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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 5, Issue 4 - Nov 2001
Volume 5, Issue 3 - Aug 2001
Volume 5, Issue 2 - May 2001
Volume 5, Issue 1 - Feb 2001
Selecting the target year
Domestic Laws and Regulations on SI Unit System and Their Enforcements
Lee, I.Y. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 5~10
A Study of Performance Test of High Speed Solenoid for Fuel Injector in Diesel Engine
Cho, K.H. ; Rha, J.H. ; Ahn, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 11~16
In the DI diesel engine of passenger cars, common rail injection system have been used to improve the engine performance and reduce the exhaust emission by controlling injection timing, injection pattern, and injection duration. In case that common rail injection system is applied to high speed DI diesel engine, it is necessary to have high response and good repetition characteristics. These characteristics of injector depend on the characteristics of solenoid. Thus, to apply the common rail injection system in the high speed diesel engine, we had designed and made a multi-pole solenoid, and carried out repetition, response test to compare the multi-pole solenoid with the gasoline Injector solenoid. The result shows that repetition and response characteristics of multi-pole solenoid have better characteristics than the gasoline injector solenoid.
Characteristic of the Spray Behavior in accordance with Revolution Speed of Fuel Injection Cam for DI Diesel Engines
Kim, Y.S. ; Ra, J.H. ; Lim, B.H. ; Ahn, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 17~24
In order to investigate a characteristic of the behavior of spray pattern in accordance with running conditions for a DI diesel engine, the PLN Injection system with changeable revolution speed of fuel injection cam was set up, and through this, history curves of injection pressure for a similar real DI diesel engine were able to be displayed. Authors visualized and analyzed the sprays at various revolution speed of fuel injection cam, and found out that fuel distributions of the sprays in the low speed condition were bad, fuel with air was injected from the hole of nozzle at the beginning of injection, and wide spray angle at the early stage of injection became narrower with elapsed time, but wider again at the end of injection.
A Study on the Analysis of Engine Accidents on Fishing Vessels
Kim, K.J. ; Koh, D.K. ; Kim, Y.S. ; Kim, J.H. ; Ahn, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 25~30
The basis of all approaches to improve reliability of marine engines exists in analyzing the field data of troubles and failures in marine engines. In this paper, we analyzed the engine accidents of Korean fishing vessels for five years from 1995 to 1999, firstly according to engine systems, type of fishing vessels, engine makers, cylinder number, engine power and tonnage, secondly by using of principal component analysis method, one of multi-variate data analysis method. Finally, we proposed the measures to reduce engine accidents of fishing vessels for improvement of an environment in fishing industry.
A Study on the Turbulence Enhancement of Jet Flow by the Ultrasonic Forcing in a Coaxial Circular Pipe
Ju, E.S. ; Lee, Y.H. ; Song, M.G. ; Lee, S.B. ; Son, S.W. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 31~37
A study to obtain the enhancement of turbulence at low Reynolds number is carried out by adding ultrasonic force into the jet flow field of a coaxial circular pipe which can afford the sufficient data of flow characteristics with the shear flow and turbulence flow in spite of its simple shape. A coaxial circular flow field is made vertically in a large and transparent acryl tank. The time mean velocity vector, distribution, kinetic energy and turbulence intensity formed in the complex flow field of turbulence enhancement are investigated, observed and discussed at Reynolds number of 2,000, 3,000 and 5,000 by using PIV measurement, in results, the validity of ultrasonic to obtain the enhancement of turbulence is certified.
A Study on the Aerodynamic Design of Three-Dimensional Axial Type Turbine Blade
Jang, B.I. ; Kim, D.S. ; Cho, S.Y. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 38~47
One stage axial type turbine is designed by mean-line analysis, streamline curvature method and blade design method using shape parameters. Tip and hub diameter of the turbine are 300mm and 206.4mm, respectively. The rotating speed is 1800RPM, and the output power is 1.4kW. The flow coefficient is 1.68 and the reaction factor at mean-line is 0.373. The number of stator and rotor of the turbine are 31 and 41, respectively. Mach number of stator exit flow near hub is 0.164. A test rig is developed for performance test to validate a developed design method. The experimental result shows that the maximum efficiency is obtained on the design point.
A Study on the Estimation of Temperature in Track Components due to Hystresis Loss.
Kim, H.J. ; Kim, B.T. ; Baek, W.K. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 48~55
In many applications. rubber components undergo dynamic stresses or deformations of fairly large magnitude. Since rubbers are not fully elastic, a part of the mechanical energy is converted into heat due to the hysteresis loss. Heat generation without adequate heat dissipation leads to heat build up. i. e. internal temperature rise. The purpose of this paper is to predict temperature rise caused by the hysteresis loss, in a rubber pad subjected to complex dynamic deformation. In this unsteady thermal analysis, the temperature distributions of track components are displayed in contour shapes and the temperature variations of some important nodes are represented graphically with respect to the running time of the tank.
A Study on the Slitting Working by Finite Element Analysis
Han, K.T. ; Seo, J.K. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 56~63
A slitter is a sort of machinery to cut sheet materials in rolls continuously in the longitudinal direction. Recently slitter line users have requiring higher quality and precision in products in addition to high productivity. A finite element analysis has been performed to investigate the effect of processing factors on shear planes in the slitting of Shrinkage Band(S,K.B.). For the analysis, Hot-dip 55% aluminum-zinc alloy-coated steel sheets and coils(SAZCC) is selected as a material. The results obtained are that deformation was concentrated along the very narrow zone and the maximum slitting load decreases by increasing the knife clearance. Also effective strain decreases according to the clearance increases.
An Optimal Design of a Vertical Guide Bearing for Vibration Reduction
Ha, Hyun-Cheon ; Park, Chul-Hyun ; Kim, Hyung-Ja ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 64~72
This paper describes an optimal design technology in a segment type vertical guide bearing for vertical rotating machinery. Segment type vertical guide bearings have widely used for vertical rotating machinery, however bearing problems, such as excessive vibration and temperature rise, frequently take place in the actual machine. Such excessive vibration magnitude and/or abnormal bearing metal temperature rise result in serious damage and economic losses. Thus the segment type vertical guide bearing should be designed to get optimal characteristics in order to maintain stable operation without bearing failure due to abnormal vibration and/or abnormal bearing metal temperature. The preload ratio is the most important parameter in designing the segment type vertical guide bearing. Because adjustment of the bearing preload by changing the bearing clearance could easily control both the bearing stiffness and the cooling effect. In the paper, the influence of the preload effects on the bearing metal temperature and the bearing stiffness has been investigated both theoretically and experimentally in order to find out an optimum preload ratio. Results show that the segment type vertical guide bearing has an optimum preload ratio at which the bearing stiffness reaches a masimum value while the bearing metal temperature is minimized.
A Study on Tool Wear in Drilling STS 304 Steel Pipe Material
Mun, S.D. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 73~79
The purpose of this investigation is experimentally to clarify the machinability and tool wear of STS 304 steel pipe material for piping. In order to determine the effects of cutting parameters and tool wear on thrust, torque, AE RMS, drilling is conducted on CNC milling machine. In this experiment, it is measured that thrust, torque, tool wear length, tool wear area and AE RMS during drilling using Hss tool. It has been found that a) During the drilling, the thrust and the torque of the STS 304 pipe are received more the effect of the feed than the spindle speed and the thrust increase with the increase of feed, b) The value of the AE RMS is been larger the effect of the cutting speed than the feed rate, and the value of the AE RMS increase with the increase of spindle speed, c) It has been found that the suitable feed in feed condition of 0.03, 0.05, 0.1, 0.15mm/rev is below 0.05mm/rev, d) The value of the AE RMS was shown a characteristic of the jump value during it was a sudden inrcrease of the tool wear. The increased character of the AE RMS value can be known an effective factor of the tool wear detection, and e) It can be quantitatively evaluated the condition of the tool according to calculate a area of the drill wear image which is obtained by a vision system.
Effect of Bath Compositions and Plating Conditions for Decorative Properties of Chromium Deposits using Oxalic Acid
Oh, I.S. ; Park, J.D. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 80~87
Decorative properties of chromium depositions from oxalic acid bath containing chromium oxide and ammonium sulfate have been examined over a wide range of bath compositions and plating conditions. The obtained results from this experiment are summarized as follow: The followings were determined as a optimum conditions, bath compositions;
, and operation conditions; pH
, current density
at bath temperature range of
. Bright chromium deposits were obtained over a wide range of ammonium sulfate concentration and bath temperature. Decorative property for chromium deposition was adopted to apply stoichiometric ratio of
The Effect of Current on Characteristics of Stellite 12 Alloy Overlayer by PTA Process
Jung, B.H. ; Kim, M.K. ; Ahan, Y.S. ; Kim, M.Y. ; Lee, S.Y. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 88~94
Stellite 12 alloy-powders were overlaid on 410 stainless steel valve seat using plasma transferred arc(PTA) process. Variation of the microstructure, hardness, wear and corrosion of overlaid deposit with current change was investigated. The deposit showed hypoeutectic microstructure, which was consisted of primary cobalt dendrite and networked
type eutectic carbides. As current increased, the amount of eutectic carbide decreased and its dendritic secondary arm spacing increased. Hardness of the deposit was decreased with increase of current. Stress relief heat treatment at
for two hours resulted in slight increase of hardness in the deposit and showed uniform hardness distribution in base metal without any hardened layer in HAZ. Specific wear decreased with increase of sliding distance. The deposit of high hardness with a lot of eutectic carbide showed relatively low specific wear. Initial corrosion current density of the deposit in 0.1N sulfuric acid was lower than those of 410 stainless steel, and showed a little variation with PTA current.
A Study on Unified Vector Control of Induction Motor
Kim, Y.D. ; Lee, D.C. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 95~103
This study is applied to common induction motor, and vector control is realized by using an indirect type of induction motor which has a simple composition. In this study extended Kalman filter is used from control theoretical viewpoint, and primary resistance and secondary resistance which change according to the temperature of motor are simultaneously estimated. This paper aims to research an indirect vector control in which the secondary resistance obtained from this estimation is consistent with secondary flux. This estimation is made by on-line estimation, but on-line estimation is difficult because extended Kalman filter takes long time in computation time. So off-line estimation was made on the assumption that the variation of temperature in motor is slow temporally.
Precise Position Synchronous Control of Two-Axes System Using Two-Degree-of-Freedom PI Controller in BLDC Motor
Yoo, S.K. ; Jeong, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 5, issue 3, 2001, Pages 104~113
This paper describes a precise position synchronous control of two axes rotating system using BLDC motors and a cooperative control based on decoupling technique and PI control law. The system is required performances both good speed following and minimum position synchronous errors simultaneously. To accomplish these goals, the three kinds of controllers are designed. At first, the current and speed controller are designed very simply to compensate the influences of disturbances and to follow up speed references quickly. Especially, the two degree of freedom PI controller is used considering both good tracking for speed reference input and quick rejection of disturbances in speed controller. Finally, a position synchronous controller is designed as a simple proportional controller to minimize position synchronous errors. The validity of the proposed method is confirmed through some numerical simulations. Moreover, the results are compared to the conventional master-slave control ones to show the effectiveness of the proposed system.