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Integrated modelling of microvibrations induced by Solar Array Drive Mechanism for worst-case end-to-end analysis and robust disturbance estimation

Abstract : Modern and future observation Space missions face increasingly more demanding pointing performance requirements. This is accompanied with the development of larger lightweight flexible structures. This paper outlines a methodology for modeling a generic multi-body flexible spacecraft in an end-to-end fashion within the Two-Inputs Two-Outputs Port framework: from disturbance all the way to pointing performance by taking into account all the uncertainties of each sub-system. A particular focus is dedicated to a novel generic model for Solar Array Drive Mechanism and its harmonic disturbances produced by the micro-stepping driver and the gearbox imperfections. The proposed model is validated with the on-board telemetries of a European spacecraft. Moreover this paper shows how the proposed model-based approach can be easily used for control design and closed-loop robust performance analysis. Worst-case scenarios of mechanical parameters combination are investigated to provide robust performance certificate of the reference study case. A Linear Parameter-Varying observer, scheduled by the solar array rotor angle, is finally proposed in order to estimate the disturbance torques induced by the gearbox imperfections just using the measurements coming from a classical attitude control system: a star tracker and a gyrometer.
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https://hal.archives-ouvertes.fr/hal-03273839
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Submitted on : Tuesday, June 29, 2021 - 3:39:07 PM
Last modification on : Tuesday, June 29, 2021 - 3:58:25 PM
Long-term archiving on: : Thursday, September 30, 2021 - 7:08:08 PM

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Francesco Sanfedino, Daniel Alazard, Valentin Preda, Davide Oddenino. Integrated modelling of microvibrations induced by Solar Array Drive Mechanism for worst-case end-to-end analysis and robust disturbance estimation. Mechanical Systems and Signal Processing, Elsevier, 2022, 163, pp.108168. ⟨10.1016/j.ymssp.2021.108168⟩. ⟨hal-03273839⟩

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