CEAS EuroGNC 2024
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Parametric sensitivity analysis for the robust control of uncertain space systems
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| Ervan Kassarian |
DYCSYT, 31400, Toulouse, France. | | Francesco Sanfedino |
ISAE-Supaero, 31400, Toulouse, France. | | Daniel Alazard |
ISAE-Supaero, 31400, Toulouse, France. | | Hélène Evain |
CNES, 31400, Toulouse, France. |
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| Abstract:
Modern modelling, analysis and robust control techniques aim to tackle parametric uncertainties as early as possible in the design of the GNC/AOCS of space systems. However, it is most often necessary to only consider a subset of the uncertain parameters to ensure the tractability of the model, and the choice is generally based on the experience of the engineer. This paper investigates the field of global sensitivity analysis to identify the most influential parameters more systematically, and more generally to improve the reliability and the efficiency of the V&V phase. The selected methods are applied to a simple satellite benchmark to capture the influence of the parameters, including their interaction effects, on the H-infinity norm. It is shown that the Morris and variance-based methods are able to rank the parameters in a complementary way, as the former is computationally cheaper while the latter quantifies the impact of each parameter on the variance of the norm. Finally, it is shown how the results of the sensitivity analysis can support the trade-off between accuracy and computation time when using mu-analysis to estimate the worst-case performance. Sensitivity analysis may also support plant identification and optimization-based methods, such as control/structure co-design, by allowing to make an informed choice on which parameters to prioritize.
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| Keywords: Robust control; sensitivity analysis; space systems |
 View PDF CEAS-GNC-2024-007 |
| Ervan Kassarian, Francesco Sanfedino, Daniel Alazard, Hélène Evain: Parametric sensitivity analysis for the robust control of uncertain space systems. Proceedings of the 2024 CEAS EuroGNC conference. Bristol, UK. June 2024. CEAS-GNC-2024-007.
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| BibTeX entry:
@Incollection{CEAS-GNC-2024-007,
author = {Kassarian, Ervan and Sanfedino, Francesco and Alazard, Daniel and Evain, Hélène},
title = {Parametric sensitivity analysis for the robust control of uncertain space systems},
booktitle = {Proceedings of the 2024 {CEAS EuroGNC} conference},
address = {Bristol, UK},
month = jun,
year = {2024},
note = {CEAS-GNC-2024-007}
}
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