

Sixth International Conference on Differential and Functional Differential Equations DFDE2011
August 16, 2011 17:30, Moscow






Monodromy operator approximation for periodic solutions of differentialdifference equations
N. B. Zhuravlev^{} ^{} Peoples' Friendship University of Russia, Moscow, Russia

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Abstract:
The following nonlinear equation with delay is considered:
\begin{equation}
x'(t)= f(x(t),x(t1)).
\tag{1}
\end{equation}
It is supposed that a periodic solution $\tilde x$ of this equation with period $T$ is known. The Floquet theory is known to be valid for Eq. [1], which permits to describe the behavior of the solutions in the field the of periodical solution $\tilde x$ in terms of monodromy operator eigenvalues associated with the $\tilde x$ solution.
Unlike the case of ordinary differential equations, yet there is no a universal efficient method to find Floquet multipliers for the casual Eq. (1) and solution $\tilde x$ (at least approximately). In [2–4], there are most sufficient results for such an approach. If the period is not commensurable with delay, then considerable difficulties arise. One of the ways to solve this problem is based on the approximation of an original problem
by means of a sequence of auxiliary problems. The problem of building of auxiliary model problems has not been solved yet and still there is no evaluation method to calculate the error within such an approach to the finding of Floquet multipliers.
A new way of approximation of the original problem is introduced in this paper. A number of examples are provided.
Language: English
References

Hale J.K., Theory of functional differential equations, Springer, New York, 1977

Skubachevskii A.L., Walther H.O., “On the Floquet multipliers of periodic solutions to nonlinear functional differential equations”, J. Dynam. Differential Equations, 18:2 (2006), 257–355

Zhuravlev N.B., “Hyperbolicity criterion for periodic solutions of functionaldifferential equations with several delays”, J. Math. Sci. (N. Y.), 153:5 (2007), 683–709

Sieber J., Szalai R., Characteristic matrices ror linear periodic delay differential equations, 25 May 2010, arXiv: 1005.4522v1 [math.DS]

