造纸过程横向定量的多变量快速模糊解耦和鲁棒时滞控制策略

消费者对纸张品质要求的提高和高速印刷机的引入对纸张纤维的分布匀度提出了更加严格的要求。本项目拟围绕基于稀释水流浆箱的纸张横向（CD）定量控制策略展开研究，探索通过在线控制手段来提高纸张定量均匀分布的有效方法。分析CD定量控制的耦合特点和时滞特性，提出一种多变量快速模糊解耦策略和实时鲁棒时滞控制算法，研究利用模糊解耦思想将高维多变量控制问题转化为单回路群控制问题的一般方法，以及通过极小化灵敏度目标函数来设计鲁棒Smith预估控制器的新方法；给出一种CD定量数据与稀释水阀之间的时空对位新方法，研究利用小波与阈值去噪和压缩感知技术得到全幅定量信息的新途径；探索浓度稀释逆向响应的产生机理和消除措施，给出一套基于稀释水流浆箱的纸张CD定量综合控制策略。旨在解决基于稀释水流浆箱的CD定量控制中因多变量、强耦合、大时滞和时空错位等因素导致的控制难题，为先进CD定量控制系统设计提供理论参考和技术指导。

With the improving requirements of consumers to the quality of paper products and the introduction of the high speed printers, more rigorous performances to the fiber uniform distribution of paper sheet are suggested. A research on the paper CD (Cross Direction) basis weight control strategies based on dilution water headbox is carried out in this project to explore the effective ways of solving the paper basis weight distribution uniformity via on-line control. By analyzing the coupling features and time delay phenomenon existed in CD basis weight unit, a multivariable fast fuzzy decoupling strategy and a real-time robust time-delay control algorithm will be proposed. A general method of converting high dimensional multivariable control problem into single loop group control problems by using fuzzy control principle and a new approach to designing analytical robust Smith predictor by minimizing the target function on the weighting sensitivity will be investigated. A novel method of time-space-positioning between CD basis weight data and dilution valves will be proposed and a new approach of acquiring full CD basis weight information will be investigated by wavelet threshold denoising approach and data compressive sensing technique. The mechanism on generating the inverse response of stock consistency dilution and the eliminating measurement will be explored. A set of comprehensive control strategy for CD basis weight based dilution water headbox will be presented. The purpose of this research proposal is to solve the intractable problems brought by such factors as multivariable, strong coupling, long time delay, time-space-malposition, ect, existed in the CD basis weight control unit based on the dilution water headbox, and provide a theoretical reference and technological guidance for the design of advanced CD basis weight control system.