Digital redesign of an optimal momentum management controller for the Space Station
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Sunkel, J. W.↗
Engineering topics
Zhang, J. L.
Publications and source records attributed to Zhang, J. L..
Optimal digital redesign of cascaded analogue controllers
This paper presents a new, optimal digital redesign technique for finding an optimal cascaded digital controller from the given continuous-time counterpart by minimizing a quadratic performance index. The control gains can be obtained by solving a set of Liapunov equations. The developed optimal cascaded digital controller enables the state and/or outputs of the digitally controlled closed-loop sampled-data system to optimally match those of the original continuous-time closed-loop system at any instant between sampling periods. The developed control law can be implemented using inexpensive and reliable digital electronics with a relatively long sampling period.
Shieh, L. S.↗
Pseudo-continuous-time quadratic regulators with pole placement in a specific region
The paper comments on the pseudo-continuous-time quadratic regulator developed in an earlier paper. It also presents a new digital redesign technique, based on matching all the states at all the sampling instants, for finding the pseudo-continuous-time quadratic regulator.
Shieh, L. S.↗