ABSTRACT
H∞ design a group of robust controller design methods based on the methodology of the Hardy space H∞ consisting of all complex-valued functions of complex variable that are analytic and bounded in the open right half-plane. The least bound that may be imposed on this function is its H∞ norm. Since the open right half-plane may be replaced by the imaginary axis jω, H∞ methods provide a direct generalization of the classical frequency domain approach to control system design.
