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In this paper, we study a special case of the robust performance problem studied in the companion paper (4). When the weightings used to describe the uncertainty and performance specifications vary only with frequency, then it is possible to strengthen the results in that paper by deriving both upper and lower bounds upon the structured singular value. Both sets of bounds are stated in terms of the...
The purpose of this short paper is to apply an approximation to the structured singular value, derived in [8], to analyze robustness difficulties associated with an illconditioned plant discussed in [9].
The purpose of this paper is to investigate the relation between feedback properties at the input and output of a multivariable plant. These properties may differ significantly at frequencies for which the plant transfer function has a high condition number. Furthermore, properties at one point may be relatively insensitive to uncertainty at that point, yet be extremely sensitive to uncertainty at...
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