DISSIPATIVE H2 H-INFINITY CONTROLLER SYNTHESIS/

In certain applications, such as the colocated control of flexible str uctures, the plant is known to be positive real. Hence, closed-loop st ability is unconditionally guaranteed as long as the controller is als o positive real. One approach to designing positive real controllers i s the LQG-based positive real synthesis technique of Lozano-Leal and J oshi. The contribution of this paper is the extension of this positive real synthesis technique to include an H(infinity)-norm constraint on closed-loop performance.