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Advanced Uncertainty Modeling and Robustness Analysis for the Basic Flight Control System of a Modern Jet Trainer

Herrnberger, M. and Heller, M. and Paul, R. and Hecker, Simon and Sachs, G. (2007) Advanced Uncertainty Modeling and Robustness Analysis for the Basic Flight Control System of a Modern Jet Trainer. In: Proceedings of AIAA Guidance, Navigation and Control Conference. AIAA 2007, South Carolina, USA.

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Abstract

[Abstract] Due to the continuously increasing design requirements on modern aircraft the robustness properties of their flight control systems against multiple model uncertainty becomes a more and more important issue for flight control system certification and flight clearance, particulary in the case of an unstabel aerodynamic basic design. Most classical approches (like stability margins in the Nichols Chart) only provide incomplete information about the qualitative and quantitative degree of robustness. Therefore, an innovative approach for robustness analysis of the primary control laws of a modern jet trainer will be presented here which uses the structured singular value (SSV) and a physically motivated parametric uncertainty model. The methodology is applied to both the longitudinal and lateral basic controller and shows a direct and exact way from the definition of parametric uncertainties to an uncertain system model suitable for -analysis. Particularly, the introduction of a trim point uncertainty emphasizes the davanced character of this analysis method by incorporating the dependence of the control loop parameters (plant and controller gains) on the current trim point into the uncertainty model. Consequently the analysis of the controller can be accomplished for entire regions of the flight envelope in a single robustness test. Therefore, the proposed approach demonstrates the possibility of substituting the conventional proceedures for proving controller robustness by a more efficient methodology.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Advanced Uncertainty Modeling and Robustness Analysis for the Basic Flight Control System of a Modern Jet Trainer
Authors:
AuthorsInstitution or Email of Authors
Herrnberger, M.Technische Universität München, Munich, Germany
Heller, M.EADS Military Air Systems, Munich, Germany
Paul, R.EADS Military Air Systems, Munich, Germany
Hecker, SimonUNSPECIFIED
Sachs, G.Technische Universität München, Munich, Germany
Date:2007
Journal or Publication Title:Proceedings of AIAA Guidance, Navigation and Control Conference
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:-
Event Title:AIAA 2007
Event Location:South Carolina, USA
Event Type:international Conference
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 - Systems & Cabin
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics > System Dynamics and Control (former Control Design Engineering)
Deposited By: Monika Klauer
Deposited On:12 Sep 2007
Last Modified:12 Dec 2013 20:27

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