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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 2, Issue 4 - Dec 2010
Volume 2, Issue 3 - Sep 2010
Volume 2, Issue 2 - Jun 2010
Volume 2, Issue 1 - Mar 2010
Selecting the target year
Stochastic ship roll motion via path integral method
Cottone, G. ; Paola, M. Di ; Ibrahim, R. ; Pirrotta, A. ; Santoro, R. ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 3, 2010, Pages 119~126
DOI : 10.3744/JNAOE.2010.2.3.119
The response of ship roll oscillation under random ice impulsive loads modeled by Poisson arrival process is very important in studying the safety of ships navigation in cold regions. Under both external and parametric random excitations the evolution of the probability density function of roll motion is evaluated using the path integral (PI) approach. The PI method relies on the Chapman-Kolmogorov equation, which governs the response transition probability density functions at two close intervals of time. Once the response probability density function at an early close time is specified, its value at later close time can be evaluated. The PI method is first demonstrated via simple dynamical models and then applied for ship roll dynamics under random impulsive white noise excitation.
Free surface simulation of a two-layer fluid by boundary element method
Koo, Weon-Cheol ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 3, 2010, Pages 127~131
DOI : 10.3744/JNAOE.2010.2.3.127
A two-layer fluid with free surface is simulated in the time domain by a two-dimensional potential-based Numerical Wave Tank (NWT). The developed NWT is based on the boundary element method and a leap-frog time integration scheme. A whole domain scheme including interaction terms between two layers is applied to solve the boundary integral equation. The time histories of surface elevations on both fluid layers in the respective wave modes are verified with analytic results. The amplitude ratios of upper to lower elevation for various density ratios and water depths are also compared.
Development of real-time monitoring system using wired and wireless networks ina full-scale ship
Paik, Bu-Geun ; Cho, Seong-Rak ; Park, Beom-Jin ; Lee, Dong-Kon ; Bae, Byung-Dueg ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 3, 2010, Pages 132~138
DOI : 10.3744/JNAOE.2010.2.3.132
In the present study, the real-time monitoring system is developed based on the wireless sensor network (WSN) and power line communication (PLC) employed in the 3,000-ton-class training ship. The WSN consists of sensor nodes, router, gateway and middleware. The PLC is composed of power lines, modems, Ethernet gateway and phase-coupler. The basic tests show that the ship has rather good environments for the wired and wireless communications. The developed real-time monitoring system is applied to recognize the thermal environments of main-engine room and one cabin in the ship. The main-engine room has lots of heat sources and needs careful monitoring to satisfy safe operation condition or detect any human errors beforehand. The monitoring is performed in two regions near the turbocharger and cascade tank, considered as heat sources. The cabin on the second deck is selected to monitor the thermal environments because it is close to the heat source of main engine. The monitoring results of the cabin show the thermal environment is varied by the human activity. The real-time monitoring for the thermal environment would be useful for the planning of the ventilation strategy based on the traces of the human activity against inconvenient thermal environments as well as the recognizing the temperature itself in each cabin.
Flexible CFD meshing strategy for prediction of ship resistance and propulsion performance
Seo, Jeong-Hwa ; Seol, Dong-Myung ; Lee, Ju-Hyun ; Rhee, Shin-Hyung ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 3, 2010, Pages 139~145
DOI : 10.3744/JNAOE.2010.2.3.139
In the present study, we conducted resistance test, propeller open water test and self-propulsion test for a ship's resistance and propulsion performance, using computational fluid dynamics techniques, where a Reynolds-averaged Navier-Stokes equations solver was employed. For convenience of mesh generation, unstructured meshes were used in the bow and stern region of a ship, where the hull shape is formed of delicate curved surfaces. On the other hand, structured meshes were generated for the middle part of the hull and the rest of the domain, i.e., the region of relatively simple geometry. To facilitate the rotating propeller for propeller open water test and self-propulsion test, a sliding mesh technique was adopted. Free-surface effects were included by employing the volume of fluid method for multi-phase flows. The computational results were validated by comparing with the existing experimental data.
Hydrodynamic interaction with an array of porous circular cylinders
Park, Min-Su ; Koo, Weon-Cheol ; Choi, Yoon-Rak ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 3, 2010, Pages 146~154
DOI : 10.3744/JNAOE.2010.2.3.146
In the present study, the wave excitation forces acting on an array of porous circular cylinders are examined based on diffraction problems. To calculate the wave forces, the fluid domain is divided into three regions i.e. a single exterior region, N interior regions and N beneath regions, and the diffraction in each fluid region is expressed by an eigenfunction expansion method with using 3-dimension liner potential theory (Williams and Li, 2000). Especially, the present method is extended to the case of an array of truncated porous circular cylinders to calculate the heave forces as well as surge and sway forces. To verify this method, the numerical results obtained by eigenfunction are compared with these results obtained by higher order boundary element method (Choi et al., 2000). The numerical results obtained by this study are in good agreement with those results. By changing the numbers of porous circular cylinders, the angle of incident wave and the porosity rate of circular cylinders, the wave excitation forces such as surge, sway and heave on an array of truncated porous circular cylinders are investigated.
Issues in offshore platform research - Part 1: Semi-submersibles
Sharma, R. ; Kim, Tae-Wan ; Sha, O.P. ; Misra, S.C. ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 3, 2010, Pages 155~170
DOI : 10.3744/JNAOE.2010.2.3.155
Availability of economic and efficient energy resources is crucial to a nation's development. Because of their low cost and advancement in drilling and exploration technologies, oil and gas based energy systems are the most widely used energy source throughout the world. The inexpensive oil and gas based energy systems are used for everything, i.e., from transportation of goods and people to the harvesting of crops for food. As the energy demand continues to rise, there is strong need for inexpensive energy solutions. An offshore platform is a large structure that is used to house workers and machinery needed to drill wells in the ocean bed, extract oil and/or natural gas, process the produced fluids, and ship or pipe them to shore. Depending on the circumstances, the offshore platform can be fixed (to the ocean floor) or can consist of an artificial island or can float. Semi-submersibles are used for various purposes in offshore and marine engineering, e.g. crane vessels, drilling vessels, tourist vessels, production platforms and accommodation facilities, etc. The challenges of deepwater drilling have further motivated the researchers to design optimum choices for semi-submersibles for a chosen operating depth. In our series of eight papers, we discuss the design and production aspects of all the types of offshore platforms. In the present part I, we present an introduction and critical analysis of semi-submersibles.
Application of Sensor Technology for the Efficient Positioningand Assembling of Ship Blocks
Lee, Sang-Don ; Eun, Seong-Bae ; Jung, Jai-Jin ; Song, Ha-Cheol ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 3, 2010, Pages 171~176
DOI : 10.3744/JNAOE.2010.2.3.171
This paper proposes the application of sensor technology to assemble ship blocks efficiently. A sensor-based monitoring system is designed and implemented to improve shipbuilding productivity by reducing the labor cost for the adjustment of adequate positioning between ship blocks during pre-erection or erection stage. For the real-time remote monitoring of relative distances between two ship blocks, sensor nodes are applied to measure the distances between corresponding target points on the blocks. Highly precise positioning data can be transferred to a monitoring server via wireless network, and analyzed to support the decision making which needs to determine the next construction process; further adjustment or seam welding between the ship blocks. The developed system is expected to put to practical use, and increase the productivity during ship blocks assembly.