Robustness analysis using the /spl nu/ tool

The mixed /spl mu/ analysis enables one to study robust stability and performance of a controller in the presence of real parametric uncertainties and neglected dynamics. In spite of the NP-hard characteristic of the problem, it provides a new possible way to compute an interval for the structured singular value /spl mu/ using polynomial-time algorithms. Certain problems however naturally require the skewed /spl mu/ tool (i.e. the /spl nu/ tool) rather than the /spl mu/ tool. This paper proposes both mixed /spl nu/ upper and lower bounds.