Robust control design using H-infinity methods in large scale web handling systems
Abstract
This paper presents H-infinity control strategies for elastic web transport systems. The aim is to reduce the coupling between web tension and web transport velocity. First of all, a multivariable H., centralized controller with or without gain scheduling is synthesized for a 3-motor plant composed of an unwinder, a tractor and a winder. This controller is then compared to a semi-decentralized weighted controller with overlapping. The influence of the weighting coefficients is shown on simulation results obtained from a non-linear model identified on an experimental bench. Web handling systems are generally of large scale and it is not possible to synthesize a centralized controller for such scale. Therefore the global system is split in several subsystems (we have chosen 3-motor subsystems), each subsystem is controlled independently by its own H-infinity controller. The subsystems can be overlapped or not. Simulation results are given on a non-linear 9-motor model.
Citation
Knittel, D. (2003, June). Robust control design using H-infinity methods in large scale web handling systems. Paper presented at the Seventh International Conference on Web Handling (IWEB), Stillwater, OK.