QFT在冷轧机卷取张力控制中的应用

定量反馈理论(QFT)是参数不确定性系统鲁棒控制比较成功的设计方法。在实际轧制过程中,由于受轧机压下系统、主传动系统的耦合影响以及带材加工来料好坏、轧辊磨损程度等其他机械设备状态的不确定性因素制约,冷轧机卷取张力系统保持恒张力控制是比较困难的。本文将QFT理论设计方法应用于某六辊可逆冷轧机的卷取张力系统。仿真结果表明,基于QFT鲁棒控制器在改善系统频域跟踪指标和鲁棒稳定性的同时,能够获得较好的控制效果,减小了系统的超调量。

Application of QFT in cold mill coiling tension control system

Quantitative Feedback Theory(QFT) is a frequencydomain-based robust control design approach that was developed in the early 1970s and has received considerable attention over the past two decades.Considiring the affection of the concerned systems and the uncertainties brought by mechanical factors,a robust controller was designed through QFT in this paper.Design results and simulation analysis reveal the bright application of QFT approach in the tension control system.