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烘丝机动态特性建模及基于模型的出口水分优化控制方法
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摘要
烘丝过程存在较强的非线性、不确定性、耦合性和滞后性的特点,目前的烘丝水分控制主要采用PID算法并加以一些前馈补偿及顺序逻辑控制手段,各个控制回路之间相对独立,协调性差,难以做到真正的闭环自动控制。针对烘丝生产过程的不同阶段及不同的生产工艺模式,本文提出了一种能描述依存于进料量与进料水分的过程动态特性的模型,基于所构建的模型提出了一种基于模型预测的烘丝机出口水分控制方法,可保证较高的控制精度要求和控制平稳性、降低干头和干尾料的数量、提高卷烟生产质量。
The cut tobacco drying process possesses strong nonlinearity, uncertainty, coupling and longer time lag. Currently, the PID control algorithm combined with some feedforward-compensation tricks plus sequential logic control strategies have been mainly used in cut tobacco drying process control. However, the control loops are relatively independent each other, so the control system has poor coordination performance, and it is hard to implement real closed-loop automatic control for the drying process. For the different production processes and requirements of the drying process, the models that can describe the feed rate and inlet moisture–dependent dynamic behavior of the process are proposed, and based on the models a predictive control method was designed in this paper to ensure the higher requirements of control accuracy and smoothness. The presented method may largely reduce the amount of over-dried cut tobacco during start and finish process of drying operation, and improve the quality of cigarette.
引文
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