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주기인식 검출방식을 이용한 장거리 정밀 초음파 거리측정 시스템 개발
이동활(Dong Hwal Lee),김수용(Su Yong Kim),윤강섭(Kang Sup Yoon),이만형(Man Hyung Lee) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.8
In this paper, we proposed a new ultrasonic distance measurement system with high accuracy and long range. To improve accuracy and enlarge range, the time of flight of ultrasonic is calculated by the period detecting method. In the proposed ultrasonic distance measurement system, the ultrasonic transmitter and receiver are separated but synchronized by RF(Radio frequency) module. The experiment has been implemented from short distance 1m to maximum available distance 30m. And the period detecting method is compared with the conventional threshold level method. Experimental results show the accuracy and range of the distance measurement are improved by this period detecting method.
판재의 드로우비드 성형시 비드표면처리와 비드형상이 인출 및 마찰특성에 미치는 효과
이동활 ( Dong Hwal Lee ),류종수 ( Jong Soo Ryu ),정우창 ( Woo Chang Chung ),문영훈 ( Young Hoon Moon ) 한국열처리공학회 2005 熱處理工學會誌 Vol.18 No.2
N/A In sheet metal forming, drawbeads are often used to control uneven material flow, which may cause defects such as wrinkles, fractures, surface distortion and springback. Appropriate setting and adjusting of the drawbead force is one of the most important parameters in sheet forming process control. Therefore in this study, drawbead test was performed at various bead surface treatment conditions to clarify the frictional characteristics between sheet and drawbead. Furthermore, the differences in drawing force between circular and rectangular shape beads have also been measured to estimate the effectiveness of bead shape on the material flow control. The results show that drawing and friction characteristic were strongly influenced by surface treatments of bead and bead shapes.