液压位置伺服系统滑模自抗扰控制器设计

主要研究了驱动连铸结晶器的液压伺服系统的精确位置跟踪控制问题。由于液压伺服系统的某些内部参数是时变且不可测的,同时外部负载力也随时间变化使得系统动态模型不精确,从而影响了系统的控制效果。针对这一问题,提出了一种基于滑模控制的自抗干扰控制器的设计方法,利用扩张状态观测器把系统内部参数和外部负载力的不确定性观测出来,从而有效地抵消了系统的不确定性。根据工程实际中的参数进行仿真研究,其结果表明这种控制方法具有很好的全局鲁棒性,并且提高了位置跟踪的精度。

Design of Sliding Model Active Disturbance Rejection Controller for Hydraulic Position Servo System

A position control method for hydraulic servo system of continuous casting mold is studied.Because the system has large extent of model uncertainties including big changes in load and hydraulic parameters,which are unmatched,so it is very difficult to control very well.An approach active disturbance rejection control combined with sliding mode control is proposed.The extended state observer is used for observing internal parameters uncertainties and external disturbances,so that the uncertain of the system is decreased efficiency.Using the actual parameters simulation,the results show that the control approach has nice global robustness and improves position tracking accuracy.