冷带轧机两侧压下系统自适应同步控制研究

Research of Adaptive Synchronous Control for Both Sides of Pressing Down System of Cold Rolling Strip Mill

驱动冷带轧机的液压伺服系统由伺服阀和不对称液压缸组成。建立了某650mm冷带轧机的位置系统的非线性数学模型,并且给出了其参数。首先针对操作侧和传动侧压下位置子系统简单设计了控制器。由于两侧子系统的参数不同,例如总的质量、摩擦阻尼系数和液压缸活塞的初始位置不同等,会造成压下位置的不同步。为了解决这一问题,利用模型参考自适应控制的思想,设计了压下位置自适应同步控制器,该控制器也可用于倾辊控制。仿真结果表明两侧的位置误差能够很好地趋近于零或倾辊给定信号,系统的同步控制精度能够得到有效保证,并能够在一定程度上改善出口带材的板形质量。

The hydraulic servo system of cold rolling strip mill is composed of servo valve and single-rod cylinder. A nonlinear mathematical model of the position system of a 650mm cold wiling mill is established, and its parameters are given. The controllers of pressing down position subsystems are designed simply for drive side and op- erating side. Because of different parameters of both side subsystems, such as total mass, friction damping coeffi- cients and initial position of pistons, pressing down positions are usually asynchronous. To solve this problem, adap- tive synchronous controller is designed to compensate the inconsistent characteristic by using Model Reference Adaptive Control （MRAC） principle. It can also be applied to tilting roll control. Simulation results are given to show that position error of both sides will tend to zero or track tilting roll reference signal very well. Synchronous precision of the system is guaranteed effectively, and the quality of strip shape can be improved in a certain extent.