Contributions to the model reduction problem

Research output: Contribution to journalArticle


A new method of model reduction is introduced based on the differentiation of polynomials. The reciprocals of the numerator and denominator polynomials of the high-order transfer function are differentiated suitably many times to yield the coefficients of the reduced order transfer function. An error analysis shows the accuracy of the method, and an eighth-order example illustrates it. The method is computationally very simple and is equally applicable to unstable and nonminimum phase systems.


  • Per-Olof Gutman
  • Carl Fredrik Mannerfelt
  • Per Molander
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Control Engineering
Original languageEnglish
Pages (from-to)454 - 455
JournalIEEE Transactions on Automatic Control
Issue number2
Publication statusPublished - 1982
Publication categoryResearch