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An Unusual Structure for a Feedforward Gust Load Alleviation Controller

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Advances in Aerospace Guidance, Navigation and Control

Abstract

This paper presents an unusual feedforward controller structure that allows to take allocation constraints into account which can be expressed in the time-frequency or time-scale domains. This novel controller structure was motivated by the design of a feedforward controller for airplane gust and turbulence load alleviation based on Doppler LIDAR measurements. As shown by the application that has motivated this development, some strongly nonlinear constraints can be guaranteed by the design of the structure. The developed structure is not restricted to the considered application and could be applied successfully to many other feedforward control problems with some prior knowledge of the upcoming disturbances or references.

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Notes

  1. 1.

    Note that indirectly, after having exploited the structure proposed hereafter, the advanced tools provided by the linear control theory could actually be applied to each of the resulting subproblems.

  2. 2.

    The low amplitudes are removed here because it is expected that they essentially resulted from the sensor noise via the wind reconstruction algorithm: considering them and taking actions based on them is likely to not provide any load improvement. It would even generate load cycles in the structure while flying through calm air.

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Acknowledgements

The author thanks the European CleanSky initiative for the partial funding of this work (under grant CSJU-GAM-SFWA-2008-01) as well as the project partners involved in the SFWA WP1.2 and especially Airbus, which provided the flexible long range aircraft model data (XRF1 model), and the colleagues Thiemo Kier and Hans-Dieter Joos from DLR Institute of System Dynamics and Control, who prepared the integrated model and provided the corresponding simulation environment and basis controller (both EFCS and FBALC).

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Authors and Affiliations

  1. DLR, Institute of Flight Systems, Lilienthalplatz 7, 38108, Braunschweig, Germany

    Nicolas Fezans

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  1. Nicolas Fezans
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Correspondence to Nicolas Fezans .

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Editors and Affiliations

  1. Avionics and Control Systems Department, Rzeszów University of Technology, Rzeszów, Poland

    Bogusław Dołęga

  2. The Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, Warsaw, Poland

    Robert Głębocki

  3. Avionics and Control Systems Department, Rzeszów University of Technology, Rzeszów, Poland

    Damian Kordos

  4. The Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, Warsaw, Poland

    Marcin Żugaj

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Fezans, N. (2018). An Unusual Structure for a Feedforward Gust Load Alleviation Controller. In: Dołęga, B., Głębocki, R., Kordos, D., Żugaj, M. (eds) Advances in Aerospace Guidance, Navigation and Control. Springer, Cham. https://doi.org/10.1007/978-3-319-65283-2_3

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  • DOI: https://doi.org/10.1007/978-3-319-65283-2_3

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-65282-5

  • Online ISBN: 978-3-319-65283-2

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