Trajectory optimisation of six degree of freedom aircraft using differential flatness

The flatness of a six-degree-of-freedom (6DoF) aircraft model with conventional control surfaces – aileron, flap, rudder and elevator, along with thrust vectoring ability is established in this work. Trajectory optimisation of an aircraft can be cast as an inverse problem where the solution for cont...

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Bibliographic Details
Published in:Aeronautical journal 2018-11, Vol.122 (1257), p.1788-1810
Main Authors: Elango, P., Mohan, R.
Format: Article
Language:English
Subjects:
Aerospace engineering
Aircraft
Aircraft control
Aircraft models
Aviation
Collocation
Computing time
Control surfaces
Control theory
Degrees of freedom
Equivalence
Flatness
Inverse problems
Laboratories
Thrust vector control
Trajectory optimization
Unmanned aerial vehicles
Vehicles
Velocity
Viability
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Summary:The flatness of a six-degree-of-freedom (6DoF) aircraft model with conventional control surfaces – aileron, flap, rudder and elevator, along with thrust vectoring ability is established in this work. Trajectory optimisation of an aircraft can be cast as an inverse problem where the solution for control inputs that yield desired trajectories for certain states is sought. The solution to the inverse problems for certain systems is made tractable when they exhibit differential flatness. Flatness-based trajectory optimisation has a significant advantage over an equivalent collocation-based method in terms of computational efficiency and viability for real-time implementation. An application for the flatness of 6DoF aircraft is shown in the trajectory optimisation for dynamic soaring, and its connection with an equivalent 3DoF flatness-based implementation is also brought out. The results are compared with that from a collocation-based approach.
ISSN:0001-9240
2059-6464
DOI:10.1017/aer.2018.99