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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 25, Issue 6 - Nov 2001
Volume 25, Issue 5 - Sep 2001
Volume 25, Issue 4 - Jul 2001
Volume 25, Issue 3 - May 2001
Volume 25, Issue 2 - Mar 2001
Volume 25, Issue 1 - Jan 2001
Selecting the target year
Present Status of Wind Energy and Photovoltaic Research as the Clean Energy
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 201~512
Marine Diesel Engline and Air Pollution
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 457~470
Emissions Limits and Measures for Reducing Exhaust Emissions in Marine Diesel Engines
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 471~486
The principal trends in the course of emission control legislation are reviewed in this paper. In order to keep such a regulation, moreover, an inquiry ito the concrete technical possibility is conducted through review articles, Also, the composition of exhaust gases emitted from a marine diesel engine are investigated as several samples and the measures that can satisfy the value of regulation are handled with laying stress on the control methods discussed to date. It was concluded that various combined systems can be made to reduce NOx emissions without deteriorating substantially navigation costs since many technologies for reducing NOx emissions are being developed. All heat engines suffer from SOx emissions. There are two methods for reducing SOx emissions: desulfurization from exhaust gas and removal of sulfur composition from fuel oil. However it is necessary to watch the development of these technologies to evaluate which method is more favorable. Heat engines have a big problem in the regulation of environmental pollution from exhaust emissions. In the near future, however, diesel engines may be superior to other heat engines, owing to the high thermal efficiency, although the sales of individual models in dises engines may be prosperous and declining.
Regulations for the Prevention of air Pollution from Ships -For NOx Emission from Marine Diesel Engines-
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 487~500
Vibration Evaluation Criteria of Rotating Machinery in Ships
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 513~539
Application of PIV to Fluid Machinery and Assessment of Ventilation Performance in Ships
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 540~551
Measurement of Heat Transfer and Friction Coefficients for Flow of Air in Noncircular Ducts At High Surface Temperatures.
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 552~562
Measurement of average of heat transfer and friction coefficients were obtained with air flowing through electrically heated ducts having square, rectangular(aspect ration, 5), and triangular cross section for range of surface temperature from
R and Reynolds number from 1000 to 330,000. The results indicates that the effect of heat flux on correlations of the average heat transfer and friction coefficients is similar to that obtained for circular tubes in previous investigation and was nearly eliminated by evaluating the physical properties and density of the air a film temperature halfway between the average surface and fluid bulk temperatures, With the Nusselt and Reynolds numbers on the hydraulic diameter of the ducts, the data for the noncircular ducts could be represented by the same equations obtained in the previous investigation for circular tubes. Correlation of the average difference between the surface corner and midwall temperatures for the square duct was in agreement with predicted values from a previous analysis. However, for the rectangular and triangular ducts, the measured corner temperature was greater by approximately 20 and 35 percent, respectively, than the values predicted by analysis.
Studies on Coupled Vibrations of Diesel Engine Propulsion Shafting(2nd Report: Analyzing of Forced Vibration with Damping)
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 563~572
With the results of calculation for natural frequencies the reponses of forced coupled vibration of propulsion shafting system were investigated by the modal analysis method. For the forced vibration response analysis, the axial exciting forces, the axial damper/detuner, propeller exciting forces and damping coefficients were extensively considered. As the conclusion of this study, some items are cleared as follows.-The torsional vibration amplitudes are not influenced by the radial excitation forces of the crank shaft. -The axial vibration amplitudes are influenced by the tangential exciting forces as well as the radial exciting forces of the crank shaft. The increase of the amplitudes is observed in the speed range at the neighbourhood of any torsional critical speed. 1The closer the torsional and axial critical speed. the larger coupling effect becomes. -The axial exciting force of propeller is relatively strong comparing with axial exciting forces of cylinder gas pressure and oscillating inertia of reciprocating mechanism. Therefore, the following conclusions are obtained. -Torsional vibration calculation with the classical one dimensional model is still valid. -The influence of torsional excitation at each crank upon the axial vibration is improtant. especially in the neighbourhood of a torsional critical speed. That means that the calculation of axial vibration with the classical one dimensional model is inaccurate in most of cases.
Analysis of Characteristics on Small Air-Conditioning Type Evaporator
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 573~580
When investigating optimum design of the evaporator in the refrigeration and heat pump systems, there is still lack of data for the dynamic characteristics of the evaporator, This is due to the fact that the static characteristics in the evaporator are absolutely difficult to measure and are burdened with uncertainties. In this study, the simulation works for static characteristics in the evaporator of small air conditioner are carried out to obtain the data of dynamic characteristics. In the simulation, the test evaporator is divided by two-phase evaporating region and single-phase heating region. The major parameters are refrigerant flow rate, heat transfer coefficient of air, air velocity and air temperature. The results show that the calculation method for tube length is an easy-to-use to model analysis of static characteristics and to determine state of refrigerant in the evaporator. The effects of the four parameters on the length of evaporating completed point and heat flow rate to the evaporator are clarified.
A Study on Heat Transfer and Pressure drop Characteristics in Plate Heat Exchange
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 581~587
Plate heat exchange(PHE) will be applied to the refrigeration and air conditioning systems as evaporators or condensers for their high efficiency and compactness. The purpose of this study is the analyze the characteristics of heat transfer and pressure drop of plate heat exchanger. Numerical work was conducted using the FLUENT code k-
model. Also the dependence of heat transfer coefficient and friction factor on Reynolds number was investigated. As the Reynolds number increases, it is found that heat transfer coefficient also increases, but friction factor decreases. The study examines the internal flow, thermal distribution and the pressure distribution in the channel of plate heat exchanger. The results of CFD analysis compared with experimental data, and the difference of friction factor and Nusselt number in plate heat exchanger are 10% and 20%, respectively, Therefore the CFD analysis model is effective for the performance prediction of plate heat exchanger.
A Study on the Thermal Characteristics of Low Temperature Vacuum Drying by Hot Water Temperature
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 588~594
The aim of this paper is to develop the low temperature vacuum dryer, with low initial investments and operating costs, easy operating method and trouble-free operation Usally operations just below atmospheric pressure, as with direct dryers, but some are built for vacuum operation with pressure as low 50 mmHg abs. The lowers the boiling point to
The experimental data of quantitative analysis for using practically were obtained by the constant drying rate period and reducing drying rate period according to the temperature of hot water which is the experimental parameters of present experiment. As the results, it took about 20 hours for material to reach about 18% of the final moisture content is order to store products for a long time about 450% of the early moisture content at the beginning of drying and maximum drying rate comes to about 0.30 kg/m2hr at about 350% of the moisture content.
An Experimental Study on Understanding of Production Mechanism of a Mist from Fin-Tube Heat Exchanger
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 595~604
As an improvement in the standard of living and economic growth, the demand for air conditioning equipment is increasing rapidly. Nowadays, air conditioning equipments are being used for industry, large building, house and car. There equipments were concentrated on improving heat efficiency of economic aspects while thy design heat exchanger for cooling and heating. These air conditioning equipments using heat exchanger cause a discomfort to user due to generating mist at the beginning of operating. Therefore, the user demand air of high class and quality. In this experimental study, to acquire elementary data for development of heat exchanger which be able to supply air of high quality, that is to say, possess a restraint effect of mist generation. We estimate an effect on cooling plate quality, supply air velocity, supply air temperature, cooled plate temperature and supply air relative humidity which have an influence on outlet air condition of heat exchanger.
A Study on the Improvment of Engine Performance Simulation Using Multi-Length-Scale Model and MOC
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 605~616
Generally, there are two methods in researching internal combustion engines. One is by experimental research and the other is by computer simulation. The experimental research has many merits that researchers can get data for engine performance, but it has also some demerit of cost and time. If there is an engine simulation code with accuracy for the solution, it is very convenient to predict the performance and optimum design value of the engine. In this study, engine performance simulation program has been improved to predict the transient variation of properties of gas in cylinder, intake and exhaust manifolds, There total program code was developed to calculate the pressure, flame factor and turbulent intensity, As a result of present study, the authors could predicted the in-cylinder pressure, intake manifold pressure and the engine performance in various conditions. The authors also could easily prepare the tool if optimum design of manifold and in-cylinder geometry.
A Study on Stress Analysis for Design of Composites Shaft on Small Ship by Filament Winding Process
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 617~622
The purpose of this study is to design and the analyze the stress of composited shaft which is wound by filament winding method. The composites shaft has high strength and reduction in weight compared to metal shaft. The classical laminate plate theory(CLT) was used fro analysis the stress, and for structure design. In order to replace metal shaft by composites shaft, the diameter of shaft was determined to
40. The ration of diameter was determined to 0.4 for torsional moment with CLT. In this result of analyzing the stress, composites shaft was safe
C of winding angle, and was fractured on
Design of a Robust Control System Using the Fuzzy-LQ Control Technique
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 623~630
The conventional control techniques based a mathematical model are not well suited for dealing with ill-defined and uncertain system like a linear quadratic control. Recently, fuzzy control has been successfully applied to a wide variety of practical problems such as robot, water purification, automatic train operation system etc. In this paper, a design technique of robust Fuzzy-LQ controller for each subsystem is designed. Secondly , all the subsystem controllers are combined by fuzzy weighted averaging method. Finally the effectiveness of the proposed controller is verified through a series of computer simulations for an inverted pole system.
Analysis of Residual Stresses at Manufacturing Precesses for Microaccelerometer Sensors
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 631~635
The major problems associated with the manufacturing processes of the microaccelerometer based on the tunneling current concept is the residual stress. This paper deals with finite element analysis of residual stress causing pop up phenomenon which are induced in micromachining processes for a microaccelerometers sensor using silicon on insulator(SOI) wafer. After heating the tunnel gap up to
and get it through cooling process and the additional beam up to
get it through the cooling process. We learn the residual stress of each shape and compare the results with each other, after heating the tunnel gap up to
the Pt deposition process. The equivalent stresses produced during the heating process of focused ion beam(FIB) cut was also to be about
and cooling process the gradient of residual stresses of about
still at cantilever beam and connected part of paddle. We want to seek after the real cause of this pop up phenomenon and diminish this by change manufacturing processes of microaccelerometer sensors.
A Study of Two Phase Flow Control in a Combustion Chamber
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 637~643
Two-phase flow in a combustion chamber is experimentally analyzed according to the five different conditions in the Reynolds numbers of
. As the height difference between the primary and secondary jets increases, the secondary has a little less effect on the primary one in the case on the same height difference, the primary jet is affects as the velocity of th secondary on increase. The primary-jet flow field cause the particle concentration since is controlled by the velocity of secondary jet, the height difference, and the angle of primary jet in the test section.
Design and Development of an Electronic Control Unit of the Automobile Engine for Optimal Fuel Injection and Spark Timing Control
Journal of the Korean Society of Marine Engineering, volume 25, issue 3, 2001, Pages 644~654
In this paper, an electronic control unit of the automobile engine for optimal fuel injection an spark timing control has been designed and developed. This system includes hardware and software for a precise control of fuel injection and ignition timing. Especially, the crank angle sensor provides two separate signals: One is the position signal (POS) which indicates 180 degree pulses per revolution, and the other is the reference signal (REF) that represents each cylinder individually. Consequently, the developed engine control system has been able to control fuel injection and ignition timing more quickly and accurately. Through the experiment, it has been found that the fuel injection duration and the position of MBT have been influenced by coolant temperature, air flow rate and engine speed.