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Analysis of the pointwise completeness and the pointwise degeneracy of the standard and fractional descriptor linear systems and electrical circuits

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EN
The Drazin inverse of matrices is applied to analysis of the pointwise completeness and the pointwise degeneracy of the descriptor standard and fractional linear continuous-time and discrete-time systems. It is shown that: 1) The descriptor linear continuous-time system is pointwise complete if and only if the initial and final states belong to the same subspace. 2) The descriptor linear discrete-time system is not pointwise complete if its system matrix is singular. 3) System obtained by discretization of continuous-time system is always not pointwise complete. 4) The descriptor linear continuous-time system is not pointwise degenerated in any nonzero direction for all nonzero initial conditions. 5) The descriptor fractional system is pointwise complete if the matrix defined by (36) is invertible. 6) The descriptor fractional system is pointwise degenerated if and only if the condition (41) is satisfied. Considerations are illustrated by examples of descriptor linear electrical circuits.
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Twórcy
  • Bialystok University of Technology, Faculty of Electrical Engineering, Wiejska 45D, 15-351 Białystok, Poland
Bibliografia
  • [1] Busłowicz M., Pointwise completeness and pointwise degeneracy of linear discrete-time systems of fractional order. Zeszyty Naukowe Pol. Sląskiej, Automatyka, no. 151, 2008, pp. 19-24.
  • [2] Busłowicz M., Kociszewski R., Trzasko W., Pointwise completeness and pointwise degeneracy of positive discrete-time systems with delays. Zeszyty Naukowe Pol. Sląskiej, Automatyka, no. 151, 2008, pp. 55-56.
  • [3] Choundhury A.K., Necessary and sufficient conditions of pointwise completeness of linear time-invariant delay-differential systems. Int. J. Control, vol. 16, no. 6, 1972, pp. 1083-1100.
  • [4] Kaczorek T., Pointwise completeness and pointwise degeneracy of standard and positive hydrid linear systems described by the general model. Archives of Control Sciences, vol. 2, 2010, pp. 121-131.
  • [5] Kaczorek T., Pointwise completeness and pointwise degeneracy of standard and positive linear systems with state-feedbacks. Journal of Automation,Mobile Robotics and Ingelligent Systems, vol. 4, no. 1, 2010, pp. 3-7.
  • [6] Kaczorek T., Selected Problems of Fractional Systems Theory, Springer,Berlin 2011.
  • [7] Kaczorek T. and Busłowicz M., Pointwise completeness and pointwise degeneracy of linear continuous-time fractional order systems, Journal of Automation, Mobile Robotics and Intelligent Systems, vol. 3, no. 1, 2009, pp. 8-11.
  • [8] Kaczorek T. and Rogowski K., Fractional Linear Systems and Electrical Circuits, Springer 2015.
  • [9] Kilbas A.A., Srivastava H.M.,Trujilio J.J. Theory on Applications of Fractional Differential Equations, Elsevier, Amsterdam 2006.
  • [10] Olbrot A., On degeneracy and related problems for linear constant time-lag systems, Ricerche di Automatica, vol. 3, no. 3, 1972, pp. 203-220.
  • [11] Podlubny I., Fractional Differential Equations, Academic Press, San Diego 1999
  • [12] Popov V.M., Pointwise degeneracy of linear time-invariant delay-differential equations, Journal of Differential Equation, vol. 11, 1972, pp. 541-561.
  • [13] Trzasko W., Busłowicz M. and Kaczorek T., Pointwise completeness of discrete-time cone- systems with delays. Int. Proc. EUROCON 2007, Warsaw, pp. 606-611.
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Bibliografia
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