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CEAS EuroGNC 2019

A Multi-Channel H Preview Control Approach to Load Alleviation Function Design

Ahmed Khalil DLR (German Aerospace Center), Institute of Flight Systems, Braunschweig, Germany
Nicolas Fezans DLR (German Aerospace Center), Institute of Flight Systems, Braunschweig, Germany
Abstract:
Gust load alleviation functions are mainly designed for two objectives: first, alleviating the structural loads resulting from turbulence or gust encounter, and hence reducing the structural fatigue and/or reducing the structural weight; and second, enhancing the ride qualities, and hence the passengers' comfort. Whilst load alleviation functions can improve both aspects, the designer will still need to make design tradeoffs between these two objectives and between various types and locations of the structural loads. The possible emergence of affordable and reliable remote wind sensor techniques (e.g. Doppler LIDAR) in the future also leads to consider new types of load alleviation functions as these sensors would permit to anticipate the near future gusts and other types of turbulence. In this paper, we propose a preview control design methodology for the design of a load alleviation function with such anticipation capabilities based on recent advancements on discrete-time reduced-order multi-channel H-infinity techniques. The methodology is illustrated on the DLR Discus-2c flexible sailplane model.
Keywords: Aircraft flight control analysis and design; Optimal control; Robust control
View PDFCEAS-GNC-2019-019


Ahmed Khalil, Nicolas Fezans: A Multi-Channel H Preview Control Approach to Load Alleviation Function Design. Proceedings of the 2019 CEAS EuroGNC conference. Milan, Italy. April 2019. CEAS-GNC-2019-019.
BibTeX entry:

@Incollection{CEAS-GNC-2019-019,
    authors = {Khalil, Ahmed and Fezans, Nicolas},
    title = {A Multi-Channel $H_\infty$ Preview Control Approach to Load Alleviation Function Design},
    booktitle = {Proceedings of the 2019 {CEAS EuroGNC} conference},
    address = {Milan, Italy},
    month = apr,
    year = {2019},
    note = {CEAS-GNC-2019-019}
}