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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Marine Engineering
Journal Basic Information
Journal DOI :
Korean Society of Marine Engineers
Editor in Chief :
Volume & Issues
Volume 31, Issue 8 - Nov 2007
Volume 31, Issue 7 - Nov 2007
Volume 31, Issue 6 - Sep 2007
Volume 31, Issue 5 - Jul 2007
Volume 31, Issue 4 - May 2007
Volume 31, Issue 3 - May 2007
Volume 31, Issue 2 - Mar 2007
Volume 31, Issue 1 - Jan 2007
Selecting the target year
The Development of Operating Manual for Safe Navigation of LNGC
Kwon, Yeong-Gwal ; Park, Soon-Chun ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 647~651
DOI : 10.5916/jkosme.2007.31.6.647
Review of electric propulsion system in LNG Carrier.
Moon, Yang-Kyeong ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 652~664
DOI : 10.5916/jkosme.2007.31.6.652
A Study on the Flow Characteristics of Desktop Personal Computer by In-Out Fan
Lee, Haeng-Nam ; Park, Gil-Moon ; Jung, Han-Byul ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 665~671
DOI : 10.5916/jkosme.2007.31.6.665
The purpose of this study is to find out a flow characteristics required by the design of a computer case and to provide information about the preliminary data of cooling efficiency of CPU and a flow inside of a case. We examined a flow characteristic-suction a tracing particle occurred from a surge tand installed at an inlet into a computer case and moving it to a exit duct-experimentally by using PIV. The experimental device was consists of a fan inflowing and discharging the air into the computer case and a slot installed with a CPU cooling ran add-on, and analyzed the data of Re-stress distribution, velocity distribution, and kinetic energy distribution. This research will make a great contribution to improvement of the efficiency and performance of notebook, workstation, server, and all the design of electronic devices using large scale integrated(LSI) as well as usual computers.
An Experimental Study on the Characteristics of Liquid Atomization in a Rotating Disk Atomizer
Lim, Jong-Han ; Yoon, Jun-Kyu ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 672~680
DOI : 10.5916/jkosme.2007.31.6.672
Apparatus of rotating disk and cup are widely used spray paintings and industrial boilers. This study was conducted experimentally to investigate the characteristics of liquid atomization in a rotating disk atomizer by means of viscous liquid mixed water and glycerin. The Purpose of this study are to observe breakup mechanism according to the variation of supplied flow rate
and rotating speed
, and to investigate three kinds of breakup Pattern such as drop ligament and film formation by comparing the transition flow rate. ligament number and ligament length to those of Tanasawa and Matsumoto's empirical formula. The results are as follows ; The higher it makes use of viscous liquid. the better it get the characteristics of breakup mechanism. Also When I compared practical value with experiential value at similar test conditions. it was shown similar tendency though were a little variation.
Numerical Analysis of Turbulent Flows in the Scroll Volute of Centrifugal Compressor
Kwag, Seung-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 681~686
DOI : 10.5916/jkosme.2007.31.6.681
The flow analysis was made by applying the turbulent models in the scroll volume of centrifugal compressor. The
, Spalart-Allmaras and reynolds stress models are used in which the hybrid grid is applied for the simulation. The velocity vector the Pressure contour. the change of residual along the iteration number. and the dynamic head are simulated by solving the Navier-Stokes equations for the comparison of four example cases.
CFD Analysis of Pressure Pulsation and Internal Flow for a Positive Displacement Hydraulic Turbine
Choi, Young-Do ; Kim, You-Taek ; Lee, Young-Ho ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 687~693
DOI : 10.5916/jkosme.2007.31.6.687
It has been known that one of the main obstacles of improving the performance of positive displacement hydraulic turbine is pressure pulsation which occurs at the regions upstream and downstream of the turbine. In order to suppress the pressure pulsation. occurrence reason of the pressure pulsation should be understood in detail Therefore. this study aims to establish a CFD analysis method by which the phenomena of unsteady pressure pulsation can be examined with high accuracy. Internal flow field of the turbine is modeled simply to generalize the relation between the pressure pulsation and internal flow. The results show that the Present CFD method adopting unsteady calculation can be applied successfully to the analysis of the Phenomena of Pressure Pulsation. Occurrence of the Pressure pulsation is due to the difference of the rotational speed of turbine rotors When driving rotor rotates by uniform speed and fellowing rotor rotates by variable speed, very large Pressure pulsation occurs within the turbine periodically.
A Study on the Effect of Surfactant on the Freezing of Aqueous Solution
Kim, Myoung-Jun ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 694~698
DOI : 10.5916/jkosme.2007.31.6.694
This present study has dealt with the effect of surfactant on the freezing of aqueous solution Sodium chloride aqueous solution was used to measure the effect of surfactant and the main parameters of this experiment were temperature of bath, revolution of stirrer. and the radial velocity of NaCl solution. The acquired main conclusions are as follows; 1) the lower super-cooling temperature make hardly to attach the ice on beaker, 2) the size of ice become smaller to add the surfactant, 3) the ice packing factor increase with increasing of stirrer revolution
Cooling Heat Transfer Characteristics of CO
in Helical Coil Type Gas Coolers
Son, Chang-Hyo ; Jeon, Min-Ju ; Oh, Hoo-Kyu ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 699~706
DOI : 10.5916/jkosme.2007.31.6.699
The cooling heat transfer coefficient and pressure drop of
(R-744) in helical coil copper tubes were investigated experimentally The main components of the refrigerant loop are a receiver, a variable-speed pump, a mass flow meter. a pre-heater and a inclined helical coil type gas cooler (test section). The test section consists of a smooth copper tube of 2.45 and 4.55mm inner diameter The refrigerant mass fluxes were varied from 200 to
and the inlet pressures of 9as cooler were 7.5 to 10.0 [MPa]. The heat transfer coefficients of
in helical coil tubes increase with the increase of mass flux and gas cooling pressure of
. The pressure drop of
in the gas cooler shows a relatively food agreement with those Predicted by Ito's correlation developed for single-phase in helical coil tubes. Though a few correlation available with the data. the local heat transfer coefficient of
agrees well with those presented by Pitla et al. among the predictions. However at the region near pseudo-critical temperature. the experiment data indicate higher values than the Pitla et al. correlation.
Heat Transfer Characteristics of Inclined Helical Coil Type Heat Exchanger
Son, Chang-Hyo ; Jeon, Min-Ju ; Jang, Seong-Il ; Oh, Hoo-Kyu ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 707~714
DOI : 10.5916/jkosme.2007.31.6.707
The heat transfer coefficient and Pressure drop during gas cooling process of
(R-744) in inclined helical coil copper tubes were investigated experimentally. The main components of the refrigerant loop are a receiver. a variable-speed pump. a mass flow meter, a pre-heater and a inclined helical coil type gas cooler (test section). The test section consists of a smooth copper tube of 2.45mm inner diameter. The refrigerant mass fluxes were varied from 200 to
and the inlet Pressures of gas cooler were 7.5 to 10.0 [MPa]. The heat transfer coefficients of
in the inclined helical coil tubes increases with the increase of mass flux and gas cooling pressure of
. The pressure drop of
in the gas cooler shows a relatively good agreement with those Predicted by Ito's correlation developed for single-phase in a helical coil tube. The local heat transfer coefficient of
agrees well with the correlation by Pitla et al. However, at the region near pseudo-critical temperature. the experiments indicate higher values than the Pitla et al. correlation. Therefore. various experiments in the inclined helical coil tubes have to be conducted and it is necessary to develop the reliable and accurate prediction determining the heat transfer and pressure drop of
in the inclined helical coil tubes.
Experimental study for the pressure drop of R-22 and R-4O7C during the condensation in the micro-fin tubes
Roh, Geon-Sang ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 715~722
DOI : 10.5916/jkosme.2007.31.6.715
Experiments were conducted for the investigation of pressure drop inside horizontal micro-fin tubes during the condensation of R-22 and ternary refrigerant. R-407C(HFC-32/125/134a 23/25/62 wt%) as a substitute of R-22. The condenser is a double-tube and counterflow type heat exchanger which is consisted with micro-fin tubes having 60 fins with a length of 4000mm, outer diameter of 9.53mm and fin height of 0.2mm. The mass velocity varied from 102.1 to
and inlet quality was fixed as 1.0. From the experimental results. the pressure drop for R-407C was considerably higher than that for R-22. The value of PF(penalty factor) for both of refrigerants was not bigger than the ratio of micro-fin tube area to smooth tube area. Based on the experimental data. correlation was Proposed for the prediction of frictional pressure drop during the condensation of R-22 and R-407C inside horizontal micro-fin tubes.
Performance Analysis for CO
System with Sub-cooling loop
Kim, Jin-Man ; Ko, Sung-Gyu ; Kim, Moo-Geun ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 723~728
DOI : 10.5916/jkosme.2007.31.6.723
In order to evaluate the performance of carbon dioxide cycle with a sub-cooling loop. a simulation system was developed to predict the steady state of
trans-critical cycle. Mathematical models are derived to describe the relationships between the system's coefficient of performance and other operating parameters The mathematical models are based entirely on the basic mass and energy conservation law and thermodynamic and transport properties of carbon dioxide A parametric study has been conducted in order to investigate the effect of sub-cooling loop and various operating conditions on the cycle performance. An optimal mass fraction of a refrigerant flowing through sub-cooling cycle existed for the given evaporating temperature, high pressure and air inlet temperature through gas cooler.
A Study on the Effect of Preheating in Cold AC Arc Welding Process of the Cast Iron
Kim, Jin-Gyeong ; Kim, Young-Sik ; Yu, Dae-Won ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 729~735
DOI : 10.5916/jkosme.2007.31.6.729
AC cold arc welding process with AWS E Ni-CI and NiFe-CI is sometimes used to repair damaged cast iron parts in diesel engine room. But if some difference in hardness on welding zones, repaired parts would be cracked in a short. To overcome this default. this study is performed on varying preheating temperature of welding parts, selecting welding rod etc. Experimental results showed that difference in hardness on welding zones at
was less than
and less low current than high current. From this study we could conclude that repair welding at
preheating and low current as possible as welding in damaged cast iron parts was a little difference in hardness on welding zones.
Weldability of Low Carbon Steel with Al Coating Condition by Nd:YAG Laser
Kim, Jong-Do ; Lee, Jung-Han ; Kim, Sook-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 736~743
DOI : 10.5916/jkosme.2007.31.6.736
Laser welding has the advantage of high welding speed and Provides low heat distortion Thus laser welding is a very attractive process for joining thin steel sheet and surface treated steel sheet. And the major item in market for surface treated steel sheet is zinc coated steel. However. the laser welding of zinc coated steel is very difficult because of its low boiling point. Compared with zinc, on the other hand, aluminum has a high boiling point. Thus, laser weldability of aluminized steel is better than that of zinc coated steel. Moreover aluminized steel sheet is a material with excellent heat resistance, thermal reflection and corrosion resistance. The results of laser weldability of the aluminized steel for the full penetration welding will be described in this paper We focused on the investigation of the phenomenons caused by coating condition and behavior of aluminum in weld.
Effect of Welding method and Welding Material to Corrosion Property of Repair Weld Zone for Exhaust Valve in 5% H
Kim, Jin-Gyeong ; Cho, Hwang-Rae ; Lee, Myung-Hoon ; Kim, Yun-Hae ; Moon, Kyung-Man ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 744~752
DOI : 10.5916/jkosme.2007.31.6.744
Recently a fuel oil of the diesel engine in the ship is being changed with low quality as the oil price is higher more and more. Therefore the wear and corrosion in all parts of the engine like cylinder liner ring groove of piston crown, spindle and seat ring of exhaust valve are increased with using of heavy oil of low quality In particular the degree of wear and corrosion in between valve spindle and seat ring are more serious compared to the other parts of the engine due to operating in severe environment such as the high temperature of exhaust gas and repeating impact. Thus the repair weld to the valve spindle and seat ring is a unique method to prolong the life of the exhaust valve in an economical point of view In this study. corrosion property of both weld metal zone and base metal was investigated with some electrochemical methods such as measurement of corrosion potential, cathodic and anodic polarization curves, cyclic voltammogram and polarization resistance etc. in 5%
solution. in the case of being welded with some welding methods and welding materials to the exhaust valve specimen as the base metal. In all cases. the values of hardness of the weld metal zone were more high than that of the base metal. And their corrosion resistance were also superior to the base metal. The weld metal of A2F(AC SMAW: 2 pass welding with foreign electrode) showed a relatively good results to the corrosion resistance as well as the hardness compared to the ether welding methods and welding materials. Moreover it indicated that hardness of the weld metal by the domestic electrode was considerably high compared to that of the foreign electrode.
A Study on the Optimum Shape of Basalt Liner for Inner Wall Protection of Ball Mill
Wang, Jee-Seok ; Kim, Jong-Do ; Yoon, Hee-Jong ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 753~760
DOI : 10.5916/jkosme.2007.31.6.753
For protection of the cylinder wall of the ball mill for grinding raw ore. the inner side of the cylinder is covered with rubber liner. The rubber is easily worn down because the rubber relatively soft compared with raw ore. So the rubber liner in the ball mill cylinder must be replaced almost every year and the cost for replacing rubber liner formidable. In this paper, for reducing or excluding the cost of replacing rubber liner the basalt liner is designed. The basalt materials are generally harder than raw ore and the basalt liner in the ball mill does not wear down and so it can be used almost permanently. The concave surfaces are made on the liner of the ball mill and the liner in the cylinder wall plays also the role of raising the steel balls mixed in the raw ore. The section profiles of the concave surface have an important effect on the performance of the ball mill. The deep concave grooves raise the steel balls to high levels and give the large potential energy to the steel balls impacting to the raw ore. But if the concave grooves are too deep. the steel balls raised too high by the concave grooves fly along the parabolic path and reach to the other side of cylinder wall and so the steel balls do not play the roles of grinding the raw ore. The forces acting to a steel ball in a concave groove of the cylinder liner are also analyzed in this paper. The formulas calculating the height and the impact point of the steel ball are introduced and presented. Based to these formulas, the optimum section profiles of the basalt liner are presented.
Novel Long-period Fiber Grating devices for Monitoring the Deformation of Ship Hull
Sohn, Kyung-Rak ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 761~767
DOI : 10.5916/jkosme.2007.31.6.761
We have developed novel optical-fiber sensors based on strain-induced long-period fiber gratings for monitoring the deformation of a hull. They have no external pressure for sustaining the mechanical formed gratings. The pressure, which provides a force to form the periodic grating along the single mode fiber, was realized by the bonding strength of a photopolymer. To reduce the polarization dependency of the sensors caused by the asymmetry structure of gratings, a Faraday Rotator Mirror (FRM) was utilized in this experiment. We have realized the polarization-insensitive function of the proposed sensors. The change of an external strain are measured by an optical spectrum analyzer. When the external stain increases. the attenuation at the resonant wavelength decreases and the loss peak was slightly shifted to the shorter wavelength.
A Study on the Analysis of Axial Vibration of Flexible Shafting System for Propulsion and Lift in Air Cushion Vehicle
Son, Seon-Tae ; Kil, Byung-Lea ; Kim, Jung-Ryul ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 768~776
DOI : 10.5916/jkosme.2007.31.6.768
In this study, axial vibration analysis has been conducted on a propulsion and lift shafting system for an air cushion vehicle using ANSYS code. The shafting system is totally flexible multi-elements system including wood composite material of air propeller. aluminum alloy of lift fan and thin walled shaft with flexible coupling. The analysis calculated the axial natural frequencies and mode shapes of the shafting system taking into account an equivalent mass-elastic model for shafting system as well as the three-dimensional models for propeller blade and fan impeller. Such a flexible shafting system has very intricate vibrating characteristics and especially, axial natural frequencies of flexible components such as propeller blade and impeller of lift fan can be lower to the extent that causes a resonance in the range of operating revolution. The results for axial vibration analysis are presented and compared with the results of axial vibration test for lift fan conducted during Sea Trial.
A Highly Integrated HBT Downconverter MMIC for Application to One-chip RF tranceiver solution
Yun, Young ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 777~783
DOI : 10.5916/jkosme.2007.31.6.777
In this work, a highly integrated downconverter MMIC employing HBT(heterojunction bipolar transistor) was developed for application to one chip tranceiver solution of Ku-band commercial wireless communication system. The downconverter MMIC (monolithic microwave integrated circuit) includes mixer filter. amplifier and input/output matching circuit. Especially, spiral inductor structures employing SiN film were used for a suppression of LO and its second harmonic leakage signals. Concretely, they were properly designed so that the self-resonance frequency was accurately tuned to LO and its second harmonic frequency, and they were integrated on the downconverter MMIC.
Development of a Semi-Autonomous Underwater Vehicle
Kim, Kyeong-Ki ; You, Sam-Sang ; Seo, Ju-No ; Choi, Hyeung-Sik ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 784~790
DOI : 10.5916/jkosme.2007.31.6.784
This paper is mainly concerned with the development of the semi-autonomous underwater vehicle (SAUV). Underwater vehicles are affected by external disturbances due to the sea conditions such as currents and waves when it is performing various missions In this paper we present a design scheme of the SAUV system with mathematical models. Also. we present a control system including motion control of motors and main controller and a communication based on CAN method for interrelated control between the controllers and actuators.
A Study on the Properties of Loop System Configured by Coupling 2 PI Controllers for Fault Diagnosis
Choi, Soon-Man ; Doo, Hyun-Wook ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 791~796
DOI : 10.5916/jkosme.2007.31.6.791
When 2 sets of PID controllers are coupled directly each other to configure a closed control loop on behalf of coupling a controller and a plant. the behaviors or this exclusive loop system are expected to be unique in inherent system responses. If its properties be disclosed and generalized well in advance, it is possible for us to use the results for the purpose of fault detection and performance monitoring between control stations from the stage of system design. particularly in such cases as cascade control systems. In this paper. general properties of the proposed system are analyzed firstly to check whether it is controllable and how its steady responses would be. To simplify calculation, the analysis has been performed based on the transfer equation derived from a modelled case which consists of 2 PI controllers and signal converters between them. including time delay element and first-lag element to consider the situation of signal transmission. The results acquired from simulation are suggested to show how it works actually.
A Study about Choice of Industrial Mixer's Impeller Type for PIV and CFD
Kim, Dong-Kyun ; Kim, Jeong-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 797~803
DOI : 10.5916/jkosme.2007.31.6.797
The Industrial Mixers are used in various industrial fields where they are necessary to intimately mix two reactants in a short Period of time. However. despite their widespread use, complex unsteady flow characteristics of industrial mixers are not systematically investigated. The present study aims for clarify unsteady flow characteristics Induced by various impellers in a tank. Impellers are pitched blade turbine(PBT) types, Screw type and Rushton turbine type. In this study choice of the industrial mixer's impeller type using PIV and CFD method. The rotating speed of impellers are fixed by 100RPM.
A Study on the Designation of Standard Solid Test Particles for Marine Centrifugal Purifier Performance Test
Jeong, Sang-Hu ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 804~809
DOI : 10.5916/jkosme.2007.31.6.804
In order to provide reliability. reproducibility. objectivity of solid particle separation performance test on marine centrifugal purifier, an investigation had been done on solid test dusts. test standards and designation of a definite standard test dust In test specifications or standards. ISO 121031-1 A2 test dust is the best test particle to meet commercial and military fuel oil and lube oil requirements on marine standards.
Plan for Vitalization of Busan New Port by Activating Ship-Repair Industry
Oh, Jin-Seok ; Sin, Yong-Jon ; Lee, Sang-Deuk ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 6, 2007, Pages 810~817
DOI : 10.5916/jkosme.2007.31.6.810
Every ports is making great efforts to get competitiveness. It is progressing for the research on port model of new concept that connect port-related business to be developed from base running simple cargo processing to universal port that has economical efficiency and competitiveness, This research shows development way of Busan port that connect ship-repair industry which is port-related business. Development way is especially handled link between port and ship-repair industry field activation of high value-added ship as LNG etc.