Symbolic Techniques for Low Order LFT-Modelling

Authors:	Hecker Simon, DLR - German Aerospace Center, Germany Varga Andras, DLR - German Aerospace Center, Germany
Topic:	2.5 Robust Control
Session:	Parametric Robustness
Keywords:	Robust Control, Linear Fractional Transformation (LFT), Parametric Uncertain Systems

Abstract

Symbolic preprocessing techniques are very useful to obtain low order LFT-representations for parametric models. In this paper we give an overview about existing preprocessing methods and we present new techniques and enhancements of existing methods. All methods are implemented in the new version 2 of the LFR-toolbox and their capabilities are illustrated by a challenging aircraft parametric uncertainty modellingexample.