Go to the main menu
Skip to content
Go to bottom
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 8, Issue 4 - Nov 2004
Volume 8, Issue 3 - Aug 2004
Volume 8, Issue 2 - May 2004
Volume 8, Issue 1 - Feb 2004
Selecting the target year
Characteristics on the Pressure Variations According to the Exhaust Pipe Shape of 4-Stroke Gasoline Engine
Lee, H.D. ; Choi, S.C. ; Koh, D.K ; Lee, C.J. ; Jeong, H.M. ; Chung, H.S. ;
Journal of the Korea Society For Power System Engineering, volume 8, issue 1, 2004, Pages 13~17
In this study. an experimental study has been introduced for the various exhaust pipe geometry of 4-stroke single cylinder engine. The main experimental parameters are the variation of exhaust pipe diameters and lengths to measure the pulsating flow when the intake and exhaust valves are working. As the results of experimental test, the various exhaust geometry were influenced strongly on the exhaust pressure. As the exhaust pipe diameter was decreased, the amplitude and the number of compression wave in exhaust pressure was increased. According to decreasing pipe diameter, the number of compression wave in exhaust pressure was decreased.
The Effect of EGR on Exhaust Emissions in a Direct Injection Diesel Engine
Jang, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 8, issue 1, 2004, Pages 18~23
The direct injection diesel engine is one of the most efficient thermal engines. For this reason DI diesel engines are widely used for heavy-duty applications. But the world is faced with very serious problems related to the air pollution due to the exhaust emissions of diesel engine. So, that is air pollution related to exhaust gas resulted from explosive combustion should be improved. Exhaust Gas Recirculation(EGR) is a proven method to reduce NOx emissions. In this study, the experiments-were performed at various engine loads while the EGR rates were set from 0% to 20%. The emissions trade-off and combustion of diesel engine are investigated. Hot and cooled EGR are achieved without cooling and with cooling respectively. It was found that the exhaust emissions with the EGR system resulted in a very large reduction in oxides of nitrogen at the expense of higher smoke emissions. Also, the reduction rates of NOx emissions for hot and cooled EGR are similar at load 20%.
Pressure Predictions in Exhaust Pipe of a Single Cylinder Gasoline Engine
Choi, S.C. ; Lee, H.J. ; Kim, S.H. ; Koh, D.K. ; Jeong, H.M. ; Chung, H.S. ;
Journal of the Korea Society For Power System Engineering, volume 8, issue 1, 2004, Pages 24~29
In this study, a computer analysis has been developed for predicting the pipe pressure of the intake and exhaust manifold. To obtain the boundary conditions for a numerical analysis, one dimensional and non-steady gas dynamic calculation is performed by using the MOC(Method Of Characteristic). The main numerical parameters are the variation of the engine revolution to calculate the pulsating flow which the intake and exhaust valves arc working. The comparison of exhaust pressure in case of numerical results is quite matched with in case of experimental results. When engine revaluation is increased, the pressure amplitude showed a high value, but the pressure frequency was decreased.
Numerical Analysis on Effect of the Environmental Velocity for Circular Heating Source with Heat Generation
Bae, K.Y. ; Ji, M.K. ; Chung, H.S. ; Chung, H.T. ; Jeong, H.M. ;
Journal of the Korea Society For Power System Engineering, volume 8, issue 1, 2004, Pages 30~35
This paper represents the numerical analysis on effect of the environmental velocity for circular heating source with heat generation. In general heating system, the oil and sheath heater is widely used, but these systems have many problems. So, the heating source with carbon ingredient has been researched in many country about manufacture, thermal and electrical properties. In this research, a circular heating source was studied through numerical analysis on several conditions of unsteady state, beat generation and environmental velocity. The temperature distributions at steady state is appeared as a non-linear pattern with variations of environmental velocity. So, the correlation equation between temperature at steady state and environmental velocity was obtained.
Two-Phase Flow Characteristics in an Adiabatic Horizontal Tube
Choi, B.H. ;
Journal of the Korea Society For Power System Engineering, volume 8, issue 1, 2004, Pages 36~40
Two-phase loop systems using the latent heat capacity of their working fluids can meet the increasing power requirements and are well suited to thermal management systems of future large applications, due to its abilities to handle large heat loads and to provide them at uniform temperatures regardless of the changes in the heat loads. Therefore some experiments on the effect of the gas and liquid superficial velocities,
on flow pattern transition, void fraction and frictional pressure loss were performed on a co-current air-water flow in an adiabatic horizontal tube. The flow patterns were depended on the superficial velocity of each phase. It snowed that the increasing
, resulted in a significant increase in the frictional pressure loss for all flow patterns, at a constant
. The experimental results were also evaluated with some of existing models and correlations.
An Experimental Study on the Water Evaporation Conditions of the Enclosed Tank
Kim, S.H. ; Shin, Y.S. ; Lee, Y.W. ; Chung, H.S. ; Jeong, H.M. ;
Journal of the Korea Society For Power System Engineering, volume 8, issue 1, 2004, Pages 41~47
Cooling towers are widely used not only for cooling products and equipment in manufacturing process but HVAC(Heating, Ventilation and Air Conditioning) system. As a cooling tower is the terminal apparatus which discharges heat from industrial process, the efficiency of heat exchange in the cooling tower greatly affects to the overall performance of a thermal system. In this paper, we constituted a new water cooling system by using a Latent heat of evaporation in an enclosed tank, and this system is consisted of an enclosed vacuum tank and water driven ejector system. Several experimental cases were carried out for improvement methods of high vacuum pressure and water cooling characteristics. The ejector performance was tested in case of water temperature variations that flows into the ejector. Based on the vacuum pressure by water driven ejector, the water cooling characteristics were investigated for the vaporized air condensing effects.
A Study on Unused Energy Management of Jeju City Waste Environment Center
Kim, S.H. ; Kwon, K.R. ; Park, Y.C. ;
Journal of the Korea Society For Power System Engineering, volume 8, issue 1, 2004, Pages 48~54
In this study, waste heat of Jeju City Waste Environment Center is investigated and the utilization method is suggested with economical analysis of additional investment that needed for new facility. Energy balance of the typical facilities is considered in this study such as incineration plant and LFG power plant. The payback period of the investment which is used for the LFG power plant waste heat utilization facility is about 2.4 years and the economic profit of the facility during 10 years operation is up to 926 million won.
A Study on Swing Motion Control System Design for the Spreader of the Crane with Varying Rope Length
An, S.B. ; Chae, G.H. ; Kim, Y.B. ;
Journal of the Korea Society For Power System Engineering, volume 8, issue 1, 2004, Pages 55~61
In general, the swing motion of the crane is controlled and suppressed by activating the trolley motion. In this paper, we suggest a new type of anti-sway control system of the crane. In the proposed control system, a small auxiliary mass(moving-mass) is installed on the spreader and the swing motion is controlled by moving the auxiliary mass. The actuator reaction against the auxiliary mass applies inertial control forces to the container in order to reduce the swing motion in the desired manner. In this paper, we apply the
based control technique to the anti-sway control system design problem. And the experimental result shows that the proposed control system is useful and robust to disturbances like winds and initial sway motion.
A Fault Tolerant Control for Distributed Programmable Logic Controller System
Jeong, S.K. ; Jeong, Y.M. ;
Journal of the Korea Society For Power System Engineering, volume 8, issue 1, 2004, Pages 62~68
This paper describes a fault tolerant control in distributed PLC(Programmable Logic Controller) system to ensure reliability of controllers which have some faults simultaneously. First, the behavior of PLC is modeled as discrete expressions using Galois field. Then, we design the control laws for additional spare controllers to generate parity code with two dimensions. Finally, the algorithm for estimating normal output instead of abnormal output from the controllers with fault is suggested. Comparing to the traditional duplication method, the suggested method can reduce the number of spare controllers significantly to ensure control reliability. This method will be applied to an automatic system in order to increase reliability. Also, it can improve cost performance of the system.
Structure-Control Combined Optimal Design with S/A Collocation
Park, J.H. ;
Journal of the Korea Society For Power System Engineering, volume 8, issue 1, 2004, Pages 69~74
A structure-control combined optimal design problem is discussed taking a 3-D truss structure as a design object. We use descriptor forms for a controlled object and a generalized plant because the structural parameters appear naturally in these forms. We consider not only minimum weight design problem for structure system, but also suppression problem of the effect of disturbances for control system as the purpose of the design. A numerical example shows the validity of combined optimal design of structure and control systems. We also consider the validity of sensor-actuator collocation for control system design in this paper.