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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 4, Issue 4 - Nov 2000
Volume 4, Issue 3 - Aug 2000
Volume 4, Issue 2 - May 2000
Volume 4, Issue 1 - Feb 2000
Selecting the target year
Nondestructive Evaluation on Safety Assurance of Structures and Defects(II) - Mechanics of defects -
Nam, K.W. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 2, 2000, Pages 5~10
A Study on Natural Convection Flows Using Particle Image Analysis
Bae, D.S. ; Kim, N.S. ; Cho, W.H. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 2, 2000, Pages 11~16
Simultaneous quantitative measurements are made of the velocity fields for two-dimensional natural convection in a rectangular enclosure using PIV(Particle Image Velocimetry). The experiments are performed at a Prandtl number of 6.62, an aspect ratio of 1.0, Rayleigh numbers from
, and angles of inclination of
cavity made of an acrylic glass 10mm, with two isothermal copper walls kept at a prescribed temperature. The experimental results agreed very well with the numerical results. It was found that the flow consisted of a large double convection cell at angle of inclination of
Fully Developed Turbulent Flow in Roughened Concentric Annuli : Experiment and Analysis
Ahn, S.W. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 2, 2000, Pages 17~24
Development of Intelligent Trouble-Shooting System for Grinding Operation
Ha, M.K. ; Kwak, J.S. ; Park, J.W. ; Yoon, M.C. ; Koo, Y. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 2, 2000, Pages 25~30
The grinding process is very complex and relates many parameters to control the process. As this reason, a theoretical analysis and a quantitative estimation of the grinding process has not been well established. In this study, the in-process monitoring system was suggested by applying the neural network for monitoring and shooting the malfunction of cylindrical plunge grinding process. This system used the power signals from the electric power meter. This neural network was composed of processing elements [4-(5-5)-3] with 4 identified power parameters. Because sensitivity is blunted some minute vibration components, the simulation result of this system has appeared about 10% erroneous recognition in the uncertain pattern and the average success rate of the trouble recognition was about 90%. Consequently, the developed system, which applied to the power signals, can be recognize enough to monitor the grinding process as in-process.
Effect of Plating Condition and Surface on Electroless Co-Cu-P Alloy Plating Rate
Oh, L.S. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 2, 2000, Pages 31~39
Relationships between the plating condition and the plating rate of the deposition film for the electroless plating of Co-Cu-P alloy were discussed in this report. The result obtained from this experiment were summarized as follow ; The optimum bath composition was consisted of 0.8 ppm thiourea as a stabilizing agent. Composition of the deposit was found to be uniform after two hours of electroless plating. Plating rates of nickel-catalytic surface and zincate-catalytic surface were found to be very closely equal, but the plating time of nickel-catalytic surface took longer than that of the zincated-catalytic surface.
Effect of Spatial Distribution of Material Properties on its Experimental Estimation
Kim, S.J. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 2, 2000, Pages 40~45
Some engineering materials are often known to have considerable spatial variation in their resisting strength and other properties. The objective of this study is to investigate the averaging effect and the applicability of extremal statistic for the statistical size effect. In the present study, it is assumed that the material property is a stationary random process in space. The theoretical autocorrelation function of the material strength are discussed for several correlation lengths. And, in order to investigate the statistical size effect, the material properties was simulated by using the non-Gaussian random process method. The material properties were plotted on the Weibull probability papers. The main results are summarized as follows: The autocorrelation function of the material properties are almost independent of the averaging length. The variance decreases with increasing the averaging length. As correlation length is smaller, the slope is larger. And also, it was found that Weibull statistics based on the weakest-link model could not explain the spatial variation of material properties with respect to the size effect satisfactory.
Finite Element Analysis for the Contact Stress of CPF Pin Inserted into the Rigid PTH
Kim, B.T. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 2, 2000, Pages 46~51
The contact stress characteristics of the domestic CPF pin when inserted into the rigid PTH was analyzed using the finite element method. The model geometry was based on the shape of the existing pin and the two different PTH diameters were used in the analysis. The stress distributions with respect to the friction coefficients were compared and the stress variations of the compliant part of the pin, which have an influence on the performance, were displayed with the time and the arc length on complete connection.
Fatigue Crack Propagation Behavior of 316L Stainless Steel and Frequency Characteristics of its Acoustic Emission
Lee, S.K. ; Do, J.Y. ; Nam, K.W. ; Kang, C.Y. ; Ahn, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 2, 2000, Pages 52~57
We investigated the fatigue crack propagation of base metal, weld metal and heat attected zone in 316L stainless steel. And we analysed acoustic emission signals during the fatigue test by time-frequency analysis method. The specimens of weld metal and HAZ had longer fatigue life and slower rate of crack propagation better than base metal. And as a result of time-frequency was 200-300 kHz was obtained by fatigue crack propagation and 500 kHz was obtained by dimple and separate of inclusion.
A Method of a Nonlinear Position Control of a Pneumatic Cylinder
Jang, J.S. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 2, 2000, Pages 58~64
A method for the position control of a pneumatic cylinder using a linearized controller is proposed. Pneumatic cylinder has highly nonlinear characteristics and modelling of the system has been difficult. Compliance of the pneumatic cylinder is materially changed according to the operating position. So, in the case that fixed gain controller obtained by a linearized model at a specified position is used, response of the cylinder should be changed according to the operating position. In order to get a designed results regardless of operating positions, a controller for compensation of the nonlinear characteristic with a linearlization compensator is designed and simulation results show that this method is appropriate for the control object.
Shimmy Analysis Program Development of Steering System for a Passenger Car
Park, S.K. ; Song, S.K. ; Lee, Y.H. ; Song, K.K. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 2, 2000, Pages 65~70
The shimmy phenomenon, or the radial vibration of steering wheel, happens frequently at a high speed, complicated with suspension system, steering system, vehicle body, engine, transmission and tire. In this study, the suspension system and steering system are modeled by the reference of vehicle body design coordinates(T.L.H), the coordinate system usually used by passenger car maker. In addition, the theoretical results from numerical method have been investigated and compared with the experimental ones by the correlating analysis between the tire and sub-system. The steering and suspension system modeled for the numerical analysis are both independent type. This study developed an analysis program which could forecast the shimmy level in advance by the variation of properties in each system and the change in design of new model.
Model Updating Using Sensitivity of Frequency Response Function
Kim, K.K. ; Kim, Y.C. ; Yang, B.S. ; Kim, D.J. ;
Journal of the Korea Society For Power System Engineering, volume 4, issue 2, 2000, Pages 71~76
It is well known that finite element analysis often has the inaccuracy when they are in conflict with test results. Model updating is concerned with the correction of analytical model by processing records of response from test results. This paper introduce a model updating technique using the frequency response function data. The measurement data is able to be used directly in the FRF sensitivity method because it is not necessary to identify. When a damping model is updated, it is necessary for the sensitivity matrix to be divided Into the complex part and real part. As an applying model, a cantilever and a rotor system are used. Specially the machined clearance(
) of the journal bearing is updated.