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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
International Journal of Naval Architecture and Ocean Engineering
Journal Basic Information
Journal DOI :
The Society of Naval Architects of Korea
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Volume & Issues
Volume 4, Issue 4 - Dec 2012
Volume 4, Issue 3 - Sep 2012
Volume 4, Issue 2 - Jun 2012
Volume 4, Issue 1 - Mar 2012
Selecting the target year
Numerical study of hydrodynamic interaction on a vessel in restricted waterways
Lee, Chun-Ki ;
International Journal of Naval Architecture and Ocean Engineering, volume 4, issue 1, 2012, Pages 1~8
DOI : 10.3744/JNAOE.2012.4.1.001
The hydrodynamic interaction between ship and bank can't be neglected when a vessel is app- roached toward the tip of a wedge-shaped bank in restricted waterways, such as in a harbor, near some fixed obstacles, or in a narrow channel. In this paper, the characteristic features of the hydrodynamic interaction acting on a slowly moving vessel in the proximity of a wedge-shaped bank are described and illustrated, and the effects of water depth and the spacing between ship and wedge-shaped bank are summarized and discussed based on the slender body theory. From the theoretical results, it indicated that the hydrodynamic interactions decrease as wedge-shaped bank of angle
in-creases. For water depth to draft ratio less than about 2.0, the hydrodynamic interactions between ship and bank in-crease sharply as h/d decreases, regardless of the wedge-shaped bank of angle
. Also, for lateral separation more than about 0.2L between ship and wedge-shaped bank, it can be concluded that the bank effects decrease largely as the separation increases.
Study on dynamic behavior analysis of towed line array sensor
Shin, Hyun-Kyoung ; Ryue, Jung-Soo ; Ahn, Hyung-Taek ; Seo, Hee-Seon ; Kwon, Oh-Cho ;
International Journal of Naval Architecture and Ocean Engineering, volume 4, issue 1, 2012, Pages 9~19
DOI : 10.3744/JNAOE.2012.4.1.009
A set of equations of motion is derived for vibratory motions of an underwater cable connected to a moving vehicle at one end and with drogues at the other end. From the static analysis, cable configurations are obtained for different vehicle speeds and towing pretensions are determined by fluid resistance of drogues. Also the dynamic analysis is required to predict its vibratory motion. Nonlinear fluid drag forces greatly influence the dynamic tension. In this study, a numerical analysis program was developed to find out the characteristic of cable behaviour. The motion is described in terms of space and time coordinates based on Chebyshev polynomial expansions. For the spatial integration the collocation method is employed and the Newmark method is applied for the time integration. Dynamic tensions, displacements, velocities, accelerations were predicted in the time domain while natural frequencies and transfer functions were obtained in the frequency domain.
Development of radar cross section analysis system of naval ships
Kim, Kook-Hyun ; Kim, Jin-Hyeong ; Choi, Tae-Muk ; Cho, Dae-Seung ;
International Journal of Naval Architecture and Ocean Engineering, volume 4, issue 1, 2012, Pages 20~32
DOI : 10.3744/JNAOE.2012.4.1.020
A software system for a complex object scattering analysis, named SYSCOS, has been developed for a systematic radar cross section (RCS) analysis and reduction design. The system is based on the high frequency analysis methods of physical optics, geometrical optics, and physical theory of diffraction, which are suitable for RCS analysis of electromagnetically large and complex targets as like naval ships. In addition, a direct scattering center analysis function has been included, which gives relatively simple and intuitive way to discriminate problem areas in design stage when comparing with conventional image-based approaches. In this paper, the theoretical background and the organization of the SYSCOS system are presented. To verify its accuracy and to demonstrate its applicability, numerical analyses for a square plate, a sphere and a cylinder, a weapon system and a virtual naval ship have been carried out, of which results have been compared with analytic solutions and those obtained by the other existing software.
The development of internet based ship design support system for small and medium sized shipyards
Shin, Sung-Chul ; Lee, Soon-Sup ; Kang, Dong-Hoon ; Lee, Kyung-Ho ;
International Journal of Naval Architecture and Ocean Engineering, volume 4, issue 1, 2012, Pages 33~43
DOI : 10.3744/JNAOE.2012.4.1.033
In this paper, a prototype of ship basic planning system is implemented for the small and medium sized shipyards based on the internet technology and concurrent engineering concept. The system is designed from the user requirements. Consequently, standardized development environment and tools are selected. These tools are used for the system development to define and evaluate core application technologies. The system will contribute to increasing competitiveness of small and medium sized shipyards in the 21st century industrial en-vironment.
Shape optimization of an autonomous underwater vehicle with a ducted propeller using computational fluid dynamics analysis
Joung, Tae-Hwan ; Sammut, Karl ; He, Fangpo ; Lee, Seung-Keon ;
International Journal of Naval Architecture and Ocean Engineering, volume 4, issue 1, 2012, Pages 44~56
DOI : 10.3744/JNAOE.2012.4.1.044
Autonomous Underwater Vehicles (AUVs) provide a useful means of collecting detailed oceano-graphic information. The hull resistance of an AUV is an important factor in determining the power requirements and range of the vehicle. This paper describes a procedure using Computational Fluid Dynamics (CFD) for determining the hull resistance of an AUV under development, for a given propeller rotation speed and within a given range of AUV velocities. The CFD analysis results reveal the distribution of the hydrodynamic values (velocity, pressure, etc.) around the AUV hull and its ducted propeller. The paper then proceeds to present a methodology for optimizing the AUV profile in order to reduce the total resistance. This paper demonstrates that shape optimization of conceptual designs is possible using the commercial CFD package contained in Ansys
. The optimum design to minimize the drag force of the AUV was identified for a given object function and a set of constrained design parameters.
Effect of bidirectional internal flow on fluid.structure interaction dynamics of conveying marine riser model subject to shear current
Chen, Zheng-Shou ; Kim, Wu-Joan ;
International Journal of Naval Architecture and Ocean Engineering, volume 4, issue 1, 2012, Pages 57~70
DOI : 10.3744/JNAOE.2012.4.1.057
This article presents a numerical investigation concerning the effect of two kinds of axially progressing internal flows (namely, upward and downward) on fluid.structure interaction (FSI) dynamics about a marine riser model which is subject to external shear current. The CAE technology behind the current research is a proposed FSI solution, which combines structural analysis software with CFD technology together. Efficiency validation for the CFD software was carried out first. It has been proved that the result from numerical simulations agrees well with the observation from relating model test cases in which the fluidity of internal flow is ignorable. After verifying the numerical code accuracy, simulations are conducted to study the vibration response that attributes to the internal progressive flow. It is found that the existence of internal flow does play an important role in determining the vibration mode (/dominant frequency) and the magnitude of instantaneous vibration amplitude. Since asymmetric curvature along the riser span emerges in the case of external shear current, the centrifugal and Coriolis accelerations owing to up- and downward internal progressive flows play different roles in determining the fluid.structure interaction response. The discrepancy between them becomes distinct, when the velocity ratio of internal flow against external shear current is relatively high.