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Robustness Analysis Applied to Autopilot Design, Part 1: mu-Analysis of Design Entries to a Robust Flight Control Benchmark

Looye, G. and Varga, A. and Bennani, S. and Moormann, D. and Grübel, G. (1998) Robustness Analysis Applied to Autopilot Design, Part 1: mu-Analysis of Design Entries to a Robust Flight Control Benchmark. In: Proc. of 21st Congress of the International Council of Aeronautical Sciences. 21st Congress of the International Council of Aeronautical Sciences, 1998-09-13 - 1998-09-18, Melbourne, AUS.

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Abstract

mu-Analysis is a powerful tool for the assessment of the stability of uncertain parametric systems by means of the Structured Singular Value µ. The peak upper bound value of µ over a frequency range provides information on the stability margin of a system for given variations of uncertain parameters, while the computed lower bound on µ allows to obtain worst-case parameter combinations destabilizing the system. The applicability of µ-analysis is however conditioned by the availability of adequate uncertainty models based on Linear Fractional Transformations (LFTs). For complex systems, like aircraft models, LFT modeling is a very demanding and time-consuming task. In this paper we present the generation of an LFT-based uncertainty model for a civil aircraft, starting from a nonlinear dynamic model with explicit parametric dependencies. This nonlinear model was the basis for the design of twelve different flight controllers according to identical specifications. We applied µ-analysis for stability robustness assessment of the twelve control configurations to uncertainties in the aircraft mass, the center of gravity location, and the on-line computational time delay. We determined the corresponding stability margins and the worst-case destabilizing parameter combinations. We used nonlinear simulations to validate our results.

Item URL in elib:https://elib.dlr.de/3454/
Document Type:Conference or Workshop Item (Paper)
Additional Information:LIDO-Berichtsjahr=1999,
Title:Robustness Analysis Applied to Autopilot Design, Part 1: mu-Analysis of Design Entries to a Robust Flight Control Benchmark
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Looye, G.UNSPECIFIEDUNSPECIFIED
Varga, A.UNSPECIFIEDUNSPECIFIED
Bennani, S.Delft University of TechnologyUNSPECIFIED
Moormann, D.UNSPECIFIEDUNSPECIFIED
Grübel, G.UNSPECIFIEDUNSPECIFIED
Date:1998
Journal or Publication Title:Proc. of 21st Congress of the International Council of Aeronautical Sciences
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:mu-Analysis, Structured Singular Value, Robust Control, Flight Control
Event Title:21st Congress of the International Council of Aeronautical Sciences
Event Location:Melbourne, AUS
Event Type:international Conference
Event Dates:1998-09-13 - 1998-09-18
Organizer:ICAS-98-1.6.3
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems & Cabin (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics (until 2012) > Institut für Robotik und Systemdynamik
Deposited By: DLR-Beauftragter, elib
Deposited On:01 Oct 2007
Last Modified:31 Jul 2019 19:14

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