Incomplete approach to homoclinicity in a model with bent-slow manifold geometry

Details Incomplete approach to homoclinicity in a model with bent-slow manifold geometry Incomplete approach to homoclinicity in a model with bent-slow manifold geometry

2000-01-14

arxiv.org/abs/nlin/0001030v1

Nonlinear Sciences

Chaotic Dynamics

14 Figures(Postscript); To Appear in Physica D : Nonlinear Phenomena

Scientific paper

10.1016/S0167-2789(99)00241-9

The dynamics of a model, originally proposed for a type of instability in plastic flow, has been investigated in detail. The bifurcation portrait of the system in two physically relevant parameters exhibits a rich variety of dynamical behaviour, including period bubbling and period adding or Farey sequences. The complex bifurcation sequences, characterized by Mixed Mode Oscillations, exhibit partial features of Shilnikov and Gavrilov-Shilnikov scenario. Utilizing the fact that the model has disparate time scales of dynamics, we explain the origin of the relaxation oscillations using the geometrical structure of the bent-slow manifold. Based on a local analysis, we calculate the maximum number of small amplitude oscillations, $s$, in the periodic orbit of $L^s$ type, for a given value of the control parameter. This further leads to a scaling relation for the small amplitude oscillations. The incomplete approach to homoclinicity is shown to be a result of the finite rate of `softening' of the eigen values of the saddle focus fixed point. The latter is a consequence of the physically relevant constraint of the system which translates into the occurrence of back-to-back Hopf bifurcation.

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