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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 33, Issue 8 - Nov 2009
Volume 33, Issue 7 - Nov 2009
Volume 33, Issue 6 - Sep 2009
Volume 33, Issue 5 - Jul 2009
Volume 33, Issue 4 - May 2009
Volume 33, Issue 3 - May 2009
Volume 33, Issue 2 - Mar 2009
Volume 33, Issue 1 - Jan 2009
Selecting the target year
Characteristics and Applications of Plate Type Heat Exchanger
Park, Jae-Hong ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 801~811
DOI : 10.5916/jkosme.2009.33.6.801
Heat Exchanger for Cargo Handling System in LNGC
Hong, Sung-Hee ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 812~821
DOI : 10.5916/jkosme.2009.33.6.812
A Study on the Characteristics of Differential Pressure According to Main Engine Load and a Process of Supply Air For Combustion
Koo, Keun-Hoe ; Sung, Chi-Un ; Hwang, Yoo-Jin ; Lee, Jae-Keun ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 822~826
DOI : 10.5916/jkosme.2009.33.6.822
In case of engine room of ship, it uses type 2 ventilation system which supplies outside air forcibly by engine room ventilation fan, and naturally discharges air to outlet through low-pressed casing. The advantage of type 2 ventilation is that it makes inside with bi-pressure status to discharge contaminated materials to outside naturally. However, there is a phenomenon that pressure is greatly different between outside and inside due to huge amount of air supply by engine room ventilation fan. Therefore, we went aboard a container vessel which is on test run to analyze differential pressure with micronanometer by engine load and by combustion air supply method of engine. As a result, as engine load decreases (50, 75, 100%), the differential pressure between outside and inside tends to increase by 35% average, and the difference of pressure was 6.5 times maximum by combustion air supply method of engine.
Cooling Heat Transfer Characteristics of CO
in a Brazing Type Small Diameter Copper Tube
Oh, Hoo-Kyu ; Son, Chang-Hyo ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 827~834
DOI : 10.5916/jkosme.2009.33.6.827
The cooling heat transfer coefficient of
in a brazing type small diameter tube was investigated experimentally. The main components of the refrigerant loop are a receiver, a
compressor, a mass flow meter, an evaporator and a brazing type small diameter tube as a test section. The mass flux of
], the mass flowrate of coolant were varied from 0.15 to 0.3 [kg/s], and the cooling pressure of gas cooler were from 8 to 10 [MPa]. The cooling heat transfer coefficients of the brazing type small diameter copper tube is about
higher than that of the conventional type small diameter copper tube. In comparison with test results and existing correlations, correlations failed to predict the cooling heat transfer coefficient of
in a brazing type small diameter copper tube. therefore, it is necessary to develope reliable and accurate predictions determining the cooling heat transfer coefficient of
in a brazing type small diameter copper tube.
A Study on the Problem-Solving Method and Thermal Efficiency Properties at the Time of High Expansion Realization in a 4-Cycle Diesel Engine
Jang, Tae-Ik ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 835~842
DOI : 10.5916/jkosme.2009.33.6.835
The present thesis carried out a research on a compression pressure's reduction phenomenon and its countermeasure according to the thermal efficiency improvement method by a Miller method in 4-cycle low speed diesel engine. In case of retardation of intake valve closing time in a engine, the theoretical heat efficiency shows a remarkably reducing trend when a compression ratio is not compensated. Accordingly, the thermal efficiency showed an increasing trend in case of compensating the compression ratio. Especially, it could be understood that the theoretical heat efficiency at near ABDC
of intake valve closing time in case of compensation of the compression ratio was improved by around 25.1%, and the mean effective pressure was also increased by around 18.6%. Also, as the retardation of intake valve closing time increases, air quantity becomes insufficient due to a backflow phenomenon of intake air and thus thermal efficiency was decreased in a high load operation domain. The solving method of this problem is possible by supercharge. Therefore, in order to improve thermal efficiency by retardation of ntake valve closing time, the thermal efficiency improvement according to low compression is possible when there are a compensation device of a compression ratio and a supercharge device. This is a problem-solving method of low compression and high expansion cycle.
Analysis of Energy Efficiency Design Index and Onboard Power Capacity for New Building Ships
Lee, D.C. ; Millar Jr, Melchor M. ; Nam, J.G. ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 843~851
DOI : 10.5916/jkosme.2009.33.6.843
Much work has already been done to control and regulate the worldwide problems caused by climate change, particularly the issues on greenhouse gas (GHG) emissions. Carbon dioxide (
), having the highest form of concentration among GHGs composed around 1.0 billion tons of emission, and comprises about 98% of the total emissions from the shipping industry. Korean trade mainly rely on the sea transportation. Korean ship tonnages that was brought about by shipbuilders all over the country, continues to grow annually due to the prevailing demands on goods or material supplies and depicting only a small part of the global maritime activity. Nowadays, new build ships coming from the Korean Shipbuilders are being optimized by hull, structure and appendages design, The operational capability of the propulsion and auxiliary machineries in its maximum capacity to achieve the highest possible efficiencies for energy and onboard power use to mitigate
emissions are continually being done through the help of research and development. In this paper, the energy efficiency design index and anboard power capacity of Korean new build ships have been analyzed with response to data collected by ship types, and its respective fuel consumption in relation to
emission results. In response to climate change convention outcome proposals, the best way for the new build ships to become energy efficient is by lowering its operational speed thru adopting the state of the art diesel propulsion engines, patronizing the best sailing practice to lower the transportation cost on the different sea trade routes also helps in
A Numerical Approach to Effective Elastic Moduli of Solids with Microinclusions and Microvoids
Kang, Sung-Soo ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 852~859
DOI : 10.5916/jkosme.2009.33.6.852
For the analysis of solids containing a number of microinclusions or microvoids, in which the mechanical effect of each inclusion or void, a numerical approach is need to be developed to understand the mechanical behavior of damaged solids containing these defects. In this study, the simulation method using the natural element method is proposed for the analysis of effective elastic moduli. The mechanical effect of each inclusion or void is considered by controlling the material constants for Gaussian points. The relationship between area fraction of microinclusions or microvoids and effective elastic moduli is studied to verify the validity of the proposed method. The obtained results are in good agreement with the theoretical results such as differential method, self-consistent method, Mori-Tanaka method, as well as the numerical results by rigid body spring model.
High Temperature Salt Corrosion Property of Ferritic Stainless Steels
Song, Jeon-Young ; Park, Joong-Cheol ; Ahn, Yong-Sik ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 860~866
DOI : 10.5916/jkosme.2009.33.6.860
It is very important to choose optimal material having good corrosion resistance and capabilities for the part materials such as the automotive exhaust system under a hot salt corrosion atmosphere. Generally, two types of corrosion come into the automotive exhaust system. One is 'Condensate Corrosion', which is occurred by exhaust gas condensate formed at the inner surface of exhaust system heated up during driving, which results in the acid condensate pitting. The other is 'High Temperature Salt Corrosion' occurring from the interaction between the chloride ion coming from salt at the seaside district or snow salt and the outer surface of exhaust system. By the corrosion attack, the main muffler is firstly damaged and the life cycle of an automobile is significantly decreased. It has been investigated that the hot salt corrosion properties of a STS 409L and 436L ferritic stainless steels which are well-known for the materials of the automotive exhaust system. In addition, the corrosion properties of hot dip aluminum coated STS 409L have been compared with uncoated steels. Aluminum coated STS 409L showed a superior corrosion resistance than uncoated STS 409L, and futhermore showed a better corrosion resistance than a STS 436L, which is an expensive ferritic stainless steel having a excellent corrosion resistance caused from more chromium content of an alloying element.
Numerical Analysis of Fluid Flow and Filtering Efficiency in Centrifugal Oil Filter
Bang, Kwang-Hyun ; Kim, Kyung-Kyu ; Song, Young-A ; Kim, Pyung-Su ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 867~872
DOI : 10.5916/jkosme.2009.33.6.867
In centrifugal oil filters particles are forced to move toward the filter casing wall by centrifugal force in the rotating oil flow and the particles are trapped and removed on the filter paper installed at the wall. In the present study, flow field of oil and particle motion in a centrifugal oil filter has been numerically calculated in order to estimate the filtering efficiency for various operating conditions. Fluent code was used for the numerical calculations. Uncoupling the oil flow and the particle motion and the use of particle tracking trajectory enabled the estimation of filtering efficiency for various particle sizes, particle density and the filter rotational speed. Higher filtering efficiency was observed for heavier and larger particles as well as higher filter rotational speed. For the typical case of the particle density of
and the particle size of
at 3500 RPM, the calculated filtering efficiency per passage was 0.31.
Appearing Condition of Breaking Waves at Infant Stage and Numerical Simulation
Kwag, Seung-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 873~879
DOI : 10.5916/jkosme.2009.33.6.873
The steady breakers at an infant stage are investigated through the numerical simulation. The appearing condition and characteristics of the sub-breaking waves are reviewed by analysing bow waves. The instability analysis is possibly done through the relationship between the free-surface curvature and circumferential force, which is obtained from the momentum equations. Navier-Stokes equations are solved by a finite difference method where the body-fitted coordinate system, the wall function and the advanced mesh system are invoked. The numerical result shows that the gradient of M/
is greatly influenced by the Froude number and the decrease of M/
indicates that the flows are unstable. Additionally flows with plunging or spilling are simulated successfully, but the application of breakers to the severely broken wave still remains to be settled in the future.
Put Investigation on the energy saving method using inverter driving for cooling pump at MMU training ship
Lim, Myeong-Hwan ; Ahn, Byong-Won ; Kim, Bu-Gi ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 880~885
DOI : 10.5916/jkosme.2009.33.6.880
The ships have a lot of electric machinery needed to supply electricity from the moment of launching coming out of dry dock to docking at jetty. Thus, the ships always have to use alternator and electric machinery that has low efficiency under the low load. Many government service ships like the MMU training ship have been spending lots of time at jetty rather than sailing at sea. These ships are operated under the condition of low load due to the operation of basic machinery at jetty and electric machineries are driven with the status of low efficiency. This paper would suggest the energy saving method for these ships. The investigation describes that shore connection is a great asset to these ships and that the flow rate control by adjusting revolution with the adoption of inverter is better than flow rate control by using throttle valve to save energy. The result is based on the investigation of cooling pump at MMU training ship.
A Numerical Study on the Aerodynamic Characteristics for a HAWT of NREL Phase VI
Mo, Jang-Oh ; Lee, Young-Ho ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 886~895
DOI : 10.5916/jkosme.2009.33.6.886
The purpose of this work is to compare and analyze computed results with experimental data of NREL (National Renewable Energy Laboratory) Phase VI for the whole operating conditions of various wind speeds using
turbulence model provided in the commercial code, FLUENT. Performance results such as power coefficient, shaft torque, pressure coefficient show a good agreement with experimental data. But, root bending moment is over-predicted than the experimentally measured value by about 30% for the whole operating conditions because of indefinite measurement reference. Nevertheless, these results qualitatively show a good tendency in the aspect of aerodynamic performance. As wind speed increases, streamlines on the surface of blade show more and more complex pattern.
Effects on Exhaust Gas Emission in Combined EGR System of Gas Engine and Diesel Engine
Yoo, Dong-Hoon ; Nishida, Osami ; Lim, Jae-Keun ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 896~902
DOI : 10.5916/jkosme.2009.33.6.896
EGR is applied in order to lower temperature of combustion chamber by using the specific heat of carbon dioxide in engine exhaust gas. However, the problem of EGR system in diesel engine is high PM concentration. Combined EGR system can be reduced it by mixing exhaust gas of gas engine into the intake air of diesel engine. This experimental study was designed for EGR system for both engines use. The results of EGR experimental study by using diesel engine and gas engine are as follows. 1) The pressure of combustion and rate of heat release decreased. 2) The specific fuel consumption increased. But, up to middle load, it little increased. 3) NO concentration has decreased up to 50% in almost all combustion area. 4) The variation of the PM concentration at low load is not so seen. But at high load, PM increased rapidly when concentration of oxygen is decreased and most of it caused the increasing of Dry Soot.
An Experimental Study on Flow Noise with Swirl in a 180 Degree Circular Tube
Chang, Tae-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 903~911
DOI : 10.5916/jkosme.2009.33.6.903
During the past three or four decades, the characteristics of turbulent swirling flow have been studied extensively because of their scientific and academic importance. This research deal with the periodic flow oscillation with and without swirling flow in a 180 degree circular tube using hot wire anemometry, microphone and accelerometer. The frequency regions are observed through the structured oscillation from spectrum. This work carried out to measure the sound level by using hot wire anemometry, microphone and accelerometer for each Reynolds number,
respectively at the entry of the test tube with and without swirl flow.
A Study on Flow Characteristics of the Entrance Region of Wavy Channel by PIV
Lee, Cheol-Jae ; Cho, Dae-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 912~917
DOI : 10.5916/jkosme.2009.33.6.912
An experimental flow visualization study of the entrance section of channels formed with wavy plates was made. The experiments were conducted in a water channel and a laser illuminated particle tracking was used as the technique of flow visualization. The flow region that were found in the experiments are steady, unsteady and significantly-mixed flows. Instabilities of the flow first appear near the exit of the channel. As the Reynolds number increases, the flows are characterized by the appearance of flow separation and the growth of recirculation region.
High-Speed Active Vibration Control System of Plate using TMS320C6713DSK
Choi, Hyeung-Sik ; Her, Jae-Gwan ; Seo, Hae-Yong ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 918~924
DOI : 10.5916/jkosme.2009.33.6.918
This paper deals with the experimental assessment of the vibration suppression of the smart structures. First, we have presented the paper about the new high-speed active control system that we have developed using the DSP320C6713 microprocessor and a peripheral system composed of a data acquisition system, A/D and D/A converters, piezoelectric (PZT) actuator/sensors, and drivers using PA95. Since fast data processing is very important in the active vibration control of the structures, we utilized the fast processing DSP320C6713 microprocessor as a main processor to the controller and fast peripheral devices for fast control loop. To realize a fast active vibration control, we have analyzed and tested the processing time of the peripheral devices and provided the corresponding test results. Especially, we have focused on achieving the fast signal amplification of the PA95 device since it takes most of loop times of the control system. Finally, we performed numerous experiments of active vibration control of the aluminum plate to validate the superior performance of the developed control system based on previous mode tests of the plate.
Development of submersion sensors using multi-mode fibers spliced with a fiber Bragg grating
Sohn, Kyung-Rak ; Key, Kwang-Hyun ; Shim, Joon-Hwan ; Cho, Seok-Je ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 925~931
DOI : 10.5916/jkosme.2009.33.6.925
This paper reports a preliminary experimental investigation and characterization of an optical fiber-based submersion sensor system for applications in water flooding and leakage. The sensor system comprises a multi-mode fiber spliced with fiber Bragg grating and an intensity-based interrogator. Submersion tests were conducted in water-air and Glycerin-air environments. By the refractive index of the fiber-probe surrounding materials, the reflectance and the detecting power level is determined. When the probe is dipped into the water, the optical output power dramatically decreases from -7.5dBm to -17.5dBm. But, the center of Bragg wavelength is not affected in spite of external material changes. Temporal response characteristics of the sensor system is investigated to verify the real-time reaction. When the probe is immersed into the liquid, there is no transition time.
Hybrid Control of Position/Tension for a Stringing Troy Wire
Hong, Jeng-Pyo ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 932~938
DOI : 10.5916/jkosme.2009.33.6.932
As a stringing troy wire is installed by manual operation, it is necessary to scheme the automatic system for stringing troy wire. To accomplish a task of this kind, in this paper an approach to designing controllers for the hybrid Position/Tension control of a stringing troy wire is presented. Position control system is designed based on equation of dc motor and motion equation of robot, it is controlled by feedback with a detected speed dc motor. Tension control system is designed based on equation of ac servomotor for generating torque and dynamic equation of a troy wire, it is controled by feedback with a detected tension. The control parameters is determined by simulation in independence operation of each system. To suppress a mutual interference that the disturbance occur in operating of two task at same time. Dynamic hybrid control is proposed by feed forward compensator with a disturbance accelerator and a step torque at start. The operation of proposed system is simulated and experimented, results is verified the utilities.
Characteristic Analysis of Independent 6 phase BLDC Motor
Jung, Sung-Young ; Kong, Young-Kyong ; Bin, Jae-Goo ; Shin, Pan-Seok ; Kim, Jang-Mok ; Choi, Hong-Soo ; Oh, Jin-Seok ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 939~945
DOI : 10.5916/jkosme.2009.33.6.939
This paper is described BLDC motor in the submarine propulsion system which is asked high power per unit area. This study analyzes the independent 6-phase BLDC motor a specific extended by existing the independent 3-phase BLDC motor and propose forward development direction. Independent 6-phase motor has a characteristics that phases of stator are independent electrically with each other and two's independence 3-phase BLDC motor are linked with each difference of 60 degree. Six-phase BLDC motor is simulated with Matlab-simulink, the simulation result has a high current and low torque pulsation than existent independence 3-phase BLDC motor.
A Study on the Speed and Torque Control of Propulsion Motor for Electric Propulsion Ship by Direct Torque Control
Kim, Jong-Su ; Oh, Sae-Gin ; Kim, Seung-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 946~951
DOI : 10.5916/jkosme.2009.33.6.946
An induction motor based on DTC(Direct Torque Control) is being increasingly used in various industrial applications. DTC offers faster torque response and better speed control with lesser hardware and processing costs in compared with other controlled drives. This study was to evaluate performance of DTC for induction motor of electric propulsion ship. The simulation results indicated good speed and torque response from the low to middle speed range. Also, DTC has advantages such as the independency on motor parameter.
Design and Fabrication of a Ballast Water Treatment System Using UV Lamps
Pyo, Tae-Sung ; Cheon, Sang-Gyu ; Park, Dae-Won ; Choi, Sung-Kuk ; Kim, Seong-Yeon ; Kil, Gyung-Suk ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 952~958
DOI : 10.5916/jkosme.2009.33.6.952
The International Maritime Organization (IMO) has adopted the ballast water management convention at a diplomatic conference in early 2004 that all ships should be equipped with a treatment system from 2010 gradually. In this paper, the disinfection characteristic of ultra-violet (UV) rays was studied and a ballast water treatment system (BWTS) which can treat
/h sea water was manufactured. The system consists of a disinfection chamber with six 3.5 kW UV lamps which are operated by magnetic ballasts, a programmable logic controller (PLC) and set of pipe lines. The biological disinfection efficacy of the prototype BWTS was evaluated following the IMO rules using zooplankton such as Artemia and Rotifer species for the size over
, and phytoplankton such as Tetraselmis and Thalassiosira species for the size between 10 to
. From the experimental results, the disinfection efficacy was 99.99 % that meets the IMO requirement. However, more studies on an energy saving system are needed because the consumption power of the prototype system is as high as over 21 kWh for
Analysis of Disinfection Performance of UV LEDs for a Phytoplankton
Kil, Gyung-Suk ; Choi, Sung-Kuk ; Park, Dae-Won ; Kim, Sung-Wook ; Cheon, Sang-Gyu ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 959~964
DOI : 10.5916/jkosme.2009.33.6.959
This paper dealt with the disinfection performance by Ultra-Violet Light Emitting Diode (UV LED) for a phytoplankton as a basic study for the development of a low-energy consumption ballast water treatment system. UV LEDs having peak wavelength of 255nm, 265nm and 280nm were used in the experiment. UV LED modules with driving circuit were fabricated, and optical and electrical characteristics of them were analyzed. The disinfection performance for phytoplankton depending on the UV wavelength was evaluated by comparing the number of phytoplankton before and after the UV treatments. The experimental result showed that the highest disinfection wavelength for the phytoplankton was 265nm.
Review of stability calculation of an artificial reef in the breaking wave zone of coastal waters
Kim, Chang-Gil ; Oh, Tae-Gun ; Suh, Sung-Ho ; Kim, Dae-Kweon ; Kim, Byung-Gyun ; Choi, Yong-Suk ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 6, 2009, Pages 965~974
DOI : 10.5916/jkosme.2009.33.6.965
The current study reviews the formula used to calculate the stability of an artificial reef in the breaking wave zone of coastal waters. A comparison was carried out between the existing formula and a new formula that takes into account the water particle velocity in the breaking wave zone. Water particle velocity was analyzed using the Fluent (CADMAS-SURF) software program. The new formula took into various factors, including the difference in the drag coefficient due to the direction of the current and the ratio of distance between two reefs. The drag coefficient of the artificial reef due to the direction of the current was 0.84 when the distance ratio was 0.5. When the artificial reef was placed at 45 degree angle to the current, the product of the drag coefficient and the project area were 40 to 46 % greater than when the reef was placed at 90 degree angle. Our results regarding the stability of an artificial reef indicate that the new formula provides the designers of artificial reefs with a more rational and economic design rationale rather than the existing formula.