Synthesis of fixed-architecture, robust H/sub 2/ and H/sub /spl infin// controllers

This paper discusses the synthesis of fixed-architecture controllers that guarantee either robust H/sub 2/ or H/sub /spl infin// performance. The synthesis is accomplished by solving a Riccati equation feasibility problem resulting from mixed structured singular value theory with Popov multipliers. It is seen that the numerical algorithm for robust H/sub /spl infin// performance is much more computationally intensive than that for robust H/sub 2/ performance. The results are illustrated by designing robust controllers for a benchmark problem.