H/sub /spl infin////spl mu/ DIA control of the magnetic suspension system

Abstract

This paper deals with H/sub /spl infin////spl mu/ DIA control of the magnetic suspension system. H/sub /spl infin// DIA control is an H/sub /spl infin// control problem which treats a mixed Disturbance and an Initial-state uncertainty Attenuation (DIA) and supplies H/sub /spl infin// controls with good transients. H/sub /spl infin// DIA controller has a good initial response property, however its robust performance might be improved. We propose H/sub /spl infin////spl mu/ DIA Control which is to find a multi-objective controller to achieve both the H/sub /spl infin// DIA condition for good initial responses/transient responses and the structured singular value /spl mu/ condition for robust performance. We apply this proposed approach to the magnetic suspension system, and design a robust controller which has both good properties. Finally experimental results show effectiveness of the proposed control system design framework.