State-space solutions to the h_inf/ltr design problem

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Abstract

The LTR design problem using an JC optimality criterion is presented for two types of recovery errors, the sensitivity recovery error and the input-output recovery error. For both errors two different approaches are presented. First, following the classical LTR design philosophy, a Luenberger observer
based approach is proposed, where the Z part of the controller is appended to a standard full-order observer. Second, allowing for general controllers, an JC state-space problem is formulated directly from the recovery errors. Both approaches lead to controller orders of at most 2n. In the minimum phase case,
though, the order of the controllers can be reduced to n in all cases. The control problems corresponding to the various controller types are given as four different singular state-space problems, and the solutions are given in terms of the relevant equations and inequalities
Original languageEnglish
JournalInternational Journal of Robust and Nonlinear Control
Volume3
Pages (from-to)1-45
ISSN1049-8923
Publication statusPublished - 1993

Keywords

  • Loop transfer recovery
  • Singular 25% theory
  • Luenberger observer
  • Youla parameterization

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