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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Marine Engineering
Journal Basic Information
Journal DOI :
Korean Society of Marine Engineers
Editor in Chief :
Volume & Issues
Volume 18, Issue 5 - Oct 1994
Volume 18, Issue 4 - Aug 1994
Volume 18, Issue 3 - Aug 1994
Volume 18, Issue 2 - Apr 1994
Volume 18, Issue 1 - Feb 1994
Selecting the target year
A Study on the Temperature Distribution of Materials Due to Electric Upsetting Forming
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 1~9
The transient temperature distribution of materials during upsetting forming is very important for quality of upsetted workpiece and understanding the thermal characteristics of upsetting is essential for optimum control of the forming. In this paper it is shown that the governing equation of heat transfer for axi-symetric body can be derived from minimizing a functional, and from this theory, formulation of analysis by the finite element method is presented. It is also shown that the thermal contact resistance between two bodies can be represented by equivalent coefficient of heat conductivity. Some examples of calsulated transient temperature distributions by the computer program diveloped from the theory presented in this paper are given in graphic forms. It is proven that the results calculations are very plausible.
The Latent Heat of Phase Transformation of the Carbon Steel and the Calculation of Cooling Curves Including the Latent Heat in Quenching
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 10~16
This study aimed at measuring the latent heat of phase transformation of S45C carbon steel in quenching and at conducting the analytical researches into the calculation of cooling curves including the latent heat. The temperature of phase transformation of steel and its latent heat are dependant upon the cooling rates at the temperature of A1 phase transformation point. The effect of the latent heat of phase transformation is especially manifest at the cooling curve of center of specimens. The higher the cooling rates became, the lower fell the temperature region of phase transformation. In the figures of cooling rates, the phenomena of cooling rate dropping into zero was caused by the latent heat of phase transformation.
A Study on the Turbulent Flow in Concentric Annuli with Both Rough Walls
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 17~25
Fully developed turbulent flow through three concentric annuli with both the rough inner and outer walls was experimentally investigated for a Reynolds number range Re = 15, 000 - 85, 000. Measurements were carried out for the pressure drop, the positions of zero shear stress and maximum velocity, and the velocity distributions in annuli of radius ratios,
=0.26, 0.4 and 0.56, respectively. The experimental results showed that the positions of zero shear stress and maximum velocity were only weakly dependent on the Reynolds number.
A Study on the Subcooled Boiling Heat Transfer in a Horizontal Tube
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 26~33
A new reliable method to prediet the axial vapor fraction distribution from the measured probability density of the liquid bulk temperature is suggested in this paper. And also the actual quality of the subcooled boiling flow is easily calculated from the liquid bulk temperature. When the heat generating rate is reached to the CHF value, the sharp wall temperature increasing by the wall temperature fluctuation is occurred under the CHF condition. This paper presents the simple wall temperature fluctuation model of transition boiling by the repeating process of overheating and quenching, when the coalescent bubble passes slowly near the wall. Experiments for the subcooled R-113 flow are carride-out in the range of(0.9399~4.461)
hr mass velocity and 10~3
intel subcooling condition.
A Study on the Improvement of PIV Performance
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 34~42
The present study is aimed to improve the PIV performance by suggesting a two-frame particle identification technique and by introducing estimation method of wall pressure distribution from the velocity data. Adopted image processing system consists of one commercial image board slit into a personal computer, 2-D sheet light generator, flow picture recording apparatus and related particle identification software. A revised particle tracking method essential to PIV performance is obtained by particle centroid correlation pairing (CCP) and its effectiveness is ascertained by comparison with multi-frame identification.
A Study on the Performance Characteristics of the 2-D Centrifugal Turbomachinery
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 43~51
The design technique of turbo pumps has been developed due to an increasing demand from related industrial fields. But infant stage of turbomachinery in the domestic industry needs more fundamental design method. Among various types of pumps, centrifugal pump was chosen because of its wide industrial application. It is difficult to decide the correct specification of centrifugal impeller, because of its complex flow analysis at the inlet, passage and outlet. This study is limited on the impeller blade design and its related performance analysis.
Fracture Behavior of Advanced Composite Material
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 52~62
The Effect of Compression Molding with Inclined Force for Fiber - Reinforced Thermoplastics
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 63~67
A main property for fiber reinforced thermoplastic composite material in compression molding is the flow of fibers. This flow is so effective a long direction of acting force that this study examined for the inclined angel of 30
. Below the near softing temperature of plastic, the fiber has been fractured at a point so that the fiber strength is smaller then the local hydrostatic stress in the mold. It has been found that the position of fracture is changing accrding to the incling angle. In case of the above softing temperature, the larger the inclined is, the farther the flow of fiber move. Also the plastic flow has been progresed with the cicular are type.
A Study on the Bead Stability in High Speed TIG Welding
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 68~77
TIG welding process is applied for the active metal such as aluminum and titanium, also sometimes for overlay welding of superalloy. However the welding speed to be applied is very low because of the unstable bead formed in the region of high current and high welding speed. The present study was carried out to examine the basic phenomena of high speed TIG melt run welding by the 2% Th - W electrode(dia.3.2mm) of various tip shapes.
A Study on the Characteristics of the Synchroneous Data Transmission by the Phase Band Limit of AC Power Wave to Avoid the Periodic Noises in the Data Communication System of Distribution Line Carrier Method
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 78~84
The location of periodic noises in phase of AC power wave reveals to be specific according to the noise kinds which can be generally classified into modulation and baseband types in DLC. The former noise type has constant noise phase which is originated from switching mode power supplies and the latter normally caused from thyristor circuit of low switching frequency is compared to be more dispersive than the other.
Fuzzy Defects Diagnosis of Rolling Element Bearings
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 85~93
A new diagnosis method is developed in this paper, in which the fuzzy set theory is introduced to diagnose the defects of rolling element bearings. The selection of membership function and the fuzzy operation model are discussed in detail here. The system is successfully used for various defects diagnosis of rolling element bearings.
Evaluation of the Influence of a Convective Term Caused by Various Finite Difference Schemes in General Curvature Coordinate
Journal of the Korean Society of Marine Engineering, volume 18, issue 3, 1994, Pages 94~101
To develope the new simulator for the analysis of fluid flow information, the influence of various convective difference schemes were evaluated. General curvilinear coordinate system with nonorthogonal grids was adopted for the successful analysis of various complex geometries. Computation results show that if we can not obtain full grid numbers within available computational environment, we need to use higher order finite difference schemes to keep the prediction accuracy.