A study on the stability criterion of the control systems for the drive systems in rolling mill plants

압연구동제어계(壓延驅動制御系)의 안정도(安定度) 판정법(判定法)에 관한 연구

It is necessary for us to maintain good the quality of products in iron and steel making process, especially in the rolling mill plants. Thus, we need check the stability criteria of control systems. In the frequency domain, the whole system including controllers can be identified using FFT analyzer. But this method is not adequete where precise identification is demanded. Thus a way to complement the defects In the frequency domain analysis using FFT analyzer is introduced. And In the time domain, to establish the stability criteria on the control systems, the assumed parameters obtained using least square method are presented in this report.