Robust feedback design for nonlinear systems: A survey

A survey is conducted regarding the need for robust feedback design for nonlinear systems. A key central problem in control theory is the design of feedback controllers so as to have certain outputs of a given plant to track prescribed reference trajectories. This control goal has to be achieved in spite of a good number of phenomena that will cause the system to behave differently from that expected in any realistic scenario. The problem has been found to cover a large number of major problems in feedback design. A problem of significant importance in analysis and design of feedback systems is the problem of determining the asymptotic properties of a system consisting of the interconnection of several parts, knowing the asymptotic properties of each individual component.