冷带轧机液压伺服位置系统的鲁棒输出反馈控制

Robust output-feedback control for hydraulic servo-position system of cold-strip rolling mill

针对具有参数不确定、不可测状态和未知外负载力的冷带轧机液压伺服位置系统,提出一种基于未知输入观测器的鲁棒输出反馈控制方法.首先,将含有外负载力的干扰项视为未知输入,构造未知输入观测器,然后基于所构造的观测器设计鲁棒输出反馈控制器.理论分析表明,所提出的控制方法能够保证闭环系统是一致有界稳定的,并具有鲁棒H∞性能.最后对某个650mm可逆冷带轧机液压伺服位置系统进行仿真研究,结果验证了所提出方法的有效性.

A robust output-feedback control algorithm with unknown input observer is presented for the hydraulic servo-position system in a cold-strip rolling mill with uncertain parameters, immeasurable states and unknown external load forces. The disturbance term containing the unknown external load forces is regarded as an unknown input, for which we build an observer. A robust output-feedback controller is then designed with this observer. Theoretical analysis shows that the resulting closed-loop system is uniformly bounded stable, and has robust H-infinity performance. A simulation is carried out on the hydraulic servo position system of a 650 mm reversing cold-strip mill, results show the validity of the proposed algorithm.