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Trajectory optimisation of six degree of freedom aircraft using differential flatness

Published online by Cambridge University Press:  15 November 2018

P. Elango  and
R. Mohan
P. Elango*
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai, India
R. Mohan
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai, India
*
*purnanandelango@gmail.com
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Abstract

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.

Keywords

Differential flatnessTrajectory optimisation6DoF aircraftDynamic soaring
Type
Research Article
Information
The Aeronautical Journal , Volume 122 , Issue 1257 , November 2018 , pp. 1788 - 1810
Copyright
© Royal Aeronautical Society 2018 

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