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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 2, Issue 3 - Dec 1998
Volume 2, Issue 2 - Sep 1998
Volume 2, Issue 1 - Jun 1998
Selecting the target year
Origin of the Modern Engineers
Yang, B.S. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 5~9
Trend of Hydraulic Servo Control Technology - Topics on Automobile Application -
Lee, I.Y. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 10~16
A Discussion of Combustion Regime Based on Laser Tomography and Flame Structure Diagram
Kim, J.H. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 17~24
The combustion regime was discussed using a laser tomography and flame structure diagram. It was shown first how to represent the turbulent burning velocity and flame structural parameters in the dimensionless plane referred to as the flame structure diagram. And then, turbulent flame structure from the obtained images by laser tomography was compared with combustion regime in the Re-Da plane, one of the diagrams, specified by different researchers. As the result, the
ratio at the boundary between the wrinkled laminar flame regime and reactant islands flame regime was found to be about 1.5.
A Study on the Droplet Size Distribution of Ultra High Pressure Diesel Spray on Electronic Hydraulic Fuel Injection System
Jang, S.H. ; Ahn, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 25~30
In order to investigate the droplet size distribution and Sauter Mean Diameter in a ultra high pressure diesel spray, fuel was injected with ultra high pressure into the environments of high pressure and room temperature by an Electronic Hydraulic Fuel Injection System. Droplet size was measured with the immersion liquid sampling technique. The immersion liquid was used a mixture of water-methycellulose solution and ethanol. The Sauter Mean Diameter decreased with increasing injection pressure, with a decrease environmental pressure (back pressure) and nozzle diameter. Increasing the injection pressure makes the fuel density distribution of the spray more homogeneous. An empirical correlation was developed among injection pressure, air density, nozzle diameter and the Sauter Mean Diameter of spray droplets.
Numerical Simulation of a Conical Diffuser Using the Nonlinear
Lee, Y.W. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 31~38
A diffuser, an important equipment to change kinetic energy into pressure energy, has been studied for a long time. Though experimental and theoretical researches have been done, the understanding of energy transfer and detailed mechanism of energy dissipation is unclear. As far as numerical prediction of diffuser flows are concerned, various numerical studies have also been done. On the contrary, many turbulence models have constraint to the applicability of diffuser-like complex flows, because of anisotropy of turbulence near the wall and of local nonequilibrium induced by an adverse pressure gradient. The existing
turbulence models have some problems in the case of being applied to complex turbulent flows. The purpose of this paper is to test the applicability of the nonlinear
model concerning diffuser-like flows with expansion and streamline curvature. The results show that the nonlinear
turbulence model predicted well the coefficient of pressure, velocity profiles and turbulent kinetic energy distributions, however the shear stress prediction was failed.
Computational Grid Generation for Aero-Performance Prediction of Multi-staged Axial Compressors
Chung, H.T. ; Kim, J.S. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 39~44
Computational grids used in the numerical simulation of multi staged turbomachinery flow fields are generated. A multiblock structure simplifies the creation of structured H-grids about complex turbomachinery geometries and facilitate the creation of a grid for multi-row topologies. The numerical algorithm adopts the combination of the algebraic and elliptic method to create the internal grids efficiently and quickly. The input module is made of the results of the preliminary design, i.e., flow-path, aerodynamic conditions along the spanwise direction, and the blade profile data. The final grids generated from each module of the system are used as the preprocessor for the performance prediction of the single row cascades and the flow simulation inside the multi staegd blade passage. Application to low pressure compressor of industrial gas turbine engines was demonstrated to be very reliable and practical in support of design activities.
Development of Analyzing Method for Pressure Fluctuations in Oil Hydraulic Pipe Network Including Flexible Hose Element
Lee, I.Y. ; Song, S.H. ; Jung, Y.G. ; Yang, K.W. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 45~51
An analyzing method for pressure fluctuations in oil hydraulic pipe network was developed in this study. The object pipe network has multi-branch configuration, and the pipelines of it are composed of metal tubes and flexible hoses. Transfer matrix method, in other words impedance method, was used for the analysis. Values of physical parameters describing the characteristics of flexible hose were measured by experiments and reflected to the analysing procedure. The reliability and usefulness of the analyzing method were confirmed by investigating computed results and experimental results got in this study.
Identification of Flexural Rigidity for Wire Rope Using Immune-Genetic Algorithm
Choi, B.G. ; Yang, B.S. ; Kil, B.L. ; Lee, S.J. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 52~58
An immune system has powerful abilities such as memory, recognition and learning to respond to invading antigens, and is applied to many engineering algorithm recently. In this paper, the combined optimization algorithm is proposed for multi-objective problem by introducing the capability of the immune system that controls the proliferation of clones to the genetic algorithm. The optimizing ability of the proposed algorithm is identified by using multi-peak function which have many local optimums and identification of the flexural rigidity for wire rope model.
Longitudinal and Flexural Vibration Analysis of a Beam Type Structure by Transfer Stiffness Coefficient Method
Moon, D.H. ; Choi, M.S. ; Kim, Y.B. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 59~66
The authors have studied vibration analysis algorithm which was suitable to the personal computer. Recently, we presented the transfer stiffness coefficient method(TSCM). This method is based on the concept of the transfer of the nodal dynamic stiffness coefficients which are related to force and displacement vectors at each node. In this paper, we describes the general formulation for the longitudinal and flexural coupled vibration analysis of a beam type structure by the TSCM. And the superiority of the TSCM to the finite element method(FEM) in the computation accuracy, cost and convenience was confirmed by results of the numerical computation and experiment.
Anti-sway Control of Crane System Using Hybrid Control Method
Park, H.S. ; Kim, H.S. ; Park, J.H. ; Lee, D.H. ; Kim, S.B. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 67~72
In crane control system, it is required that the travelling time of crane must be reduced as much as possible and there is no the swing of load at the end and starting points. In this paper, we present a hybrid control method which includes two control methods of the optimal regulator and the velocity pattern control in order to realize high performance of the anti-sway. To implement the control algorithm, the dynamic equation is linearlized at an equilibrium point, so that the linear time invariant state equation can be obtained. A 1/10 sized model crane of the usual gantry cranes is made and used to show the applicability of the developed hybrid control method. The effectiveness of developed hybrid control method is proved by experimental results which show us good performance for anti-sway control comparing to conventional velocity pattern control. Practically, it is expected that the proposed control system will make an important contribution to the automatic crane control system of the industrial fields.
Oscillation Motion Control of Gantry Crane System with Arm for Anti-Sway
Kim, H.S. ; Park, H.S. ; Lee, D.H. ; Park, J.H. ; Kim, S.B. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 73~79
In practical fields, the sway of crane systems leads to extra stress to the crane structure during the transporting operation and it is in close connection with its life. Usually, when we operate the cranes with high speed and manual control, the sway motion is irreducible. In this paper, a new type of crane system is proposed to avoid the irreducible sway of the crane systems. The proposed system is composed of mechanical arm with function of anti-sway based on conventional line system. By the anti-sway arm, we can realize to prevent the sway of the container box but cannot avoid the oscillation for the overall body of the crane. So, a controller design method to solve the above stated problem must be considered. The problem is solved by adopting the velocity pattern control methods of trapezoidal and curve types and its effectiveness is proved through experimental results.
Research of Shrinkage Phenomenon on Metal Insert Injection Molded Parts
Jeong, Y.D. ; Kim, Y.S. ; Kim, I.K. ; Jung, H.C. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 1, 1998, Pages 80~85
Engineering plastics have been magnified its usability due to its outstanding mechanic al, electrical and chemical properties, for example, in the area of computer, electricity, electronics, automobile, camera industry. In recent, automobile speedometer system is changing from manual operation to motor operation. All plastic gears inserted by metal shaft are used In motor operated speedometer system. Therefore, in this research, experimental investigation of the shrinkage phenomenon was executed according to various inserted depth and injection conditions. In experiments, the inserted depth was controlled as 30% and 90% of the total thickness of the plastic gear. The main parameters of injection process were selected as injection pressure, holding pressure, melt temperature, injection rate. As main results, free shrinkage rate of the test part is increased about 4 times to restricted shrinkage rate and shrinkage phenomenon against all injection conditions have a trivial effect on the test parts as conventional parts.