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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
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Journal DOI :
The Korea Society for Power System Engineering
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Volume & Issues
Volume 12, Issue 6 - Dec 2008
Volume 12, Issue 5 - Oct 2008
Volume 12, Issue 4 - Aug 2008
Volume 12, Issue 3 - Jun 2008
Volume 12, Issue 2 - Apr 2008
Volume 12, Issue 1 - Feb 2008
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An Effect of the 2nd Land Length of a Piston on Thermal Stress
Kwon, Y.W. ; Park, S.C. ;
Journal of the Korea Society For Power System Engineering, volume 12, issue 2, 2008, Pages 5~11
An analytical study was performed to have temperature and thermal stress distribution on a piston with the change of the 2nd land length of a piston and the existence of knocking in a cylinder. The result showed that the temperature on the skirt region was about
higher than that on the pin region. However the thermal stress on the skirt region was about 4MPa lower than on the pin region. It may be due to the higher heat release rate on the pin boss than on the skirt. The result regarding the variation of the 2nd land length of the piston showed that the temperature distribution on the piston was getting lower and the thermal stress distribution was getting higher as the 2nd land length of the piston was shorter.
The Combustion Characteristics of Biodiesel Fuel as an Alternative Fuel for D.I. Diesel Engine
Jang, S.H. ; Suh, J.J. ;
Journal of the Korea Society For Power System Engineering, volume 12, issue 2, 2008, Pages 12~17
Biodiesel fuel(BDF) which is easily produced from vegetable oils such as soybean oil and rice bran oil can be effectively used as an alternative fuel in diesel engine. But biodiesel fuel can affect the performance and emissions in diesel engine because it has different chemical and physical properties from diesel fuel. To investigate the combustion characteristics of biodiesel fuel as an alternative fuel for D.I. diesel engine, the experiments were carried out at the three-cylinder, four stroke D.I. diesel engine with T/C. Experimental parameters adopted a conventional diesel fuel and a blend of biodiesel fuel derived from soybean. As a result of experiments in a test engine, BSFC with blend of BDF resulted in higher than with diesel fuel. The ignition delay decreased with blend of BDF than with diesel fuel.
A Diagnosis and Solution Case of Structural Vibration caused by Pipe
Lee, J.H. ; Gu, D.S. ; Choi, B.K. ;
Journal of the Korea Society For Power System Engineering, volume 12, issue 2, 2008, Pages 18~22
A few intake stations have vibration problems caused by pipes. The vibration transffered from pipes excites building severely. Therefore, the crack is generated on building wall and people who work at intake station are damaged. In this paper, the vibration is measured and analysis is carried out for pipes at intake station in order to identify the usefulness and effectiveness of the solution proposed for pipe resonance avoidance. According to the result of analysis, the vibration of pipes is reduced by bellows.
Analysis of Mount Reaction Forces for Powertrain Mounting Systems using Nonlinear Characteristics
Kim, J.H. ; Lee, S.J. ; Lee, W.H. ; Kim, J.R. ;
Journal of the Korea Society For Power System Engineering, volume 12, issue 2, 2008, Pages 23~28
The primary objective of this study is to truly understand reaction force be due to engine exciting force. Exciting forces of the engine apply a source of the vehicle NVH(Noise, Vibration, Harshness). To understand reaction force was applied MSC.Nastran software. Analyzed frequency response analysis of powertrain mount system. First, engine exciting force was applied field function. Also nonlinear characteristics was applied field function : such as dynamic spring constant and loss factor. And nonlinear characteristics was applied CBUSH. Generally characteristics of rubber mount is constant frequency. But characteristics of hydraulic mount depend to frequency. Therefore nonlinear characteristics was applied. Powertrain mounting system be influenced by powertrain specification, mount position, mount angle and mount characteristics etc. In this study, we was analyzed effects of powertrain mounting system. And we was varied dynamics spring constant and loss factor of mounts.
Study on Dynamic Characteristics of Curved Bellows
Hwang, J.P. ; Kim, J.G. ; Park, Y.K. ;
Journal of the Korea Society For Power System Engineering, volume 12, issue 2, 2008, Pages 29~34
Bellows is widely used in many industrial fields as it provides a relatively simple means of absorbing mechanical shock, vibration and thermal deformation with flexibility. In this study, the inherent dynamic characteristics of curved bellows are numerically studied according to the variation of angle, curvature and crest density, etc. For these numerical studies, a parametric finite element modelling program of curved bellows is constructed using ANSYS APDL. The validity of numerical results obtained from ANSYS software is experimentally verified using the test model made by RP machine SLA 5000.
Vibration Characteristics of Conical Shells with Linearly Varying Thickness
Yeo, D.J. ; Cho, I.S. ;
Journal of the Korea Society For Power System Engineering, volume 12, issue 2, 2008, Pages 35~40
This paper deals with the free vibrations of conical shells with linearly variable thickness by the transfer influence coefficient method. The classical thin shell theory based upon the Flugge theory is assumed and the governing equations of a conical shell are written as a coupled set of first order matrix differential equations using the transfer matrix. The Runge-Kutta-Gill integration method is used to solve the governing differential equation. The natural frequencies and corresponding mode shapes are calculated numerically for the conical shells with linearly variable thickness and various boundary conditions at the edges. The present method is applied to conical shells with linearly varying thickness, and the effects of the semi-vertex angle, the number of circumferential waves and thickness ratio on vibration are studied.
Stress Analysis of the S-CVT using Finite Element Method
Kim, J.Y. ;
Journal of the Korea Society For Power System Engineering, volume 12, issue 2, 2008, Pages 41~47
This article deals with the stress analysis of the friction drive, which transmits the power via the rolling resistance on the contract area between the two rotating bodies. On the contact area, friction drives are normally involved with shear stress due to the transmitted force, as well as normal stress. Thus the stress analysis including the shear stress is necessary for the design of the friction drive. Hertzian results can be used to estimate the normal stress distribution and elastic deflection of the contact area, although the shear stress distribution is not well defined. In order to investigate the shear stress distribution and its effects in a friction drive, we have performed the stress analysis of the spherical continuously variable transmission(CVT) using finite element method. The spherical CVT is one of friction drives, which is used in small power applications. The numerical results show that the normal stress distribution is not affected by the transmitted shear force, and the maximal shear stress is increased in small amount along with the shear force.
A Study on the Mechanical Properties of Underwater Wet Arc Welds using the SM41
Kim, C.G. ; Kwak, H.W. ; Kim, M.N. ;
Journal of the Korea Society For Power System Engineering, volume 12, issue 2, 2008, Pages 48~54
Underwater wet arc welds of rolled steel plate (SM41) where studied welding and mechanical properties macro and narrow than that of the other things. Tensile strength of UWEB obtained to 521.5 MPa and of USBL was 524.1 MPa, but the highest elongation value was 4.68 %(UWEB). Bending strength(1166.6 MPa) of USBL is the largest and of UWEB in 1047 MPa, But deflection(22.73 mm) of UWEB in large than that of USBL(22.63 mm). Impact value(144.36
) of JPUW is the largest and of UWEB(140
) come after.
Optimal Excitation Trajectories for the Dynamic Parameter Identification of Industrial Robots by Using Combined Model
Park, K.J. ;
Journal of the Korea Society For Power System Engineering, volume 12, issue 2, 2008, Pages 55~61
This paper discusses the advantages of using Fourier-based periodic excitation and of combining internal and external models in dynamic robot parameter identification. Internal models relate the joint torques or forces with the motion of the robot; external models relate the reaction forces and torques on the bedplate with the motion data. This combined model allows to combine joint torque/force and reaction torque/force measurements in one parameter estimation scheme. This combined model estimation will yield more accurate parameter estimates, and consequently better predictions of actuator torque, which is shown by means of a simulated experiment on a CRS A465 industrial robot.
Numerical Analysis of Proportional Pressure Control Valve using Bondgraph
Yang, K.U. ; Hue, J.K. ;
Journal of the Korea Society For Power System Engineering, volume 12, issue 2, 2008, Pages 62~70
The paper made a description of the method for numerical analysis and modeling of a proportional pressure control valve by bondgraph. The valve is a three port pressure regulator valve, consists of two subsystems; a proportional solenoid and a spool assembly. A purpose of this study is to analysis the dynamic characteristics of the valve using bondgraph method and to verified results that each of parameters has an effect on modeling. It considered the effect which the presence of solenoid, flow coefficient and non-linearity of resistance causes in the valve modeling. In particular, it is analyzed the effect that the solenoid interacted with modeling results and characteristics of the nonlinear resistance through orifice on the supply and discharge side of valve. Thus this paper described method to present nonlinear characteristics by bondgraph modeling method, so that we could know easily result that each parameters has an effect on the modeling.