Clearance of Flight Control Laws using Linear Fractional Transformations

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.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Reglerteknik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Control Engineering hsv//eng
Linear fractional tranformation
LFT
Structured singular value
SSV
Linear matrix inequality
LMI
Lyapunov function
Flight clearance
Stability margin
TECHNOLOGY
TEKNIKVETENSKAP

Hansson, JörgenSaab AB, Sweden (author)
Karlsson, FredrikSaab AB, Sweden (author)
Hansson, AndersLinköpings universitet,Reglerteknik,Tekniska högskolan(Swepub:liu)andha17 (author)
Wallin, Ragnar,1962-Linköpings universitet,Reglerteknik,Tekniska högskolan(Swepub:liu)ragwa15 (author)
Saab AB, SwedenReglerteknik (creator_code:org_t)

In:Proceedings of the 2004 AIAA Guidance, Navigation and Control Conference and ExhibitReston, Virigina : American Institute of Aeronautics and Astronautics9781624100734

By the author/editor: Ståhl Gunnarsson ...; Hansson, Jörgen; Karlsson, Fredri ...; Hansson, Anders; Wallin, Ragnar, ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Control Engineer ...

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