A design procedure for the exact H siso‐robust performance problem

R. E. Nordgren, Matthew Franchek, O. D.I. Nwokah

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Presented in this paper is a loop-shaping solution to the H robust performance problem for a class of SISO systems. The key feature of this work is the explicit incorporation of phase information into the controller synthesis to facilitate loop-shaping over all frequencies. Consequently, a significant reduction in the required controller gain/bandwidth is achieved. It is also shown that the optimal solution, in the sense of controller gain/bandwidth minimization, to the robust performance problem is that which makes μ = 1 over all frequencies. This is different from the usual definition of optimality in the H/μ literature. An example is included for completeness.

Original languageEnglish (US)
Pages (from-to)107-118
Number of pages12
JournalInternational Journal of Robust and Nonlinear Control
Issue number2
StatePublished - Jan 1 1995


  • H
  • QFT
  • loop shaping
  • μ‐synthesis

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Chemical Engineering(all)
  • Biomedical Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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