H∞optimal sampled-data control in continuous time systems
作者:
GILEAD TADMOR,
期刊:
International Journal of Control
(Taylor Available online 1992)
卷期:
Volume 56,
issue 1
页码: 99-141
ISSN:0020-7179
年代: 1992
DOI:10.1080/00207179208934306
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We consider the design ofH∞optimal discrete-time (digital) controllers in continuous-time systems. An apparent difficulty, especially in utilizing moderntransform-domainanalysis in this context, stems from the absence of an appropriate (transfer function) model for the hybrid-time (discrete and continuous) closed-loop system. This difficulty is overcome through the introduction of an equivalent difference-equation model for the continuous-time system, with distributed inputs and outputs; equivalence being in the sense that the continuous-and discrete-time inputs and outputs are essentially identical. Using the interplay between the discrete and the continuous time models, solutions of the well-known purely continuous-time and purely discrete-time standard problems extend to solutions of the problem at hand. They comprise Riccati equation characterizations of feasible combinations of sampling rates and bounds on the closed-loop induced input-output norm, and parameterization of compensators. We consider a general setting that includes as particular instances both the case where the sensor's analog-to-digital (A/D) convertor and the control-hold (D/A) component are predetermined and cases where the design of either or both of these elements is part of the overall problem.
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