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Robustness of Velocity Feedback Controllers for Flexible Spacecraft
Authors:Joshi  SM
Institution:NASA Langley Research Center;
Abstract:The robustness properties of collocated velocity feedback controllers used for damping enhancement in large, flexible space structures are investigated. It is proved that the closed-loop system using such controllers is asymptotically stable in the large when: 1) unmodeled linear time-invariant dynamics (such as sensors/actuators) are present, provided that the phase angle of such dynamics is between -90° and 90°, 2) time-varying or invariant nonlinearities lying in the first and the third quadrant (i. e., belonging to the (0, ?) sector) are present, or 3) sector-type nonlinearities following first-order stable dynamics are present in the feedback loop.
Keywords:
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