Journal
AUTOMATICA
Volume 50, Issue 2, Pages 547-551Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.automatica.2013.11.018
Keywords
Equilibria; Fractional-order nonlinear system; Finite-time stability; Linear Lyapunov function
Funding
- GRF HKU [7138/10E]
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We note that in the literature it is often taken for granted that for fractional-order system without delays, whenever the system trajectory reaches the equilibrium, it will stay there. In fact, this is the well-known phenomenon of finite-time stability. However, in this paper, we will prove that for fractional-order nonlinear system described by Caputo's or Riemann-Liouville's definition, any equilibrium cannot be finite-time stable as long as the continuous solution corresponding to the initial value problem globally exists. In addition, some examples of stability analysis are revisited and linear Lyapunov function is used to prove the asymptotic stability of positive fractional-order nonlinear systems. (C) 2013 Elsevier Ltd. All rights reserved.
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