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Advances in Aircraft and Spacecraft Science
  Volume 8, Number 4, July 2021 , pages 273-287

Physics-based modelling for a closed form solution for flow angle estimation
Angelo Lerro

    Model-based, data-driven and physics-based approaches represent the state-of-the-art techniques to estimate the aircraft flow angles, angle-of-attack and angle-of-sideslip, in avionics. Thanks to sensor fusion techniques, a synthetic sensor is able to provide estimation of flow angles without any dedicated physical sensors. The work deals with a physics-based scheme derived from flight mechanic theory that leads to a nonlinear flow angle model. Even though several solvers can be adopted, nonlinear models can be replaced with less accurate but straightforward ones in practical applications. The present work proposes a linearisation to obtain the flow angles' closed form solution that is verified using a flight simulator. The main objective of the paper, in fact, is to analyse the estimation degradation using the proposed closed form solutions with respect to the nonlinear scheme. Moreover, flight conditions, where the proposed closed form solutions are not applicable, are identified.
Key Words
    flow angles; flight mechanics; model-free
Angelo Lerro: Department of Mechanical and Aerospace Engineering, Polytechnic University of Turin, Duca degli Abruzzi 24 Turin, 10129, Italy

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