Towards a Future Industrial Standard for Cross Direction Control Mapping - Past and Current Practice

摘要

1. What is CD control? 1.1 Cross-machine Directional control of paper quality 1.2 Examples: weight, moisture, caliper, FO, etc. 1.3 Multiple-variable control 1.3.1 Many different control actuators (headbox, steambox, rewet, induction, etc.) 1.3.2 More than thousand of measurement points/profile 1.4 Model based predictive control 2. CD Control Model 2.1 CD actuator to CD measurement mapping 2.2 CD actuator response shape 2.3 CD response dynamics (delay, gain and time constant) 3. CD Mapping 3.1 "Most important for control stability" 3.2 Narrower actuator spacing requires more accurate mapping 3.3 Highly influenced by sheet shrinkage, uncertainty! 3.4 Many different ways to formulate CD mapping today, confusing!