Abstract
This paper presents a frequency-domain based input-output theory of multivariable low-gain Pl-control of infinite-dimensional stable systems. It is known that under very mild assumptions a large class of infinite-dimensional systems can be stabilized and regulated by multivariable Pl-controUers with sufficiently low gain. The controller design can be accomplished using plant step data only. No other knowledge of the plant is required. The application of the input-output results to distributed parameter systems and neutral systems is discussed.
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