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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 2, Issue 4 - Dec 2010
Volume 2, Issue 3 - Sep 2010
Volume 2, Issue 2 - Jun 2010
Volume 2, Issue 1 - Mar 2010
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A Survey: application of geometric modeling techniques to ship modeling and design
Ko, Kwang-Hee ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 4, 2010, Pages 177~184
DOI : 10.3744/JNAOE.2010.2.4.177
In this study, geometric modeling techniques and their application to ship modeling and design are presented. Traditionally the hull shape is defined by using curves called the lines and various necessary computations are performed based on the discrete points obtained from the lines. However, some applications find difficulty in using the lines such as seakeeping analysis, which requires the computation of wetted part that is changing dynamically over time. To overcome such a problem and increase accuracy and efficiency in computation, two essential geometric modeling techniques, surface modeling and surface-to-surface intersection, are introduced and their application to ship modeling and analysis including hydrostatic computation, slamming and seakeeping analyses is presented.
Cavitation studies on axi-symmetric underwater body with pumpjet propulsor in cavitation tunnel
Suryanarayana, Ch. ; Satyanarayana, B. ; Ramji, K. ; Rao, M. Nageswara ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 4, 2010, Pages 185~194
DOI : 10.3744/JNAOE.2010.2.4.185
A pumpjet propulsor (PJP) was designed for an underwater body (UWB) with axi-symmetric configuration. Its performance was predicted through CFD study and models were manufactured. The propulsor design was evaluated for its propulsion characteristics through model tests conducted in a Wind Tunnel (WT). In the concluding part of the study, evaluation of the cavitation performance of the pumpjet was undertaken in a cavitation tunnel (CT). In order to assess the cavitation free operation speeds and depths of the body, cavitation tests of the PJP were carried out in behind condition to determine the inception cavitation numbers for rotor, stator and cowl. The model test results obtained were corrected for full scale Reynolds number and subsequently analyzed for cavitation inception speeds at different operating depths. From model tests it was also found that the cavitation inception of the rotor takes place on the tip face side at higher advance ratios and cavitation shifts towards the suction side as the RPS increases whereas the stator and cowl are free from cavitation.
An interpolation method of b-spline surface for hull form design
Jung, Hyung-Bae ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 4, 2010, Pages 195~199
DOI : 10.3744/JNAOE.2010.2.4.195
This paper addresses the problem of B-spline surface interpolation of scattered points for a hull form design, which are not arbitrarily scattered, but can be arranged in a series of contours permitting variable number of points in the contours. A new approach that allows different parameter value for each point on the same contour has been adopted. The usefulness and quality of the interpolation has been demonstrated with some experimental results.
Comparison of hot spot stress evaluation methods for welded structures
Seo, Jung-Kwan ; Kim, Myung-Hyun ; Shin, Sang-Beom ; Han, Myung-Soo ; Park, June-Soo ; Mahendr, Mahen ; Lee, Jae-Myung ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 4, 2010, Pages 200~210
DOI : 10.3744/JNAOE.2010.2.4.200
In this paper, different evaluation methods of Hot Spot Stresses (HSS) have been applied to four different welded structure details in order to compare them and to illustrate their differences. The HSSs at failure-critical locations were calculated by means of a series of finite element analyses. There was good overall agreement between calculated and experimentally determined HSS on the critical locations. While different methods and procedures exist for the computation of the structural hot-spot stress at welded joints, the recommendations within the International Institute of Welding (IIW) guideline concerning the 'Hot Spot Stress' approach were found to give good reference stress approximations for fatigue-loaded welded joints. This paper recommends and suggests an appropriate finite element modeling and hot spot stress evaluation technique based on round-robin stress analyses and experimental results of several welded structure details.
Performance optimization of marine propellers
Lee, Chang-Sup ; Choi, Young-Dal ; Ahn, Byoung-Kwon ; Shin, Myoung-Sup ; Jang, Hyun-Gil ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 4, 2010, Pages 211~216
DOI : 10.3744/JNAOE.2010.2.4.211
Recently a Wide Chord Tip (WCT) propeller has been developed and applied to a commercial ship by STX Offshore & Shipbuilding. It is reported that the WCT propeller significantly reduces pressure fluctuations and also ship's noise and vibration. On the sea trial, vibration magnitude in the accommodations at NCR was measured at 0.9mm/sec which is only 10% of international allowable magnitude of vibration (9mm/sec). In this paper, a design method for increasing performance of the marine propellers including the WCT propeller is suggested. It is described to maximize the performance of the propeller by adjusting expanded areas of the propeller blade. Results show that efficiency can be increased up to over 2% through the suggested design method.
Structural design optimization of racing motor boat based on nonlinear finite element analysis
Song, Ha-Cheol ; Kim, Tae-Jun ; Jang, Chang-Doo ;
International Journal of Naval Architecture and Ocean Engineering, volume 2, issue 4, 2010, Pages 217~222
DOI : 10.3744/JNAOE.2010.2.4.217
Since 1980's, optimum design techniques for ship structural design have been developed to the preliminary design which aims at minimum weight or minimum cost design of mid-ship section based on analytic structural analysis. But the optimum structural design researches about the application for the detail design of local structure based on FEA have been still insufficient. This paper presents optimization technique for the detail design of a racing motor boat. To improve the performance and reduce the damage of a real existing racing boat, direct structural analyses; static and non-linear transient dynamic analyses, were carried out to check the constraints of minimum weight design. As a result, it is shown that the optimum structural design of a racing boat has to be focused on reducing impulse response from pitching motion than static response because the dynamic effect is more dominant. Optimum design algorithm based on nonlinear finite element analysis for a racing motor boat was developed and coded to ANSYS, and its applicability for actual structural design was verifed.