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정일석(I.S. Jeong),김상재(S.J. Kim),이용성(Y.S. Lee),송택호(T.H. Song),홍승열(S.Y. Hong) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
For developing fatigue design curve of cast stainless steels that would be used in piping material of domestic nuclear power plants, a low-cycle fatigue test rig was built. It is capable of performing tests in pressurized high temperature water environment of PWR. Cylindrical specimens of CF8M were used for the strain-controlled environmental fatigue tests. Fatigue life was measured in terms of the number of cycles with the variation of strain amplitude at 0.04%/s strain rates. The disparity between target length and measured length of specimens was corrected by using finite element method. The corrected test results showed similar fatigue life trend with another previous results.
[論文] 기계가공시 분당가공비를 고려한 최적 절삭 조건에 관한 연구
이길우(G. Y. Lee),이용성(Y. S. Lee) 한국자동차공학회 1992 오토저널 Vol.14 No.6
Recently the multi-kind, small-amount manufacturing system has been replacing the mass manufacturing system, and domestic machining inustry also is eager to absorb the new technology because of its high productivity and cost reduction. The optimization of the cutting condition has been a vital problem in the machining industry, which would help increase the productivity and raise the international competitiveness.<br/> It is inteded in this study to investigate the machining costs per unit time which is essential to the analysis of the optimal cutting condition, to compute the cutting speed that lead to the minimum machining costs and the maximum production to suggest the cutting speed range that enables efficient speed cutting, and to review the machining economy in relation to cutting depth and feed. Also considerded are the optimal cutting speed and prodution rated in rrelation with feed.<br/> It is found that the minimum-cost cutting speed increases and the efficient cutting speed range is reduced as machining cost per unit time increases since the cutting speed for maximum production remains almost constant The machining cost is also ,lowered and the production rate increases as the feed increases, and the feed should be selected to satisfy the required surface. roughness. The machining cost and production rate are hardly affected by the cutting depth if the cutting speed stays below 100m/min, however, they are subject to change at larger cutting depth and the highefficient speed range also is restricted.<br/> It can be established an adaptive optimal cutting conditions can be established in workshop by the auto-selection progam for optimal operation. It is expected that this method for choosing the optimal cutting conditions might contribute to the improvement of the productivity and reduced the cost<br/> It is highly recommended to prepare the optimal cutting condition thus obtained for future use in the programing of G-function of CNC machines. If proper programs that automatically select the optimal cutting conditions should be developed, it would be helpful to the works being done in the machine shops and would result in noticeable production raise and cost reduction.
김관회(K.H. Kim),이용성(Y.S. Lee),유승을(S.E. Yoo),최영민(Y.M. Choi),정광철(G.C. Jung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
To improve startability of engine at low temperature, two characteristics of glow plug are needed. The first is fast heat-up charateristic that decreases the waiting time to start and the second is duralibity that stands in combustion chamber that is under the condition of high temperature, high pressure and corrosion. Metal glow plug have been used has some limit to enhance heat-up speed and duralibity at the same time, so we developed ceramic glow plug. It takes for ceramic glow plug 3 seconds on average to 800℃ . This property of ceramic glow plug is 2 times as fast as that of metal. The result of duralibity test, 1 minute on-off test under 11 voltage, shows that no sign of shortage can be observed<br/>
FSA를 적용한 초고압 지중송전 XLPE케이블의 부분방전 진단기술
신동훈(D-H Shin),이용성(Y-S Lee),양종석(J-S Yang),박노준(N-J Park),박대희(D-H Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
We studied the improved detecting method on Partial Discharge occurred in EHV power cable. In this field, we usually applied the several sensor for partial discharge. This is metal foil employed with the capacity foil-sensor. We detected the partial discharge through regularly array standard foil-sensor for the better improvement of existed foil-sensor in this research. This test is progressed in real EHV liveline, we analyzed that compare existed foil-sensor to detect character of FSA(Foil Sensor Array) for this test. From this result, detective character of fabricated FSA showed better result than existed foil-sensor.