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Flight control law clearance using optimization-based worst-case search

Joos, Hans-Dieter (2009) Flight control law clearance using optimization-based worst-case search. 6th IFAC Symposium on Robust Control Design, 16.-18. Juni 2009, Haifa, Israel.

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Abstract

The flight control law clearance problem can be formulated as a robustness analysis problem, where a set of suitably defined clearance criteria must be checked to lie within certain limits for all admissible variations of aircraft parameters, pilot inputs and all flight conditions. The idea of optimisation based worst case clearance is to use available and efficient optimisation methods to find those parameters/inputs/flight conditions for which the criteria are violated or poorly satisfied. The potentials of this approach are its general usability for both frequency-domain and time-domain analysis, and for both linear and non-linear models and control laws including protections. Moreover, there is no limitation on the number of parametric uncertainties that can be investigated and the method does not itself add conservatism to the clearance problem as many other alternatives do, mainly those based on approximations or simplifications. The most challenging problem with the optimisation based approach is not to find hidden weaknesses if they exist, but to confidently assert that no weakness exists for all parameters/inputs/flight conditions. To assert this a global optimum solution has to be found usually resulting in a huge amount of computational work. For highly nonlinear clearance problems regarding manoeuvrability in the peripheral flight envelope of a civil transportation aircraft the suitability of the optimisation based approach is demonstrated. Different global optimisation algorithms and strategies are investigated with respect to its reliability in finding worst cases, computational efficiency and its potential for distributed computation in order to reduce time to clearance.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Flight control law clearance using optimization-based worst-case search
Authors:
AuthorsInstitution or Email of Authors
Joos, Hans-DieterDieter.Joos@DLR.de
Date:2009
Status:Published
Keywords:flight control
Event Title:6th IFAC Symposium on Robust Control Design
Event Location:Haifa, Israel
Event Type:international Conference
Event Dates:16.-18. Juni 2009
Organizer:IFAC
HGF - Research field:Aeronautics, Space and Transport (old)
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:13 Jan 2010 15:24
Last Modified:15 Jan 2010 02:37

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