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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 7, Issue 2 - Dec 1993
Volume 7, Issue 1 - Jun 1993
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Fracture Analysis of Weldments Using the J-integral
Shim, Yong-Lae ;
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 3~12
Lagrangian Chaos and Dispersion of Passive Particles on the Ripple Bed
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 13~24
The dispersion in the oscillatory flow generated by gravitational waves above the spatially periodic repples is studied. The steady parts of equations describing the orbit of the passive particle in a two dimensional field are assumed to be simply trigonometric functions. From the view point of nonlinear dynamics, the motion of the particle is chaotic under externally time-periodic perturbations which come from the wave motion. Two cases considered here are; (i) shallow water, and (ii) deep water approximation.
The Evaluation of Fracture Toughness of SMC Composite Material and Carbon/Epoxy Composite Material
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 25~32
In composite materials, the fracture perpendicular to the fiber direction usually shows a non-linear behavior accompannying blunting and plastic deformation around the crack tip. In this study, the fracture thoughness in random short fiber SMC composite material and Carbon/Epoxy composite material is estimated by the A.M.(Area Method) and the G.L.M.(Generalized Locus Method) which can determine a stable total energy release rate(G
) not only in highly elghly elastic material but also in highly non-linear materials.
Numerical Modeling of Short-Time Scale Nonlinear Water Waves Generated by Large Vertical Motions of Non-Wallsided Bodies
Park, Jong-Hwan ; ; Troesch, Armin W. ;
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 33~55
A Research on the Added Resistance Due to Weather at Sea
;Townsin, R. L.;
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 56~61
Standard values in graphic porms are presented for the ratio of added wave resistance to the sun of added wave and wind resistances in head sea for three ship types, tanker, container ship and passenger ship. The effect of ship length on the ratio defined above is investigated for the three ship types. Obique sea added resistance is determined using wave direction reduction factor. The factor is obtained from model test results and cubic spline interpolation technique.
Design and Development of a Remotely Operated Vehcile(ROV)
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 62~72
This paper describes the results of 3 years project on the design and development of a 500 meter class ocean survery ROV model. The design concept and the design procedure are given for each component of the ROV model. The design concept and the design procedure are given for each component of the ROV. Special emphasis is laid on the development of the position control system together with the development of the performance evaluation technique.
Effect of Parametric Excitation on Lateral Vibrations of Long, Slender Marine Structures
Park, Han Il ;
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 73~80
A Study on the Flow Patterns on the Myunggi-Noksan Region due to Reclamation
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 81~91
Studies on the flow pattern due to reclamation in the Myunggi-Nocksan region are carried out based on field observations and numerical experiments. Serial time series measurement of current, temperature and salinity were conducted for 1 tidal period at intervals of 1 hour from surface to bottom on station located at 128.deg. 54' 44" E, 35.deg. 01' 04" N in April and June 1992. Surface current opposite to the subsurface current causes turbulent mixing to make homogeneous salinity pattern in vertical section. Reclamation has little effect on the wave pattern and flow patterns are also nearly similar except on the nearby region of reclamation where flow speed somewhat weakened.
Application of Equivalent Nonlinear Method to Nonlinear Rolling Motoion of Ships
Kwon, Sun-Hong ;
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 92~98
The Use of Hermite Cubic Element for Inviscid Convective Equations
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 99~106
The use of Hermite cubic element, as a possible finite element computation of transport equations containing shocks, has been invesigated. In the present paper the hermite cubic elements are applied to both linear and nonlinear scalar one and two dimensional equations. In the one dimensional problems, numerical results by the hermite cubic element show better than those by the linear element, and the steady state solution by the hermite cubic element yields result with good resolution. This fact proves the superiority of the hermite cubic element in space differencing. In two dimensional case, the results by the hermite cubic element shows a boundary instability, and the use of higher order time differencing method may be necessary for fixing the problem.
Design of the Narrow Beam for Sidescan Sonar
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 107~113
Sidescan sonar uses the fan type beam which has horizontally narrow and vertically somewhat wide beam pattern. To construct such a beam we will use an array of transducers. In case of using single transducer it must have a high frequency to have the fan type beam, but in case of using an array it must have to be high frequency. We are planning to use 30 kHz transducers for our sidescan sonar under development. This paper shows ways of designing a narrow beam for the sidescan sonar system by illustrating various shapes of the beam patterns.
Lock-in Phenomenon in Oscillation of a Circular Cylinder Subject to a Uniform Flow
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 114~123
In is well known that a cyclic Karman vortex street is thrown out periodically from cylinder whose axis is vertical to the bulk flow. When the cylinder is vibrating in the frequency close to that of Karman vortex street, the vortex shedding frequency is locked onto that of cylinder. While there are many experimental studies for this phenomenon compared with analytical studies by numerical calculation, are very limited. In this study, a new algorithm for moving boundary is proposed and a simulator is develoed, which can deal with this phenomenon with experimental studies.
Effect of Anisotropy on Fatigue Crack Propagation Rate and Arrest Behavior with 2024-T3 Alumunum Alloy
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 124~132
In order to examine the effect of anisotropy and stress ratio on fatigue crack propagation rate and opening-closing behavior and also arrest behavior by single tension peak overload, the fatigue tests of constant amplitude atress and single tension peak overload adding to cycle of constant amplitude were carried out in stress ratio of -0.4, -0.2, and 0.4 with materials of T-L and L-T directions in 2024-T3 aluminum alloy plate. Crack opening-closing begavior were measured by the compliance method using COD gage and strain gage. In case of the crack opening-closing behavior was measured by strain gage, the effect of stress ratio is unchangeable. But in the case of COD gage, that is remarkably decreased. Fictitious effective stress intensity factor(U sub(f)) and effective stress intensity factor ratio(U) in L-T direction was higher than those in T-L direction and also threshold arrest overload ratio incrased as stress ratio decreased and that of T-L direction was higher than that in L-T direction.
Development of a Dynamic Response Analysis Method of Tension Leg Platforms in Waves
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 133~146
A numerical procedure is described for predicting the motion and structural responses of tension leg platforms (TLPs) in waves. The developed numerical approach is based on combination of a three dimensional source distribution method and the dynamic response analysis method, in which the superstructure of TLPs is assumed flexible instead of the rigid body assumption used in usual two-step analysis method, proposed by Yoshida et. al. .The hydrodynamic interactions among TLP members, such as columms and pontoons, are included in the motion and structural analyses. Numerical results are compared with the experimental and numerical ones, which are obtained in the literature, of the motion and structural responses of a TLP in waves. The results of comparison confirmed the validity of the proposed approach.
Effect of Stress Waveform on Corrosion Fatigue Crack Propagation in High Strength Steels-the Role of Anodic Dissolution Mechanism
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 147~155
The effect of stress waveforms on corrosin fatigue and the role of dissolution mechanism in 3NilCr steel and 20Ni maraging steel have been investigated in aerated 3% NaCl solution and synthetic seawater under sinusoidal, triangular, square, positive sawtooth, negative sawtooth, and trapezoidal stress waveforms with open circuit at frequency of 1Hz and stress ratio of 0.1. The crack growth rates under square waveform were substantially lower than under sinusoidal and triangular waveforms, but the crack growth rates under sinusoidal waveform were slightly higher under triangular waveform. For a given frequency the growth rates under the positive sawtooth waveform are higher than those under the negative sawtooth waveform. The fatigue crack growth rates of most specimens were in good agreement with the values calculated by the model based on the dissoultion mechanism.
A Study on the Numerical Model for Predicting Shoreline Changes
Journal of Ocean Engineering and Technology, volume 7, issue 1, 1993, Pages 156~161
Structures built in the coastal area often cause unexpectedly severe shoreline change on the adjacent beaches. Therefore, beach evolution is one of the most important problem in the coastal engineering. Beach evolution in the coastal area consisted of wave transform model and sediment transport model. Ebersoale's elliptic mild slope equation which considered the effect of combind wave refraction and perline and Dean's one line theory for the sediment transport model were used in this study. Kwangan beach was selected as study area and field observations were done. Numerical simulation for beach evolution in the Kwangan beach was performed and shoreline change predictions were suggested as results.