Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 3: Nonlinear dynamics, synchronization and chaos I

DY 3.2: Vortrag

Montag, 23. März 2009, 11:15–11:30, ZEU 118

Floquet stability analysis of Ott-Grebogi-Yorke and difference control — •Jens Christian Claussen — Neuro-und Bioinformatik, U zu Lübeck — Theoret. Phys. & Astrophys., CAU Kiel

For stabilization of instable periodic orbits of nonlinear dynamical systems two classes of methods exist: time-continuous control schemes based on Pyragas, and the two Poincaré-based chaos control schemes, Ott-Grebogi-Yorke (OGY) and difference control. Difference control [1] is a control scheme that is especially interesting for drifting parameter conditions [2]. In this contribution [3] a new stability analysis of these two Poincaré-based chaos control schemes is given by means of the Floquet theory. This approach allows to calculate exactly the stability restrictions occurring for small measurement delays and for an impulse length shorter than the length of the orbit. This is of practical experimental relevance; to avoid a selection of the relative impulse length by trial and error, it is advised to investigate whether the used control scheme itself shows systematic limitations on the choice of the impulse length. To investigate this point, a Floquet analysis is performed [3]. For OGY control the influence of the impulse length is marginal. As an unexpected result, difference control fails when the impulse length is taken longer than a maximal value that is approximately one half of the orbit length for small Ljapunov numbers and decreases with the Ljapunov number [3].
[1] S Bielawski D Derozier P Glorieux, Phys. Rev. A 47, 2492 (1993)
[2] JC Claussen T Mausbach A Piel HG Schuster, PRE 58, 7256 (1998)
[3] JC Claussen New Journal of Physics 10, 063006 (2008).