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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
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Volume & Issues
Volume 15, Issue 6 - Dec 2011
Volume 15, Issue 5 - Oct 2011
Volume 15, Issue 4 - Aug 2011
Volume 15, Issue 3 - Jun 2011
Volume 15, Issue 2 - Apr 2011
Volume 15, Issue 1 - Feb 2011
Selecting the target year
A Study on Lubrication Characteristic of the Hydrostatic Bearing In Swash Plate Type Piston Motor
Lee, Yong-Bum ; Kim, Kwang-Min ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 5~9
DOI : 10.9726/kspse.2011.15.5.005
The hydraulic piston using a hydrostatic bearing has been used widely due to its satisfying performance at very high pressurized circumstance and relative higher power density in comparison to conventional one. For high pressurization, enhanced efficiency and long durability of the hydraulic piston, the design of hydrostatic bearing is at issue, which is installed between piston shoe and swash plate. The performance of the hydrostatic bearing is influenced significantly by the assembly of the piston shoe consisting of circular land and recess. In this study, to estimate the performance of the hydrostatic bearing, the characteristics for lubrication of the assembly of the piston shoe were investigated by measuring a leakage rate of hydraulic fluid under an experimental condition, where a rotating velocity of the piston, hydraulic pressure and temperature of the hydraulic fluid were changed systematically. In addition, a film thickness of the hydraulic fluid on the piston shoe was measured and compared to theoretical one.
Effects of the Fuel Injection Timing on the Combustion Characteristics in CRDI Diesel Engine
Kim, J.S. ; Kim, K.H. ; Lee, H.S. ; Lim, S.W. ; Kang, H.Y. ; Koh, D.K. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 10~15
DOI : 10.9726/kspse.2011.15.5.010
This paper describes the engine performance and combustion characteristics of a CRDI diesel engine, operated by electronically controlled diesel fuel injector with variable injection timing. This experiment focused on fuel injection timing and pressure about combustion characteristics of CRDI diesel engine. EGR was excepted because it would be furtherly analyzed with additional experiments. The experiment was conducted under the circumstance of engine torque for 4, 8, 12 and 16 kgf-m and fuel injection timing for
BTDC, at the engine speed of 1100, 1400, 1700 and 2000 rpm. Fuel injection was controlled to retard or advance initiation of the injection event by electronically controlled fuel injection unit injector on the personal computer. When fuel was injected into the cylinders of a CRDI diesel engine it would go through ignition delay before starting of combustion. Therefore, fuel injection timing of CRDI diesel engine had a significant effect upon performance and combustion characteristics. Depending on the injection timing the fuel consumption rate following the rotational speed and torque was 3~78 g/psh (1.7~30.6%). The range of fuel injection timing that resulted in low fuel consumption overall was BTDC 15-10 degrees.
Combined Propulsion System Analysis for Naval Combatant Vessels using Diesel and Gas Turbine Engine
Lee, H.M. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 16~21
DOI : 10.9726/kspse.2011.15.5.016
The large scale decisive battle will be gradually reduced on the sea in the future and surface combatant ship installed advanced weapon units as well as propulsion system will be continuously increased. The high level of military technology leads to appear state-of-the-art weapon system using high power energy. As a results, fossil fuel powered main prime mover as diesel engine and gas turbine which are composed of mechanical propulsion system should be decreased from combatant ship in the near future. The new building naval combatant ship with the latest technology has electric based propulsion method of the hybrid type combined with mechanical and electrical drive. U.S. and Royal Navy, especially, select the integrated fully electric based propulsion system for the next generation combat ship and play an important roll for developing them. In this context, this paper was focused on the deduction of implications through analyzing the combatant ship propulsion system using diesel and gas turbine engine which are promoted on the worldwide.
Study on Damage Mechanism Analysis and Recovery Characteristic of the Large Scale Steam Turbine Cased by Water Induction
Kim, D.Y. ; Park, G.H. ; Lee, B.H. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 22~29
DOI : 10.9726/kspse.2011.15.5.022
In this study, the damage mechanism of large scale steam turbine due to water induction was analyzed and recovery characteristics were reviewed. A turbine consists of the rotating rotor and the stationary casing, and the clearance between them is very small for the efficiency enhancement. If water induction, while relatively cold steam or water is introduced into turbine, occurs, the considerable humping is caused at the casing near the initial water induction point and that induces the rubbing between rotor and casing. Finally, it leads to the catastrophic failure. Bowed rotor has the different characteristics in the recovery depending on damage degree. The elastic deformation due to light rubbing is recovered by turning the rotor with 3 rpm under normal operation condition, but most plastic deformation due to rubbing deforms the local microstructure and that results in permanent deformation which could not be recovered under normal operation condition. Bowed rotor has diverse characteristics depending on the recovery method, and the method is empirical and needs the cutting edge technology. Careful recovery treatment of the rotor will eliminate the risks and secure the high quality rotor similar to new rotor. If any critical error is made during the recovery, the rotor would not be recovered permanently and it should be scrapped.
Microscopic and Macroscopic Mechanics of Musculotendon Actuation
You, S.S. ; Lim, T.W. ; Ji, S.W. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 30~36
DOI : 10.9726/kspse.2011.15.5.030
A study on flow characteristic of a stand type Kimchi refrigerator for optimum design of air flow passage
Han, H.R. ; Jung, H.Y. ; Park, Y.K. ; Choi, Y.H. ; Lee, Y.W. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 37~42
DOI : 10.9726/kspse.2011.15.5.037
The normal cooling system of a refrigerator is applied to indirect a cooling methods. But the Kimchi refrigerator is applied to direct the cooling method. Recently when the model was applied to both direct and indirect the cooling methods, the improvement was considerable. With the development of the living standards in Korea, there has been more sensitive dissatisfaction about the taste and the smell of Kimchi. In order to solve these kinds, there is a need to systematic and scientific approach. Based on these, the purpose of this study is to optimize design for improve the storage period of Kimchi refrigerator. In this research, we concentrate on the temperature change and heat transfer characteristics of interior parts of the Kimchi refrigerator due to control cycle of temperature and flow phenomenon of cooling air.
Experimental Study on Turbulence and Pressure Drop Characteristics in a Rectangular Duct Fitted with Semicircular Ribs
Nine, Md.J. ; Lee, G.H. ; Woo, J.S. ; Chung, H.S. ; Jeong, H.M. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 43~48
DOI : 10.9726/kspse.2011.15.5.043
The article represents an experimental investigation on friction and turbulent flow characteristics of free airflow through a rectangular duct fitted with semicircular ribs of uniform height (e
A study on wireless power generation for marine information acquisition using EAP actuator
Jeong, Eun-A ; Lee, Kee-Yoon ; Jeong, Hwang-Hun ; Yun, So-Nam ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 49~53
DOI : 10.9726/kspse.2011.15.5.049
This study concerns about wireless power generation that uses the energy harvester with EAP actuator. The UWSN(Underwater Wireless Sensor Network) has been considered many times by many researches. Because the information of underwater is getting important to secure the resource or to predict the meteorological phenomena. But the sensor node in the UWSN is driven by the acoustic wave to communicate with other sensor node. And this acoustic wave usually spends a 100 times energy than the RF(Radio Frequency) wave due to transfermation medium(sea water). Therefore the power source of the sensor node is very important that is needed to improve in the UWSN. For this purpose, the energy harvester is made by the acrylic elastomer in this study. And the electrode is modified with an aluminum impurity to improve the efficiency of energy harvester. After that, the modified energy harvester is experimented to confirm the improvement of the energy efficiency.
Mode analysis of end-milling process by RLSM
Kim, J.D. ; Yoon, M.C. ; Kim, K.H. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 54~60
DOI : 10.9726/kspse.2011.15.5.054
In this study, an analytical realization of end-milling system was introduced using recursive parametric modeling analysis. Also, the numerical mode analysis of end-milling system with different conditions was performed systematically. In this regard, a recursive least square(RLS) modeling algorithm and the natural mode for real part and imaginary one was discussed. This recursive approach (RLSM) can be adopted for the on-line system identification and monitoring of an end-milling for this purpose. After experimental practice of the end-milling, the end-milling force was obtained and it was used for the calculation of FRF(Frequency response function) and mode analysis. Also the FRF was analysed for the prediction of a end-milling system using recursive algorithm.
Structural Analysis for Silk Hat type of the Harmonic Drive for Precision Robot
Nam, W.K. ; Ham, S.H. ; Oh, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 61~66
DOI : 10.9726/kspse.2011.15.5.061
Recently, the speed reducer which is applied to robot has conducted a steady development on developments in the field of robotics. Among them, Harmonic drive is a high-stiffness, precision-controlled speed reducer and has high precision, compact, light in weight and high-reduction-ratio characteristics. The feature of flexspline of Harmonic Drive are two types. One is Cup type, the other is Silk Hat type. Silk Hat type is used in case of lighter and more compact in spatial because Silk Hat Type is hollow. According to the shape of silk hat, diaphragm is fractured because stress is concentrated. In this paper, the various shapes of silk hat are suggested to improve the durability of silk hat. And in the case of each shape, a study on stress and deformation using the FEM tool was carried out on flexspline.
A Numerical Study of Car Seat Recliner
Lee, K.Y. ; Do, J.Y. ; Nam, K.W. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 67~71
DOI : 10.9726/kspse.2011.15.5.067
Fine blanking is a specialized form of blanking where there is no fracture zone when shearing. This is achieved by compressing the whole part and then an upper and lower punch extract the blank. This allows the process to hold very tight tolerances, and perhaps eliminate secondary operations. In the present study, tensile test and numerical simulation has been performed to investigate distribution of deformation and stress of car seat recliner. The commercial ABAQUS/Explicit software was applied for analyzing the stress and strain of the recliner. In analysis, three lock gear has reached the maximum moment on rotational degree of 2.27. This is more than two times than maximum moment of same size recliner, and can be used safely. Therefore, these can use as criterion of actual structural design.
Optimal Parameter Design for Al/SiC Composites using Design of Experiments
Lee, K.J. ; Kim, K.T. ; Kim, Y.S. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 72~76
DOI : 10.9726/kspse.2011.15.5.072
In this work, the parameter optimization for thermal-sprayed Al/SiC composites have been designed by
orthogonal array and analysis of variance(ANOVA). Al/SiC composites were fabricated by flame spray process on steel substrate. The hardness of composites were measured using micro-vickers hardness tester, and these results were analyzed by ANOVA. The ANOVA results showed that the oxygen gas flow, powder feed rate and spray distance affect on the hardness of the Al/SiC composites. From the ANOVA results, the optimal combination of the flame spray parameters could be extracted. It was considered that experimental design using orthogonal array and ANOVA was efficient to determine optimal parameter of thermal-sprayed Al/SiC composites.
Wear Behavior of Al-based Composites according to Reinforcements Volume Fraction
Lee, K.J. ; Kim, K.T. ; Kim, Y.S. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 77~82
DOI : 10.9726/kspse.2011.15.5.077
SiC particulate reinforced Al matrix composites with different SiC volume fractions were fabricated by thermal spray process. And the dry sliding wear test were performed on these composites using the applied load of 10 N, rotational speed of 30 rpm, radius of rotation 15 mm. Wear tracks on the Al/SiC composites were investigated using scanning electron microscope(SEM) and energy dispersive spectroscopy (EDS). It was observed that wear behavior of Al/SiC composites and formation of MML was changed dramatically according to reinforcement volume fraction.
Performance analysis of shape recognition in Senzimir mill control systems
Lee, M.H. ; Shin, J.M. ; Han, S.I. ; Kim, J.S. ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 83~90
DOI : 10.9726/kspse.2011.15.5.083
In general, 20-high Sendzimir mills(ZRM) use small diameter work rolls to provide massive rolling force. Because of small diameter of work rolls, steel strip has a complex shape mixed with quarter, edge and center waves. Especially when the shape of the strip is controlled automatically, the actuator saturation occurs. These problems affect the productivity and quality of products. In this paper, the problems in automatic shape control of ZRM were analyzed. In order to evaluate the problems for the automatic shape control in ZRM, recognition performance was analyzed by comparing the measured shape and the recognized shape. The actuator positions by the shape recognition and the manual operation were compared. From the analysis results, the necessity of the improvement of recognition performance in ZRM is suggested.
A Study on the Development of Guide Line Measurement System in the Driving Condition
Kim, Young-Bok ;
Journal of the Korea Society For Power System Engineering, volume 15, issue 5, 2011, Pages 91~96
DOI : 10.9726/kspse.2011.15.5.091
The handling ability of containers at the terminal strongly depends on the performance of the cargo handling system such as RTGC(Rubber Tired Gantry Crane) and RMGC(Rail Mounted Gantry Crane). This paper introduces a guide line measurement system on the operating condition, in which two camera are installed to detect the guide line. Because the line tracking is the basic technique for control system design of RTGC, it is necessary to develop a useful and reliable measurement system. If the displacement and angle of the RTGC relative to a guide line as the trajectory to follow is obtained, the position of RTGC is automatically calculated. Therefore, in this paper, a camera-based measurement system is introduced. The proposed measurement system is robust against light fluctuation and cracks of the guide line. This system consists of two camera and a PC which are installed at the lower side of the RTGC. Two edges of the guide line are detected from an input image taken by the cameras in the moving state, and these positions are determined in a Hough parameter space by using the Hough transformation method. From the experimental results, the accuracy and usefulness of the proposed system is evaluated by comparing other instruments.