A fundamentally novel design approach that defies separation principle

Abstract

Abstract Separation principle has governed state space control design for decades. Under it the state feedback (SF) control design is separated from its realizing controller, and assumes the plant state is available even though it isn't. Hence for most plants, the critical loop transfer function and robustness property of SF control cannot be realized. This paper presents a general, complete and systematic design approach whose SF control is designed based on its realizing controller. This new design can fully realize the loop transfer function of its SF control for most plants. Although our SF control is constrained by its realizing controller, this constraint is minimized and unifies completely (under the common ground of loop transfer function realization) the SF control and static output feedback control.