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Aerospace 2019, 6(2), 24; https://doi.org/10.3390/aerospace6020024

Identification of Aeroelastic Models for the X-56A Longitudinal Dynamics Using Multisine Inputs and Output Error in the Frequency Domain

1
NASA Langley Research Center, Hampton, VA 23681, USA
2
NASA Armstrong Flight Research Center, Edwards, CA 93523, USA
*
Author to whom correspondence should be addressed.
Received: 28 November 2018 / Revised: 1 February 2019 / Accepted: 5 February 2019 / Published: 22 February 2019
(This article belongs to the Special Issue Aeroelasticity)
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Abstract

System identification from measured flight test data was conducted using the X-56A aeroelastic demonstrator to identify a longitudinal flight dynamics model that included the short period, first symmetric wing bending, and first symmetric wing torsion modes. Orthogonal phase-optimized multisines were used to simultaneously excite multiple control effectors while a flight control system was active. Non-dimensional stability and control derivatives parameterizing an aeroelastic model were estimated using the output-error approach to match Fourier transforms of measured output response data. The predictive capability of the identified model was demonstrated using other flight test data with different inputs and at a different flight conditions. Modal characteristics of the identified model were explored and compared with other predictions. Practical aspects of the experiment design and system identification analysis, specific to flexible aircraft, are also discussed. Overall, the approach used was successful for identifying aeroelastic flight dynamics models from flight test data. View Full-Text
Keywords: aeroelasticity; flight dynamics; X-56A; system identification; output error; parameter estimation; frequency domain; multisine inputs aeroelasticity; flight dynamics; X-56A; system identification; output error; parameter estimation; frequency domain; multisine inputs
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Grauer, J.A.; Boucher, M.J. Identification of Aeroelastic Models for the X-56A Longitudinal Dynamics Using Multisine Inputs and Output Error in the Frequency Domain. Aerospace 2019, 6, 24.

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