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Design of Robust Autoland Control Laws using mu-Synthesis

Looye, G. and Sancho, C.E.S. and Makdoembaks, A.A. and Mulder, J.A. (2002) Design of Robust Autoland Control Laws using mu-Synthesis. Proc. of AIAA Guidance, Navigation & Control Conference and Exhibit, 2002-08-05 - 2002-08-08, Monterey, CA.

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Abstract

The design of autoland control laws for a large civil transport aircraft using mu-synthesis is discussed. The controller architecture consists of functions for tracking the ILS-approach path, and for flare and alignment of the aircraft shortly before touchdown. For each function, design requirements are formulated using weighting functions in the frequency domain. Model uncertainty is incorporated via automatically generated Linear Fraction Parametric Uncertainty Models (LF-PUMs). The structured singular value, as the measure for robust performance, is then optimized via so-called D-K iteration. Robustness of the resulting controller functions is assessed via mu-analysis and batch simulations. Monte Carlo analysis is used to test autoland performance under varying environment and disturbance parameters. As an ultimate robustness test, this analysis is performed with the nominal, as well as worst-case aircraft model configurations. The reason for this is, that in practice the Monte Carlo aircraft model may be more detailed and accurate than the model available during the design, frequently requiring late additional design iterations.

Document Type:Conference or Workshop Item (Paper)
Additional Information:LIDO-Berichtsjahr=2003,
Title:Design of Robust Autoland Control Laws using mu-Synthesis
Authors:
AuthorsInstitution or Email of Authors
Looye, G.UNSPECIFIED
Sancho, C.E.S.Delft University of Technology
Makdoembaks, A.A.Delft University of Technology
Mulder, J.A.UNSPECIFIED
Date:2002
Status:Published
Keywords:AUTOMATIC LANDING CONTROL, INSTRUMENT LANDING SYSTEMS, ROBUST CONTROL, MU-SYNTHESIS, CONTROL SYSTEMS DESIGN, AIRCRAFT CONTROL, CONTROL THEORY, TRANSPORT AIRCRAFT, PARAMETER UNCERTAINTY, MATHEMATICAL MODELS,
Event Title:Proc. of AIAA Guidance, Navigation & Control Conference and Exhibit
Event Location:Monterey, CA
Event Type:international Conference
Event Dates:2002-08-05 - 2002-08-08
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flexible Aircraft (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:12 Dec 2013 20:02

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