Abstract
The existence of a common quadratic Lyapunov function (CQLF) for a switched linear system guarantees its global asymptotic stability. Even if progress in finding the conditions for the existence/non-existence of a CQLF is significant, especially in switched linear systems consisting of N second-order systems or two systems of order n, the general case of N systems of order n still remains open. In this article, a sufficient condition for the non-existence of a CQLF for N systems of order n is derived. Based on the condition, a new method for determining the non-existence of a CQLF, using particle swarm optimisation, was designed and is described. Examples illustrating the proposed method are introduced at the end of this article.
Acknowledgements
The work reported in this article has been supported by CONICYT-CHILE through grant FONDECYT No. 1090208, Programa de Financiamiento Basal ‘Centro de Tecnología para la Minería’ FB0809, and the Grant Agency of the Czech Republic under contract No. 103/12/2431 (P. Zagalak).