Robust performance and transient response of the H/sub /spl infin///spl mu/ DIA control for magnetic suspension systems

This paper deals with robust performance and transient response of H/sub /spl infin////spl mu/ DIA control for magnetic suspension systems. 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 magnetic suspension systems, and design a robust controller, which has both good properties. Finally simulation and experimental results show effectiveness of the proposed control system design framework.