Identification of the stability of feedback systems in the presence of nonlinear distortions

J. Schoukens, R. Pintelon, T. Dobrowiecki

Research output: Contribution to journalConference article

5 Citations (Scopus)


A criterion to verify experimentally the stability of a nonlinear system, captured in a feedback loop, is proposed. The basic idea is to split the output power in coherent (linearly related to the input) and noncoherent power (the remaining power). A nonlinear power gain, measuring the sensitivity of the noncoherent power to input variations, is introduced. Using the small gain theorem, it is possible to check the local stability of the feedback for the actual class of excitation signals.

Original languageEnglish
Pages (from-to)139-144
Number of pages6
JournalIFAC Proceedings Volumes (IFAC-PapersOnline)
Issue number1
Publication statusPublished - Jan 1 2002
Event15th World Congress of the International Federation of Automatic Control, 2002 - Barcelona, Spain
Duration: Jul 21 2002Jul 26 2002



  • Identification
  • Nonlinear distortion
  • Stability tests

ASJC Scopus subject areas

  • Control and Systems Engineering

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