Period-generated control: A space-spinoff technology (original) (raw)

AIP Conference Proceedings, 1992

Abstract

Period-generated control is a method for tracking trajectories that are defined in terms of a demanded rate. It entails computing the control signal needed to achieve a specified trajectory by first using a form of proportional-integral-derivative feedback to generate a demanded inverse period (a velocity) and then substituting that inverse period into a system model. Terms that represent accelerations are included in the model and provide corrective action against deviations from the specified path. A characteristic feature of period-generated control is that rapid adjustments of the control signal are needed whenever a change is made in the demanded trajectory. Advantages to the technique are that it is readily implemented, that it is applicable nonlinear systems, and that the resulting control laws may approach time-optimal behavior for the special case of rate-constrained processes. Period-generated control was developed for the automated operation of nuclear reactors and experiments have been performed to demonstrate its efficacy for that purpose. However, its potential is quite broad and examples are given of its use for the control of non-nuclear systems. In addition, the theory of period-generated control is presented together with an assessment of its major strengths.

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