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Estimation of aerodynamic parameters near stall using maximum likelihood and extreme learning machine-based methods

Published online by Cambridge University Press:  23 October 2020

H.O. Verma Open the ORCID record for H.O. Verma [Opens in a new window]  and
N.K. Peyada
H.O. Verma*
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, India
N.K. Peyada*
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, India
*
homverma@gmail.com, homverma@aero.iitkgp.ac.in
nkpeyada@aero.iitkgp.ac.in
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Abstract

The stability and control derivatives are essential parameters in the flight operation of aircraft, and their determination is a routine task using classical parameter estimation methods based on maximum likelihood and least-squares principles. At high angle-of-attack, the unsteady aerodynamics may pose difficulty in aerodynamic structure determination, hence data-driven methods based on artificial neural networks could be an alternative choice for building models to characterise the behaviour of the system based on the measured motion and control variables. This research paper investigates the feasibility of using a recurrent neural model based on an extreme learning machine network in the modelling of the aircraft dynamics in a restricted sense for identification of the aerodynamic parameters. The recurrent extreme learning machine network is combined with the Gauss–Newton method to optimise the unknowns of the postulated aerodynamic model. The efficacy of the proposed estimation algorithm is studied using real flight data from a quasi-steady stall manoeuvre. Furthermore, the estimates are validated against the parameters estimated using the maximum likelihood method. The standard deviations of the estimates demonstrate the effectiveness of the proposed algorithm. Finally, the quantities regenerated using the estimates present good agreement with their corresponding measured values, confirming that a qualitative estimation can be obtained using the proposed estimation algorithm.

Keywords

Recurrent Neural ModelExtreme Learning MachineParameter EstimationMaximum Likelihood EstimationGauss–Newton MethodQuasi-Steady Stall ManoeuvreAerodynamic Model
Type
Research Article
Information
The Aeronautical Journal , Volume 125 , Issue 1285 , March 2021 , pp. 489 - 509
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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