Controle discreto da atitude de satelites artificiais com apendices flexiveis / Discrete-time attitude control of artificial satellites with flexible appendages




This work discusses and simulates the discrete-time control of artificial satellites with flexible appendages, and its stability in function of growing sampling periods. Due to mission needs the dimensions of the appendages tend to increase becoming more flexible. As a result, it is important to investigate the effects of digital characteristics such as sampling period, delays (in inputs, processing and outputs) and amplitude quantization on it. In this work only the sampling period effects are investigated. The discrete-time PD controller design is done considering aspects such as the aliasing and the hidden oscillations. The PD controller is tested with 2 plants: an harmonic oscillation, and a model of the China-Brazil Earth Resources Satellite - (CBERS-1), comparing the analog PD, with standard discrete-time PD obtained by classic s-z mappings (Tustin and Schneider) and by a new s-z mapping proposed in this work, using the same simulation conditions (control gains, etc.). The Jury stability criterion, root-loci, transient and steady state responses with those plants were used to analyze their performances. Some many stabilization methods were inferred. The new method has shown the best performance amongst the approaches tested.


mapeador de plano s para plano z satélites artificiais controle de atitude estruturas modos de vibração satélite sino-brasileiro de recursos terrestres engenharia e tecnologia espacial estabilidade cbers 1

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