Technical communique: A note on fractional-order derivatives of periodic functions

  • Authors:
  • Mohammad Saleh Tavazoei

  • Affiliations:
  • Electrical Engineering Department, Sharif University of Technology, Tehran, Iran

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 2010

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Abstract

In this paper, it is shown that the fractional-order derivatives of a periodic function with a specific period cannot be a periodic function with the same period. The fractional-order derivative considered here can be obtained based on each of the well-known definitions Grunwald-Letnikov definition, Riemann-Liouville definition and Caputo definition. This concluded point confirms the result of a recently published work proving the non-existence of periodic solutions in a class of fractional-order models. Also, based on this point it can be easily proved the absence of periodic responses in a wider class of fractional-order models. Finally, some examples are presented to show the applicability of the paper achievements in the solution analysis of fractional-order systems.