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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 7, Issue 4 - Nov 2003
Volume 7, Issue 3 - Aug 2003
Volume 7, Issue 2 - May 2003
Volume 7, Issue 1 - Feb 2003
Selecting the target year
Introduction of Off-Shore Wind Turbine Systems
Jung, M.H. ; Goh, G.S. ; Yoo, K.T. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 5~10
A Prediction of Gas Flow in a Pipe and Orifice System Using The Finite Difference Method and The Method of Characteristics
Na, H.S. ; Koh, D.K. ; Cho, K.H. ; Jang, S.H. ; Ahn, S.K. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 11~16
Because of the advancement of digital computers and software technologies, simulation methods have been used to reduce time and costs. A lot of simulation methods have been developed for the improvement of charging efficiency on the intake and exhaust system of engines. In this study, as a basic step for the development of the gas flow simulation program for the intake and exhaust system, the gas flow in a pipe-orifice system was calculated with three algorithms(Method of Characteristics, MacCormack Method for conservation, and MacCoramck Method for nonconservation). The calculated results using three numerical algorithms were compared with measured result to verify the calculation accuracy.
Optimal Design of Blowing Plates to Minimize the Freezing Phenomena in the Freezer of a Side-by-side Refrigerator
Kwak, S.M. ; Lee, Y.H. ; Kum, J.S. ; Kim, N.S. ; Kim, S.B. ; Lee, Y.W. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 17~22
As side-by-side refrigerators came into existence, there has been a growing concern about the free%ins-up of the vital equipment in a walk-in freezer. Due to a bad performance, customers are experiencing too much frustration. In order to minimize the freezing phenomena, the numerical simulation has been performed on the characteristics of cold air flow in a side-by-side refrigerator. The flow field has been simulated with a standard
turbulent model and a SIMPLE algorithm based on the finite volume method. Through the results of the analysis of the pattern of cold air flow, finally the shape of outlet for cold air flow was modified. The present model was compared with the modified model. The latter was better than the former in minimizing the freezing phenomena.
Development of Computer Program of Torsional Vibration Analysis for Design of Diesel Engine Propulsion Shafting
Choi, M.S. ; Moon, D.H. ; Sim, J.M. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 23~28
It is very important to analyze the torsional vibration for the propulsion shafting of ship. The authors have developed the transfer stiffness coefficient method(TSCM) as a vibration analysis algorithm. The concept of the TSCM is based on the successive transfer of stiffness coefficient. The effectiveness of the TSCM was verified through many applications. In this paper, the TSCM is applied to the torsional free vibration analysis for the propulsion shafting of an actual shin with a diesel engine. In order to calculate the additional torsional stresses of the propulsion shafting the torsional forced vibration for the shafting is analyzed by using both the modal analysis method and the results of the torsional free vibration analysis by the TSCM. The accuracy of the present method is confirmed by comparing with the vibration analysis results of engine maker.
Condition Classification for Small Reciprocating Compressors Using Wavelet Transform and Artificial Neural Network
Lim, D.S. ; Yang, B.S. ; An, B.H. ; Tan, A. ; Kim, D.J. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 29~35
The monitoring and diagnostics of the rotating machinery have been received considerable attention for many years. The objectives are to classify the machinery condition and to find out the cause of abnormal condition. This paper describes a classification method of diagnosing the small reciprocating compressor for refrigerators using the artificial neural network and the wavelet transform. In order to extract salient features, the wavelet transform are used from primary noise signals. Since the wavelet transform decomposes raw time-waveform signals into two respective parts in the time space and frequency domain, more and better features can be obtained easier than time-waveform analysis. In the training phase for classification, self-organizing feature map(SOFM) and learning vector quantization(LVQ) are applied, and the accuracies of them ate compared with each other. This paper is focused on the development of an advanced signal classifier to automatize the vibration signal pattern recognition. This method is verified by small reciprocating compressors, for refrigerator and normal and abnormal conditions are classified with high flexibility and reliability.
Development of an Accelerometer for Measuring Low Frequency Vibration in Bridge
Park, K.J. ; Choi, N.S. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 36~43
In this paper, the strain-gauge type accelerometer is developed. This type of accelerometer has simple structure and cost for manufacturing is cheap, compared with other types of accelerometer such as piezoelectric, capacitance and servo, etc. Also it is very sensitive to the low frequency vibration which is the prominent characteristics of the vibration occurring by vehicles moving across a bridge. Two prototype accelerometers are designed and manufactured based upon the FE(Finite Element) method and static and dynamic calibration tests are performed to check out the linearity, sensitivity and cross sensitivity, etc. Experimental results designate that the proposed accelerometer show reasonable performances compared to the commercial one.
Nonlinear Finite Element Analysis for the Swaging of a High-Pressure Hose
Kim, B.T. ; Kim, H.J. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 44~50
The power steering hose is a kind of high-pressure hose with reinforced braids in rubber material. It is usually manufactured through the swaging process. In this paper, the deformation characteristics of a power steering hose during the swaging process were analyzed using the nonlinear finite element method. The material properties were obtained on experiments, and the contact conditions were used in consideration of real manufacturing process. Investigations were focused on the stress and strain values of the hose and meta] components at the maximum jaw stroke and at the completion of the process. Especially, the results of inner rubber component were interpreted in detail, because of its important role in the hose efficiency.
Spring Back on the Compound Bending of the Plastic Fuel Tube for Automobile
Moon, C.Y. ; Park, J.S. ; Jeong, Y.D. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 51~55
Recently the requirements for light weight and high performance of the automobile have increased. Especially, the plastic fuel tube makers have made their efforts to dove]op the various plastic fuel tube module with not only dimensional accuracy but also cost competitiveness. The experiment is performed to investigate spring backs for PA12 plastic fuel tubes in case of compound bending. In the experiment, steam bending process is adopted as bending method. In this study, the results we obtained are used to design the bending fixtures and the compound bending system.
A Study on the Post Deformation According to an Environmental Temperature of the Plastic Fuel Tube for Automobile
Park, J.S. ; Moon, C.Y. ; Jeong, Y.D. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 56~60
Recently the plastic fuel tube is usually used to reduce production cost and weight in automobiles. These days, material used to plastic fuel tube is the polyamide12. The fuel tube is made of the PA12. Post deformation of the tube has been changed by environmental temperature. So, it is important to prevent post deformation. The experiment is performed to investigate post deformation of the tube produced by each bending process. In this study, the results we obtained are used to bending process system for post deformation as the environmental temperature of the tube. It turned out that the method of steam heating and air cooling was shown less deformation than other methods.
Experimental Study on the Parameters Affecting Deep Drawing Process
Jung, D.W. ; Yang, H.I. ; Lee, S.H. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 61~65
Sheet metal forming process is a non-linearity problem which Is affected by various process variables, such as geometric shape of punch and die, frictional characteristic, etc.. Therefore, the knowledge of the influence of the process variables is needed in the design of sheet metal working processes. In this paper, deep drawing tests for blank holding force, punch speed and lubrication between sheet material and tool were carried out to investigate the influence upon sheet formability. Experimental results were discussed about the defects on the deformation behaviors during the forming process.
A Study on Effect of Shot Peening on Fracture Toughness of Spring Steel
Ha, K.J. ; Park, K.D. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 66~72
Recently, the steel parts used at the aerospace and automobile industries are required to be used light weight parts. Therefore, used material, steel have to be a high stress, which is an indispensable condition in this field. At the consideration of parts design, high hardness of the lightweight parts have an benefit of saving fuel and material. A high stress of metal has a point of difference according to the shape of design, external cyclic load and condition of vibration. A crack generates on the surface of metal or under yield stress by defect of inner metal defect or surface defect and slowly, this crack grow stable growth. Finally, rapidity failure phenomena is happen. Fatigue failure_phenomena, which happen in metal, bring on danger in human life and property therefor, anti-fatigue failure technology take an important part of current industries Currently, the shot peening is used for removing the defect from the surface of steel and improving the fatigue strength on surface. Therefore, this paper investigated the effect on frcature toughness using shot peening which is improve the resistance of crack growth and crack expansion rate by fatigue that make a compressive residual stress on surface.
The Consideration of the Damage in Gas Turbine Hot Parts for Repair Bonding Process
Kim, S.W. ; Choi, C. ; Kim, J.C. ; Lee, C.H. ;
Journal of the Korea Society For Power System Engineering, volume 7, issue 2, 2003, Pages 73~79
The present study was aimed at analysing the damage of a used gas turbine bucket after 39,500h of total service. Microstructures and cracks of service-induced bucket were observed. The crack might have initiated from the coating in the bucket surface by thermal fatigue and propagated into the GTD111 base metal. Maximum depth of penetration was 2.7 mm(full penetration) at the leading edge. Crack contains a lot of Cr-,Ti-,Al-oxide which will prohibit filling and wetting of insert metal. Depth and propagation direction of crack were accorded with centrifugal force and temperature distribution in turbine bucket. Present result will provide basic data for repair bonding process.