Activity: Talk or presentation types › Public talk, debate, discussion
Linear Fractional Transformations (LFT) and the Structured Singular Value (SSV or mu) are respectively the modelling and analysis cornerstones of the so-called modern robust methods. Essentially, an LFT allows to separate the known linear part of a system from its uncertain component, while mu allows analyzing the uncertain system’s stability and performance. The apparent simplicity of LFTs and the ease with which they can be generated nowadays have resulted sometimes in negative judgement within the community about their usefulness. Nonetheless, these techniques can address very difficult analysis issues for complex systems and from an industrial perspective have successfully been used to validate the control systems of the European Automated Transfer Vehicle (ATV) and the ROSETTA mission among other aerospace systems. The talk will present a brief mathematical introduction to LFT and mu providing the basic understanding, followed by a detailed presentation of the process and results for the analysis of flutter phenomena for flexible aircraft.