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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 1, Issue 1 - Dec 1997
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A State of the Art of Exhaust Gas Aftertreatment System for Low Emission Vehicles
Choi, B.C. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 7~13
Trend of Industrial Gas Engine Technology
Yoo, K.T. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 14~21
Combustion Characteristics of Diesel Spray Impinging on a Glow Plug in RCEM
Kim, C.H. ; Kim, J.W. ; Park, K.H. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 22~34
Circumstances require improving diesel engine, and many studies have been done in constant volume chamber(CVC). Because the combustion mechanism of a diesel engine has many difficulties with non-homogeneous nature, there has been a limitation to analyzing the combustion mechanism with CVC. Studies are often given in a real engine, but also it has difficulties in modifying configuration of combustion chamber etc. To get more easy way for mote engine-like test, a rapid compression mechanism has been introduced. This study addresses to designing a rapid compression expansion machine(RCEM) driven by compressed air, and to applying it on IDI diesel combustion chamber which has a glow plug. RCEM is introduced first and its characteristics are tested, then spray/combustion characteristics of diesel spray impinging on a glow plug in RCEM combustion chamber are investigated. The results show active combustion in the system employing spray impinging on a glow plug so as to improve combustion efficiency.
The Effect of Mixing Chamber on the Characteristics of Annular Jet Pump
Kwon, O.B. ; Choi, H. ; Oh, B.H. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 35~41
Annular jet pump can be used for the transportation of solid materials and fish. The effect of mixing chamber on the characteristics of annular jet pump is sought in this paper. Experiments were done for several reducing angles of mixing chamber, and for several throat area. Water was used for both the primary fluid and secondary fluid. A vortex was observed for the straight mixing chamber, but it was not observed for the mixing chamber whose reducing angle is
or higher. The efficiency curves for the annular jet pump are presented in this paper, showing the annular jet pump which has 240 reducing angle and
value of At/As. is most effective among the tested several annular jet pumps.
Simulation on the Characteristics of PLN Diesel Injection System by Cam Profile
Lee, J.H. ; Wang, W.K. ; Ahn, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 42~51
In this study, in order to investigate the influence of cam profile on the injection rate, the characteristics of injection in PLN (pump - line - nozzle) diesel injection system were simulated. Six types of the profile of fuel cam were used for simulation. The maximum injection pressure and maximum injection rate of initial and end phase were analyzed to demonstrate the characteristics of injection. The mathematical model of the injection system and the computation results were verified by experimental results. Simulation results showed that the maximum injection pressure, maximum injection rate, injection quantity and pressure drop in the end phase were proportional to the velocity of fuel cam during the effective stroke.
Investigation of Heating Performance of Kerosene Fan Heater
Kim, Jang-Kweon ; Jeong, Kyu-Jo ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 51~60
In this paper, we investigated the heating performance and the basic characteristics required for normal combustion of kerosene fan heater. And also the iso-velocity contours and the iso-temperature contours of hot gas discharged from the exit of kerosene fan heater were analyzed. The experiment was carried out with kerosene fan heater attached to the blow-down-type subsonic wind tunnel with a test section of
. The purpose of this paper was to obtain the basic data for new design from conventional kerosene fan heater. Consequently it was found that (i) the pressure ratio
had a comparatively constant value of 0.844 according to the increase of the revolution of turbo fan, (ii) the primary excess air ratio had a range of
during normal combustion, and (iii) the heating performance of kerosene fan heater had a range of
Effect of Roughness Position on the Characteristics of Turbulence in Concentric Annuli
Ahn, S.W. ; Lee, W.J. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 61~69
Fundamental Study on Ni-Base Self-Fluxing Alloy Coating by Thermal Spraying(I) - Effect of Splat Behavior of Sprayed Particles on Mechanical Properties of Coating Layer -
Kim, Y.S. ; Kim, H.S. ; Nam, K.W. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 70~79
Ni-base self-fluxing alloy powder particles were flame sprayed onto the SS400 mild steel substrate surface. The effects of both substrate temperature and spraying distance on the splat behavior of sprayed particles were examined. The results obtained are summarized as follows: 1) In the splat behavior of Ni-base self-fulxing alloy particles sprayed onto the SS400 mild steel substrate, splashing was observed under the room temperature condition. On the contrary, it showed circular plate pattern in the substrate temperature range over 373K. 2) It was cleared that there was close relationship between mechanical properties of coating layer and splat behavior of sprayed particles. 3) From the experimental results, optimum spraying conditions showed excellent mechanical properties in the case of Ni-base self fluxing alloy sprayed onto the SS400 mild substrate were 473K of substrate temperature and 250mm of spraying distance.
Validity Examination on Evaluation of J-R Curve in the Nuclear Reactor Pressure Vessel Steels and Aluminum Alloys by Load Ratio Analysis
Yoon, H.K. ; Woo, D.H. ; Kim, Y.K. ; Cha, G.J. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 80~90
The purpose of this study is to evaluate the validity examination of the J-R curve characteristics for the nuclear reactor pressure vessel steels and Al alloys by the load ratio analysis. The results of the load ratio analysis are compared with those of the J-R curve which are obtained by the ASTM unloading compliance method. The crack length calculated by the load ratio analysis is agree well with the measured final crack length. The slope of the exponential J-R curve estimated by the load ratio analysis is slightly smaller than that by the ASTM unloading compliance method. The J-R curve obtained by the ASTM unloading compliance method is over-predicted and should be offsetted due to the initial negative crack. On the other hand, the load ratio analysis method can evaluate the J-R curve by only load-displacement curve without particular crack measurement equipment.
Torsional Vibration Analysis of Shaft System Using Transfer Dynamic Stiffness Coefficient
Moon, D.H. ; Choi, M.S. ; Sim, J.M. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 91~97
Recently, it is increased by degrees to construct complex and large structures. In general, in order to solve the dynamic problem of these structures they have used finite element method(FEM). In this method, however, it is necessary to prove whether its results are correct or not. Therefore it requires much effort, time and many expenses for dynamic analysis of complex and large structures. Authors have developed the transfer dynamic stiffness coefficient method(TDSCM) which is the new vibration analysis method for complex and large structures on personal computer, and confirmed that the results of this method are good for these structures on personal computer. In this paper, TDSCM is applied to the torsional vibration analysis for the shaft system which consist of concentrated disks and shafts of continuous body. First, we formulate algorithms for torsional free and forced vibration analysis, and compare the results of TDSCM and FEM.
A Performance Analysis and Experiment of Viscous Torsional Vibration Damper for High Speed Engine Shaft System
Yang, B.S. ; Jeong, T.Y. ; Kim, K.D. ; Kim, D.J. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 98~105
In general, crankshafts which are used in internal combustion reciprocating engines are subjects to high torsional vibration. Therefore, a damper is often used to minimize the torsional vibration in reciprocating engines. In this paper, in order to investigate damping performance of viscous damper, the real effective viscosity and complex damping coefficient of silicone oil, and the effective inertia moment of inertia ring are calculated considering the relative motion between damper casing and inertia ring. Based on these results multi-cylinder shaft is modeled into equivalent 2-degree of freedom system and optimum condition is estimated by calculating the amplification factor of viscous damper. Also the test damper was manufactured according to the result of theoretical investigation, the performance and durability was ascertained through experimental examination.
Dynamic Stability Analysis of A Vehicle in Limit Driving for Crash Avoidance
Kim, S.P. ; Baek, W.K. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 106~123
In this study, vehicle directional stability is investigated for limit driving for crash avoidance maneuver using a full vehicle dynamic model. The model was analytically validated using typical step steering and lane change simulation. Limit driving condition for the vehicle model was quoted from research results of references. It was demonstrated that instable vehicle motion was caused by not only road conditions but also driving conditions. Also, the simulation showed that braking combined with steering caused very hazardous situation in crash avoidance maneuver. Finally, phase plane plot approach was used to evaluate the dynamic instability.
Dynamics Modeling of Plate Treated with Active Constrained Layer Damping
Park, C.H. ; Kim, W.C. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 124~143
A Study on the Gap Estimation Circuit Design of the Magnetic Levitation System
Kim, C.H. ; Ha, Y.W. ; Sim, S.H. ; Yang, J.H. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 144~153
The magnetic levitation system is utilized in the magnetic bearing of high-speed rotor because of little friction, no lubrication, no noise and so on. The magnetic levitation system need the feedback controller for the stabilization of system, and gap sensors are generally used to measure the gap. The use of gap sensors brings out the increase of the number of troublesome, and the decrease of the control performance because of the dislocation between the measurement point and the control point. This paper presents the design of the gap estimation circuit for the sensorless method proposed by authors in the magnetic levitation system. We made the gap estimation circuit which was composed of both the superposition circuit and the measuring circuit. And we investigated the validity of the usefulness of the proposed sensorless method in the magnetic levitation system through results of actual experiment.
Flower Design of Roll Forming Process Using AutoLISP
Kim, K.H. ; Jung, D.W. ;
Journal of the Korea Society For Power System Engineering, volume 1, issue 1, 1997, Pages 154~161
Because of the complexity of the flower design of roll forming process, in which the flat strip is progressively deformed by successive sets of profiled rolls, a computer-aided design system for the flower design has been developed. It is programmed in AutoLISP and DCL(Dialogue Control Language) of AutoCAD. It has been found that the system is helpful in saving the time and effort required to design the flower of the product to be roll-formed.