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디지털 제어 기법을 이용한 형상기억합금 와이어의 온도 제어에 관한 연구
정상화(Sang-Hwa Jeong),김주환(Ju-Hwan Kim) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
Actuator of the robot is an important technology. One of the possible actuator is to drive by shape memory alloy. Shape memory alloy has the excellent corrosion and the heat resistance. But, there is bad performance of repeatibility and the control scheme of SMA is difficult. In this paper, the control of SMA wire using digital control method is studied. The SMA wire is segmented by thermoelectric module(TEM). The temperature control program of segmented SMA wire is developed by using LabVIEW. Temperature control module measures the temperature of TEMs through thermocouple. Relay control module turns on or off the relay by comparing the measured temperature with the threshold temperature. To evaluate the performance of SMA wire using digital control method, the reaction time and the displacement are measured in each segment.
초음파를 이용한 이송 시스템의 광소자 픽업장치의 제작 및 동특성
정상화(Sang-Hwa Jeong),이상희(Sang-Hee Lee),김광호(Gwang-Ho Kim),신상문(Sang-Moon Shin),김주환(Ju-Hwan Kim) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
Recently, as the infocomindustry is developed, the semiconductor industry as well as the optical industry such as the optical communication and the optical instrument is developed rapidly. The transmission, storage and processing of information have been reaching an limit because amounts of information increase sharply. demands of optical components are growing due to demands of faster network. The transport and inspection process are time consuming and the error rate is high, because this process is not automated in case of an optical lens. In this paper, the pick-up system which can grasp optical elements transferred by the ultrasonic transport system and move them to other transport system is developed. The inspection system which distinguishes between the existence and the nonexistence of a defect is connected easily to pick-up system. The pick-up system separates the optical glass lens by results of the inspection. The automation program is developed by visual c++ programming.
초음파 이송 시스템에 사용되는 광소자 픽업 장치의 동특성
정상화(Sang Hwa Jeong),신상문(Sang Moon Shin),김광호(Gwang Ho Kim),이상희(Sang Hee Lee),김주환(Ju Hwan Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Recently, as the infocomindustry is developed, the semiconductor industry as well as the optical industry such as the optical communication and the optical instrument is developed rapidly. The transmission, storage and processing of information have been reaching an limit because amounts of information increase sharply. demands of optical components are growing due to demands of faster network. The transport and inspection process are time consuming and the error rate is high, because this process is not automated in case of an optical lens. In this paper, the pick-up system which can grasp optical elements transferred by the ultrasonic transport system and move them to other transport system is developed. The inspection system which distinguishes between the existence and the nonexistence of a defect is connected easily to pick-up system. The pick-up system separates the optical glass lens by results of the inspection. The automation program is developed by visual c programming.
광소자 정렬용 극초정밀 다축 스테이지의 구동 메커니즘에 관한 연구
정상화(Sang-hwa Jeong),김광호(Gwang-ho Kim),차경래(Kyoung-rae Cha),이경형(Kyoung-hyoung Lee),송석(Suk Song) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.1
The communication through optical fiber is taking an important role of the expansion of communication network with excellent transmitting rate and quality. As the optical communication is introduced to the backbone network at first and becomes a general communication method of network, the demand of kernel parts of optical communication such as PLC(Planar Light Circuit), Coupler, and WDM(Wavelength Division Multiplexing) element increases. The alignment and the attachment technology are very important in the fabrication of optical elements. In this paper, the driving mechanism of ultra precision stage is studied with the aim of optimal design of stage. The travel and the resolution of stage are investigated. The hysteresis of the stage is generated because of PZT actuator. The hysteresis and the inverse hysteresis are modeled in X, Y, and Z-axis motion. The input data of desired displacement of the stage according to input voltage is obtained from the inverse hysteresis equation. In the result of experiments with the input data, the errors due to hysteresis are well compensated.
정상화(Sang Hwa Jeong),이상희(Sang Hee Lee),김광호(Gwang Ho Kim),김재상(Jae Sang Kim),김종태(Jong Tae Kim) 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.3
Roll forming process is one of the most widely used processes in the world for forming metals. It can manufacture goods of the uniform cross section throughout the continuous processing. However, process analysis is very difficult because of the inherent complexity. Therefore, time is consuming and much money are needed for manufacturing goods. In order to overcome this difficulty, a new computational method based on the rigid-plastic finite element method is developed for the analysis of roll forming process. In this paper, the design of roll forming process and the simulation are performed to manufacture the upper member at under rail composed of three members. The cold rolled carbon steel sheet(SCP-1) is used in this simulation, and a flow stress equation is set up by conducting the tensile test. The upper member is designed using two types of design for a excellent design. Each types are simulated and compared with the strain distribution using SHAPE-RF software. In addition, the numerical magnitude of bow and camber which are the buckling phenomenon is estimated.
정상화(Sang-Hwa Jeong),신상문(Sang-Moon Shin),김광호(Gwang-Ho Kim),이상희(Sang-Hee Lee),김주환(Ju-Hwan Kim) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
Practical scope of optical elements broadens considerably such as the optical instrument, the optical communication and electronic products. Also, demands of optical components are growing due to increase of productivity. Object transport systems are driven typically by the magnetic field and the conveyer belt. However, conventional transport systems are not adequate for transportation of optical elements and semiconductors. Because conveyor belts can damage precision optical elements by the contact force and magnetic systems can destroy the inner structure of semiconductor by the magnetic field. In this paper, the object levitation transport system using ultrasonic wave is developed for transporting precision elements without damages. Principle of object transportation is similar ultrasonic motor's one. This transport system is using 2-mode ultrasonic wave excitation and modes shapes of flexural beam are evaluated by the theoretical analysis. Direction of object transportation is changed by phase difference.
초음파 이송 시스템에 사용되는 광소자 픽업 장치의 동특성
정상화(Sang Hwa Jeong),신상문(Sang Moon Shin),김광호(Gwang Ho Kim),이상희(Sang Hee Lee),김주환(Ju Hwan Kim) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
Recently, as the infocomindustry is developed, the semiconductor industry as well as the optical industry such as the optical communication and the optical instrument is developed rapidly. The transmission, storage and processing of information have been reaching an limit because amounts of information increase sharply. demands of optical components are growing due to demands of faster network. The transport and inspection process are time consuming and the error rate is high, because this process is not automated in case of an optical lens. In this paper, the pick-up system which can grasp optical elements transferred by the ultrasonic transport system and move them to other transport system is developed. The inspection system which distinguishes between the existence and the nonexistence of a defect is connected easily to pick-up system. The pick-up system separates the optical glass lens by results of the inspection. The automation program is developed by visual c programming.