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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 2, Issue 3 - Dec 1998
Volume 2, Issue 2 - Sep 1998
Volume 2, Issue 1 - Jun 1998
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Principle and Application of Particle Image Velocimetry(I)
Cho, D.H. ; Lee, Y.H. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 5~12
A study on the Structure of Turbulent Diffusion Flame Behind the Hollowed Flame Holder
Kang, I.G. ; Lee, W.S. ; Kim, T.H. ; Lee, D.H. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 13~19
The purpose of study is to investigate the flame stability and Structure of turbulent diffusion flame behind the hollowed flame holder, which is located on the waste gas coming out from the test furnace. Fluctuating temperature and ion current measurement and their statistical treatment were used for the purpose. Three types of flame were stabilized and each of which were changed by adequate equivalence ration. And we found that have no periodicity near reacting zone.
A Study on the Modelling of Combustion in a Small DI Diesel Engine
Koh, D.K. ; Kim, K.H. ; Jang, S.H. ; Ahn, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 20~26
Heat release data were obtained by analysis of cylinder diagrams from a test engine, naturally-aspirated small-size four-stroke DI diesel engine. These data were used to decide empirical coefficients of Whitehouse-Way's model, single zone combustion model. Finally, the comparison of calculated with experimental results was performed, and the accuracy of calculated versus experimental data of the model in predicting engine heat release and cylinder pressure was demonstrated.
The Effect of Combustion Chamber Shape on the Performance of Swirl Chamber in Diesel Engine (I)
Ra, J.H. ; Ahn, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 27~34
The purpose of this study is to investigate the performance of swirl combustion chamber diesel engine by changing the jet passage area and its angle, the depth and shape of the piston top cavity(main chamber). The performance of diesel engine with newly changed swirl combustion chamber was tested through the experimental conditions as engine speed, load and injection timing etc. The test results were compared and analyzed. The rate of fuel consumption was affected significantly by the jet passage area at the high speed and load, by the depth of the piston top cavity at the low speed and load. The exhaust smoke density and exhaust gas temperature depended sensitively on variation of the injection timing rather than the shape of the combustion chamber within the experimental conditions.
Fundamental Study on Ni-Base Self-Fluxing Alloy Coating(II) - The Effect of Strengthening Treatment on Mechanical Properties of Coating Layer -
Kim, Y.S. ; Oh, M.S. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 35~40
In this study, the author investigated the effects of strengthening treatments on the mechanical properties of plasma sprayed Ni-base self fluxing alloy. Strengthening treatments for sprayed specimens were carried out in 4 different temperature conditions in vacuum furnace. The mechanical properties, such as microhardness, thermal shock resistance and erosion resistance were tested for the sprayed specimens after strengthening treatments. And it was proved that the mechanical properties of coating layer were much improved by strengthening treatments.
A Vibration Control of Multi-layer Structure by LQ Type
Yang, J.H. ; Jeong, H.J. ; Kim, C.H. ; Byun, J.H. ; Sim, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 41~46
This paper presents the vibration control for the two degree-of-freedom which is a reduced model of multi-layer structure. This reduced model is designed for the first and second order resonance in the low frequency domain where the disturbance such as the earth quake has the large energy. And a designed controller using the LQ type
control theory shows the good performance for the impulse disturbance through the experimental results and the simulation results respectively.
Fuzzy Control of Underwater Robotic Vehicles
Lee, W. ; Kang, G. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 47~54
Underwater robotic vehicles(URVs) have been an important tool for various underwater tasks such as pipe-lining, data collection, hydrography mapping, construction, maintenance and repairing of undersea equipment, etc because they have greater speed, endurance, depth capability, and safety than human divers. As the use of such vehicles increases, the vehicle control system is one of the most critical subsystems to increase autonomy of the vehicle. The vehicle dynamics are nonlinear and their hydrodynamic coefficients are often difficult to estimate accurately. It is desirable to have an intelligent vehicle control system because the fixed-parameter linear controller such as PID may not be able to handle these changes promptly and result in poor performance. In this paper we described and analyzed a new type of fuzzy model-based controller which is designed for underwater robotic vehicles and based on Takagi-Sugeno-Kang(TSK) fuzzy model. The proposed fuzzy controller: 1) is a nonlinear controller, but a linear state feedback controller in the consequent of each local fuzzy control rule; 2) can guarantee the stability of the closed-loop fuzzy system; 3) is relatively easy to implement. Its good performance as well as its robustness to parameter changes will be shown and compared with those of the PID controller by simulation.
Servo Motor Control by On-Off Type Nonlinear Controller
Kim, Y.B. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 55~59
In practice, the property of nonlinearity is contained in all physical systems. In other word, all physical systems are nonlinear to some degree. Therefore it is important that we acquires a facility for analyzing feedback control systems with varying degrees of nonlinearity. To operate the system linearly over wide range of variation of signal amplitude and frequency, the system requires components of an extremely high quality. Such a system would probably be impractical in the view points of cost, space and weight. In this context of view, it is worth noting that the nonlinearities may be intentionally introduced into a system in order to compensate for the effects of other undesirable nonlinearities or to obtain better performance than what could be achieved using linear element only. A simple example of an intentional nonlinearity is the use of a nonlinear damped system to optimize response in accordance with the magnitude of error. In this paper, an on-off type nonlinear controller is introduced and the applicability and validity of a simple on-off controller are presented by the experimental result.
High Performance Position Control of a Pneumatic System
Jang, J.S. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 60~66
Positioning performance with a normal pneumatic positioning system, is mainly affected by friction force on the actuator and nonlinear characteristics of the control valve. We proposed a positioning system which is composed of a pneumatic actuator and high speed control valve. for accurate and speedy positioning. Driving piston on the actuator is mounted with externally pressurized air bearings to clear the friction force. This paper studies a method in order that improves positioning ability of the pneumatic positioning system considering the nonlinear characteristics of the control valve and the actuator.
High Speed Positioning of a Pneumatic Control System with a
Jang, J.S. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 67~72
To improve control performance, especially positioning speed, of a pneumatic positioning system, dynamic characteristics of a control valve should be considered. In case we design controller including dynamic characteristics of a control valve, it's not easy to design controller gain using simple state feedback because degree of a control system is increased. This study designed controller using loop shaping of
control theory for a model composed of a pneumatic actuator and a control valve, and positioning experiment using this controller was performed. As a result, it was verified that the controller is useful for high speed positioning of a pneumatic positioning system.
A Study on the Modeling and Diagnostics in Drilling Operation
Yoon, M.C. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 73~80
The identification of drilling joint dynamics which consists of drilling and structural dynamics and the on-line time series detection of malfunction process is substantial not only for the investigation of the static and dynamic characteristics but also for the analytic realization of diagnostic and control systems in drilling. Therefore, We have discussed on the comparative assessment of two recursive time series modeling algorithms that can represent the drilling operation and detect the abnormal geometric behaviors in precision roundshape machining such as turning, drilling and boring in precision diemaking. For this purpose, simulation and experimental work were performed to show the malfunctional behaviors for drilling operation. For this purpose, a new two recursive approach (Recursive Extended Instrument Variable Method : REIVM, Recursive Least Square Method : RLSM) may be adopted for the on-line system identification and monitoring of a malfunction behavior of drilling process, such as chipping, wear, chatter and hole lobe waviness.
Dynamic Response Characteristics of Tension Leg Platforms in Waves
Lee, C.H. ; Son, Y.K. ;
Journal of the Korea Society For Power System Engineering, volume 2, issue 2, 1998, Pages 81~86
The dynamic response characteristics of Tension Leg Platforms(TLPs) in waves are examined for presenting the basic data for design of TLPs. The numerical approach is based on a combination of the three dimensional source distribution method and the dynamic response analysis method, in which the superstructure of TLP is assumed to be flexible instead of rigid. Restoring forces by hydrostatic pressure on the submerged surface of a TLP have been accurately calculated by excluding the assumption of the slender body theory. The hydrodynamic interactions among TLP members, such as columns and pontoons, and the structural damping are included in the motion and structural analysis. Numerical results are compared with the experimental ones, which are obtained in the literature, concerning the motion and tension responses of a TLP in waves. The results of comparison confirmed the validity of the proposed approach.