Globally and locally attractive solutions for quasi-periodically forced systems

Details Globally and locally attractive solutions for quasi-periodically forced systems Globally and locally attractive solutions for quasi-periodically forced systems

2005-11-23

arxiv.org/abs/math/0511581v1

Mathematics

Dynamical Systems

20 pages, 6 figures

Scientific paper

We consider a class of differential equations, $\ddot x + \gamma \dot x + g(x) = f(\omega t)$, with $\omega \in {\bf R}^{d}$, describing one-dimensional dissipative systems subject to a periodic or quasi-periodic (Diophantine) forcing. We study existence and properties of the limit cycle described by the trajectory with the same quasi-periodicity as the forcing. For $g(x)=x^{2p+1}$, $p\in {\bf N}$, we show that, when the dissipation coefficient is large enough, there is only one limit cycle and that it is a global attractor. In the case of other forces, including $g(x)=x^{2p}$ (with $p=1$ describing the varactor equation), we find estimates for the basin of attraction of the limit cycle.

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