Bifurcations and Sequences of Elements in Non-Smooth Systems Cycles

Ivan Arango, Fabio Pineda, Oscar Ruiz

Laboratorio de CAD/CAM/CAE, Universidad EAFIT, Medellin, Colombia.
Mechatronics and Machine Design Group, Universidad EAFIT, Medellin, Colombia.

DOI: 10.4236/ajcm.2013.33032                

Abstract

This article describes the implementation of a novel method for detection and continuation of bifurcations in non-smooth complex dynamic systems. The method is an alternative to existing ones for the follow-up of associated phenomena, precisely in the circumstances in which the traditional ones have limitations (simultaneous impact, Filippov and first derivative discontinuities and multiple discontinuous boundaries). The topology of cycles in non-smooth systems is determined by a group of ordered segments and points of different regions and their boundaries. In this article, we compare the limit cycles of non-smooth systems against the sequences of elements, in order to find patterns. To achieve this goal, a method was used, which characterizes and records the elements comprising the cycles in the order that they appear during the integration process. The characterization discriminates: a) types of points and segments; b) direction of sliding segments; and c) regions or discontinuity boundaries to which each element belongs. When a change takes place in the value of a parameter of a system, our comparison method is an alternative to determine topological changes and hence bifurcations and associated phenomena. This comparison has been tested in systems with discontinuities of three types: 1) impact; 2) Filippov and 3) first derivative discontinuities. By coding well-known cycles as sequences of elements, an initial comparison database was built. Our comparison method offers a convenient approach for large systems with more than two regions and more than two sliding segments.

Keywords

Bifurcation Sequences; Non-Smooth Systems; Limit Cycles; Dynamic Systems

Conflicts of Interest

The authors declare no conflicts of interest.

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