基于模型参考自适应Smith预估器的反馈式AGC厚度控制系统  

Feedback automatic gauge control system using model reference adaptive Smith predictor

作　　者：李迅[1,2] 宋东球[1] 喻寿益[1] 桂卫华[1] 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410083 [2]西南铝业(集团)有限责任公司,四川重庆401326

出　　处：《控制理论与应用》2009年第9期999-1003,共5页Control Theory & Applications

基　　金：国家自然科学重点基金资助项目(60634020)

摘　　要：针对具有纯时间延迟特性的反馈式AGC(automatic gauge control)系统,利用Smith预估器对纯时间延迟具有补偿作用的原理,建立了模型参考自适应Smith预估器反馈式AGC控制系统模型,给出了控制系统结构.推导了自适应调节律和设计算法,结合预估器模型,计算得到轧件出口厚度偏差值的表达式.仿真结果表明,模型参考自适应Smith预估器反馈式AGC系统对铝薄板带材轧制出口厚度偏差控制具有很好的控制效果,解决了反馈式AGC厚度控制由于纯时间延迟特性对控制性能产生很大影响的问题,消除了出口厚度波动现象,响应速度加快,可以满足高精度铝薄板带材轧制生产的控制要求.Based on the compensating principle of Smith predictor for the time-delay process, we build a modelreference-adaptive（MRA） Smith-predictor feedback control model for the automatic-gauge-control（AGC） system. The structure of the control system is determined, the design algorithm and the adaptive modulation principle are derived. Combining the MRA Smith-predictor feedback with the AGC control model, we can control the thickness-deviation at the output. Simulation results show that the AGC system with the MRA Smith-predictor feedback exhibits an excellent performance in controlling the thickness deviation of rolled aluminum strips. The limitation on the time-delay which originally affects the control performance is now eliminated, the thickness-variation at the output is removed, and the response rate is raised. In summary, the product specifications of aluminum strips are satisfied.

关 键 词：轧制 SMITH预估器 反馈式AGC 模型参考自适应 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]