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손붕호,노용래,이영호 한국소음진동공학회 1994 소음 진동 Vol.4 No.1
Chatter vibration of a rolling machine in steel plants has a significant effect on thickness quality of the products. The cause and mechanism of the mill chattering is addressed through measurement of vibration and dynamic torque. An FFT system and an FM telemetry system are employed to collect data at several locations of possible damages. The results reveal the followings as sources of the mill vibration. The first is defects in roller bearings of a work roll chock. The second is instability of an oil film bearing in a backup roll chock, which has been investigated with a theoretical model describing the phenomenon. Dynamic torque is not the direct cause of mill vibration but rather influenced by the vibration. Appropriate treatment methods are suggested to address each of the above sources.
손붕호,박형국 제어로봇시스템학회 2009 제어로봇시스템학회 국내학술대회 논문집 Vol.2009 No.9
Mixed acid, which consist of HF and HNO3, is used as a good etchant for silicon dioxide in the pickling process of stainless steel. On-line measurement of concentrations for such mixed acids is essential to improve the quality of products and cut down the cost of production. Near-infrared(NIR) spectroscopy has been utilized to demonstrate its feasibility for the measurement of major components of mixed acid including the metal ions. Synthetic mixtures that is the concentration range of HF over 0.5∼2.5 wt%, HNO3 over 10∼22 wt% and that of Fe ion over 1∼5 wt% were prepared and measured the absorption intensity in the NIR regime. Chemometrics was utilized to differentiate the spectral characteristics as well as to quantity each component for the mixtures.