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이정완(J. W. Lee),황선광(S. K. Hwang),백현무(H. M. Baek),임용택(Y. T. Im),손일헌(I. H. Son),배철민(C. M. Bae) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
In this study, an asymmetric drawing process is designed as a new process to manufacture high-strength wires. It is the same process with conventional wire-drawing except for geometry of drawing dies. To compare the asymmetric drawing and wire-drawing, three-dimensional finite element analyses were carried out. Effective strain of the asymmetric drawing was higher than the one of the wire-drawing. For verification of the designed process, experiments of the asymmetric drawing and wire-drawing with the same reduction of area per each pass were conducted with low carbon steel. Tension test results showed that UTS value of the drawn wires by the asymmetric drawing was higher than the one of the conventional wire-drawing. This result indicated that the asymmetric drawing process could manufacture high-strength wires compared to the conventional wire-drawing.
김석현(Kim, S. H.),유능수(Yoo, N. S.),남윤수(Nam, Y. S.),이정완(Lee, J. W.) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
A vibration monitoring system for a small size wind turbine (WIT) is established and operated. The monitoring system consists of monolithic integrated chip accelerometer for vibration monitoring, anemometers for wind data acquisition and auxiliary sensors for atmospheric data. Using the monitoring system, vibration response of a 6kW stand alone WIT generator is investigated. Acceleration data of the WIT tower under various operation condition is acquired in real time using LabVIEW and the data are remotely transferred from the test site to the laboratory in school by internet. Vibration response characteristics of the tower structure are diagnosed in the aspect of stability of W/T. Wind data and electrical power performance are also investigated with the stability problem.