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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Ocean Engineering and Technology
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Journal DOI :
Korean Society of Ocean Engineers
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Volume & Issues
Volume 2, Issue 2 - Dec 1988
Volume 2, Issue 1 - Jun 1988
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A Comparison of Proposed Wave Model with Various Wave Models
Kwon, Sun Hong ;
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 36~45
An Experimental Study on the Dynamic Behavior of a Marine Riser
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 46~58
The experimental investigations on the motion characteristics of a marine riser both in air and water were performed. The static deflections and natural frequencies of the riser in air including the effect of static offset, were obtained from the experiment. These results were compared with those of theoretical prediction by using a simple asymptotic formula. In order to investigate the nonlinear motion characteristics of the riser subject to nonlinear viscous drag and large displacement, the forced oscillation tests both in air and water were performed. In the forced oscillation tests in air, it was found that the transverse motion due to geometrical nonlinearity grows when the amplitude of in-line oscillation exceeds a certain critical value, say, order of 1-2 diameters. The planar motions of the riser in water due to vortex shedding and the geometrical nonlinearity were described. Some of these results were also compared with those of theoretical analysis, which uses a numerical perturbation technique based on the derived linear asymptotic solutions, and found to be generally in good agreement.
An Experimental Analysis on the Motion Response of a Moored Semi-Submersible Platform in Regular Waves
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 59~70
This paper presents the results of motion tests of a moored semi-submersible platform in regular waves. To investigate the effects of mooring system on the motion characteristics, the tests were performed under the various mooring conditions in regular head and beam waves. Two types of mooring system were employed: one is composed of soft springs and the other is of chains. In the case of chains the pretensions were varied to investigate the dynamic effects of mooring forces as well as the motion responses of the semi-submersible. The motion responses and mooring tensions were measured and analyzed by the double amplitude method. The measured motion responses were also compared with the results of calculation from three-dimensional potential theory. Finally, the dynamic behaviors of mooring chains were studied.
Laboratory and In-Situ Study of the Effect of Additives on the Compaction Strength of Snow
Barber. M. ; Brown, R. L. ;
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 71~77
Two Dimensional Numerical Simulation of Liquid Sloshing
Kang, Sin Young ;
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 78~82
Vortex Motion near the Edge of a Semi-Infinite Flat Plate Impulsively Started Transversally
Suh, Y. K. ;
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 83~89
Study on the Behavior of Tubular Member with Partial End Fixity
Cho, K. N. ;
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 90~94
Reliability-Based Optimum Design for Tubular Frame Structures
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 95~105
This paper describes the development of a reliability-based optimum design technique for such three dimensional tubular frames as off shore structures. The objective function is formulated for the structural weight. Constraints that probability of failure for the critical sections does not exceed the allowable probability of failure are set up. In the evaluation of the probability of failure, fatigue as well as buckling and plasticity failure are taken into account and the mean-value first-order second-moment method(MVFOSM) is applied for its calculation. In order to reduce the computing time required for the repeated structural analysis in the optimization process, reanalysis method is also applied. Application to two and three dimensional simple frame structures is performed. The influence of material properties, external forces, allowable failure probabilities and interaction between external forces on the optimum design is investigated.
Analysis of Long Term Stress and Fatigue of Semi-Submersible Drilling Platform
Yu, Byung-Kun ;
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 106~115
Establishment of Ffracture Mechanics Fatigue Life Nnalysis Procedures for Offshore Tubular Joints part I :The Behabvior of Stress Intersity Factors of Weld Toe Surface Flow
Rhee, H. C. ;
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 116~124
Study on Cooling Rates and Mechanical Properties of H.T. Steel Plates in the Underwater Wet arc welding
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 125~134
The feasibility for improving the cooling rates and mechanical properties of wet welding process is experimentally investigated by using new developed underwater wet electrodes and H.T. steel plates. Main results of this experimental study can be summarized as follows; 1) By shielding around weld arc surrounding, the cooling rates resulting from wet welds with developed electrodes on TMCP steel plates can be lower than of non-shielded wet welds. 2)A high quality of mechanical properties of wet welds on TMCP steel plates can be obtained with shielded weld arc surrounding.
Devel opment of Weld Strength Analysis for Dessimilar Metal Friction Welds by Ultrasonic Technique
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 135~149
Friction welding has been shown to have significant economic and technical advantages. However, one of the major concerns in using friction welding is the reliability of the weld quality. No reliable nondestructive test method is available at present for detecting weld quality, particularly in a production environment. Friction welds are formed by the mechanisms of diffusion as well as mechanical interlocking. The severe plastic flow at the interface by forge action of the process brings the subsurfaces so close together that detection of any unbonded area becomes very difficult. This paper presents an attempt to determine the friction weld strength quantitatively using the ultrasonic pulse-echo method. Instead of detecting flaws or cracks at the interface, the new approach calculates the coefficient of reflection based on measured amplitudes of the echoes. It has been finally confirmed that this coefficient could provide the quantitative relationship to the weld quality such as tensile strength, torsional strength, impact value, hardness, etc. So a new nondestructive analysis system of friction weld strength of dissimilar metals using an ultrasonic technique could be well developed.
Influence of Ion-Nitriding on Dynamic Fracture Toughness in Cr Alloy Steels
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 150~162
The dynamic fracture toughness,
,is measured in the heat-treated and ion-nitrided Cr-Mo, Ni-Cr-Mo steel using standard and Precracked Charpy specimens an imstrumented impact machine. The value of
and both the energy of initiate fracture, and the total energy of fracture. Since the
values of the precraked impact specimens are in accord with their theoretical ones, this testing method is sufficently practical. The effect of ion-nitriding are found to be larger than the heat-treaded specimen.
An Experimental Study on the Beack Nourishment Method of Beach
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 163~169
A beach nourishment method can be used as one of the beach. The beach nourishment is affected br a natural condition and an artificial condition; a natural condtion include conditions of bottom slope, diameter of bottom materials and wave, and an artificial condition include deposit position, method, diameter and quantity of the nourishing sand. To obtain and the best diameter of the nourishing sand a two-dimensional hydraulic model test, which simulates the erosional beach, has been accmplished. In this study the protection of the beach erosion can be maximized when the nourishing sand of 0.84mm in diameter, which is about 2.5-3.5 times of the natural bottom materials in diameter.
A Study on the Characteristics of Dynamic Vibration Absorber with Coil Spring and Oil Damper
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 170~175
A study on the dynamic vibration absorber with coil spring and oil damper was carried out both theoretically and experimentally. A main mass is attached to a foundation using coil spring and oil damper. A harmonic motion was applied to the foundation. The effects of the dynamic vibration sbsorber are theoretically summarized in graphs, and tested on a vibratory model for the isolation of actual mechanical vibration. As a result, the first resonance amplitude ratio increased and the second resonance amplitude ratio decreased as the absorber spring constant increased. When the absorber mass increase, the first resonance amplitude ratio is decreased and the second resonace amplitude ratio is increased.
Exergy analysis on the storage performance of the sensible heat storage unit
Journal of Ocean Engineering and Technology, volume 2, issue 1, 1988, Pages 176~182
The exergy analysis on the heat storage performance of the senible heat storage unit which consists of the heat storage material in the concentric annulus and the hot fluid flowing through the inner tube is performed. Heat transfer characteristics which are necessary for the performance of the exergy analysis is obtained from the energy balance equations and the second law of thermodynamics. As the index of heat storage performance, the exergy lossnumber
, and exergy storage ratio from the concepts of the second law of thermodynamics are defined. Results are ovtained for the grometry of the storage unit, the Biot number Bi, ambient temperature
as parameters. From these results the exergy storage ratio can be considered as the efficiency of the hat storage unit and is introduced as a guide to design.