Robust stability of an interval plant with respect to a convex region in the complex plane

1993 ◽  
Vol 38 (2) ◽  
pp. 284-287 ◽  
Author(s):  
J. Shaw ◽  
S. Jayasuriya
Keyword(s):  
Robust Stability ◽  
Complex Plane ◽  
Convex Region

scholarly journals Robust stability of a class of uncertain fractional order linear systems with pure delay

2015 ◽  
Vol 25 (2) ◽  
pp. 177-187 ◽  
Author(s):  
Mikołaj Busłowicz ◽  
Andrzej Ruszewski
Keyword(s):  
Linear Systems ◽  
Fractional Order ◽  
Robust Stability ◽  
Complex Plane ◽  
Stability Region ◽  
The State ◽  
Interval Matrix ◽  
State Matrix ◽  
Order Linear ◽  
Pure Delay

Abstract The paper considers the robust stability problem of uncertain continuous-time fractional order linear systems with pure delay in the following two cases: a) the state matrix is a linear convex combination of two known constant matrices, b) the state matrix is an interval matrix. It is shown that the system is robustly stable if and only if all the eigenvalues of the state matrix multiplied by delay in power equal to fractional order are located in the open stability region in the complex plane. Parametric description of boundary of this region is derived. In the case a) the necessary and sufficient computational condition for robust stability is established. This condition is given in terms of eigenvalue-loci of the state matrix, fractional order and time delay. In the case b) the method for determining the rectangle with sides parallel to the axes of the complex plane in which all the eigenvalues of interval matrix are located is given and the sufficient condition for robust stability is proposed. This condition is satisfied if the rectangle multiplied by delay in power equal to fractional order lie in the stability region. The considerations are illustrated by numerical examples.

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