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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 14, Issue 6 - Dec 2010
Volume 14, Issue 5 - Oct 2010
Volume 14, Issue 4 - Aug 2010
Volume 14, Issue 3 - Jun 2010
Volume 14, Issue 2 - Apr 2010
Volume 14, Issue 1 - Feb 2010
Selecting the target year
Comparison of Numerical Methods on Heat Transfer in a Rod with Second Order-Boundary Value Problem
Kim, M.J. ; Chea, G.H. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 5~9
Collection Characteristics of Multi-layer Multi-stage Porous Plate System
Kim, I.K. ; Yoa, S.J. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 10~16
The main object of this study is to investigate the collection characteristics of multi-layer multi-stage porous plate system experimentally. The experiment is carried out to analyze the characteristics of pressure drop and collection efficiency for the present system with the experimental parameters such as inlet velocity, tube diameter, inlet concentration, and stage number, etc. In results, the pressure drop becomes 22 to
with increment of stage number (1 to 5) of porous plate system at tube velocity 15 m/s and tube diameter
. In case of fly ash and 5 stage, the collection efficiency becomes 90.5 to 95.7% increasing the tube velocity 12 to 15 m/s at inlet concentration
and tube diameter
. Additionally, it is estimated that the collection efficiencies of 5 stage are 94.3, 95.6 and 99.1% for fly ash, steel dust and based power, respectively (
= 12m/s, inlet concentration
Evaluation of Material Properties about CFRP Composite Adapted for Wind Power Blade by using DIC Method
Kang, J.W. ; Kwon, O.H. ; Kim, T.K. ; Cho, S.J. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 17~23
In recent, the capacity of a commercial wind power has reached the range of 6 MW, with large plants being built world-wide on land and offshore. The rotor blades and the nacelle are exposed to external loads. Wind power system concepts are reviewed, and loadings by wind and gravity as important factors for the mechanical performance of the materials are considered. So, the mechanical properties of fiber composite materials are discussed. Plain woven fabrics Carbon Fiber Reinforced Plastics (CFRP) are advanced materials which combine the characteristics of the light weight, high stiffness, strength and chemical stability. However, Plain woven CFRP composite have a lot of problems, especially delamination, compared with common materials. Therefore, the aim of this work is to estimate the mechanical properties using the tensile specimen and to evaluate strain using the CNF specimen on plain woven CFRP composites. For the strain, we tried to apply to plain woven CFRP using Digital Image Correlation (DIC) method and strain gauge. DIC method can evaluate a strain change so it can predict a location of fracture.
Study on Shock Resistance Design of TFT-LCD Module using Explicit Impact Analysis
Kim, J.G. ; Lee, J.K. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 24~29
TFT-LCD module with thin, small and layered structure makes its shock analysis very difficult and complicated. As TFT-LCD becomes more thinner, it is more difficult to assure its required shock resistance. Recently, the drop/impact simulation using the commercial explicit dynamic analysis software such as LS-DYNA3D is actively applied to assess the shock characteristics of TFT-LCD. In this study, the effects of analysis parameters and design modifications in the drop/impact simulation are carefully studied. the reliability of the present analysis results can be assured through the experimental verification.
Study on Optimum Design Condition for Variable Speed Control of Rated Speed Fans used in a Power Plant
Cho, C.W. ; Yang, K.H. ; Jung, N.K. ; Kim, B.J. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 30~35
Recently, the large capacity draft fans in power plants had been changed to variable speed type to educe the power consumption. But the fan experienced the unexpected vibration at specific speed regions. In this study, the high vibration frequency of the fan was confirmed and the natural frequency of the rotor were measured and analyzed by FEM programs. It was analyzed that the vibration was caused by the resonance at the frequency, 30.7Hz. So, the rotor vibration characteristic was changed by adjusting the distance between the shaft bearings. It was conformed the high vibration was disappeared over the all operation speeds.
Application of Guided Ultrasonic Wave Technology for Evaluation of Welding Part in Cooling Water Pipe
Gil, D.S. ; Ahn, Y.S. ; Park, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 36~40
The ultrasonic guided wave propagates along with the given structure's wall direction. Because of this specific character, the ultrasonic guided waves arc used in many other fields. Especially, it can be readily utilized for nondestructive inspection of various structures that are made up of gas pipes, heat exchanger tubes, and thin plates. Further, the guided wave technology can be readily utilized when inspecting pipes or thin plates which pose high risk of the accident but for which the nondestructive inspection itself is impossible because it is difficult to get to them since they are coated or buried underground. In the other hand, conventional ultrasonic testing such as thickness gauging uses bulk waves and only tests the region of structure immediately below the transducer. As a result of the application about inlet and outlet cooling water line using guided wave test, we conformed that the overall corrosions were in the lower side of the 304.8 mm inlet valve and these corrosions were engaged in not locally but through the lower side of the valve line. In the near future, we can expect that the detectable defect size is smaller than before along with the development of the sensing technology.
Thin Micro-Porous Scaffold Layer on Metallic Substrate
Sin, D.C. ; Miao, X. ; Kim, W.C. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 41~47
A Hydroelastic Response Analysis of Ships with Forward Speed in Regular Waves
Lee, S.C. ; Bae, S.Y. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 48~55
When a large ship is advancing in waves, ship undergoes the hydroelastic response, which has influences on structural stability and the fatigue destruction etc. of the ship. Therefore, to predict accurate hydroelastic response, it is necessary to analyze hydroelastic response including fluid-structure interaction. In this research, a ship is divided into many hull elements to calculate the fluid forces and wave exciting forces on each elements using three-dimensional source distribution method. The calculated fluid forces and wave exciting forces are assigned to nodes of hull elements. The neighbor nodes are connected with elastic beam elements. We analyzed hydroelastic responses, and those are formulated by using finite element method. Particularly, to estimate the influence of forward speed on the hydroelastic responses, we use two different methods : Full Hull Rotation Method(FHRM) and Sectional Hull Rotation Method(SHRM).
Improvement Noise Attenuation Performance of the Active Noise Control System Using RCMAC
Han, S.I. ; Yeo, D.Y. ; Kim, S.H. ; Lee, K.S. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 56~62
In this paper, a recurrent cerebellar modulation articulation control (RCMAC) has been developed for improvement of noise attenuation performance in active noise control system. For the narrow band noise, a filter-x least mean square (FXLMS) method has bee frequently employed as an algorithm for active noise control (ANC) and has a partial satisfactory noise attenuation performance. However, noise attenuation performance of an ANC system with FXLMS method is poor for broad band noise and nonlinear path since it has linear filtering structure. Thus, an ANC system using RCMAC is proposed to improve this problem. Some simulations in duct system using harmonic motor noise and KTX cabin noise as a noise source were executed. It is shown that satisfactory noise attenuation performance can be obtained.
Anti-Pinch System for Power Window by Using Hall Sensor
Kim, S.H. ; Jeong, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 63~70
Recently the power window system is widely used in automobiles to increase convenience of passengers and drivers. However some accidents or injuries have been caused by malfunction or misusage of the system. Therefore safety regulations of the system to cope up with these accidents have been strengthened gradually in many countries. Especially in America, since 2005, all vehicles which had power window system should be contented with FMVSS 118-S5 regulations. We suggest very low-cost anti-pinch window control system satisfying the regulation in this paper. Hall sensors are used and installed around a motor rotor with ring magnet to detect motor speed for anti-pinch. The optimum number of hall sensor and location angel of them are mainly investigated to get sufficient speed resolution for anti-pinch. Through some experiments, the validity of the suggested system was verified to satisfy the regulation.
A Study on the Simulation of Leak Flow-rate Using Isothermal Chamber
Ji, S.W. ; Jang, J.S. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 71~75
Leak detection technology is a challenging research until nowadays, because it has wide and various applications in industry. Furthermore pneumatic component reliability test based on ISO requires air leakage measurement. The conventional measurement methods need a complex operation and the calibration of leak detector. Tracing the history of our study, we proposed a new method for measurement of leak flow rate using isothermal chamber. In this study, propose a simulation model of isothermal chamber by infinitesimal flow -rate, such as a leak flow-rate. The effectiveness of the proposed simulation model is proved by simulation and experimental results. Base on the comparison results, proposed simulation model is good agreement with experimental results.
Experimental Study for Investigating the Optimum Operating Conditions of a Seawater Ice Machine
Li, H. ; Joo, W.J. ; Jeong, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 14, issue 5, 2010, Pages 76~82
This paper investigates the optimum operating conditions to construct total automatic control system with high energy efficiency of a newly developed seawater ice machine. The machine has an electronic expansion valve(EEV) and a variable speed rotating drum with an evaporator installed inside. The coefficient of performance(COP) was used as an index to evaluate energy efficiency of the machine. At first, the opening angle of EEV was adjusted to obtain COP of the machine at a constant speed of the drum. Then, we checked seawater ice product versus opening angles of the EEV. Finally, effect of drum's rotating speed in response to product of seawater ice and seawater ice temperature were considered.