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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korea Society For Power System Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Power System Engineering
Editor in Chief :
Volume & Issues
Volume 11, Issue 4 - Nov 2007
Volume 11, Issue 3 - Aug 2007
Volume 11, Issue 2 - May 2007
Volume 11, Issue 1 - Feb 2007
Selecting the target year
Selection and Analysis of Operating Parameters for Condition Monitoring of Emergency Diesel Generator at Nuclear Power Plant
Park, J.H. ; Choi, K.H. ; Lee, S.G. ; Park, J.E. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 3, 2007, Pages 3~8
The emergency AC power supply system of the nuclear power plant is designed to supply the power to the nuclear reactor at the emergency operating condition. The safety function of the diesel generator at the nuclear power plant is to supply AC electric power to the plant safety system whenever the preferred AC power supply is unavailable. The reliable operation of onsite emergency diesel generator should be ensured by a conditioning monitoring system designed to maintain and monitor and forecast the reliability level of diesel generator. To do this kind of diesel generator condition monitoring we reviewed several operating factors and history of the wolsong unit 3 diesel generator and selected the proper conditioning monitoring operating factors.
A Study on Optimum Application of Unutilized Energies in the Jeju Environment Facility
Kang, B.C. ; Park, Y.C. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 3, 2007, Pages 9~15
This paper provides a methodology for the optimization of waste heat usage in Jeju Province. The incineration plant was considered as heat source and the food garbage plant and the youth hostel were selected as heat sink of this study. The distribution of the reusing energy in incineration plant is decide by load analysis and numerical calculation of the operational methodology. The main objective of this study is on the reduction of the fuel costs and reuse of waste heat. As the results, the efficiency of the incineration plant and two heat sink, the food garbage plant and the youth hostel, are improved and economical suggestions are proposed through the optimization analysis.
Effect of Aspect Ratio on Gas Microchannel Flow
Tajul, Islam ; Lee, Y.W. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 3, 2007, Pages 16~21
Three dimensional numerical study was carried out to investigate the effect of aspect ratio on microchannel flow. We considered five straight rectangular channels with aspect ratios (height/width) 0.2, 0.4, 0.6, 0.8 and 1.0. Nitrogen gas flow was investigated for both slip and noslip wall boundary conditions. Isothermal wall condition was assumed. We used control volume method for this simulation. The slip velocity increases with the increase of aspect ratio. Friction coefficient decreases with the increase of aspect ratio. Slip friction coefficient is lower than noslip friction coefficient. Mass flow rate of slip model is higher than that of noslip model. We compared our results with the experimental result reported in the literature. The agreement was good.
Structure Analysis on Thermal Deformation of Super Low Temperature Liquefied Gas One-module Vaporizer
Park, G.T. ; Lee, Y.H. ; Shim, K.J. ; Jeong, H.M. ; Chung, H.S. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 3, 2007, Pages 22~28
Liquefied gas vaporizer is a machine to vaporize liquefied gas such as liquid nitrogen(
), liquefied natural gas(LNG), liquid oxygen(
) etc. For the air type vaporizer, the frozen dew is created by temperature drop (below 273 K) on vaporizer surface. The layer of ice make a contractions on vaporizer. The structure analysis on the heat transfer was studied to see the effect of geometric parameters of the vaporizer, which are length 1000 mm of various type vaporizer. Structure analysis result such as temperature variation, thermal stress and thermal strain have high efficiency of heat emission as increase of thermal conductivity. As the result, Frist, With-fin model shows high temperature distribution better than without-fin on the temperature analysis. Second, Without-fin model shows double contractions better then with-fin model under the super low temperature load on the thermal strain analysis. Third, Vaporizer fin can be apply not only heat exchange but also a stiffener of structure. Finally, we confirm that All model vaporizer can be stand for sudden load change because of compressive yield stress shows within 280 MPa on thermal stress analysis.
The Effect of Indoor Temperature Change on Human Physiology for Comfort Control during Sleep Early Stage
Shin, H.J. ; Kim, D.G. ; Jeong, S.K. ; Kum, J.S. ; Kim, H.C. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 3, 2007, Pages 29~34
Existent researches about indoor thermal environment have been focused on to seek human's comfort in daytime. Also researches about thermal comfort during the sleeping time that is important for resting and recharging to modern people have been seldom existed. At present, as global warming phenomenon is being continued, most people are going through inconvenience by sultriness during the sleeping hours in sweltering summer night. Therefore we need another control method of an air conditioner to keep human's thermal comfort. Ambient temperature is a common factor of the environment, but analysis of its effect on human body physiology is still unknown. The effect of ambient temperature on human sleep has been increasingly studied in the last decade. This research investigated about optimal indoor temperature to maintain proper skin temperature and comfortable sleep when indoor air is cooled by an air conditioner in sweltering summer night.
Study on the Multi-measuring Method for Evaluation of Internal Leak of Power Plant Valve
Lee, S.G. ; Park, S.K. ; Park, J.H. ; Kim, K.H. ; Kim, Y.B. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 3, 2007, Pages 35~40
Leak would happen because of the damage of high temperature and high-pressure valve in nuclear power plant. condition based prevention maintenance is essential by using the suitable method based on local condition. Energy loss prevention can prevent from an accurate test, Local actually and ability. The methods of test for high energy fluid leak at present are analysis of
, AE(Acoustic Emission) analysis, and thermal image. The result for test of secondary system in nuclear power plant Unit reveals that the AE occurred clearly in leakage situation, but thermal image didn't occur. It is identified that leak is occurred when the orifice located front and back of valve operates. It shows that making a impatient judgment by using the single method if it is leakage is containing uncertainty. So we think that using the Multi-Measuring method is more sound judgment than single-measuring method.
The Effect of Heat Input on Grooving Corrosion Behavior in the Welds of Electric Resistance Welding Steel Pipe
Lee, B.W. ; Lee, J.S. ; Park, H.S. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 3, 2007, Pages 41~46
The microstructure and electrochemical analysis of welds of electric resistance welding(ERW) pipe were investigated. The direction of metal flow line in HAZ of ERW pipe shifted to the inner(or outer) surface of pipe by plastic deformation during welding. The lowest heat input welds of ERW pipe was showed crack by liquid penetrant testing. Accelerated corrosion test by constant current density of 20mA/
developed groove at the welds of ERW pipe and the measured grooving factors were about
. Corrosion potential of base metal obtained by cyclic polarization in artificial sea water(3.5wt.% NaCl solution) was 100mV higher than that of weld metal of ERW pipe.
A Study on the Burr Height in Shearing Steel Sheet for Automobile Parts
Ko, D.L. ; Jung, D.W. ; Kim, J.M. ; Lee, K.S. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 3, 2007, Pages 47~52
Punching, blanking, trimming and slitting are widely used in shearing processes in sheet metal forming of automotive parts. In this paper the effects of clearance, cutting angle and tool sharpness on the formation of burr were investigated by experimental method in shearing processes of steel sheets, SPCEN and SPRC35E. The amount of burr and the shapes of burr were different between two kinds of steel sheets. It has been shown that the cutting angle of the shearing blade had no effects on the height of burr when the clearance was below the 10% of the steel sheet thickness, and also that the height and shape of burr were not affected by the cutting angle when the wear of shearing blade was below the 10% of the steel sheet thickness. It was known that there had been existing the critical clearance of 10 to 15% for the tested steel sheet, SPCEN and SPRC35E.
Effects of the Damaged Axial-flow Compressor Blade on the Gas Turbine Components
Kang, M.S. ; Yun, W.N. ; Kim, K.Y. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 3, 2007, Pages 53~58
The ruptured blade which is rotating at high speed can damage severely the all stage compressor blades and the turbine components. If the shattered blades flow downstream inside the turbine parts, then the turbine blades and vanes can be damaged. The small parts of shattered blades which are flowed into the turbine parts pass through without any damages in the leading edge of the first stage stationary blades. Then they bump against the convex side of the leading edge of the first stage moving blades and the trailing edge of the first stage stationary blades repeatedly. The debris of shattered blades may plug the cooling holes in the turbine blades and vanes. The dent damage and the coating delamination could be also occurred by the debris of shattered blades flowed downstream inside the combustion liner and the transition piece. This paper analyzes the influence on the turbine components and the damage mechanism and characteristics in case of the damaged blade of the multiple-stage axial flow compressor.
Study on the Pose Control of a 6 DOF Simulator with Pneumatic Cylinder Driving Apparatus
Jeong, J.H. ; Ji, S.W. ; Jang, J.S. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 3, 2007, Pages 59~65
In this study, 6-DOF simulator using pneumatic cylinder driving apparatus was manufactured because a pneumatic cylinder driving apparatus is superior to electric driving motor and hydraulic actuator, which used in traditional 6-DOF simulator, in competitive price and acceleration performance, and, 6-DOF motion can be realized at a low price in case that relatively low load is imposed on the simulator. The possible range of pose control of the simulator was investigated by inverse kinematics, and, it was controlled by a linear controller derived from linear model of the simulator. The Experimental results show that the simulator follows given coordinate well.
Proposal of Practical Reference-Model and It's Performance Improvement for PID Control
Hur, J.G. ; Yang, K.U. ;
Journal of the Korea Society For Power System Engineering, volume 11, issue 3, 2007, Pages 66~72
This study proposed new method to decide the reference model necessary for design PID controller. In generally, control design problems using the reference model have the following two factors. One factor is that numerical model of the controlled system can be obtained extremely, and the other is that specification for the closed-loop dynamic performance is pure moderate. Therefore, the control design procedure is essentially based on the partial reference model matching which offers a reasonable method to simplify the design and the controller configuration under the controlled system uncertainty. ITAE(Integral of time-multiplied absolute error) performance index and Kitamori method etc. which were used a reference model method had a limit to settling time and rising time of reference model that it arrived to steady state response according to the controlled system. On this study, if it only knew peak time of overshoot and settling time by measurement signal of the controlled system, it can be made the reference model easily. We proposed new method to improve performance index of the reference model superior to existing reference model index and illustrate the numerical simulation results to show the effectiveness of proposed control method design.