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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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A Dynamic Response Analysis of Tension Leg Platforms Including Drag Forces in Regular Waves
Ha, Young-Rok ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 229~237
DOI : 10.3744/SNAK.2008.45.3.229
For predicting the motion and structural responses of tension leg platforms(TLPs) in regular waves, a numerical scheme is introduced. The numerical approach in this paper is based on a combination of the three dimensional source distribution method and the finite element method. The hydrodynamic interactions among TLP members, such as columns and pontoons, are included in the motion and structural response analysis. The drag forces on the submerged slender members, which are proportional to the square of relative velocity, are newly included in order to estimate the responses of members with better accuracy. Comparisons with other's results verifies the works in this paper.
Cavitation Observation and Visualization of the Gap Flows on a Rudder Influenced by Propeller Slipstream and Hull Wakes
Paik, Bu-Geun ; Kim, Kyung-Youl ; Ahn, Jong-Woo ; Park, Sun-Ho ; Heo, Jae-Kyung ; Yu, Byeong-Seok ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 238~246
DOI : 10.3744/SNAK.2008.45.3.238
In the present study, the influences on the gap cavitaiton of the semi-spade rudder are investigated experimentally in the condition with propeller and hull wakes. To reduce the scale effect in the given experimental conditions, 1/28.5-scale-down models of propeller and rudder are manufactured. We have the propeller rotate ahead of the rudder, inducing the three dimensional effects originated from the propeller action. Experimental methods are composed of the cavitation observation using high speed camera, PIV (particle image velocimetry) measurements to visualize the cavitaition and flows around the gap. The propeller slipstream affects both of the gap flows and cavitation of the rudder.
Development of Free Running System for 2m-class Ship Models
Shin, Hyun-Kyoung ; Kim, Min-Sung ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 247~257
DOI : 10.3744/SNAK.2008.45.3.247
In this paper, a free running system, which is developed recently for a 2m-class ship models, will be introduced. For the remote control of hardware, GUI of software packages was developed using Visual Basic 6.0, and Host PC with Positioning Board manages Servo drive. Then the drive operates propeller and rudder. Its control performance will be shown. Also its adaptability to the resistance, manoeuverability and seakeeping model tests will be considered through the installation on a KTTC standard ship model from MOERI.
Numerical Study of the Radiation Potential of a Ship Using the 3D Time-Domain Forward-Speed Free-Surface Green Function and a Second-Order BEM
Hong, Do-Chun ; Hong, Sa-Young ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 258~268
DOI : 10.3744/SNAK.2008.45.3.258
The radiation potential of a ship advancing in waves is studied using the 3D time-domain forward-speed free-surface Green function and the Green integral equation. Numerical solutions are obtained by making use of the 2nd order BEM(Boundary Element Method) which make it possible to take account of the line integral along the waterline in a rigorous manner. The 6 degree of freedom motion memory functions of a hemisphere and the Wigley seakeeping model obtained by direct integration of the time-domain 3D potentials over the wetted surface are presented for various Froude numbers.
A Study on the Underwater Navigation System with Adaptive Receding Horizon Kalman Filter
Jo, Gyung-Nam ; Seo, Dong-C. ; Choi, Hang-S. ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 269~279
DOI : 10.3744/SNAK.2008.45.3.269
In this paper, an underwater navigation system with adaptive receding horizon Kalman filter (ARHKF) is studied. It is well known that incorrect statistical information and temporal disturbance invoke errors of any navigation systems with Kalman filter, which makes the autonomous navigation difficult in real underwater environment. In this context, two kinds of problems are herein considered. The first one is the development of an algorithm, which estimates the noise covariance of a linear discrete time-varying stochastic system. The second one is the implementation of ARHKF to underwater navigation systems. The performance of the derived estimation algorithm of noise covariance and the ARHKF are verified by simulation and experiment in the towing tank of Seoul National University.
Prediction of Manoeuvrability of a Ship with Low Forward Speed in Shallow Water
Kim, Se-Won ; Yeo, Dong-Jin ; Rhee, Key-Pyo ; Kim, Dong-Jin ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 280~287
DOI : 10.3744/SNAK.2008.45.3.280
In this paper, a mathematical model for a ship manoeuvring with low forward speed in shallow water was suggested. Based on the cross flow model with low forward speed in deep sea, hull, propeller and rudder models were modified to consider the shallow water effects. Static drift and PMM tests were performed to obtain the cross flow drag coefficients and hydrodynamic coefficients. To validate suggested mathematical model, numerical simulation results were compared with those of sea-trials. Through comparisons, it was concluded that suggested mathematical model could give proper estimation on turning test results.
A Study on Development of an Active Hybrid Mount for Naval Ships
Moon, Seok-Jun ; Ji, Yong-Jin ; Yoon, Jeong-Sik ; Choi, Seung-Bok ; Lee, Hyun-Yup ; Kim, Jae-Ho ; Jung, Woo-Jin ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 288~295
DOI : 10.3744/SNAK.2008.45.3.288
Passive-type control devices such as resilient mounts and wire rope isolators are generally used for protecting the shipboard equipment from shock loading and for suppressing the mechanical vibration of the equipment in naval ships. To improve the performance of the control device, a new hybrid mount is under development in this study. This mount consists of a passive-type rubber element and an active-type piezo-stack element. It can be expected that the mount has enhanced performance of about 20 dB or more with respect to transmissibility through a series of performance tests of prototype mount.
A Comparative Study for the Fatigue Assessment of Side Shell Longitudinals on 8,100 TEU Container Carrier using Hot Spot Stress and Structural Stress Approaches
Kim, Seong-Min ; Kim, Myung-Hyun ; Kang, Sung-Won ; Pyun, Jang-Hoon ; Kim, Young-Nam ; Kim, Sung-Geun ; Lee, Kyong-Eon ; Kim, Gyeng-Rae ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 296~302
DOI : 10.3744/SNAK.2008.45.3.296
Recently, a mesh-size insensitive structural stress definition (structural stress method) is proposed that gives a stress state at weld toe with a relatively large mesh size. The structural stress definition is based on the elementary structural mechanics theory and provides an effective measure of a stress state in front of weld toe. In this study, a fatigue strength assessment for a side shell connection of a container vessel using both the hot spot stress and the Battelle structural stress method was carried out. A consistent approach to compute the extrapolated hot spot stress for design purpose is described and current fatigue guidance is evaluated. Fatigue strength predicted by the two methodologies, e.g. hot spot stress and structural stress approaches, at hot spot locations of a typical ship structure are compared and discussed.
A Study of Bending Using Long Type Coil by Discrete Method
Lee, Young-Hwa ; Jang, Chang-Doo ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 303~308
DOI : 10.3744/SNAK.2008.45.3.303
The induction heating is more efficient for a plate bending because of its easy operation and control of working parameters, compared with the heating by a gas torch. The existing axis symmetric analysis method could neither handle initial curved plates nor be used in the optimization of coil shapes because of its limit of an axis symmetric coil shape. But the proposed method using some discrete part models and analysis processes could overcome these difficulties and show more accurate results in temperatures and deflections of flat or curved plates with initial curvature than those in the existing axis symmetric analysis method. This method is composed of the multi-disciplinary analyses such as an electro magnetic analysis, a heat transfer analysis and a deformation analysis based on inherent strain approach per each step. Traditionally, the coil shape in the induction heating is circular shape and it needs the moving process along heating lines. To overcome this, the 'Long Type Coil' with some linear parallel coils was proposed. It did not need the moving process along heating lines and reduced the heating process time. The results of experiments were compared with those of the simulation.
The Added Mass and Damping for the Axial Rigid Body Motion of a Marine Propeller Rotating in a Uniform Flow
Kim, Young-Joong ; Lee, Hyun-Yup ; Lee, Chang-Sup ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 309~314
DOI : 10.3744/SNAK.2008.45.3.309
An experimental method to estimate the added mass of a marine propeller has been developed for the axial rigid body motion in still water, and the experiments have been carried out. The experimental result has been compared to the theoretical result by PRODAS based on the unsteady lifting surface theory. The experimental method developed in this research and the theoretical method by PRODAS have been validated by confirming good agreements between the experimental results and the theoretical ones. Also the comparison to the results by empirical formula has been made and discussed.
Development of Monitoring System for Hull Construction Processes Using TOC Analysis
Yun, Hoon-Hee ; Sheen, Dong-Mok ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 315~321
DOI : 10.3744/SNAK.2008.45.3.315
A large ship usually consists of 300 to 500 blocks, for which it is extremely difficult to monitor the whole manufacturing processes from assembly to erection. In an effort to unify all the data and procedures, shipbuilding companies are installing ERP systems, which have brought great improvement throughout the company as a whole. In some departments, however, the ERP systems are not being fully utilized. This paper analyzes and solves the problems revealed especially at the production departments after an ERP system is installed. In this research, firstly a TOC(Theory of Constraints) analysis is done to find out the best solution for those problems. Secondly, based on the solution found, a Monitoring System for hull construction processes is developed with an improved user interface. The visualization of data is designed to reflect the needs of the production departments. The new system supplements the ERP system in that it selectively utilizes the unified data base and is operated under ERP environment. The system is installed in the production departments and its usefulness is verified.
Development of Web-based MDO Framework for Design and Analysis Integration
Park, Chang-Kue ; Yang, Young-Soon ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 322~328
DOI : 10.3744/SNAK.2008.45.3.322
Recently, the rapid progress of Internet and Network affects engineering design environment as well as Business fields to utilize Web technologies to enhance it's competitively in the world. In product development, experts and organizations actually taking part in the design process are often geographically dispersed. Furthermore, different divisions and businesses often have heterogeneous CAD/CAE systems and methods for expressing product data, and addressing this heterogeneity creates additional costs and causes longer development periods. To ensure successful collaboration in the design process, it is therefore imperative that distributed CAD, CAE, and other related systems be managed in an organic and integrated manner from the initial stages of product development. Therefore, this study suggests Web-based MDO(Multidisciplinary Design Optimization) framework to support interfacing and the collective use of design and analysis tools.
Experimental Tests on the Wireless Sensor Network and the Power-line Communication in a Real Ship and Laboratory
Paik, Bu-Geun ; Cho, Seong-Rak ; Park, Beom-Jin ; Cho, In-Sung ; Lee, Dong-Kon ; Yun, Jong-Hwui ; Bae, Byung-Dueg ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 329~336
DOI : 10.3744/SNAK.2008.45.3.329
Basic performances of wireless sensor network (WSN) and power line communication (PLC) confirmed in the test bed ashore are investigated in the 3000-ton class training ship of Korea Maritime University. The ubiquitous technologies can be considered for the provision of safety and convenience in a ship. We employed WSN and PLC, as the ubiquitous technologies, at the two areas within the training ship to estimate the realization of the ubiquitous environments in a ship. The experiments show rather good results in terms of data transfer rate. However, more detailed studies concerning the connection between WSN and PLC, noises induced to power line and fading effects are required to improve the quality and the stability of the communication for the ubiquitous environments.
Comparisons of Hydrodynamic Characteristics of Superyacht with Respect to the Variation of Hull Form
Kim, Tae-Yun ; Hyun, Beom-Soo ;
Journal of the Society of Naval Architects of Korea, volume 45, issue 3, 2008, Pages 337~343
DOI : 10.3744/SNAK.2008.45.3.337
There are various hull types on the mid-size superyachts around
. In any case, it is important to design the proper hull shape in viewpoint of the reduction of wave resistance, because small vessels such as superyachts are running at relatively higher Froude Number than other merchant ships. FLUENT with a VOF option was employed to investigate the flow fields around the superyachts having three-typical hull types: U-, V-types and catamaran. Overall performances including free surface flow were compared to figure out hydrodynamic characteristics of superyachy by numerical simulation.