Expansion of Robust Stabilization Using Phase Information

Expansion for the System Having Uncertain Relative Degree

Abstract

The purpose of this paper is to expand the result a of robust stability condition using phase information by Yamada. That is, recent paper can not deal with the set of the system that the number of relative degree of the nominal plant is not equal to that of the real plant. We define a class of uncertainty to include the system that the number of relative degree of the nominal plant is not equal to that of the real plant. A necessary and sufficient robust stability condition for the system with a certain class of uncertainty is presented.