This paper deals with robust performance and transient response of H∞/μ DIA control for magnetic suspension systems. H∞ DIA control is an H∞ control problem which treats a mixed disturbance and an initial-state uncertainty attenuation (DIA) and supplies H∞ controls with good transients. H∞ DIA controller has a good initial response property, however its robust performance might be improved. We propose H∞/μ DIA control which is to find a multi-objective controller to achieve both the H∞ DIA condition for good initial responses/transient responses and the structured singular value μ 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.
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