Research on Time Delay Control for the Vertical Vibration Characteristics of Roll System

摘要

For the vibration problem of rolling mill under the influence of dynamic characteristics of hydraulic system, time delay state feedback is introduced, and a vibration control model of roll system is established based on the nonlinear stiffness constraint of hydraulic cylinder. The amplitude frequency response of the system is obtained by the method of multiple scales. The actual parameters of rolling mill are used to analyze the impact law of time delay parameters on the mill roll system amplitude frequency characteristics and time domain features. Founding that with the increase of the control gain coefficient, the stability of the roll system is improved. The change of time delay makes the system show complex nonlinear dynamic behavior. Therefore, it is very important to choose the appropriate time delay parameter to suppress the rolling mill vibration, which provides a theoretical reference to control mill stability movement.