轧机液压伺服位置系统的自适应输出反馈控制

针对具有不可测状态、未知参数和非线性的轧机液压伺服位置系统,提出一种基于高增益观测器和参数估计器的自适应输出反馈控制算法.所构造的高增益观测器不依赖于系统输入和参数估计值,它只用于估计系统状态,所设计的动态反馈控制器包括:用于保证系统稳定性的主反馈部分和抵消外部扰动和一些不确定性的补偿部分.理论分析表明,所提出的控制算法能够保证闭环系统的所有信号有界,且系统状态及其估计误差的最终收敛边界依赖于观测器的高增益值.以某650 mm可逆冷带轧机液压伺服位置系统为例进行仿真,仿真结果验证了所提出算法的有效性.

Adaptive output-feedback control for hydraulic servo position system of rolling mill

A high-gain observer and parameter estimator based adaptive output feedback control algorithm is proposed for hydraulic servo position system of rolling mill which contains unmeasurable states,unknown parameters and nonlinearies.The constructed high-gain observer is independent on control input and estimates of the unknown parameters,which is only employed to estimate the system state.The designed feedback controller contained two parts: the main feedback part which was used to ensure the system stability and the compensative part which was used to attenuate the external disturbance and some uncertainties.It can be proved that the proposed algorithm can guarantee all the signals of the resulting closed-loop system are bounded,and the boundaries of the system state and its estimation error are defined by the given high-gain.Finally,simulation was carried out on the hydraulic servo position system of 650mm reversing cold-strip rolling mill.And the simulation results show the validity of the proposed method.