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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 6, Issue 4 - Nov 2002
Volume 6, Issue 3 - Aug 2002
Volume 6, Issue 2 - May 2002
Volume 6, Issue 1 - Feb 2002
Selecting the target year
Status and Trends of Diesel Exhaust Fine PM(Particulate Matters) Reduction Technology
Lee, C.B. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 5~11
An Effect of Operating Conditions on Exhaust Emissions in a Small Turbocharged D.I. Engine
Jang, S.H. ; Koh, D.K. ; Ahn, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 12~17
Recently, the world is faced with very serious problems related to the air pollution due to the exhaust emissions of the diesel engine. So, many of researchers have studied to reduce the exhaust emissions of diesel engine. This study was investigated for various exhaust emissions according to operating conditions in a turbocharged D.I. diesel engine. As a result of experiments in a test engine, the
increased with increasing load, the
and CO decreased with increasing charge air pressure in manifold, the CO decreased with increasing cooling fresh water temperature, and the
decreased with worming cooling fresh water before engine start.
Emission Characteristics of Diesel Oxidation Catalysts for a Commercial Diesel Engine
Choi, B.C. ; Lee, C.H. ; Park, H.J. ; Jung, M.K. ; Kwon, G.M. ; Shin, B.S. ; Kim, S.S. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 18~23
Recently, as people pay attention to the environmental pollution, the emission of diesel engine has become a serious problem. Diesel Oxidation Catalysts(DOC) were experimentally investigated for the purification of pollutants exhaust emission from the diesel engine. In this study, the conversion efficiency of exhaust gas was investigated with various washcoat materials of the DOC. It was formed that CO conversion efficiency depended on temperature, but THC conversion was dominated by temperature and space velocity. Conversion efficiency of THC and CO increased with the addition of ZSM-5 in the washcoat, whereas these conversion efficiency decreased by adding Nd and Ba additives.
additive had the thermal stability for high temperature. Thermal durability of the catalyst was improved as increase of
Development of Rigidity and Frequency Analysis Program for Corrugated Plates
Kim, Young-Wann ; Chung, Kang ; Park, Kyung-Jo ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 24~32
A program is developed to analyze and design the frequency and rigidity of the corrugated plates with various corrugation shapes (the considered corrugation shapes are triangular and trapezoidal) and 36 kinds of boundary conditions using smeared theory. The system is consisted of input, solution and output routines, and its routine is made up pull-down menu type and run in Window basis using Visual Basic Language. The input routine helps the design engineers to make the input data user-friendly. The solution routine uses the homemade solver. In the output routine, automatic designs can be done using AutoCAD and Intent Tool package by interfacing the input data.
Ride Analysis of A Semi-Active Suspension Seat with Sky-Hook Control
Kang, T.H. ; Baek, W.K. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 33~39
Commercial vehicles are mostly subjected to relatively rougher ground environment than passenger vehicles. Many driver's seats of commercial vehicles have suspension system with spring and dampers. Then, impact or vibrative forces transmitted from the vehicle to the driver can be attenuated. This study deals with a ride evaluation method using sky-hook control algorithm for the suspension dampers. Vibration amplitude transmissibilities were compared between passive dampers and semi-active dampers with sky-hook control method.
Creep Life Prediction of Elevated Temperature Materials for Pressure Vessel by ISM
Kong, Y.S. ; Kim, H.K. ; Oh, S.K. ; Lim, H.K. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 40~47
In this paper, friction welding optimization for 1Cr0.5Mo-STS304 (
), AE applications for the weld quality evaluation and the applications of various life prediction methods such as LMP (Larson-Miller Parameter) and ISM (initial strain method) were investigated : The creep behaviors of those steels and the friction welded joints under static load were examined by ISM combined with LMP at 400, 500, 550 and
, and the relationship between these two kinds of phenomena was studied. The real-time predicting equations of elevated-temperature creep life (rupture time) under any creep stress at any elevated-temperature could be developed by LMP and LMP-ISM. It was confirmed that the life prediction equations by LMP and LMP-ISM are effective only up to 102 h and can not be used for long times of 103-106 h, but by ISM it can be used for long times creep prediction of more than 104 h with most reliability.
Friction Welding of Dissimilar Plunger Materials and Its Real Time Evaluation by AE
Kong, Y.S. ; Jo, S.K. ; Kim, Y.D. ; Oh, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 48~53
Plunger (piston rod) materials are used in high-pressure condition. So STD11 is the essential material to build this plunger. However, it costs more to make a plunger by using only STD11 than using the welding of STD11 to SCM440 and other dissimilar material. And it has been difficult to weld this sort of dissimilar materials. They could be unstable in the quality by the conventional arc welding. And also they have a lot of technical problems in manufacturing. But, by the friction welding technique, it will be able to be made without such problems. And then, on account of such reasons, we need a new approach of study on real-time quality evaluation by acoustic emission (AE) techniques as well as a domestic development of the plunger by friction welding. So that, the purpose of this study for such developments is the development of a plunger by optimizing of friction welding with more reliability and more applicability. Then, this study aimed not only to develop the optimization of friction welding of dissimilar plunger steels of STD11 to SCM440, but also to develop the application technique of the acoustic emission to accomplish an in-process real-time quality evaluation during friction welding of the plunger materials by the AE technique.
Influence of Injection Amount Variation on Surface Roughness at FDM
Ha, M.K. ; Jun, J.U. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 54~59
The principle of the FDM(fused deposition modeling) process is based on the layer by layer manufacturing technology, like other RP(rapid prototyping) process. In the FDM process, each layer may have different shape. Therefore, the built model may have stairs shape on its surface. This stairs shape is one of the serious problems in the FDM process. Thus in this study, cube models and spherical models were fabricated by FDM process to investigate the influence of injection amount on surface roughness. Models with various road width were also built to investigate the influence of road width on surface roughness. Surface roughness of the models was measured and analyzed. The result obtained in this study are expected to help selecting the part build orientation for optimum surface roughness.
Intelligent Diagnosis of Grinding State Using AE and Power Signals
Kwak, J.S. ; Ha, M.K. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 60~67
Optimization of Injection Molding of Bobbin Part based on CAE
Kwon, Y.S. ; Cho, Y.S. ; Kim, B.G. ; Min, B.H. ; Jeong, Y.D. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 68~72
Design of experiment was applied to analyze the shrinkage characteristics of the bobbin molded by injection molding. Among lots of design and processing conditions, the thickness of a bobbin and cooling conditions of a mold were considered. The temperature difference between top and bottom parts of the bobbin was considered as the objective to minimize the shrinkage of a bobbin. Optimal thickness of a bobbin was 2.0mm at the part of body and 1.5mm at the part of wing, respectively. Optimal cooling conditions such as cooling time and coolant inlet temperature were 12 second and
Analysis of Driving Performance for the Passenger Car Equipped with an Electronically Controlled Automatic Transaxle
Kim, S.I. ; Lim, W.S. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 73~81
In this study, electronically controlled automatic transmission adopted on a subcompact model in the market was modelled, and the driving performances of the transmission were simulated with the models. Kinetic and dynamic models of working components are established. The driving simulation program is developed with those models, and the various driving conditions are analyzed. With the results, the dynamic behaviour of the engine and the automatic transmission is easily understood. Especially, the transient performances of torque converter and clutches are deeply analyzed. Skipping the vehicle road test by using this analyzing tool, we can expect the cost down and the reduction of the development period of automatic transmission.
Dynamic Behavior of a Symmetric Cylinder Type Hydraulic Damper for Semi-Active Control
Lee, I.Y. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 2, 2002, Pages 82~87
For the dynamic behavior evaluation of a semi-active vibration control system, it is very important to use an accurate mathematical model for the hydraulic damper applied to the control system. In this study, a mathematical model for a symmetric type hydraulic damper was suggested. In this model, the effects of gas volume and oil temperature variation on the bulk modulus of oil were considered. The dynamic behavior of the damper was investigated by experiments and simulations. It was confirmed that the pressure variation, damping force, and mean pressure variation could be estimated with comparatively good precision by the suggested mathematical model. Moreover, it was shown that excessive pressure rise can be generated by the oil expansion due to the heat energy transformed from the exciting energy of the damper for a short period of the damper operation.