基于吸振器控制的轧机辊系时滞反馈研究

Research on Time Delay Feedback of Roll System Based on Vibration Absorber Control

考虑四辊轧机液压缸非线性弹簧力约束的因素,建立带有吸振器的两自由度轧机辊系模型。引入时滞反馈控制函数,设计带吸振器的轧机辊系振动位移、振动速度时滞反馈控制方程。通过分析轧机辊系振动极限环幅值和幅频特性的稳定性,得到不同反馈增益参数和时滞量参数对轧机辊系主系统的影响规律。适当地增大反馈增益系数g 1和g 2,减小时滞量系数τ1和τ2,可以改善系统的稳定性和收敛性。

Considering the nonlinear spring force constraint of the four-roll mill hydraulic cylinder,a two-degree-of-freedom rolling mill roll model with a vibration absorber was established.Time-delay feedback control function was introduced.Time-delay feedback control equation for vibration displacement and vibration velocity of rolling mill roller system with vibration absorber was designed.By analyzing the stability of the amplitude limit and amplitude-frequency characteristics of the rolling mill s vibration limit loop,the influence of different feedback gain parameters and time-delay parameters on the main system of the rolling mill roll system is obtained.Appropriate increase of the feedback gain coefficient g 1 and g 2,reduce the delay coefficientτ1 andτ2 can improve the stability and convergence of the system,which provides theoretical support for suppressing mill vibration.