Large deployable structures are required for the advancement of modern space activities. A wide variety of EO (Earth Observation) satellites are actually using and will profit by large antenna systems supported by truss-like structures with low mass and stiffness. A net of smart actuators can be embedded in the sup-porting frame elements to make the structure adaptive itself and to limit unde-sired elastic vibrations. In the present paper, the supporting structure of a very large mesh reflector is investigated. An optimization procedure has been carried out to evaluate the damping efficacy of the actuators. After having assessed the best authority of the devices belonging to the active net, a control strategy has been implemented to coordinate their simultaneous action. One of the most rele-vant issue to ensure a good performance of a spacecraft integrated control strat-egy is related to its robustness when some uncertainty parameters are considered at design stage. In addition, the properties of space modules may be affected by slight changes due to launch loads. The effects of the attitude control authority and its robustness to uncertainties on mechanical and elastic parameters of both passive structure and actuators have been analysed and discussed.

Uncertainty impact on micro-vibration control of an orbiting large adaptive space structure / Angeletti, Federica; Gasbarri, Paolo. - 170:(2020), pp. 709-728. (Intervento presentato al convegno First IAA/AAS SciTech Forum on space flight mechanics and space structures and materials tenutosi a Moscow; Russia) [10.29007/332j].

Uncertainty impact on micro-vibration control of an orbiting large adaptive space structure

Federica Angeletti;Paolo Gasbarri
2020

Abstract

Large deployable structures are required for the advancement of modern space activities. A wide variety of EO (Earth Observation) satellites are actually using and will profit by large antenna systems supported by truss-like structures with low mass and stiffness. A net of smart actuators can be embedded in the sup-porting frame elements to make the structure adaptive itself and to limit unde-sired elastic vibrations. In the present paper, the supporting structure of a very large mesh reflector is investigated. An optimization procedure has been carried out to evaluate the damping efficacy of the actuators. After having assessed the best authority of the devices belonging to the active net, a control strategy has been implemented to coordinate their simultaneous action. One of the most rele-vant issue to ensure a good performance of a spacecraft integrated control strat-egy is related to its robustness when some uncertainty parameters are considered at design stage. In addition, the properties of space modules may be affected by slight changes due to launch loads. The effects of the attitude control authority and its robustness to uncertainties on mechanical and elastic parameters of both passive structure and actuators have been analysed and discussed.
2020
First IAA/AAS SciTech Forum on space flight mechanics and space structures and materials
large space structures; microdynamics; vibration control
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Uncertainty impact on micro-vibration control of an orbiting large adaptive space structure / Angeletti, Federica; Gasbarri, Paolo. - 170:(2020), pp. 709-728. (Intervento presentato al convegno First IAA/AAS SciTech Forum on space flight mechanics and space structures and materials tenutosi a Moscow; Russia) [10.29007/332j].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1329545
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