Authors:
Isaac Yaesh
1
and
Uri Shaked
2
Affiliations:
1
IMI, Israel
;
2
Tel-Aviv University, Israel
Keyword(s):
H_infinity Optimization, Flight Control, Flexible Aircraft, Pole Placement.
Related
Ontology
Subjects/Areas/Topics:
Engineering Applications
;
Informatics in Control, Automation and Robotics
;
Intelligent Control Systems and Optimization
;
Real-Time Systems Control
;
Robotics and Automation
;
Signal Processing, Sensors, Systems Modeling and Control
Abstract:
A non-smooth optimization approach is considered for designing constant output-feedback controllers for
linear time-invariant systems with lightly damped poles. The design requirements combine H_infinity performance
requirements with regional pole constraints excluding high frequency lightly damped poles. In contrast to the
usual (full) pole-placement (FPP) problem, the problem dealt here is one of Selective Pole Placement (SPP).
The latter design problem is frequently encountered in the control of aircraft with non-negligible aeroelastic
modes which are too fast to be handled by the control surface actuators. As in the FPP case, the pole constraints
are embedded in the design criterion using a transformation on the system model which modifies the H_infinity norm
of the closed-loop system via a barrier function that is related to the closed-loop poles damping. Dissimilar to
the closed-loop solution that is designed for the FPP, in the SPP case, numerical calculations of the gradient
of
the cost function is needed. The proposed method is applied to a flight control example of a flexible aircraft.
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