Abstract
A design approach is presented for feedback systems which are robustly stable and nominally optimal. This design approach is referred to as U-parameter design and represents a direct extension of Q-parameter design is used to design feedback systems that are only nominally stable. The free design function U(s) in the U-parameter theory is a bounded real or strongly bounded real function. The theory is applied to various nominal optimization problems, including H/sup 2/ and H/sup infinity / optimization and classical design specification optimization.

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