Clearance of Flight Control Laws using Linear Fractional Transformations
2004 (English)In: Proceedings of the 2004 AIAA Guidance, Navigation and Control Conference and Exhibit, 2004Conference paper (Refereed)
The problem of flight clearance of linear stability requirements in the complete flight evelope is studied. The approach is to use mu-analysis of linear fractional transformations description of the system dynamics augmented with an uncertainty model of the clearance criteria. Two methods to derive the linear fractional transformations are used and compared: the Trends and Bands method and rational approximations. The two approaches are applied to a UAV demostrator model. The resulting models are analyzed by mu-sensitivites in order to demonstrate how this can be used to reduce the order of the linear fractional transformations description. A number of algorithms to compute upper and lower bounds on mu are also compared. Results from applying the clearance criteria to the UAV demonstrator model are given.
Place, publisher, year, edition, pages
Linear fractional tranformation, LFT, Structured singular value, SSV, Linear matrix inequality, LMI, Lyapunov function, Flight clearance, Stability margin
National CategoryEngineering and Technology Control Engineering
IdentifiersURN: urn:nbn:se:liu:diva-24076DOI: 10.2514/6.2004-4867Local ID: 3638ISBN: 978-1-62410-073-4OAI: oai:DiVA.org:liu-24076DiVA: diva2:244392
2004 AIAA Guidance, Navigation and Control Conference and Exhibit, Providence, RI, USA, August, 2004