变结构控制方法在热轧卷取机踏步控制系统中的应用

Application of a Variable Structure Approach on Step-by-step Control System for Coiler of Hot Rolling Mill

以往热轧卷取机在卷取开始时,由于带钢头部搭头部位与助卷辊发生冲撞,产生过大的冲击。笔者参考实际现场卷取工艺,研制了电液踏步控制系统,以实现助卷辊对台阶的自动回避。针对实验室建造的热轧卷取机踏步控制半物理实验模型,设计了一种滑模变结构控制器,通过设计切换函数以保证系统具有良好的动态特性。仿真结果表明:变结构控制能够有效地克服系统变参数的影响,可以取得较高的伺服跟踪效果,使系统具有较强的鲁棒性和良好的动态性能。

Because of the collision between lap of strip steel and unit roller, too big an impact occurs during the initial coiling of previous coiler of hot rolling. Based on the real work process of coiler at worksite, an electro-hydraulic step-by-step system was developed in order that unit roller can evite the step automatically. A variable structure approach using sliding mode was presented for the mechanical model of step-by-step control system for coiler of hot rolling mill which was built at laboratory used for research work. The switching function was designed to ensure the system to have better dynamic performance. Simulation results show that the proposed approach may give rather accurate servo tracking result and is fairly robust to the system parameter variation and has better dynamic performance.