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• W2076554429 abstract "Very Large Space Structures (VLSS) are challenging systems to be controlled, due to their high flexibility. In particular, rapid attitude maneuvers can determine great oscillations on the flexible elements of a spacecraft (solar wings, antennas, booms). On account of this, in the last decades many researchers have developed different strategies to effectively damp the elastic vibrations by means of active vibration devices (such as piezo-electric patches) or by means of robust control algorithms. The approach suggested in this paper is different, since neither additional devices nor complex control laws are introduced. In fact, the complete model of the system (including rigid, elastic and orbital dynamics, coupled with control actions) is controlled by the non-linear attitude controller named state dependent Riccati equation, which will be based on a simplified version of the spacecraft model. The task to reduce the mutual interaction between rigid attitude and flexible dynamics is entirely transferred to a modification of the desired trajectory that must be tracked. This command shaping technique is based on the knowledge of the parameters (inertial and elastics) of the VLSS. Unfortunately these parameters are not always exactly known and, however, they may change over the time. On account of this a Monte Carlo analysis has been also performed, showing the robustness of the proposed control strategy to the structural uncertainties. The numerical simulations prove that this strategy, based on the joint application of two well-known yet simple techniques, produces accurate and robust results. • A very large space structure modeling is proposed. • A non-linear attitude controller via state dependent Riccati equation is described. • A smoothing technique on attitude control torques has been applied to reduce vibrations." @default.
• W2076554429 created "2016-06-24" @default.
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• W2076554429 date "2014-01-01" @default.
• W2076554429 modified "2023-10-16" @default.
• W2076554429 title "Very large space structures: Non-linear control and robustness to structural uncertainties" @default.
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• W2076554429 doi "https://doi.org/10.1016/j.actaastro.2013.07.022" @default.
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