A unified approach for designing robust linear feedback controllers

Abstract A general approach for designing robust multivariable controllers is presented, which can be applied in the time and frequency domains for both continuous and discrete-time systems. The model uncertainties are dealt with by means of multi-input multi-output comparison systems in the sense of unknown-but-bounded uncertainties. On this basis important generalizations of the description of incompletely known original systems, and a general design philosophy for robust controllers are presented. These results show important methodical similarities of a variety of recently published design procedures, which prove to be specializations of this new approach.

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