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Robust scheduled control of longitudinal flight with handling quality satisfaction

Published online by Cambridge University Press:  27 January 2016

D. Saussié ,
C. Bérard ,
O. Akhrif  and
L. Saydy
D. Saussié*
Affiliation:
Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Canada
C. Bérard
Affiliation:
Department of Mathematics, Computer Science and Control Theory, ISAE, Toulouse, France
O. Akhrif
Affiliation:
Department of Electrical Engineering, École de Technologie Supérieure, Montréal, Canada
L. Saydy
Affiliation:
Department of Electrical Engineering, École Polytechnique de Montréal, Montréal, Canada
*
david.saussie@polymtl.ca
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Abstract

Classic flight control systems are still widely used in the industry because of acquired experience and good understanding of their structure. Nevertheless, with more stringent constraints, it becomes difficult to easily fulfil all the criteria with these classic control laws. On the other hand, modern methods can handle many constraints but fail to produce low order controllers. The following methodology proposed in this paper addresses both classic and modern flight control issues, to offer a solution that leverages the strengths of both approaches. First, an H∞ synthesis is performed in order to get controllers which satisfy handling qualities and are robust with respect to mass and centre of gravity variations. These controllers are then reduced and structured by using robust modal control techniques. In conclusion, a self-scheduling technique is described that will schedule these controllers over the entire flight envelope.

Type
Research Article
Information
The Aeronautical Journal , Volume 115 , Issue 1165 , March 2011 , pp. 163 - 174
Copyright
Copyright © Royal Aeronautical Society 2011 

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