Resumo-Neste trabalho são discutidos os principais conceitos e requisitos utilizados durante o projeto da malha de controle de atitude de um veículo lançador a partir da análise da dinâmica simplificada do veículo. A análiseé dividida em duas partes, primeiramente o veículoé tratado como um corpo rígido e um controlador PIDé apresentado. Em seguida o veículoé considerado um corpo flexível e dois métodos de estabilização dos modos flexão (ganho ou por fase) são apresentados. Além disso, um sistema de controle de atitudeé projetado considerando os conceitos discutidos.
This communication presents a comparative analysis of tuning techniques for satellite launch vehicle attitude controllers. The investigated tuning techniques consist in the minimization of specific performance indexes, namely the Integral Absolute Error (IAE) index, the Integral of Time Multiplied Absolute Error (ITAE) index, the Integral Squared Error (ISE) index, and the Integral of Time Multiplied Squared Error (ITSE) index, being hence, termed optimal. By defining adequate figures of merit, relevant for evaluating the overall performance of satellite launch vehicles, and also taking into account requirements related to the physical limitations of the latter, the performance of attitude controllers tuned by the investigated techniques is compared to the one tuned by the methodology currently employed in the Brazilian Satellite Launch Vehicle (VLS), namely, the Linear Quadratic (LQ) methodology. Through simulation results, it is demonstrated that, despite sparse benefits produced by the alternative tuning techniques, in particular ITAE and ISE, the LQ methodology remains globally superior.
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