Abstract

QFT emphasizes that the major reason for using feedback in control is plant parameter and disturbance uncertainties. The parameter uncertainty is quantitatively expressed by a set P=(P) of possible plants and the quantitative formulation of system performance by a set of acceptable command-response functions A and of disturbance response functions Ad. This paper is devoted to the latter. The design problem is to find a compensator G(s) which guarantees that the actual disturbance transfer function Td is in Ad for all P in P.

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