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초전도 모터의 상태진단을 위한 데이터 신호 무선처리 기법개발
서경철(K.C. Seo),이민래(M.R. Lee),이준현(J.H. Lee),권영길(Y.K. Kwon),손명환(M.H. Shon) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
This research is to development advanced health(condition) monitoring system of superconducting motors. Development of advanced condition monitoring systems offers the prospect of improved performance, assessment, and operation, simplified design, enhanced safety, and reduced overall cost of advanced and next generation superconducting motor. For advanced and next generation superconducting motor design, the opportunity exists to develop and implement real-time and continuous monitoring systems by integrating wireless and computational technique.<br/> Generally, condition monitoring and control of temperature is essential for managing the superconducting motor components, rotor and structures. In this research, development of advanced monitoring in low temperature and high speed operating environments offers the potential to greatly improve the control of harsh environments. In conventional method, slip rings have been used to acquire data from these sensors. However, the increase of sensors leads to vibration of the rotation axis and noise signals due to kinematics contact. In this study, the wireless data acquisition technique was employed to develop more stable monitoring system adequate for high speed rotating system.
CFRP 판재의 비파괴 평가를 위한 비접촉식 초음파 평가 기법
최상우(S. W. Choi),서경철(K. C. Seo),이준현(J. H. Lee),변준형(J. H. Byun),조윤호(Y. H. Cho) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Fiber reinforced plastic materials should be inspected in fabrication process in order to enhance quality by preventing defects such as delamination and void. Generally, ultrasonic technique is used to evaluate CFRP. In conventional ultrasonic techniques, transducer should be contacted on FRP through couplant during evaluation in service and after fabrication. However, non-contact measuring technique should be developed to apply ultrasonic testing technique in fabrication process. In this study, laser-generated ultrasonic technique was applied for non-contacting generation of guided wave in CFRP plate. Velocities of laser-generated guided wave were evaluated for various fiber orientation. In addition, air-coupled transducer was used for non-contacting receiving guided wave of selected mode.