In hot plate and strip rolling process, the essence of both the transverse and longitudinal thickness control is the control of loaded gap between the rollers. So, there will be a coupled link between these two thickness control loops, being a coupled two-input two-output process. Aimed at the problem that the multi-axis coupling factor cannot be considered by using traditional PID control, a LQG control strategy was proposed, where the control of the two thicknesses were taken as a integrated control system to design a LQG controller for thickness control of plate and strip. In the case of white noise input, the simulation was carried out with software Matlab. The simulation result showed that this control method could effectively suppress the influence of roller eccentricity, thickness deviation of raw material and other disturbances, and the control precision of transverse and longitudinal thickness was fully improved with the integrated control system, providing a new and effective method for the control of transverse and longitudinal thickness.%阐述在板带热轧过程中,板带横向厚度控制和板带纵向厚度控制实质上都是对有载辊缝的控制,因此,两者的各自回路之间必然存在耦合关系,是一个耦合的双输入双输出过程.针对采用传统PID控制解决该问题具有不能将多轴耦合因素考虑进来的局限性,提出一种LQG控制策略.把板带横向厚度控制和板带纵向厚度控制看作一个综合控制系统,为板带横向和纵向厚度综合控制系统设计LQG控制器,在输入白噪声的情况下,用Matlab软件进行仿真.仿真结果表明,该控制方法能有效地抑制轧辊偏心和来料厚度偏差等干扰的影响,充分提高板带横向和纵向综合控制系统的控制精度,为热轧板带横向和纵向厚度综合控制提供新的有效方法.
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