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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.
Preview Algorithm을 이용한 V-홈 궤적의 자동추적에 관한 연구
김성훈,조택동 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2
Automatic seam tracking technique has been developed recently to achieve the welding automation using robot and various weld seam finder. This technique is essential for welding automation because unexpected distortion of weld line caused by heat input can occur during welding process. In this research, laser displacement sensor is used as a seam finder in the automatic tracking system. X-Y moving table manipulated by ac servo motor controls the position and velocity of the torch-and-sensor part. DC motor controls the position and velocity of the torch-and-sensor part. Following the weld line, the informations of joint position detected by laser displacement sensor are fedback to computer where the rotating angle of the torch and X-Y table input pulse frequency are calculated. X-Y table controls the position of sensor and relative position of torch is controlled by dc motor which is mounted at sensor-and-torch part(simulation). Sensor is always ahead of torch to preview the weld line. Preview control was added to conventional PI and LQ control to enhance the tracking performance. The simulation results show that, when preview control is applied, the tracking performance is improved significantly. Form the experimental results, we could see the possibility that the laser displacement sensor can be used as a seam finder in welding process and that the preview controller combined to conventional controller can give a good performance in tracking system as a controller of torch rotation angle.
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.
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.
조택동,이호영,양상민 충남대학교 산업기술연구소 2002 산업기술연구논문집 Vol.17 No.1
The measuring method of large object using the pattern matching is discussed in the paper. It is hard and expensive to get the complete 3D data when the object is large or exceeds the limit of measuring devices. The large object is divided into several smaller areas and is scanned several times to get the data of all the pieces. These data are aligned to get the complete 3D data using the pattern matching method. The point pattern matching method and transform matrix algorithm are used for aligning. The laser slit beam and CCD camera is applied for experimental measurement. Visual C++ on Windows 98 is implemented in processing the algorithm.
조택동 忠南大學校 産業技術硏究所 1991 산업기술연구논문집 Vol.6 No.1
아크용접공정을 모델링하여 유한 차분법(FDM)으로 해석하였다. 비접촉 센서의 용접온도 감지를 이용한 용접공정제어에 기초적 자료를 제공함에 목적을 두고 온도분포의 과도적 현상과 그에 따른 용접부의 기하학적영향을 시간 및 용접거리의 관계에서 조사하였다. 용융부의 최대 용입깊이와 폭, 또는 열영향부의 최대 너비가 발생하는 시간과 아크가 그 위치에 도달하는 시간사이에는 상당한 시간지연이 존재하고, 용접조건이 갑자기 변하였을 때 불완전한 용접이 발생함을 확인하였다. 수치해석에 의한 결과와, 용접된 부분에서 채취한 금속시편의 측정치가 매우 잘 일치하였으며, 적외선 센서에 의한 과도적 온도분포의 측정도 동일한 결과를 보였다.