Circumventing Unstable Zero Dynamics in Input-Output Linearization of Longitudinal Flight Dynamics

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Jhon_Longitudinal_Flight_Control_Feedback_Linearization_Scitech_2024.pdf (778.25 KB)

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https://arc.aiaa.org/doi/abs/10.2514/6.2024-0321

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https://doi.org/10.2514/6.2024-0321
 http://hdl.handle.net/11603/31590

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UMBC Mechanical Engineering Department
UMBC Faculty Collection
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Author/Creator ORCID

https://orcid.org/0000-0002-4146-6275

Date

2024-01-04

Type of Work

conference papers and proceedings
preprints
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Citation of Original Publication

Delgado, Jhon M. Portella, and Ankit Goel. “Circumventing Unstable Zero Dynamics in Input-Output Linearization of Longitudinal Flight Dynamics.” In AIAA SCITECH 2024 Forum. American Institute of Aeronautics and Astronautics. Accessed January 25, 2024. https://doi.org/10.2514/6.2024-0321.

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© 2024 American Institute of Aeronautics and Astronautics

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Abstract

In this paper, we consider the problem of input-output linearization of the longitudinal flight dynamics. In longitudinal flight dynamics, inputs are typically thrust and elevator deflection whereas the outputs are the velocity and the flight path angle. An input-output linearization-based controller can be designed to render the multi-input, multi-output system linear; however, the resulting zero dynamics turns out to be unstable. In this work, we remove the zero dynamics from the closed-loop dynamics by considering an additional output. Although the additional output makes the system tall, which, in general, means that the input-to-output dynamics can not be linearized, we show that in the case of longitudinal flight dynamics, linearization is possible due to special geometric properties of the nonlinear terms.