The robustness of a proximate time-optional controller [optional read optimal]

Two practical time-optimal controllers for rapid slewing of type-3 and type-2 third-order plants, PTOS3 and PTOS3/spl tau/, respectively, were previously proposed. In this paper, we present results showing that the PTOS3/spl tau/ is more robust than the corresponding time-optimal controller to both plant parameter variations and feasible unmodeled dynamics. In addition, a useful numerical method to calculate the time-optimal controls for general linear systems is presented. The results for the PTOS3 and the time-optimal controller for type-3 third-order plants are similar and thus are not detailed. >

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