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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 14, Issue 6 - Dec 2010
Volume 14, Issue 5 - Oct 2010
Volume 14, Issue 4 - Aug 2010
Volume 14, Issue 3 - Jun 2010
Volume 14, Issue 2 - Apr 2010
Volume 14, Issue 1 - Feb 2010
Selecting the target year
Basic Study on the Application of a Computational Technique to Behavior Characteristics Analysis of the Evaporative Diesel Spray
Yeom, J.K. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 5~12
In this study, an analysis of evaporative diesel spray and an usefulness of a general-purpose program, ANSYS CFX release 11.0, are investigated through the comparison and investigation of the experimental results carried out under an evaporative field, in which there is phase transition, by an exciplex fluorescence method and the results analyzed by the CFX program. The diesel fuel called n-Tridecane,
, is injected from a single-hole nozzle (l/d=1.0mm/0.2mm) into a constant volume chamber under a high temperature and pressure. In the same condition as the experimental condition, the analysis was carried out. Both results of the spray tip penetration were almost coincident at each time. The results have validated the usefulness of this analysis. As a result, if the ambient pressure is high, the spray tip penetration will be shortened and move toward the nozzle exit.
Characteristics of Adsorption, Desorption of Exhaust Gases and Deactivation of LNT and SCR Catalysts for Diesel Vehicles
Seo, C.K ; Kim, H.N. ; Choi, B.C. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 13~19
Computational Flow Analysis of a Cross-Flow Fan by LES
Kim, J.K. ; Oh, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 20~28
The computational flow analysis using LES technique was carried out to investigate the flow characteristics of a RAC chassis consisting of a rear-guider, a stabilizer and a cross-flow fan. The commercial SC/Tetra software was used in this analysis. In view of the results so far achieved, the distribution trends of static pressure and velocity vector of central region except the edges of a CFFan are similar regardless of the number of revolution, and an eccentric vortex exists around the bottom blade of a CFFan. Also, a reverse flow is found in the region between stabilizer and CFFan. Moreover, near the edges of a CFFan, an eccentric vortex is separated to two vortexes. Also these vortexes increase the velocity near a rear-guider, and guide the flow near a rear-guider into stabilizer inlet. Therefore, the reverse flow region is formed in the bottom of a CFFan.
Study on Characteristics of Low Cycle Fatigue for High Alloy and Austenite Stainless Steel
Kim, Y.C. ; Back, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 29~34
As the steam temperature of fossil power plant boiler is increasing, the use of 9Cr-1Mo high alloy material is prevalent and it is needed to investigate the characteristics of low cycle fatigue for high alloy and austenite stainless steel that has used up to recently. As a result of test, in 9Cr-1Mo high alloy steel, the relation of strain and fatigue life is non-linear and the crack mode of low cycle fatigue is brittle but in the austenite stainless steel, that of strain and fatigue life is linear and the crack mode of low cycle fatigue is ductile. Comparing the fatigue life between high alloy and austenite stainless steel, there is no consistent characteristics as to strains. But the fatigue life of 9Cr-1Mo steel is longer by 25% than that of STS304 stainless steel in the relatively low, 0.3% strain. In the other strain, the fatigue life of two materials is similar.
Axial Stiffness Analysis of a Clutch Diaphragm Spring in Passenger Cars
Kim, J.Y. ; Kim, J.G. ; Yoon, H.J. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 35~40
This article deals with the numerical analysis results of stiffness of diaphragm spring used in the clutch of a manual transmission. In order to investigate the relationship of the force and displacement in a diaphragm spring, we have established a numerical model of diaphragm spring using a well-known analytic model of Belleville spring and a cantilever beam model for the finger part of diaphragm spring. Using the stress and strain relations of Belleville spring and cantilever beam, we propose the analytic equation of motion of diaphragm spring for the use of a clutch automated actuator in an automated manual transmission. The proposed analytic model represents the typical dynamic characteristics of diaphragm spring along with the release bearing travel. And it is characterized in a closed-form equation, therefore it can be used for the further study of development of actuator and control law of clutch automating mechanism.
AE Signal Characteristic Analysis caused by Crack Growth
Kim, W.C. ; Kim, J.G. ; Gu, D.S. ; Kim, H.J. ; Choi, B.K. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 41~46
Acoustic emission (AE) technique is a well-known non-destructive test technique. Fatigue crack growth test was performed using SM53C to check up the AE signal occurred by crack growth, so AE system was used to detect the crack signal. Features calculated by the AE signals were analyzed to evaluate the steps divided the crack growth into three. The steps, initiation, growth and breaking, were separated by velocity of the crack growth. Time waveform and power spectrum were created by the AE signal of each one of the steps and compared. In the feature domains, it was found that AE values changed rapidly as the velocity of the crack increasing.
Analyzing Materials Property using Optical Sensing Technique of Stabilizer Link for Automobile Parts
Nam, K.W. ; Woo, Y.M. ; Oh, J.H. ; Moon, C.K. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 47~53
A stabilizer link connects the stabilizer bar to the lower arm of the suspension. When a vehicle is turning, lateral forces from the tire are transmitted through the stabilizer link into the stabilizer bar. The stabilizer bar will twist, thus adding rigidity to the vehicle body. In this study, the stabilizer link body was manufactured by using composite material with POM-GF25%. Therefore, the strength evaluation of stability link body with composite material carried out from tensile, wear and fatigue test. The tensile strength between the stability link body with composite material and the rod with knurling was the largest of four types of rod. In Analyzing materials property using optical sensing technique of stabilizer link for automobile parts, its has been identified the safety.
Finite Element Analysis for the Swaging Process of an Automotive Air-conditioning Hose Assembly
Baek, J.K. ; Kim, B.T. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 54~60
The automotive air conditioning hose is used for connecting the components of air conditioner in a vehicle. The hose is usually manufactured by the swaging process to connect the rubber hose with the metal fitting at the end of the hose. The swaging process leads to various stress and strain configurations in the hose, which give a critical effect on the hose performance. In this paper, the deformation characteristics of an air-conditioning hose during the swaging process were analyzed using the nonlinear finite element method. Especially the rubber layers, which are contacted with the metal fittings, were divided with finer mesh density than the reinforcement braids to increase the solution accuracy. The material properties were obtained from experimental data, and the contact conditions were used in consideration of the real manufacturing process.
Reliability Assessment of Elevators Using Life Data of the Components
Sohn, S.H. ; Sohn, H.J. ; Kim, S.J. ; Yang, B.S. ; Yoon, M.C. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 61~66
Engineering asset management (EAM) requires the accurate assessment of current and the prediction of future asset health condition. Suitable mathematical models that are capable of predicting time-to-failure and the probability of failure in future time are essential. In general reliability models, lifetime of component and system is estimated using failure time data. This paper deals with the reliability assessment of elevators using life of main components. Especially this work is concerned with the stochastic nature of life of elevator components. First, we investigate the Weibull statistical analysis of lifetime data for the components. The final goal is to establish the mathematical model for reliability assessment. This work provides more perspectives to future research in the fields of reliability and maintainability.
A Study on Vibration Characteristics in Water Tank with Multi-panels
Bae, S.Y. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 67~74
Many tanks are installed in ship and marine structures. They are often in contact with inner or outer fluid, like ballast, fuel and cargo tanks. Fatigue damages are sometimes observed in these tanks which seem to be caused by resonance with exciting force of engine and propeller. Vibration characteristics of these thin walled tanks in contact with fluid near engine and propeller are strongly affected by added mass of containing fluid. Therefore it is essentially important to estimate the added mass effect to predict vibration of the tanks. Many authors have studied vibration of cylindrical and rectangular tanks containing fluid. Few research on dynamic interaction among tank walls through fluid are reported in the vibration of rectangular tanks recently. In case of rectangular tanks, structural coupling between adjacent panels and effect of vibration modes of multiple panels on added mass have to be considered. In the previous report, A numerical tool of vibration analysis of a 3-dimensional tank is developed by using finite element method for plates and boundary element method for fluid region. In this paper, the coupling effect between panels of a tank on added mass of containing fluid, the effect of structural constraint between panels on each vibration mode for fluid region and mode characteristics in accordance with changing breadth of the plates are investigated numerically and discussed.
Time Domain Analysis of Nonlinear Wave-Making Problems by a Submerged Sphere Oscillating with Forward Speed
Ha, Y.R. ; Bae, S.Y. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 75~82
In this study, the topics for free-surface wave simulation, nonlinear hydrodynamic force, and the critical resonance frequency of so-called
=1/4 are discussed. A high-order spectral/boundary element method is newly adapted as an efficient numerical tool. This method is one of the most efficient numerical methods by which the nonlinear gravity waves can be simulated and hydrodynamic forces also can be calculated in time domain. In this method, the velocity potential is expressed as the sum of surface potential and body potential. Then, surface potential is solved by using the high-order spectral method and body potential is solved by using the high-order boundary element method. By the combination of these two methods, the wave-making problems by a submerged sphere oscillating with forward speed under the free-surface are solved in time domain.
Wear Properties of Epoxy Matrix Nanocomposites
Kim, J.D. ; Kim, H.J. ; Koh, S.W. ; Kim, Y.S. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 83~88
The wear behavior of epoxy matrix composites filled with nano sized silica particles is discussed in this paper. Especially, the variation of the coefficient of friction and the wear resistance according to the change of apply load and sliding velocity were investigated for these materials. Wear tests of pin-on-disc mode were carried out and the wear test results exhibited as following ; The epoxy matrix composites showed lower coefficient of friction compared to the neat epoxy through the whole sliding distance. As increasing the sliding velocity the epoxy matrix composites indicated lower coefficient of friction, whereas the neat epoxy showed higher coefficient of friction as increasing the sliding velocity. The specific friction work of both materials were increased with apply load. In case of the epoxy matrix composites, the running in periods of friction were reduced as increase in apply load. The epoxy matrix composites were improved the wear resistance by adding the nano silica particles remarkably. It is expected that the load carrying capacity of the epoxy matrix composites will be improved by increase of Pv factor.
Design of PI and Feedforward Controller for Precise Temperature Control of Oil Cooler System
Byun, J.Y. ; Jeong, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 89~95
This paper deals with design method of proportional-integral(PI) and feedforward controller for obtaining precise temperature and high energy efficiency of oil cooler system in machine tools. The compressor's speed and opening angle of an electronic expansion valve are controlled to keep reference value of temperature at oil outlet and superheat of an evaporator. Especially, the feedforward controller is added to suppress temperature fluctuation under abrupt disturbances. Through some experiments, the suggested method can control the target temperature within steady state error of
and maximum overshoot
under abrupt disturbances.
A Development of Constrained Control Allocation for Ship Berthing by Using Autonomous Tugboats
Bae, H.M. ; Bui, V.P. ; Lee, S.S. ; Kim, Y.B. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 96~101
Basic Characteristics of a Two Stage Directional Control Valve with Pilot Spool Assembled in Main Spool Coaxially
Lee, I.Y. ; Son, J.M. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 6, 2010, Pages 102~108
In this study, the authors investigate the basic characteristics of a two stage directional control valve with pilot spool assembled in main spool coaxially. The step response characteristics and effects of major design parameters' values on valve performances arc clarified through numerical simulations. In addition, the authors examined the possibility of applying the object valve for this study as a proportional control valve. Based on the numerical simulation results, new design values for the reformed design as a proportional control valve were suggested.