An LMI-Based Algorithm for Designing Suboptimal Static $\cal H_2/\cal H_\infty$ Output Feedback Controllers

  • Authors:
  • F. Leibfritz

  • Affiliations:
  • -

  • Venue:
  • SIAM Journal on Control and Optimization
  • Year:
  • 2000

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Abstract

We consider the problem of designing a suboptimal ${\cal H}_2/{\cal H}_{\infty}$ feedback control law for a linear time-invariant control system when a complete set of state variables is not available. This problem can be necessarily restated as a nonconvex optimization problem with a bilinear, multiobjective functional under suitably chosen linear matrix inequality (LMI) constraints. To solve such a problem, we propose an LMI-based procedure which is a sequential linearization programming approach. The properties and the convergence of the algorithm are discussed in detail. Finally, several numerical examples for static ${\cal H}_2/{\cal H}_{\infty}$ output feedback problems demonstrate the applicability of the considered algorithm and also verify the theoretical results numerically.