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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Naval Architecture and Ocean Engineering
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Journal DOI :
The Society of Naval Architects of Korea
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Volume & Issues
Volume 3, Issue 4 - Dec 2011
Volume 3, Issue 3 - Sep 2011
Volume 3, Issue 2 - Jun 2011
Volume 3, Issue 1 - Mar 2011
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Comparison of potential and viscous methods for the nonlinear ship wave problem
Kim, Jin ; Kim, Kwang-Soo ; Kim, Yoo-Chul ; Van, Suak-Ho ; Kim, Hyo-Chul ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 3, 2011, Pages 159~173
DOI : 10.3744/JNAOE.2011.3.3.159
The two different numerical approaches for solving the nonlinear ship wave problem are discussed in the present paper. One is based on a panel method, which neglects the viscous effects. The other is based on a finite volume method, which take into account the viscous effects by solving RANS equations. Focus is laid upon on the advantages and disadvantages of two methods. The developed methods are applied to calculating the flow around Series 60 hull to validate the performance of the present nonlinear methods. Although the two methods employ quite different numerical approaches, the calculated wave patterns from both methods show good agreements with the experiments. However the potential method simu-lates the global wave pattern accurately, while the viscous method shows better performance for the local wave prediction near a ship.
Evaluation of the added mass for a spheroid-type unmanned underwater vehicle by vertical planar motion mechanism test
Lee, Seong-Keon ; Joung, Tae-Hwan ; Cheon, Se-Jong ; Jang, Taek-Soo ; Lee, Jeong-Hee ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 3, 2011, Pages 174~180
DOI : 10.3744/JNAOE.2011.3.3.174
This paper shows added mass and inertia can be acquired from the pure heaving motion and pure pitching motion respectively. A Vertical Planar Motion Mechanism (VPMM) test for the spheroid-type Unmanned Underwater Vehicle (UUV) was compared with a theoretical calculation and Computational Fluid Dynamics (CFD) analysis in this paper. The VPMM test has been carried out at a towing tank with specially manufactured equipment. The linear equations of motion on the vertical plane were considered for theoretical calculation, and CFD results were obtained by commercial CFD package. The VPMM test results show good agreement with theoretical calculations and the CFD results, so that the applicability of the VPMM equipment for an underwater vehicle can be verified with a sufficient accuracy.
Research on systematization and advancement of shipbuilding production management for flexible and agile response for high value offshore platform
Song, Young-Joo ; Woo, Jong-Hun ; Shin, Jong-Gye ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 3, 2011, Pages 181~192
DOI : 10.3744/JNAOE.2011.3.3.181
Recently, the speed of change related with enterprise management is getting faster than ever owing to the competition among companies, technique diffusion, shortening of product lifecycle, excessive supply of market. For the example, the compliance condition (such as delivery date, product quality, etc.) from the ship owner is getting complicated and the needs for the new product such as FPSO, FSRU are coming to fore. This paradigm shift emphasize the rapid response rather than the competitive price, flexibility and agility rather than effective and optimal perspective for the domestic shipbuilding company. So, domestic shipbuilding companies have to secure agile and flexible ship production environment that could respond change of market and requirements of customers in order to continue a competitive edge in the world market. In this paper, I'm going to define a standard shipbuilding production management system by investigating the environment of domestic major shipbuilding companies. Also, I'm going to propose a unified ship production management and system for the operation of unified management through detail analysis of the activities and the data flow of ship production management. And, the system functions for the strategic approach of ship production management are investigated through the business administration tools such as performance pyramid, VDT and BSC. Lastly, the research of applying strategic KPI to the digital shipyard as virtual execution platform is conducted.
Experimental study of embedding motion and holding power of drag embedment type anchor on hard and soft seafloor
Shin, Hyun-Kyoung ; Seo, Byoung-Cheon ; Lee, Jea-Hoon ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 3, 2011, Pages 193~200
DOI : 10.3744/JNAOE.2011.3.3.193
As larger ships and floating offshore structures are, and rougher the marine environment becomes nowadays, a drag embedment type anchor of more stable performance and higher holding power is requested. This paper describes an experimental study of the drag embedding motion and the resultant holding force of three types of drag embedment type anchor model (HALL, AC-14, SEC POOL-N, scale 1/10).
Computation of the inviscid drift force caused by nonlinear waves on a submerged circular cylinder
Koh, Hyeok-Jun ; Cho, Il-Hyoung ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 3, 2011, Pages 201~207
DOI : 10.3744/JNAOE.2011.3.3.201
In this paper, we focused on computing the higher-harmonic components of the transmitted wave passing over a submerged circular cylinder to show that it is causing a horizontal negative drift force. As numerical models, a circular cylinder held fixed under free surface in deep water is adopted. As the submergence of a circular cylinder decreases and the incident wavelength becomes longer, the higher-harmonic components of the transmitted wave starts to increase. An increase of the higher-harmonic components of the transmitted wave makes the horizontal drift force be negative. It is also found that the higher-harmonic amplitudes averaged over the transmitted wave region become larger with the increase of wave steepness and wavelength as well as the decrease of submergence depth.
Study on icebreaking performance of the Korea icebreaker ARAON in the arctic sea
Kim, Hyun-Soo ; Lee, Chun-Ju ; Choi, Kyung-Sik ; Kim, Moon-Chan ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 3, 2011, Pages 208~215
DOI : 10.3744/JNAOE.2011.3.3.208
A full-scale field trial in ice-covered sea is one of the most important tasks in the design of icebreaking ships. The first Korean icebreaking research vessel 'ARAON', after her delivery in late 2009, had a sea ice field trial in the Arctic Sea during July-August, 2010. This paper describes the test procedures and data analysis on the icebreaking performance of the IBRV ARAON. The data gathered from the icebreaking performance test in the Chukchi Sea and the Beaufort Sea during the Arctic voyage of ARAON includes the speed and engine power of the ship as well as sea ice thickness and strength data. The air temperature, wind speed and heading of the ship were also measured during each sea ice trial. The ARAON was designed to break 1 m thick level ice with a flexural strength of 630kPa at a continuous speed of 3knots. She is registered as a KR POLAR 10 class ship. The principal dimensions of ARAON are 110 m, 19 m and 6.8 m in length, breadth and draft respectively. She is equipped with four 3,500kW diesel-electric main engines and two Azipod type propulsion motors. Four sea ice trials were carried out to understand the relationship between the engine power and the ship speed, given the Arctic ice condition. The analysis shows that the ARAON was able to operate at 1.5knots in a 2.5m thick medium ice floe condition with the engine power of 5MW, and the speed reached 3.1 knots at the same ice floe condition when the power increased to 6.6MW. She showed a good performance of speed in medium ice floe compared to the speed performance in level ice. More detailed analysis is summarized in this paper.
A hydrodynamic model of nearshore waves and wave-induced currents
Sief, Ahmed Khaled ; Kuroiwa, Masamitsu ; Abualtayef, Mazen ; Mase, Hajime ; Matsubara, Yuhei ;
International Journal of Naval Architecture and Ocean Engineering, volume 3, issue 3, 2011, Pages 216~224
DOI : 10.3744/JNAOE.2011.3.3.216
In This study develops a quasi-three dimensional numerical model of wave driven coastal currents with accounting the effects of the wave-current interaction and the surface rollers. In the wave model, the current effects on wave breaking and energy dissipation are taken into account as well as the wave diffraction effect. The surface roller associated with wave breaking was modeled based on a modification of the equations by Dally and Brown (1995) and Larson and Kraus (2002). Furthermore, the quasi-three dimensional model, which based on Navier-Stokes equations, was modified in association with the surface roller effect, and solved using frictional step method. The model was validated by data sets obtained during experiments on the Large Scale Sediment Transport Facility (LSTF) basin and the Hazaki Oceanographical Research Station (HORS). Then, a model test against detached breakwater was carried out to investigate the performance of the model around coastal structures. Finally, the model was applied to Akasaki port to verify the hydrodynamics around coastal structures. Good agreements between computations and measurements were obtained with regard to the cross-shore variation in waves and currents in nearshore and surf zone.