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Delft University of TechnologyFaculty of Aerospace Engineering
FF--35 Reconfigurable Flight Control35 Reconfigurable Flight ControlControl & Simulation Division in collaboration with NLR
Project DescriptionProject Description Integrated Adaptive ControlIntegrated Adaptive Control
Flight Envelope ProtectionFlight Envelope Protection
Modern fighter aircraft such as the FModern fighter aircraft such as the F--35 Lightning II, 35 Lightning II,
formerly known as JSF, are inherently unstable, highly formerly known as JSF, are inherently unstable, highly
nonlinear systems that rely on automatic flight control nonlinear systems that rely on automatic flight control
systems to augment stability such that the pilot can systems to augment stability such that the pilot can
benefit from its agility and high maneuverability. In benefit from its agility and high maneuverability. In
addition to this, tolerance to structural damage and/or addition to this, tolerance to structural damage and/or
actuator failures is a desired feature of modern flight actuator failures is a desired feature of modern flight
control systems. control systems.
In recent years, these drivers have led to a In recent years, these drivers have led to a
considerable amount of research into the new field of considerable amount of research into the new field of
reconfigurable flight control in both academia and reconfigurable flight control in both academia and
industry. However, the Findustry. However, the F--35 will only be equipped with 35 will only be equipped with
a nonlinear dynamic inversion controller which relies a nonlinear dynamic inversion controller which relies
on a precise onboard dynamic aircraft model. Within on a precise onboard dynamic aircraft model. Within
the available computing power an adaptive control law the available computing power an adaptive control law
with onwith on--line model identification can be designed to line model identification can be designed to
improve safety in operations and survivability.improve safety in operations and survivability.
Modular Adaptive ControlModular Adaptive Control
The aim of this project is to develop two concept onThe aim of this project is to develop two concept on--
line reconfigurable flight control systems for the Fline reconfigurable flight control systems for the F--35 35
based on a modular and an integrated adaptive control based on a modular and an integrated adaptive control
approach, both of which will be based on the latest approach, both of which will be based on the latest
nonlinear control, dynamic model identification and nonlinear control, dynamic model identification and
control allocation methods.control allocation methods.
Dr. Q. P. Chu Dr. Q. P. Chu [email protected]@tudelft.nl
Ir. J. H. Ir. J. H. BreemanBreeman [email protected]@nlr.nl
Prof. Dr. Ir. J. A. Mulder Prof. Dr. Ir. J. A. Mulder [email protected]@tudelft.nl
Ir. E. R. van OortIr. E. R. van Oort [email protected]@tudelft.nl
Ir. L. SonneveldtIr. L. Sonneveldt [email protected]@tudelft.nl
ContactsContacts
Verification & EvaluationVerification & Evaluation
OnOn--line identified model is verified using flight test line identified model is verified using flight test
data obtained from the Fdata obtained from the F--16 test aircraft 16 test aircraft ““Orange Orange
JumperJumper””. Flight Control systems are evaluated by test . Flight Control systems are evaluated by test
pilots in moving base simulator SIMONA.pilots in moving base simulator SIMONA.
Advanced flight control systems of commercial and Advanced flight control systems of commercial and
military aircraft nowadays have measures to prevent military aircraft nowadays have measures to prevent
the pilot from entering statethe pilot from entering state-- and control regions and control regions
outside the safe flight regime of the aircraft. outside the safe flight regime of the aircraft.
When a failure occurs a new safe flight regime will When a failure occurs a new safe flight regime will
have to be determined from the online identified have to be determined from the online identified
model. Furthermore, the best achievable pilot model. Furthermore, the best achievable pilot
handling qualities will have to be maintained.handling qualities will have to be maintained.
FF--16 16 ““Orange JumperOrange Jumper”” SIMONA at the C&S DivisionSIMONA at the C&S Division
With this approach the parameter estimation process With this approach the parameter estimation process
is done with neural networks inside the parameter is done with neural networks inside the parameter
update laws of the controller itself. Such an integrated update laws of the controller itself. Such an integrated
scheme became possible with the introduction of the scheme became possible with the introduction of the
adaptive backstepping technique in the mid 90's.adaptive backstepping technique in the mid 90's.
The modular approach separates the identifier and The modular approach separates the identifier and
control law design. The total flightcontrol law design. The total flight--envelope is envelope is
partitioned using hyperboxes, for each hyperbox a partitioned using hyperboxes, for each hyperbox a
local model is estimated using the Two Step Method. local model is estimated using the Two Step Method.
The control law is designed to be robust against The control law is designed to be robust against
parameter estimation errors and estimation parameter estimation errors and estimation
transients.transients.
