Journal of Control Science and Engineering 
Volume 2008 (2008), Article ID 289391, 6 pages
doi:10.1155/2008/289391
Research Article

Robust Design of Terminal ILC with H∞ Mixed Sensitivity Approach for a Thermoforming Oven

Guy Gauthier1 and Benoit Boulet2

 1Automated Production Department, École de Technologie Supérieure, Université du Québec, Montréal, QC, H3C 1K3, Canada
2Department of Electrical and Computer Engineering, McGill University, Montréal, QC, H3A 2A7, Canada
Received 9 November 2007; Accepted 2 May 2008

Recommended by Kevin Moore

Abstract

This paper presents a robust design approach for terminal iterative learning control (TILC). This robust design uses the H∞ mixed-sensitivity technique. An industrial application is described where TILC is used to control the reheat phase of plastic sheets in a thermoforming oven. The TILC adjusts the heater temperature setpoints such that, at the end of the reheat cycle, the surface temperature map of the plastic sheet will converge to the desired one. Simulation results are included to show the effectiveness of the control law.