前馈厚度控制的外部自激励定量反馈调节

分析了板材轧制过程中出口厚度变化的成因.将不确定扰动的影响归结为轧机刚度系数摄动和轧件塑性系数摄动,建立了双摄动厚度控制模型.综合考虑轧机系统的外部不确定扰动,针对轧制道次间的不确定性,在频域内将板厚信息转化为轧机系统边界性能指标,设计抑制前馈扰动的外部自激励定量反馈控制器.仿真实验表明,设计的控制器能有效抑制轧制过程中的外部扰动,具有良好的鲁棒性能,并能直观保证系统调整时的鲁棒稳定性,适于工业生产.

External excited adaptive QFT tuning for feed-forward AGC systems

Causes for plate thickness variation in the rolling process were analyzed.Uncertain disturbances in the rolling process were attributed to mill stiffness modulus perturbation and stock plastic coefficient perturbation,and then a dual perturbation automatic gauge control(AGC) theory was established.Considering the external disturbances of the rolling mill system,especially uncertainties between passes,the thickness information was converted to boundary specifications in the frequency domain.For disturbance attenuation,a controller based on the external excited adaptive quantitative feedback theory(QFT) was designed with loop shaping.The controller can effectively suppress external disturbances in the rolling process,and has a good robust performance,which can ensure robust stability in system adjustment.The proposed method is suitable for industrial production.