LPV Control for Multi-harmonic Microvibration Attenuation: Application to High Stability Space Missions

Robust microvibration mitigation and pointing performance analysis for high stability spacecraft

“…The goal, which is to establish stability and performance, bounds to drive the closed-loop system to the limits of achievable performance. This paper builds upon the previous work reported in other works [16][17][18][19][20] and introduces the following key contributions in modeling, performance specification, robust controller synthesis, and performance analysis:…”

“…The proposed microvibrations strategy is based on the previous work reported in other works. [16][17][18][19][20] The isolation architecture relies on passive elastomer isolators to mitigate high-frequency harmonics while a complementary active control strategy targets the low-frequency perturbations. The model of isolation setup is afterwards integrated with the simplified structural model of a flexible spacecraft driven by a reaction wheel.…”

“…However, due to its nonconvex character, can be difficult to compute exactly, and in order to include these criteria into the control design procedures, is replaced with a more conservative upper bound. In this case, the closed-loop system (19) is guaranteed to remain stable for any fixed spin rate Ω ∈ and ∀Δ ∈ ,…”

“…The goal, which is to establish stability and performance, bounds to drive the closed‐loop system to the limits of achievable performance. This paper builds upon the previous work reported in other works and introduces the following key contributions in modeling, performance specification, robust controller synthesis, and performance analysis: a new disturbance model that is suitable for synthesis/analysis for the perturbations produced by a reaction wheel spinning at a particular rate; the uncertain and parameter varying model that is derived in this paper contains the dynamics of the satellite with its flexible attachment, the ACS, the microvibration mitigation unit including the reaction wheel. The resulting end‐to‐end model considers the coupling between all these various subcomponents; the control objectives are defined both in terms of pointing performance of the optical instrument and are guaranteed for the particular mission profile; a procedure is introduced to synthesize a low‐order robust linear parameter varying (LPV) controller for different levels of system uncertainty and the closed loop is afterwards analyzed for time‐varying parameters, saturations and time‐varying delays using μ and IQC analysis. …”

“…In line with these goals, the aim of this paper is to design a microvibration mitigation system for generic observation satellites equipped by flexible appendages, reaction wheels and an ACS, with the main objective to improve the pointing performance of the optical instrument, the final goal being the improvement of the image quality. The proposed microvibrations strategy is based on the previous work reported in other works . The isolation architecture relies on passive elastomer isolators to mitigate high‐frequency harmonics while a complementary active control strategy targets the low‐frequency perturbations.…”