Pressure Distribution-
Journal of the Society of Naval Architects of Korea, volume 40, issue 6, 2003, Pages 80~87
DOI : 10.3744/SNAK.2003.40.6.080
Tank structures in ships are in contact with various fluid. The vibration characteristics of those structures are strongly affected by the added mass due to containing fluid. It is important to predict vibration characteristics of tank structures, but it is difficult to do. That`s because the interaction problem concerned with the free surface, the variation of water depth and stiffener is to be considered between the fluid and the structure. Many authors have studied vibration of rectangular tank structures containing water. Kito studied added mass effect of water in contact with thin elastic flat plates. Kim et al. studied flexural vibration of stiffened plates in contact with water. However, few researches on dynamic interaction tank walls with water are reported in the vibration of rectangular tanks recently. in the present report, the coupling effect of added mass of fluid and structural constraint between panels on each vibration mode changing breadth of elastic plate, and dynamic pressure distribution have investigated numerically and discussed.
A Study on Vibration Characteristics with Sloshing Mode Effect in Water Tank Structure
Bae, Sung-Yong ;
Journal of the Society of Naval Architects of Korea, volume 40, issue 6, 2003, Pages 88~95
DOI : 10.3744/SNAK.2003.40.6.088
Liquid storage rectangular tank structures are used in many fields of airplane and marine engineering. Fatigue damages are sometimes observed in these tanks which seem to be caused by resonance. Therefore it is essentially important to estimate vibration characteristics of tank structures. Many Investigators studied the vibration of cylindrical and rectangular tank structures containing still fluid. In general, the eigenbehavior of interior liquid is characterized by the sloshing mode while that of the structure by the bulging mode. However, the structure deformation to the sloshing mode and the liquid free-surface fluctuation to the bulging mode have been neglected in the classical added-mass computation. in the present paper, we study the vibration characteristics with sloshing mode effect.