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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 3, Issue 4 - Nov 1999
Volume 3, Issue 3 - Aug 1999
Volume 3, Issue 2 - May 1999
Volume 3, Issue 1 - Feb 1999
Selecting the target year
Trend of Compressor Technology for Air Conditioners
Lee, U.S. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 5~12
Measurement of Flow Field in a Domestic Boiler Circulation Pump by PIV
Im, Y.C. ; Kim, J.H. ; Choi, M.S. ; Lee, Y.H. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 13~19
The purpose of the present experimental study is to apply multi-point simultaneous measurement by PIV(Particle Image Velocimetry) to high-speed flow region within a domestic boiler circulation pump. Two different kinds of flow rate(
)are selected as experimental condition. A volute casing and Impeller made of transparent Polycarbonate were made for the easy access of the illumination laser via fiber optical line and cylinder lens assembly to the measuring region. A CCD camera is syncronized with AOM to acquire clear original particle images. Optimized cross correlation identification to obtain velocity vectors is implemented by direct calculation of correlation coefficients. The instantaneous and time-mean velocity distribution, velocity profile and kinetic energy are represented quantitatively at the full-scale region for the deeper understanding of the unsteady flow characteristics in a commercial circulation pump.
Characteristics of Formaldehyde Emission from Small Gasoline Engine and Its Reduction Technology
Choi, B.C. ; Lee, N.S. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 20~25
Experiments were carried out to investigate the characteristics of formaldehyde emission from the small gasoline engine and its reduction technologies. Catalytic converters used are Pt/Rh, Pd/Rh, Pd/Pt,
monolith type. The measurement of formaldehyde was conducted by using the method of DNPH-GC. From the experimental results, formaldehyde emission increased in a lean mixture due to incomplete combustion of the hydrocarbons. The order of catalytic activity of formaldehyde oxidation was Pt/Rh > Pd/Rh > Pd/Pt. As the distance from the exhaust manifold to the inlet of the catalyst became far, in spite of lower catalyst temperature, formaldehyde concentration decreased because of the adsorption of formaldehyde.
A Study on Measurement and Reduction of Cavity Resonance Based on the Internal Acoustic Modeling of Compressor
Ahn, B.H. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 26~33
Pressure pulsation Inside the discharge and suction cavity of rotary and scroll compressor are often a major source of objectionable noise and vibration. The key factor of these noise and vibration is due to the cavity resonance. It is not only necessary to understanding the characteristics of pulsation in order to reduce the excitation force of gas to the cavity but also to verifying the phenomena of cavity resonance. For the purpose of these understandings, measurement and simulation of cavity resonance can lead to a better understandings how they occur and be very important to identify the ways to reduce the noise efficiently. In this paper, modeling of the cavity(internal acoustics inside the shell) is discussed and simulated using FEM. Results from the simulation are compared with those measurement in experiments. In describing of cavity mode by experiments, it is very important to specify the exact conditions under which they are measured. Finally, this paper shows the one example of reduced cavity resonance in the compressor.
Model Identification of Refuse Incineration Plants
Hwang, I.C. ; Kim, J.W. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 34~41
This paper identifies a linear combustion model of Refuse Incineration Plant(RIP) which characterizes its combustion dynamics, where the proposed model has thirteen-inputs and one-output. The structure of the RIP model is given as an ARX model which obtained from the theoretical analysis. And then, some unknown model parameters are decided from experimental input-output data sets, using system identification algorithm based on Instrumental Variables(IV) method. In result, it is shown that the proposed model well approximates the input-output combustion characteristics riven by experimental data sets.
The Damage Evaluation and Acoustic Emission Characteristics of the Unidirectional Ply CFRP Composite Materials in a Drilling Procedure
Youn, Y.S. ; Kwon, O.H. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 42~50
In recent years, composite materials like CFRP are increasingly used in various fields of engineering because of their unique properties which offer a high strength/density and high modulus/density. When CFRP structures are manufactured in drilling processes which are frequently practiced in an Industry, they bring on the delaminations sometimes. So, acoustic emission(AE) techniques were used for a condition monitoring of the drilling process in CFRP. In this study, the AE from CFRP estimated the delamination which reduces the strength and load carrying capacity under the drilling process and the initial delamination were well caught and measured by a video camera. From the results, it was found the relationships between failure mechanism of CFRP delamination and AE characteristics as like amplitude and count.
Fatigue Crack Propagation Characteristics in SA 516-70 Steel for Pressure Vessels at Low Temperature
Park, K.D. ; Cha, S.S. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 51~56
Fatigue crack propagation rates and characteristics of the SA516-70 steel which is used for the low temperature pressure vessels, were studied in the room temperature of
and low temperature ranges of
with stress ratio of R=0.05. The obtained experimental results are as follows; 1) In the logarithmic relationship between the fatigue crack propagation rate(da/dN) and stress intensity factor K, the linear relationship was obtained up to da/dN >
mm/cycle in the same of room temperature, but in low temperature case, the relationship was extended to the range of low crack propagation rate. 2) The lower limit stress intensity factor of SA516-70
and in the case of low temperature
, the crack propagation rate da/dN which showed a linear relation, reached rapidly to the
. As the results, the crack propagation rates of
were lower than that of room temperature and according to the testing temperature the rates were decreased rapidly to the
. 3) On the relationship between the stress intensity factor
and the track propagation cycle, the stress intensity factors of low cycle region was rapidly increased at low temperature, but
was increased rapidly at room temperature of high cycle. 4) On the relationship between the fatigue crack propagation rate and cycle, the fatigue crack propagation rate showed higher gradient in the room temperature than the low temperature due to the increment in ductility at low temperature.
Composites by Pressureless Infiltration Technique
Kim, J.D. ; Kim, H.J. ; Koh, S.W. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 57~63
The fabrication of
composites by pressureless infiltration technique was made to investigate the effects of processing variables such as content of Mg, processing temperature and time on the infiltration behavior of molten Al and microstructure. When the pure Al was infiltrated into mixtures of Mg and
powder, processing temperature required to spontaneous infiltration was decreased and critical processing temperature and Mg content were
and 3wt% respectively. The content of Mg was found the most powerful variable for infiltration of molten Al. The infiltration ratio increased with Mg content and processing temperature, however the
composites which were fabricated by high Mg content and processing temperature resulted in non uniform dispersion of
particles by excessive interfacial reaction. XRD pattern indicated that
and AIN was observed at the interface of
particles and in the Al matrix as reaction products.
Development of Drive for BLDC Motor Using Resolver
Lee, G.Y. ; Lee, C.H. ; Kim, S.B. ; Kwon, S.J. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 64~69
The paper shows a result for development of BLDC motor drive by using a resolver as position detection sensor. The developed drive use a method detecting rotor position based on HSI interrupt function of microprocessor without a specialized counting circuit. The algorithm generating three-phase PWM wave to change switching voltage and current is realized based on single chip microprocessor. The PWM generating part and position counting circuit are realized by software technique without usage of conventional analogue circuit or object-oriented chips. So the drive system become compact. The effectiveness of the developed drive is verified by experimented results of speed response for step reference input.
A Speed Sensorless Control of Induction Motors Based on Feedforward Quick Torque Response Control Technique
Jeong, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 70~78
The vector controlled induction motor(I.M) with speed sensor has been widely used for variable speed drive systems. In these application fileds, speed sensorless control are expected strongly to progress reliability, simplicity and cost performance of I.M and to expand its application part. This paper describes a novel speed sensorless control method of I.M based on feedforward quick torque response control technique. Especially, this paper aimed at the realization of sensorless control in the very low speed region, The proposed method can be formulated simply from a motor circuit equation and conducted easily by detecting primary motor currents and a voltage command at every sampling time. Throughout some results of numerical simulations with the assumption of using a pulse width modulation(PWM) voltage source inverter, the validity of the method was successfully confirmed.
Laser Beam Projection by Use of a Galvano-Mirror and Its Application to Holographic Memories
Park, Y.S. ; Shin, D.H. ; Ok, J.S. ; Lee, J.H. ; Jang, J.S. ; Lee, W.C. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 79~83
We implemented a system that can change laser beam directions rapidly by controlling the galvano-mirror, on which a mirror is mounted, with a computer. We show that a laser projection can be realized by programming our system properly, and that it can also be used for multiplexing 2-dimensional image information in the data storage of holographic memories efficiently.
A Study on a Sufficient Condition for Decoupling Control System Design
Kim, Y.B. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 84~88
In this paper, systems described by state-space models are considered. For these systems, author studies the decoupling of linear systems and gives a sufficient condition for a system to be made feedback decouplable. Especially, the condition is given by LMI(Linear Matrix Inequality) form. Based on this condition, it is guaranteed that the system decoupling problem is achieved and the
constraint is satisfied simultaneously. This result can be easily extended to the robust decoupling control system design problems.
A Study on the Formability of Ellipse Panel by Finite Element Method
Kang, D.M. ;
Journal of the Korea Society For Power System Engineering, volume 3, issue 2, 1999, Pages 89~97
In this paper the forming simulations of ellipse bulge have been researched by using
to estimate the sheet metal forming and the plastic deformation characteristic of ellipse bulge. Thin elliptical diaphragms of brass, copper, aluminum, and mild steel are bulged in elliptical dies having aspect ratios of 1.33 and 2. In order to compare the simulation results with the experiment and ellipse bulge's theory derived by using Johnson and Duncan's theory, the relations of hydraulic pressure and polar height, polar thickness strain and polar height, were compared. According to this study, the results of simulation and ellipse bulge's theory derived by using Johnson and Duncan's theory, and the bursting pressure and the bursting polar height are good agreement to the experiment. So, the results of simulation by using
and the ellipse bulge's theory will give engineers good information to make assessment the formability and plastic deformation characteristic of hydraulic ellipse bulge test.