Pole placement in output feedback control systems for minimum sensitivity to plant parameter variations

Abstract

This paper considers extensions of the pole-placement algorithm of Sirisena and Choi (1975) to the design of output feedback control systems with minimum pole sensitivity to plant parameter changes. Two different design approaches are proposed. In one approach, exact pole placement is obtained at the nominal values of the parameters while minimizing a measure of the pole sensitivity to small parameter variations. The second approach yields optimal, though not exact, pole placement in a minimum mean square error sense over a (not necessarily small) prescribed range of parameter values. Illustrative numerical examples are included.