DocumentCode :
2310428
Title :
LFT representation of a longitudinal perturbed aircraft model by flatness approach
Author :
Cazaurang, Franck ; Lavigne, Loïc ; Bergeon, Benoît
Author_Institution :
LAP, Univ. of Bordeaux I, France
fYear :
2002
fDate :
2002
Firstpage :
230
Lastpage :
235
Abstract :
In this paper, an linear fractional transformations (LFT) model representing, the dynamic of the gap between a nominal model and a perturbed model of a longitudinal aircraft fighter along a trajectory is given. The proposed approach is based on a simplified model used to determine a nominal trajectory and corresponding input. This simplified nonlinear model is a flat nonlinear system. As the measures on the so-called flat outputs, used in the linearizing feedback, are corrupted with noise and effects of unmodelled dynamics or parametric errors (model simplifications), the state space trajectory of the actual plant is not identical to the reference state space trajectory. Then the exact linearization is not achieved, but, as long as the tracking error remains small enough, the actual quasi-linearised plant can be modelled as a disturbed linear plant. The gap behaviour is modelled by a set of linear models described by a LFT model.
Keywords :
feedback; linearisation techniques; military aircraft; noise; state-space methods; transforms; LFT representation; disturbed linear plant; exact linearization; fighter aircraft; flatness approach; gap behaviour; linear fractional transformations; linearizing feedback; longitudinal aircraft fighter; longitudinal perturbed aircraft model; noise; quasi-linearised plant; state space trajectory; Aerodynamics; Automatic control; Engines; Military aircraft; Nonlinear dynamical systems; Nonlinear systems; Open loop systems; Power system modeling; Stability; State-space methods;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computer Aided Control System Design, 2002. Proceedings. 2002 IEEE International Symposium on
Print_ISBN :
0-7803-7388-X
Type :
conf
DOI :
10.1109/CACSD.2002.1036959
Filename :
1036959
Link To Document :
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