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趙澤東 충남대학교 공업교육연구소 1981 論文集 Vol.4 No.2
For a triangular rib loaded by uniformly distributed load, the stress distributions all over the field as well as along the some sections were investigated by a photoelastic experiment. The rib tested had a right-angular shape and the photoelastic material used to make model was epoxy resin. Experimental results showed that the stresses on horizontal and inclined boundaries were constant and the stress state was similar to that of triangular truss loaded at its end.
조택동,양상민,전진환 대한용접접합학회 1998 대한용접·접합학회지 Vol.16 No.6
A CCD camera with a laser stripe was applied to realized the automatic weld seam tracking. The 3-dimensional information obtained from the vision system made it possible to generate the weld torch path. The adaptive Hough transformation was used to extract laser stripes an to obtain specific weld points. It takes relatively long time to process image on-line control using the basic control using the basic Hough transformation, but it has a tendency of robustness over the noises such as spatter. For this reason, it was complemented with adaptive Hough transformation to have an on-line processing ability for scanning specific weld points. The dead zone, where the sensing of weld line is impossible, was eliminated by rotating the camera with its rotating axis centered at the weld torch. When weld lines were detected, the camera angle was controlled in order to get the minimum image data for sensing of weld lines. Consequently, the image processing time was reduced.
조택동,서송호,양상민 한국군사과학기술학회 1999 한국군사과학기술학회지 Vol.2 No.2
A transmitting antenna mounted on the naval vessels can be easily exited by exogenous disturbances such as wave and impact. Gimbal system need for the controller to maintain the robust performance against various modeling uncertainties and disturbances. PI controller, however, cannot supply good robust performance under situation. Thus a robust $H_{\infty}$ control scheme is used to ensure a specified dynamic response under above conditions. Gimbal system controlled simplified as 2 DOF system that ignored coordinate co-relations of each direction and hydraulic system is linearly modelled. In this paper, we compared those of simulation to the results of experiment and H$_{\infty}$ controller, proposed, showed the good response and stability than PI controller.
GMAW에서 아크 빛을 이용한 실시간 용접품질 모니터링에 관한 연구
조택동,양상민 대한용접접합학회 2000 대한용접·접합학회지 Vol.18 No.4
Gas metal arc welding(GMAW) is regarded as one of the best candidate for welding automation in industrial joining application. It is important to monitor the weld quality for the high performance weld automation. In GMAW, weld quality is closely related to arc stability especially. In this paper, arc light signal is measured and spectrum analyzed to the detect the variation of the weld quality. The FFT of the signal showed that the amplitude variance of FFT power spectrum was very large in poor weld process such as the decrease of weld bead width and height. The results show that it is possible to detect the weld defect position in weld process.
GMAW에서 시각센서를 이용한 용접선 정보의 추출과 와이어 승급속도의 제어에 관한 연구
조택동,김옥현,양상민,조만호 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.6
A CCD camera with a laser stripe was applied to realize the automatic weld seam tracking in GMAW. It takes relatively long time to process image on-line control using the basic Hough transformation, but it has a tendency of robustness over the noises such as spatter and arc light. For this reason. it was complemented with adaptive Hough transformation to have an on-line processing ability for scanning specific weld points. The adaptive Hough transformation was used to extract laser stripes and to obtain specific weld points. The 3-dimensional information obtained from the vision system made it possible to generate the weld torch path and to obtain the information such as width and depth of weld line. We controled the wire feeding rate using informations of weld line.