Percorrer por autor "Silva, Diogo Melo e"
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- Optimal Positioning of the Actuators of a Satellite in Low Earth OrbitsPublication . Silva, Diogo Melo e; Bousson, Kouamana; Cruz, Pedro Filipe Neves Ferreira Lobão daThis dissertation focuses on optimizing the configuration of reaction wheels for satellite attitude control in a sun-synchronous orbit. The control of a satellite in low Earth orbit is crucial throughout the mission period of an Earth observation satellite. Reaction wheels are essential for executing precise attitude maneuvers in space, but their energy consumption must be minimized to extend mission life. The proposed approach involves simulating a full orbital period, considering key orbital disturbances such as atmospheric drag, J2, and solar radiation pressure. During this period, a series of attitude maneuvers is performed using control strategies based on Linear Quadratic Regulator controllers. The energy consumed by the reaction wheels for these maneuvers is calculated, approximately. Subsequently, the proposed approach is to carry out simulations, using a genetic algorithm, by varying the number, orientation, and position of the reaction wheels, with the objective of minimizing energy consumption while respecting the time constraints required to perform the maneuvers defined in the reference concept of operations. The outcome of this work provides an efficient reaction wheel configuration that balances energy usage and performance, contributing to more sustainable and efficient satellite missions in low Earth orbit. Similarly, the mission development and design phase is optimized, as this approach provides greater flexibility and accelerates the analysis and performance evaluation of attitude control systems during the early stages of the design process.