轧机两侧液压伺服位置系统自抗扰同步控制

针对轧机传动侧和操作侧液压伺服位置系统存在不一致性而引起两侧位置不同步的问题, 提出一种自抗扰同步控制方法.首先建立了液压伺服位置同步系统动态机理模型, 并在考虑两侧位置伺服系统都具有参数摄动及外负载波动的情况下, 设计了扩张状态观测器对同步系统中不确定性和不一致性进行估计, 并采用状态误差反馈律给予主动补偿, 同时消除同步误差. 仿真和实验结果表明, 所提出的同步控制方法能够使两侧液压伺服位置系统动态响应和稳态特性保持一致, 并提高了单侧子系统的动态性能及抗干扰能力.

Active disturbance rejection synchronous control for both sides of hydraulic servo position system of rolling mill

An active disturbance rejection synchronous control is proposed for hydraulic servo position systems on driving side and operating side of a rolling mill to deal with the asynchronous pressing down positions due to uncertainties and inconformity between position systems on both sides. The quality of strip thickness and shape are impaired by the asynchronous hydraulic cylinder displacements on two sides. The dynamical mechanism model of the hydraulic servo synchronous system is built. Considering internal parameters variation and external load force fluctuation existing in the systems on both sides, we design an extended state observer to estimate the total uncertainties and inconformity of the synchronous system, and employ a state error feedback law to compensate the total disturbance actively for eliminating the synchronous error. A simulation is carried out on the hydraulic servo system of an 1850 mm reversible aluminum cold rolling mill, and an experiment is conducted on the hydraulic servo synchronous system of a 400 mm reversible cold strip mill for investigating the active disturbance rejection synchronous control. The results validate the controller ability in keeping the same dynamic response and steady state characteristics of driving side position system with that on the operating side, and demonstrate the improvement on the dynamic performance and the robustness of subsystems.