Search International and National Patent Collections

1. (WO2017152259) OPTIMAL CLOSED-LOOP INPUT DESIGN FOR IDENTIFICATION OF FLAT SHEET PROCESS MODELS

Pub. No.:    WO/2017/152259    International Application No.:    PCT/CA2017/000035
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Thu Feb 23 00:59:59 CET 2017
IPC: D21F 7/00
G05B 17/02
Applicants: HONEYWELL LIMITED / HONEYWELL LIMITEE
Inventors: LU, Qiugang
GOPALUNI, Bhusban
FORBES, Michael
BACKSTROM, Johan
DUMONT, Guy
LOEWEN, Philip
Title: OPTIMAL CLOSED-LOOP INPUT DESIGN FOR IDENTIFICATION OF FLAT SHEET PROCESS MODELS
Abstract:
Sheetmaking cross-directional (CD) control requires a sophisticated model-based controller whose operation requires an accurate model of process behavior, but due to the complexity of the process, identifying these process models is challenging. Current techniques rely on open-loop process experimentation. Using non-causal scalar transfer functions for the steady-state CD process model and controller model avoid the problem of large dimensions associated with the CD process. These non-causal transfer functions can be represented by causal transfer functions that are equivalent to the non- causal ones in the sense of the output spectrum. A closed-loop optimal input design framework is proposed based on these causal equivalent models. CD actuators have responses in both sides along the cross direction which can be viewed as a non-causal behavior. Techniques to perform the non-causal modeling are demonstrated and developed in a closed-loop optimal input design framework based on non-causal modeling of the closed-loop CD process.