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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 17, Issue 6 - Dec 2013
Volume 17, Issue 5 - Oct 2013
Volume 17, Issue 4 - Aug 2013
Volume 17, Issue 3 - Jun 2013
Volume 17, Issue 2 - Apr 2013
Volume 17, Issue 1 - Feb 2013
Selecting the target year
Nano Fluid and its Application in Mechanical Devices
Jeong, Hyo-Min ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 5~11
DOI : 10.9726/kspse.2013.17.4.005
Power Reduction Cooling System using Outdoor Air
Kim, Young-Min ; Yoon, Jung-In ; Son, Chang-Hyo ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 12~16
DOI : 10.9726/kspse.2013.17.4.012
A Study on the Power Plant Application of Engine Condition Diagnosis Technology for Diesel Generator
Choi, Kwang-Hee ; Lee, Sang-Guk ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 17~22
DOI : 10.9726/kspse.2013.17.4.017
Diesel generator of nuclear power plant has a role for supply of emergency electric power to protect reactor core system in event of loss of off-site power supply. Therefore diesel generator should be tested periodically to verify the function that can supply specified frequency and voltage at design power level within limited time. For this purpose, appropriate maintenances in case that abnormal conditions were found are required in allowed time. In this paper, results of development of engine condition diagnosis technology and study on power plant of its technology for diesel generator are described.
Study on the Effect of the Payload and Weight Position on the Handling and Ride Comfort of a Truck
Cha, Hyun-Kyung ; Choi, Gyu-Suk ; Sohn, Jeong-Hyun ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 23~30
DOI : 10.9726/kspse.2013.17.4.023
In this paper, the payload condition is considered and computer simulation is carried out to analyze the dynamic behavior of the middle-sized truck under the condition with different weight and location. The computer model for the truck is established and ADAMS/Car is employed to simulate the truck vehicle. A single lane change and bump-pass simulation are performed to evaluate the performance according to the weight and the position of it. Effects of the location and weight of commercial vehicle are analyzed. According to the simulation results, the front deck is preferred as the load location.
Development of Ultrasonic Sensor for Engine Condition Diagnosis of EDG
Lee, Sang-Guk ; Choi, Kwang-Hee ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 31~35
DOI : 10.9726/kspse.2013.17.4.031
The emergency AC power supply system of the nuclear power plant is designed to supply the power to the nuclear power plant at the emergency operating condition. The safety function of the diesel generator at the nuclear power plant is to supply AC electric power to the safety system whenever the preferred AC power supply is unavailable. The reliable operation of onsite standby diesel generator should be ensured by a condition monitoring system designed to maintain, monitor and forecast the reliability level of diesel generator. The purpose of this paper is to improve the existing ultrasonic sensor used for condition diagnosis of engine fuel pump and cylinder head for the accurate diagnosis in actual engine condition of emergency diesel generator(EDG). As a result of this study, we could design and develop much more reliable ultrasonic sensor than existing ones.
Experimental Study on the Aerodynamic Performance of a Cross-Flow Fan for the Various Curvature Radius of a Rear-Guider for a Room Air-Conditioner
Kim, Jang-Kweon ; Oh, Seok-Hyung ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 36~44
DOI : 10.9726/kspse.2013.17.4.036
The aerodynamic performance of a cross-flow fan is strongly influenced by the various design factors of a rear-guider and a stabilizer. The design factors considered in this paper are a rear-guider clearance, a stabilizer clearance, and a stabilizer setup angle, respectively. Also, these factors are given to the various diameter ratio between a basic circle and a impeller. The static pressure and the flowrate of a cross-flow fan were measured with a fan-tester. It could be found that the useful design factors with a good aerodynamic performance exist in the certain assembly conditions of an indoor RAC. Therefore, it could be known that a new published patent determining the easy design of an indoor RAC can be applied in a variety of goods.
Heat Transfer and Pressure Drop Characteristics of Secondary Refrigerants Applying to Indirect Refrigeration System
Oh, Hoo-Kyu ; Son, Chang-Hyo ; Jo, Hwan ; Yi, Wen-Bin ; Jeon, Min-Ju ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 45~50
DOI : 10.9726/kspse.2013.17.4.045
This paper presents the comparison of heat transfer and pressure drop of various secondary refrigerants (single-phase and two-phase) in the indirect refrigeration system. The main results were summarized as follows: In case of heat transfer, it is useful to use secondary refrigerants in low evaporating temperature region and the heat transfer coefficient of single-phase is larger than two-phase secondary refrigerants. In case of pressure drop, it is useful to use secondary refrigerants in high evaporating temperature region and the pressure drop of two-phase is smaller than single-phase secondary refrigerant. Also,
is the best useful because pressure drop of
among the secondary refrigerants is the smallest.
Flow Characteristic with Distance of Inlet Port and Rotating Length of Fluid in the Double Heat Exchanger
Lee, Seung-Ha ; Cha, Dong-An ; Kwon, Oh-Kyung ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 51~57
DOI : 10.9726/kspse.2013.17.4.051
The length and position of the inlet port on the double tube heat exchanger is analyzed by CFX ver.11 for studying the characteristic of its flow distribution. When the boundary conditions of the inlet temperature and mass flow rate were each
and 10 ~ 50 kg/min, 3 models that are based on the distance between the inlet port and the center of the heat exchanger(0, 5.025, 10.05 mm) were analyzed to find the uniformity of the flow rate. Based on the flow rate, 4 lengths (23.723, 33.890, 44.057, 57.274 mm) were used to study the flow distribution according to Reynolds Number. The results show that, when the distance from the inlet to the position of the center of the heat exchanger is 10.05 mm and the length is 57.274 mm, the flow distribution is the most unified.
Effect on Heat Exchangers Efficiency on Performance of Cryogenic Refrigeration Cycles
Yoon, Jung-In ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 58~63
DOI : 10.9726/kspse.2013.17.4.058
This paper presents the new cascade liquefaction cycles using
. The performance of the cascade liquefaction cycles with respect to temperature differences in the LNG heat exchangers is analyzed using HYSYS software and then compared the performance of these cycles with phillips optimized cascade liquefaction cycle. The coefficient of performance of the new liquefaction cycles considered in this study decreases with the temperature differences in the LNG heat exchangers, but the compressor work, expander work and heat capacity in the LNG heat exchanger increases, respectively. From the comparison of performance of three cycles, the cascade liquefaction cycles using
showed the highest COP. And the cycles using
presented the second and third highest COP, respectively. In the view of performance, the optimized cascade liquefaction cycle using
yields much better COP. But, in the environment view, it is found that the cascade liquefaction cycle using
shows favorable characteristics.
Thermal and mechanical analysis on friction stir welding of AZ31 magnesium alloy by the finite element method
Kang, Dae-Min ; Park, Kyoung-Do ; Jung, Yung-Suk ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 64~71
DOI : 10.9726/kspse.2013.17.4.064
In this paper, finite element method was used for flow and strength analysis of AZ31 magnesium alloy under friction stir welding. The simulations were carried out by SYSWELD s/w, and the modeling of sheet was doned by unigraphics NX3 s/w. Welding variables for analysis were rotating speed and welding speed of tool. Also two-way factorial design method was applied to confirm the effect of welding variables on maximum temperature and stress of material used. From these results, the increaser welding speed of tool the decreaser maximum temperature, but the increaser maximum stress. Also the increaser rotating speed of tool the increaser maximum temperature, but the decreaser maximum stress. In addition the increaser welding speed of tool and the decreaser rotating speed of tool, the narrower heat effect zone. Finally rotating speed of tool influenced on maximum temperature more than welding speed of tool, and welding speed of tool influenced on maximum stress more than rotating speed of tool from the variance analysis.
Ultrasonic Characteristics of Degraded Compacted Graphite Iron from 873 to 1,273 K
Lee, Soo-Chul ; Nam, Ki-Woo ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 72~78
DOI : 10.9726/kspse.2013.17.4.072
Compacted graphite iron 340 was carried out the heat treatment from 873 to 1,273 K. Compacted graphite iron 340 was evaluated relationship between the sound velocity, the attenuation coefficient and the tensile strength. The obtained results are as following. The signal strength of C scan images were weak according to increasing of heat treatment temperature and time. The amplitude of A scan and B scan was also low. This can be cause that the graphite was grown into the type of vermicular, and the many of grain boundary with ultrasound scattering were increase. The sound velocity was depend upon the heat treatment temperature and time, the attenuation coefficient had nothing to do with the temperature and time. The higher the heat treatment temperature, the tensile strength and the sound velocity were decreased. However, the tensile strength was proportional to the sound velocity. The higher tensile strength, the faster the sound velocity.
Effect of Fusing Treatment on Anti-Corrosion Characteristics of Ni-based Self-flux Alloy Coating
Kim, Tae-Yong ; Kim, Jae-Dong ; Kim, Yeong-Sik ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 79~85
DOI : 10.9726/kspse.2013.17.4.079
This study aims at investigating the effect of a fusing treatments on anti-corrosion characteristics of Ni-based self-flux alloy coating. Ni-based coatings were fabricated by flame spray process on steel substrates, and fusing treatments were performed using a vacuum furnace at
. After fusing treatments, corrosion tests were carried out using potentiostat/galvanostat at solution with pH 2 and pH 6. Corrosion potential(Ecorr) and corrosion current density(Icorr) could be analyzed from polarization curve. Fusing-treated coating at
showed more favorable anti-corrosion characteristics than as-sprayed coating. Anticorrosive effect of fusing-treated coating at solution with pH 2 was relatively greater than at solution with pH 6. Fusing-treated coating at
showed the most excellent anti-corrosion characteristics.
Statistical Distribution of Fatigue Crack Growth Rate for Friction Stir Welded Joints of Al7075-T651
Ahn, Seok-Hwan ; Kim, Seon-Jin ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 86~93
DOI : 10.9726/kspse.2013.17.4.086
This paper deals with the effects of driving force and material properties on statistical distribution of fatigue crack growth rate (FCGR) for the friction stir welded joints of Al 7075-T651 aluminum plate. In this work, the statistical probability distribution of fatigue crack growth rate was analyzed by using our previous constant stress intensity factor range controlled fatigue crack growth test data. As far as this study are concerned, the statistical probability distribution of fatigue crack growth rate for the friction stir welded (FSWed) joints was found to evaluate the variability of fatigue crack growth rate for base metal (BM), heat affected zone (HAZ) and weld metal (WM) specimens. The probability distribution of fatigue crack growth rate for FSWed joints was found to follow well log-normal distribution. The shape parameter of BM and HAZ was decreased with increasing the driving force, however, the shape parameter of WM was decreased and increased with increasing the driving force. The scale parameter of BM, HAZ and WM was increased with the driving force.
Bending Strength and Crack Healing of SiC
/SiC Composite Material
Ahn, Seok-Hwan ; Do, Jae-Yoon ; Moon, Chang-Kwon ; Nam, Ki-Woo ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 94~102
DOI : 10.9726/kspse.2013.17.4.094
composites by NITE method was investigated fracture characteristics according to the size of the surface crack. Coated surface crack with a
colloid in several ways was evaluating the possibility of healing. The strength of CCS and UCS is 313 and 230MPa, respectively and it is about 1/3 of the SPS. Bending strength of
composites has no effect with the pre-crack size to the critical crack size.
composites can not generate large amount of
oxides to the bottom of crack, and is only generated randomly on surfaces, and can not contribute to the recovery of bending strength.
Effect of Solution Annealing on the Microstructure and Mechanical Properties of Modified 440A Martensitic Stainless Steel
Kim, Young-Chul ; Kwon, Soon-Doo ; Jung, Byong-Ho ; Kang, Chang-Yong ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 103~108
DOI : 10.9726/kspse.2013.17.4.103
This study was investigated the effect of austenitizing treatment the microstructure and mechanical properties in modified 440A steel, and the results were as follows. The amount of remaining carbide decreases with increasing the austenitizing treatment temperature, and all carbide is completely dissolved at
. The amount of remaining carbide decreases with increasing the austenitizing treatment time, but the carbide remains insoluble up to 120 minutes at
. The strength and hardness gradually decrease with increasing the austenitizing treatment temperature and is significantly lower at
, while the elongation and the impact value rapidly increase. The strength and hardness rapidly decrease, the elongation and impact value rapidly insrease with increasing the austenitizing treatment time and exhibit no change at above 120 minutes. The austenitizing treatment modified 440A steel is required for temperature of above
and time of above 60 minutes.
Heat Resistance Properties of Thin Section HiSiMo Ductile Iron for Exhaust Manifold
Lee, Do-Kyung ; Kim, Sung-Gyu ; Lee, Byung-Woo ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 109~114
DOI : 10.9726/kspse.2013.17.4.109
In this study, the microstructure, mechanical properties and high temperature oxidation characteristics of HiSiMo and HiSiMoM ductile iron for exhaust manifold were investigated. The HiSiMoM ductile iron was developed by optimization of alloying element addition and casting design. The exhaust manifold prototype was fabricated using the HiSiMoM iron and this resulted in the weight saving of 0.73kg. The microstructures of the HiSiMo and HiSiMoM irons were similar each other and graphite nodularity was 89% and 93% respectively. Tensile strengths of them were 663.5 and 674.4 MPa and Brinell hardness were 235.3 and 243.9 respectively. Both irons showed parabolic weight gain behavior in high temperature oxidation atmosphere. Oxidation layer was divided into external and internal layers. The weight gain of the HiSiMoM iron was lower than that of the HiSiMo iron after isothermal oxidation test at
. This should be rationalized by higher Si enrichment at the interface of the matrix and internal layer of the HiSiMoM iron.
Evaluation on Strength Characteristics of Automobile Steel Sheet by Electrode Resistance Spot Weld
Yoon, Han-Ki ; Hu, Kwan-Do ; Ryu, Deok-Seang ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 115~119
DOI : 10.9726/kspse.2013.17.4.115
The resistance spot welding of high strength steel degrades the weldability because of its high strength with rich chemical composition and coating layer to protect from corrosion. And the weld Expulsion is prone to occur and severely affect the nugget guality when the initial gap between automatic borrowing galvanied steel sheets(SGARC35) and Zn-coateel trip steels(GA580TRIP and GA980 TRIP) exist in resistance spot welding(RSW). RSW is one of the most popular welding processes used to join sheet metals. but weld guality sometimes do creases due to welding condition. in this paper to verity tue weldability using spot welding with the hemispherically concaved electrode, tensile shear strength and cross-tensile strength were measured by a universal test machine. in addition, the nugget size on cross-sectional area of the weld was observed by optical and electron microscopy. As a result, the nugget size of this specimen is increased with increasing welding current and Max load of tensile-shear strength is increased with welding current is increasing.
A Position Control of EHA Systems using Adaptive PID Sliding Mode Control Scheme
Lee, Ji-Min ; Park, Sung-Hwan ; Park, Min-Gyu ; Kim, Jong-Shik ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 120~130
DOI : 10.9726/kspse.2013.17.4.120
An adaptive PID sliding mode controller is proposed for the position control of electro-hydrostatic actuator(EHA) systems with system uncertainties and saturation in the motor. An EHA prototype is developed and system modeling and parameter identification are executed. Then, adaptive PID sliding mode controller and optimal anti-windup PID controller are designed and the performance and robustness of the two control systems are compared by experiment. It was found that the adaptive PID sliding mode control system has better performance and is more robust to system uncertainties than the optimal anti-windup PID control system.
Evaluation Standard of Cost-Effectiveness Analysis for Renew of Architectural Equipment in Public Building
Jung, Soon-Sung ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 131~138
DOI : 10.9726/kspse.2013.17.4.131
The purpose of this study is to suggest the evaluation standard of cost-effectiveness analysis for renew of architectural equipment in public building. Evaluation items of cost-effectiveness analysis for renew of architectural equipment in public building were used life cycle cost, energy consumption(ton of oil equivalent), green house gas emissions(ton of carbon dioxide) and maximum power demand. Life cycle cost is the process of making an economic assessment of an item, area, system, or facility by considering all significant costs of ownership over an economic life, expressed in terms of equivalent costs. The essence of life cycle costing is the analysis of equivalent costs of various alternative proposals. The social concern with green house gas and maximum power demand of architectural equipment field has been growing for the last several years.
Control of Magnetic Bearing using ATmega128(Focused on experiments)
Yang, Joo-Ho ; Choi, Gyo-Ho ; Choung, Kwang-Gyo ;
Journal of the Korea Society For Power System Engineering, volume 17, issue 4, 2013, Pages 139~146
DOI : 10.9726/kspse.2013.17.4.139
Because the magnetic bearing supports levitating body without contact, wear, noise and vibration, it is very useful to high revolution machinery. In this paper we selected ATmega 128, a less expensive and widely used micro controller, for control the magnetic bearing system. And we selected the sampling time and the control gain of PID controller through trial-and-error. The control program of the one board controller utilized lookup table to reduce calculation time, and bit shifting for the integer calculation in instead of floating point calculation. As the results, the controller carried out relatively high speed PID control on sampling time 0.25 ms. At last the rotation test for the magnetic bearing system was carried out by 3 phase induction motor and air turbine.