The agility of satellites equipped with large and flexible structures, such as solar panels or antennas, poses a significant challenge due to the influence of elastic dynamics on attitude motion. This results in reduced pointing accuracy and dimensional stability of the payload. To address this issue, an Active Collocated Attitude Control (ACAC) system has been developed, utilizing actuators for both the elastic dynamics (distributed piezoelectric devices) and attitude control (ON-OFF thrusters). In the initial phase of the project, the algorithm underwent extensive verification using a high-fidelity numerical model of a spacecraft with two very-low frequency flexible solar panels and a payload consisting of two long booms and a transversal antenna's reflector. The paper's primary focus, the second phase of the project, revolves around the experimental verification of the control architecture concept. To achieve this, a scaling procedure employing the dynamic analogy approach was implemented to determine the design parameters of a free-floating platform equipped with elastic appendages. This ensured that the resulting elastic multibody system displayed similar dynamic behavior to the full-scale satellite. Based on the scaling parameters, a test rig was manufactured, and actuators and sensors were optimally positioned. The performance of the ACAC system was then compared to that of traditional benchmark controllers. The results show that the ACAC system demonstrates superior capabilities in performing fast slew maneuvers without developing unstable interactions with the elastic dynamics.

Scaling, Manufacturing and Operations of a Free-floating Platform for the On-ground Testing of Robust Collocated Control for a Large Flexible Satellite / Sabatini, M.; Iannelli, P.; Gasbarri, P.; Palmerini, G. B.; Angeletti, F.; Ankersen, F.. - 2023-:(2023), pp. 1-16. (Intervento presentato al convegno 74th International Astronautical Congress, IAC 2023 tenutosi a aze).

Scaling, Manufacturing and Operations of a Free-floating Platform for the On-ground Testing of Robust Collocated Control for a Large Flexible Satellite

Sabatini M.;Iannelli P.;Gasbarri P.;Palmerini G. B.;Angeletti F.;
2023

Abstract

The agility of satellites equipped with large and flexible structures, such as solar panels or antennas, poses a significant challenge due to the influence of elastic dynamics on attitude motion. This results in reduced pointing accuracy and dimensional stability of the payload. To address this issue, an Active Collocated Attitude Control (ACAC) system has been developed, utilizing actuators for both the elastic dynamics (distributed piezoelectric devices) and attitude control (ON-OFF thrusters). In the initial phase of the project, the algorithm underwent extensive verification using a high-fidelity numerical model of a spacecraft with two very-low frequency flexible solar panels and a payload consisting of two long booms and a transversal antenna's reflector. The paper's primary focus, the second phase of the project, revolves around the experimental verification of the control architecture concept. To achieve this, a scaling procedure employing the dynamic analogy approach was implemented to determine the design parameters of a free-floating platform equipped with elastic appendages. This ensured that the resulting elastic multibody system displayed similar dynamic behavior to the full-scale satellite. Based on the scaling parameters, a test rig was manufactured, and actuators and sensors were optimally positioned. The performance of the ACAC system was then compared to that of traditional benchmark controllers. The results show that the ACAC system demonstrates superior capabilities in performing fast slew maneuvers without developing unstable interactions with the elastic dynamics.
2023
74th International Astronautical Congress, IAC 2023
free-floating platform test rig; large flexible spacecraft; piezoelectric actuators; robust collocated control; scaling procedure
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Scaling, Manufacturing and Operations of a Free-floating Platform for the On-ground Testing of Robust Collocated Control for a Large Flexible Satellite / Sabatini, M.; Iannelli, P.; Gasbarri, P.; Palmerini, G. B.; Angeletti, F.; Ankersen, F.. - 2023-:(2023), pp. 1-16. (Intervento presentato al convegno 74th International Astronautical Congress, IAC 2023 tenutosi a aze).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1707542
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