Numerical Construction of LISS Lyapunov Functions under a Small Gain Condition

Details Numerical Construction of LISS Lyapunov Functions under a Small Gain Condition Numerical Construction of LISS Lyapunov Functions under a Small Gain Condition

2011-05-10

arxiv.org/abs/1105.1922v3

Mathematics

Numerical Analysis

30 pages, 7 figures, 4 tables

Scientific paper

In the stability analysis of large-scale interconnected systems it is frequently desirable to be able to determine a decay point of the gain operator, i.e., a point whose image under the monotone operator is strictly smaller than the point itself. The set of such decay points plays a crucial role in checking, in a semi-global fashion, the local input-to-state stability of an interconnected system and in the numerical construction of a LISS Lyapunov function. We provide a homotopy algorithm that computes a decay point of a monotone op- erator. For this purpose we use a fixed point algorithm and provide a function whose fixed points correspond to decay points of the monotone operator. The advantage to an earlier algorithm is demonstrated. Furthermore an example is given which shows how to analyze a given perturbed interconnected system.

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