Abstract
A new range of techniques is introduced for the purpose of exploiting information about the structure of the perturbation associated with uncertain linear multi-variable feedback systems. The class of perturbation considered is wide and ignores only the phase information of the individual elements of the perturbation matrix; it encompasses diagonal, block-diagonal and other forms of block-structured perturbations. The techniques developed provide a means of assessing stability margins and also lead to an extension of the Nyquist criterion.
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