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전용주,최두철,윤종필,김상우 제어로봇시스템학회 2010 제어로봇시스템학회 국내학술대회 논문집 Vol.2010 No.5
This paper proposed an algorithm to detect defects such as bleeding defect in slab through the use of image processing. The surface of a slab is partially covered with scales composed of oxidized substance. Because these scales can be visually similar to defects, and because the surface features of slab images vary under different lighting conditions, defect detection can be difficult. To minimize the influence of scales and to improve the accuracy of detection, anew detection method is proposed. The bleeding defects are extracted by wavelet transform. Also, the morphological features are used fer defect detection of bleeding defects. Finally, the experimental results show the effectiveness of the proposed algorithm.
몰드 오실레이터 이중구조 실린더의 정현파 진동 특성을 이용한 위치동기화 알고리즘 개발
김승훈,최두철,공남웅,김상우,Kim, Seung Hun,Choi, Doo Chul,Kong, NamWoong,Kim, Sang Woo 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.8
Improvement in the control strategy for continuous casting is a crucial requirement to enhance the slab's quality and to increase productivity. The mold oscillator adopts the dual cylinders due to its heavy weight, so the synchronized motion of two cylinders is an important aspect when precise control is needed. The conventional method uses the master-slave control applied to the valve input reference, but the synchronization performance should still be improved. This paper proposes a novel synchronization algorithm for dual cylinders used in a mold oscillator. The master-slave concept is applied to the target reference position, that is, the slave target reference position is controlled to match the slave cylinder's position with the master cylinder's position. In the simulation based on a Simulink model, the proposed algorithm shows a better synchronization performance in aspect of the mean of the absolute error and the peak synchronization error.