Nyquist Envelope of Fractional Order Transfer Functions with Parametric Uncertainty

TAN N. , Ozyetkin M. M. , YEROĞLU C.

International Workshops on New Trends in Science and Technology (NTST 08)/ Fractional Differentiation and its Applications (FDA08), Ankara, Turkey, 01 November 2008, pp.487-494 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1007/978-90-481-3293-5_43
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.487-494


The paper presents a method for computation of the Nyquist envelope of fractional order interval control systems (FOICS). The given method is based on the computation of the value sets of fractional order interval polynomials (FOIP). The results obtained will be useful for estimating the frequency domain specifications such as robust gain and phase margins, and for designing robust controller for FOICS.