Replicate periodic windows in the parameter space of driven oscillators

• Published in: Chaos, solitons and fractals solitons and fractals, 2011-11, Vol.44 (11), p.982-989
• Main Authors: Medeiros, E.S., de Souza, S.L.T., Medrano-T, R.O., Caldas, I.L.
• Format: Article
• Language: English
• ISSN: 0960-0779; 1873-2887
• DOI: 10.1016/j.chaos.2011.08.002

► We apply a weak harmonic perturbation to control chaos in two driven oscillators. ► We find replicate periodic windows in the driven oscillator parameter space. ► We find that the periodic window replication is associated with the chaos control. In the bi-dimensional parameter space of driven oscillators, shrimp-shaped periodic windows are immersed in chaotic regions. For two of these oscillators, namely, Duffing and Josephson junction, we show that a weak harmonic perturbation replicates these periodic windows giving rise to parameter regions correspondent to periodic orbits. The new windows are composed of parameters whose periodic orbits have the same periodicity and pattern of stable and unstable periodic orbits already existent for the unperturbed oscillator. Moreover, these unstable periodic orbits are embedded in chaotic attractors in phase space regions where the new stable orbits are identified. Thus, the observed periodic window replication is an effective oscillator control process, once chaotic orbits are replaced by regular ones.