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AZ80압출재를 적용한 컨트롤 암 단조품의 기계적 특성 분석
이상익(S. I. Lee),윤종헌(J. H. Yoon),이정환(J. H. Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
Transportation machines filed to the required weight of aluminum alloys and steel alloys to replace studies are being made of magnesium alloy. Magnesium alloy has excellent specific strength, vibration damping and electromagnetic shielding capability, is increasingly being used in automobile body parts in order to reduce carbonn emissions and increase energy efficiency through reduction of weight. However, magnesium has a low formability at room temperature owing to its strong plastic anisotropy of tension and compression. The application of magnesium alloy can reduce the weight of a control arm, which is a complex-shaped suspension system part in a vehicle. In this paper, the control arm, was warm forged using extruded AZ80. Warm forging was carried out at 250 to 350˚C. Control arm was evaluated microstructure and mechanical properties.
이상익(S.I Lee),유재근(J.G Yoo),전정채(J.C Jeon),전현재(H.J Jeon),허혜성(H.S Heo),최규하(G.H Choe) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
This paper presented a actual conditions on a false-tripping of ELB(Earth Leakage Breakers) and an assessment of the harmonics due to non-linear electronic equipment such as personal computers, rectifier, electric furnace and test equipments in plant installations. Actual conditions on a failure of ELB were surveyed and analyzed by making up a question to safety managers of plant installations. Also, power quality measurements such as harmonic currents, voltage and current waveform and current imbalance were made at various plant installations where nuisance tripping of ELB is often occurred. The results of this study can be used in making decisions regarding cause of ELB trip and operating and tripping characteristics test of ELB when subjected to distorted current waveform.
이상익(S.I Lee),유재근(J.G Yoo),전정채(J.C Jeon),전현재(H.J Jeon),허혜성(H.S Heo),최규하(G.H Choe) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
Recently the harmonic generation has deteriorated the quality of electricity and affected the performance on the electrical installation including personal computer, fax, community devices and so on. Some studies of harmonic affects in diagnosis and the cause of accident has not done by the experimental data of harmonic source but merely by presumption according to qualitative analysis. So, in order to research the harmonic affect on the electrical installation according to quantitative analysis and gather reliable data over and over again, it is necessary to develop an Harmonic power source which is capable of generating some harmonics. In this paper, we described about realization of Harmonic power source control module which can produce and added harmonics for the analysis due to harmonic effects.
이상익(S.I Lee),전현재(H.J Jeon),김기현(G.H. Kim),배석명(S.M. Bae) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
전기설비에서 전기안전을 확보하기 위해 전기설비의 전압, 전류, 절연저항, 누설전류 등을 직접 측정하고 관리하려면 시간과 비용이 많이 소요된다. 최근 전력 IT기술들의 발전과 활용이 증가하고 있는데 이러한 기술들을 전기설비 전기안전 관리에 적용할 경우 운영 및 유지보수의 효율성과 전기안전을 확보할 수 있다. 따라서 전기설비의 효율적인 관리와 전기안전을 확보하기 위한 전력 IT 기반 전기안전감시시스템을 설계하여 활용하고자 한다.