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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
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Volume & Issues
Volume 16, Issue 6 - Dec 2012
Volume 16, Issue 5 - Oct 2012
Volume 16, Issue 4 - Aug 2012
Volume 16, Issue 3 - Jun 2012
Volume 16, Issue 2 - Apr 2012
Volume 16, Issue 1 - Feb 2012
Selecting the target year
Design of Loss-reduction Mechanisms for Energy Recovery Devices in Reverse-osmosis Desalination systems
Ham, Y.B. ; Kim, Y. ; Noh, J.H. ; Shin, S.S. ; Park, J.H. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 3, 2012, Pages 5~9
DOI : 10.9726/kspse.2012.16.3.005
Novel mechanisms for Energy Recovery Devices are proposed to diminish the pressure loss in the high-pressure reverse-osmosis system. In the beginning, the state-of-the-art in the design of Energy Recovery Devices is reviewed and the features of each model are investigated. The direct-coupled axial piston pump(APP) and axial piston motor(APM) showed 39% energy recovery at operating pressure of reverse osmosis desalination systems, 60 bar. Meanwhile, the developed PM2D model, in which APM pistons are arranged parallel to those of APP, is more compact and showed higher efficiency in a preliminary test. Loss-reduction mechanisms employing rod piston and double raw valve port are additionally proposed to enhance the efficiency and durability of the device.
Effects of Fuel Injection Timing on Combustion Characteristics of Biodiesel Blend Oil in Diesel Engine
Lim, J.K. ; Cho, S.G. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 3, 2012, Pages 10~15
DOI : 10.9726/kspse.2012.16.3.010
Recently we have a growing interest in environmental pollution and alternative energy. Diesel engine is generally used to produce the power on the ground and the sea. However, the combustion characteristics are changed on account of the wear of fuel system and the altered ambient condition of the combustion chamber by the increment of the engine operation hour. Therefore combustion characteristics on fuel injection timing are experimentally investigated to find out the optimum fuel injection timing in the case of the aged diesel engine using biodiesel blend oil. Cylinder pressure, rate of pressure rise, rate of heat release and combustion gas temperature are risen by the advancing fuel injection timing, while the exhaust gas temperature and soot emission level are decreased by the advancing of fuel injection timing. The least specific fuel oil consumption is indicated at BTDC
CA on the 75%load and at 1800rpm.
The Characteristics on the Engine Performance for Variation of Fuel Injection Timing in DI Diesel Engine Using Biodiesel Fuel
Jang, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 3, 2012, Pages 16~21
DOI : 10.9726/kspse.2012.16.3.016
Biodiesel is technically competitive with or offers technical advantages over conventional petroleum diesel fuel. Biodiesel is an environmentally friendly alternative liquid fuel that can be used in any diesel engine without modification. In this study, to investigate the effect of fuel injection timing on the characteristics of performance with DBF in DI diesel engine. The engine was operated at five different fuel injection timings from BTDC
intervals and four loads at engine speed of 1800rpm. As a result of experiments in a test engine, maximum cylinder pressure is increased with leading fuel injection timing. Specific fuel oil consumption is indicated the least value at BTDC
of fuel injection timing.
Dynamic Response Analysis of a Flexible Rotor During Impact on Backup Bearings
Park, K.J. ; Bae, Y.C. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 3, 2012, Pages 22~28
DOI : 10.9726/kspse.2012.16.3.022
Active magnetic bearings(AMBs) present a technology which has many advantages compared to traditional bearing concepts. However, they require backup bearings in order to prevent damages in the event of a system failure. In this study, the dynamics of an AMB supported rotor during impact on backup bearings is studied employing a detailed simulation model. The backup bearings are modeled using an accurate ball bearing model, and the model for a flexible rotor system is described using the finite element approach with the component mode synthesis. Not only the influence of the support stiffness, clearance and friction coefficient on the rotor orbit, but also bearing load are compared for various rotor system parameters. Comparing these results it is shown that the optimum backup bearing system can be applicable for a specific rotor system.
Computational Flow Analysis on the Flow Field Improvement of an Indoor RAC by LES
Kim, J.K. ; Oh, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 3, 2012, Pages 29~36
DOI : 10.9726/kspse.2012.16.3.029
The computational flow analysis using LES technique was introduced to investigate the flow field improvement of an indoor RAC chassis consisting of a rear-guider, a stabilizer and a cross-flow fan. This unsteady three-dimensional numerical analysis was carried out by the commercial SC/Tetra software. The edge blocks were adopted in this study as a tool for the flow field improvement of an indoor RAC. In view of the results so far achieved, the edge blocks cause the center of an eccentric vortex to be stable along all length of a cross-flow fan, and then, the static pressure and the velocity vector show a stable distributions. In consequence, because the edge blocks eliminate a reverse flow near the edges, an exhausting flow becomes to be stable and uniform.
A Study on the Visualization of Temperature Field Using Neural Network
Lee, C.J. ; Bae, D.S. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 3, 2012, Pages 37~43
DOI : 10.9726/kspse.2012.16.3.037
Investigation into the Worst Stress Condition for an Accelerated Life Test of a Compressor in Refrigerators - Acceleration Factor and the Reducible Test Time under High Temperature -
Jung, Y.M. ; Joo, W.J. ; Jeong, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 3, 2012, Pages 44~50
DOI : 10.9726/kspse.2012.16.3.044
The reliability qualification test is essential in order to ensure the life time of the product under the normal operation conditions when a new product is developed. The reliability qualification test period has an important impact on the development time of new product. Therefore, some researches to reduce the test time of reliability qualification test have been actively studied. Generally, accelerated life test is well known as one method that can save the test time of the reliability qualification test. This test is conducted under the higher stress condition than normal condition. So we need to investigate what factor affects to the higher stress condition. This paper shows the relationship between the acceleration factor and reliability qualification test period. Especially, we focused on the method to obtain effective acceleration factors under the high temperature condition. Through some experiments for a refrigerator`s compressor, we were able to confirm how to increase acceleration factors and how to reduce the reliability qualification test period with minimum samples.
Effect of Deformation Induced Martensite Transformation on the Mechanical Properties in Austenitic Stainless Steel with High Mn
Hur, T.Y. ; Han, H.S. ; Lee, S.H. ; Kang, C.Y. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 3, 2012, Pages 51~56
DOI : 10.9726/kspse.2012.16.3.051
The effect of deformation induced martensite transformation on the mechanical properties in austenitic stainless steel with high Mn was studied.
`-martensite was formed by deformation in austenitic stainless steel with high Mn. Deformation induced
`-martensite was formed with surface relief by cold rolling. With the increase of deformation degree, volume fraction of deformation induced martensite was increased rapidly in early stage of deformation and then, increased slowly. With the increase of deformation degree, hardness and tensile strength were rapidly increased with linear relations, while elongation was rapidly decreased and then slowly decreased. Hardness, tensile strengths and elongation were influenced strongly by deformation induced martensite.
Unified Motion and Force Control of JS-10 Robot Manipulator Based on Operational Space and 3D CAD
Ahn, D.S. ; Nguyen, Van Phuc ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 3, 2012, Pages 57~63
DOI : 10.9726/kspse.2012.16.3.057
Mathematical Modeling about Magnetic Attractive Force of Magnetic Bearing
Choi, G.H. ; Yang, J.H. ; Choung, K.G. ;
Journal of the Korea Society For Power System Engineering, volume 16, issue 3, 2012, Pages 64~68
DOI : 10.9726/kspse.2012.16.3.064
Because the magnetic bearing supports levitating body without contact, wear, noise and vibration are very small comparing with mechanical bearings, it is very useful to high revolution machinery. In general, the magnetic attractive force function that is proportional to square of control current(x), and inversely proportional to square of an air gap(i) has been widely used. This paper proposed the new magnetic attractive force function that is proportional to cube of the control current, and inversely proportional to square of the air gap. The function was optimized to minimize the cost function that is the percentage of deviation about the change of a proportional constant(k), using the experimental data, ie, control currents and air gaps.