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이정우,정연두,한명근,Lee Jeong-Woo,Cheong Yeon-Doo,Han Myoung-Keun 한국공학교육학회 2005 공학교육연구 Vol.8 No.1
이 논문은 삼척대학교 메카트로닉스 공학부에서 자동제어, 디지털제어, 마이크로 프로세서응용의 실습을 위해 사용되는 자기 부상실습장치의 설계와 제작에 관한 것이다. 이 장치는 MIT 대학의 설계에서 영감을 받아 개발되었으나, MIT의 장치가 아날로그형임에 비해 디지털형으로 개발하였다. 이 실습장치는 아날로그와 디지털 방식으로 동시에 제어하고 모니터할 수 있다. 더구나 부품의 가격은 MIT의 것과 비슷하거나 더 싼 편이다. 그리고 이 장치는 자기 홀 센서나 적외선 센서를 이용하여 제어할 수 있어서 학생들에게는 센서의 사용과 신호처리를 위한 다양한 경험을 얻을 수 있도록 되어있다. 이 설계는 저자들이 제작하여 시험해 보았으며, 학생들에게 실험 프로젝트 형식으로 제공될 것이다. 이 장치는 의도적으로 덜 보상되어지고, 적당한 수준까지만 조립된 상태에서 학생들에게 제공될 것이며, 학생들은 센서신호와 제어기의 성능을 분석한 후 보상기를 설계하고 센서의 신호를 처리할 것이 기대된다. This paper describes the design and fabrication of magnetic levitation kits for use in the hands on experiments of automatic control, digital control and microprocessor applications in the division of mechatronics in Samcheok university. The kits are developed inspired by MIT's design, but it is designed on the digital basis, whereas MIT's is designed on the analog basis. As a result, the kits can be monitored and controlled on the analog and digital control techniques. Furthermore, the cost of kit components is comparable or lower to that of MIT design. And the kits can be controlled with magnetic hall sensors and/or infrared sensors, which provides more versatile experience on the use of sensors and signal filtering to the students. The design is fabricated and tested by authors and will be provided to the students as lab projects. The kits will be intentionally presented with a device that is poorly instrumented and poorly compensated. And the students are expected to analyze sensor signal and controller performance, and then, perform compensator design and signal filtering.
Wafer Slicing Machine의 Wire 장력 제어
이정우(LEE Jeong-Woo),정연두(Cheong Yeon-Doo),김두형(KIM Doo-Hyeong) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
We have studied the technique of wire tension control for use in wafer slicing machines, which is used to produce thin(thickness below 200μm) silicon wafer for solar cells. For this purpose, we analyse the wire cutting system, and some necessary dynamics of cutting system to control the tension of thin wire. As a result, we devised a novel wire tension control system and designed a experimental wire tension control system. The system is used to verify wire tension control algorithm. Through numerous experiments, wire tension control error within 10% is realized while maintaining wire feeding speed as 15-20m/sec. These experimental results verifies the effectiveness of the developed wire tension control system. This technique will contribute to cost down of thin silicon wafer for solar cells for next generation.
윤정의(Jeong-Eui Yun),심병민(Byong-Min Sin),한세범(Seh-Beom Han),정연두(Yeon-Doo Cheong),김동렬(Dong-Youl Kim),채경덕(Kyung-Duck Chae),황영택(Yeong-Taik Hwang),박종원(Jong-Won Park),윤성호(Seong-Ho Yoon),김용태(Yong-Tae Kim),박병완(P 한국트라이볼로지학회 2005 한국윤활학회지(윤활학회지) Vol.21 No.4
Engine lubrication system has very complex oil flow networks. Therefore it is difficult to evaluate and optimize the system only depending on experimental results. When we plan upgrading the engine performance the engine lubrication system must be considered in the plan. In this paper, engine lubrication system design using computational fluid dynamic analysis was studied. To do this, unsteady transient flow network analysis on the engine oil circuit system was carried out. Finally we discussed the design process in the modified engine lubrication system.
鄭然斗,韓世範,李正閏 三陟大學校 1999 論文集 Vol.32 No.1
This paper presents a study on the effect of the operating conditions on the traction characteristics of differential type traction drive. The cross roller type traction drive was used to observe the speed ratio and the power transmission efficiency of traction drive. The effects of spin motion and the power transmission efficiency between two tapered rollers of the traction drive are discussed and experimented. It is shown that the power transmission efficiency can increase up to 53% in the case of an experimental traction drive. the traction surface roughness of the tapered roller was also measured and observed by scanning electron microscope. On the basis of these results, the effects of specific sliding, roller speed, load, and contact pressure were clarified to a considerable extent.