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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Ocean Engineering and Technology
Journal Basic Information
Journal DOI :
Korean Society of Ocean Engineers
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Volume & Issues
Volume 13, Issue 4 - Nov 1999
Volume 13, Issue 3 - Aug 1999
Volume 13, Issue 3B - Aug 1999
Volume 13, Issue 2 - May 1999
Volume 13, Issue 1 - Feb 1999
Volume 13, Issue 4 - 00 1999
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Dissimilar Friction Welding of Engine Exhaustive Valve and High Temperature Creep Prediction and Their Real-Time Evaluation by AE
Lee, Sang-Guk ; Oh, Jung-Hwan ; Oh, Sae-Kyoo ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 1~10
The engine exhaustive valve became essential as the important element. The dissimmilar welding method of exhaustive valve head to stem was asked for manufacturing the engine exhaustive valve, for which the electric resistance are welding has been conventionally used, resulting in poor quality of the welded joint. In this paper, not only the development of optimizing of friction welding with more reliability and more applicability but also the development of in-process real-time weld qudlity(such as strength and toughness) evaluation technique by acoustic emission for friction welding of the engine exhaustive valve(SUH3-SUH35 dissimilar steels) were perfomed. The high temperature(500, 500, 600
C) creep properties prediction of the friction welded joint of SUH3-SUH35 was investigated relating to the initial strain meethod(ISM) as a new approach, resulting in obtaining an experimental equation of creep life prediction.
A Study on the Development of a Three Dimensional Structured Finite Elements Generation Code
Kim, Jin-Whan ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 11~17
A three dimensional finite element generation code has been developed attaching simple blocks. Block can be either a quadrature or a cube depending on the dimension of a subject considered. Finite element serendipity basis functions are employed to map elements between the computational domain and the physical domain. Elements can be generated with wser defined progressive ratio for each block. For blocks to be connected properly, a block should have a consistent numbering scheme for vertices, side nodes, edges and surfaces. In addition the edge information such as the number of elements and the progressive ratio for each direction should also be checked for interfaces to have unique node numbers. Having done so, user can add blocks with little worry about the orientation of blocks, Since the present the present code has been written by a Visual Basic language, it can be developed easily for a user interactive manner under a Windows environment.
An Experimental Study on the Appendage Development of the Incinerating Vessel
Lee, Kwi-Joo ; Kwon, Kyu-Hyok ; Lee, Kwang-Il ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 18~22
One of the problem areas in designing a barge is its resistance and corese stability when it is towed by a tugboat. In this paper, as a part of design of a incinerating vessel, the results of some experimental studies on the effect of various kinds of anti-yawing skegs to the course keeping stability and on the additional resistance caused by them were summarized.
A Study on the Beam Permutation Technique for Frame Type Offshore Structures
Piao Chun-Jun ; Park, Han-Il ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 23~28
For offshore structures, dynamic analysis becomes increasingly important as water depth increases and structural configuration becomes more slender. In the case of dynamic analysis of frame structures, much computer time and high cost are required due to many degrees of freedom, In this paper, a new technique of permutating a segment of frame structure to a beam is developed, which is called here Beam Permutation Technique. The technique is based on definition of stiffness matrix of the beam which is obtained by defining the actions(or forces) required to obtain unit translation or rotation for each degree of freedom wiht al other degree of freedom restrained to zero displacement or rotation. In the technique, an assumption is made that relative positions of nodes in the ends of the segment are not variable, The technique can significantly reduce the degrees of freedom of frame structures and thus the computiong time in dynamic analysis. The natural frequencies and static displacements of the permutated beam are obtained and compared to those of ANSYS with a good agreement.
A Study on the Sheet Metal Forming and the Plastic Deformation Characteristic by Using PAM-STAMP
Kang, Dae-Min ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 29~38
In this paper the forming simulation of circular bulge by using PAM-STAMP has been performed to estimate the sheet metal forning and the plastic deformation characteristic of circular bulge. The uniaxial tension tests adn bulge tests are carried out for studying the forming characteristics of materials, and also Moire experiment are carried out for measuring the radius of curvature of the bulge and the polar compressive thickness strain. In order to compare the simulation results with the experiment and Hills theory, the relationships between redius of curvature adn polar height of the bulge, between hydraulic pressure and polar height, and between polar compressive thickness strain and polar height, are used. According to this study, the results of simulation and Hills theory are good agreement to the experiment. So, the results of simulation by using PAM-STAMP and Hills theory will give engineers good information to assess the formagbility and plastic deformation characteristic of hydraulic circular bulge test.
A Shape Function for the Mesh-Free Method Using Singular Weighting Function and Three-Dimensional Applications
Nam, Yong-Yun ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 39~50
A Study on the Formulation of the Interaction Problem between Upper Structure and the Ground under Consolidation
Lee, Oe-Duck ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 51~61
When a structure is built on the ground under consolidation, the instant corresponding contact pressure which the upper structure exerts on the ground is established. But, as the consolidation of the ground proceeds, the contact pressure is changed because of the flexural rigidity of the upper structure. This varied contact pressure exerts influence on the consolidation behavior of the ground. And, this varied consolidation behavior exerts on the contact pressure in retum. This kind of interaction between the upper struture and the olwer ground under consolidation contimues till all the consolidation process in finished. So this problem cannot be defined as a linear problem. In this paper an approximation method which can analyse this non-linear interaction problem is proposed by the FEM.
Development of the Heat-Resistant Functionally Gradient Material with Metal Substrate
Kim, Bu-Ahn ; Nam, Ki-Woo ; Cho, Mun-Ho ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 62~69
were coated on the substrate surface of ST304 and Al2024 by the plasma spraying method. The adgesion of the films varies depending on the substrates and the laminating method. In the case of STS304, the cracks were observed at thermal shock temperature difference
in the non functionally gradient material(NFGM) and at
in the functionally gradient material(FGM). The film adhesion of the FGM is better than that of the NFGM in ST304. The cumulative AE count of the FGM of STS304 increased continuously at the bending test. But the NFGM of STS304 showed discontinuity of the AE count. The total AE count for the FGM of STS304 decreased as the number of thermal shock increased, and this tendency was evident as the thermal shock temperature difference increased.
A Study on the Deep Hole Drilling for Refractory Metals - STS type BTA drilling for SKD11 high alloy tool steel
Sim, Sung-Bo ; Kim, Chi-Ok ; Kim, Cheol-Kyu ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 70~78
Development of Software System for Plate Forming Simulation
Lee, Joo-Sung ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 79~87
As it is well appreciated plate forming by line heating takes an important role in ship production process. The paper deals with the development of line heating simulator which can produce the resultant deformation due to line heating in a few minute adn with which user can see the result graphically. For the present purpose mechanical modelling is adopted which can explicitly represent the physical resultant of line heating. In developing the present line heating simulator several program modules are integrated by adopting GUI concept such that the simulator can produce resultant deformation with keeping high accuracy. Application example is illustrated for the twisted shape surface which can be frequently seen in ship and offshore structures.
A Study on Optimization of Friction Welding of Automobile Component Materials(SM40C) and Its Real Time Quality Evaluation by AE
Oh, Sae-Kyoo ; Park, Jong-Bae ; Kong, You-Sik ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 88~93
This paper presents the experimental examinations and statistical quantitative analysis of the correlation between the cumulative counts of acoustic emission(AE) during plastic deformation periods of the welding and the tensile strength and other properties of the bar-to-bar welded joints of O.D. 16mm shaft(SM40C) as well as the various welding variables. And this is a new approach which attempts finally to develop real-time quality monitoring system for friction welding. The results lead to a practical possibility of real-time quality control more than 100% joint efficiency showing good weld with no micro structural defects.
A Numerical Analysis of Soil-Pile Systems for Pile Load Tests at a Korean Site
Oh, Se-Boong ; Ahn, Tae-Kyong ; Choi, Yong-Kyu ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 94~104
In order to evaluate the performance of axially of laterally loaded piles experimentaly, pile load tests can be carried out at the site Otherwise stress analyses or subgrade reaction analyses can solve the problem. In this study, stress analysis using FLAC code and subgrade reaction analyses using load transfer curves recommended by API(1993) were performed consistently on the basis of a result of site investigations, and the result of analyses was compared with the measured. As a result the behavior of pile heads was analyzed accurately for both axially and laterally loaded tests. Furthermore axially transferred loads were calculated appropriately for the measured and axial loads were transferred mainly mainly by the frictional resistance rather than by the tip resistance. Consequently, it can be commented that both analysis methods of soil-pile systems are applicable at teh objective site and that solutions may be more accurate if material properties from the site investigation are more explicit.
A Study on Biased Flow Region Using PIV Technique
Na, Jeong-Heon ; Kwon, Sun-Hong ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 105~112
This research is an experimental investigation of the region of the Biased Flow. This experiment was carried out in a circulating water channel, and the results are analyzed by using the PIV technique. The results are presented in velocity vector field, velocity contour and vorticity contour. The results were compared with those of Zdravkovich which were carried out in a wind tunnel. These results will be very useful to verify numerical codes.
Development of Three-Dimensional Numerical Wave Tank by Using the High-Order Spectral/Boundary-Element Method -Waves Generated by a Uniformly Translating Surface Pressure
Kim, Young-Jig ; Lee, Young-Woo ; Hong, Ji-Hoon ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 113~120
In this paper, mathematical formulation of the high-order spectral/boundary-element method is shown. This method is one of the most efficient numerical methods by which the nonlinear gravity waves can be simulated in time-domain. Three-dimensional waves generated by a uniformly translating suriace pressure are calculated and discussed. The obtained results are compared with others results, The comparisons show good agreements.
A Study on Buoyancy Effects in Double-Diffusive Convecting System
Kim, Yang-Hun ; Hyun, Myung-Taek ; Kim, Min-Chan ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 121~129
Double-diffusive convection with verical temperature and concentration gradients in thermally stratified fluids has been investigated experimentally using an electrochemical technique. Cupric sulfuric-sulffuric acid solution confined between two horizontal copper electrodes was used. The change of thermal and solutal buoyance has no influence on the range of voltage for the limiting current. Due to Soret effect, the onset time of natural convection is delayed as the stabilizing thermal buoyancy decreases. Also it is found that the shrinkage of the unstabilizing solutal buoyancy makes the onset of natural convection retard. Multi-layered convective phenomena do not appear because cupric sulfate-sulfuric acid solution is thermally stratified, and heat diffuses faster than cupric sulfate solfate solution.
Development of a Stability System to prevent a Capsize of a Small Fishing Vessel
Cheon, Seung-Hyeon ; Jeon, Ho-Hwan ; Kim, Chang-Hun ; Kim, Si-Yeong ; , ;
Journal of Ocean Engineering and Technology, volume 13, issue 1, 1999, Pages 130~137
The wing-flap stabilizing system attached under the hull bottom of a small fishing vessel to prevent the capsize by controlling the roll motions has been developed. This paper describes the background of the system design together with the experimental results. The effectiveness of the system is proven by the towing tank tests with a 1/4 scale model, showing that the roll motions of the model are much reduced by the active flap control in multidirectional irregular waves forward speeds.