Global stability analysis of birhythmicity in a self-sustained oscillator
Chaos, Vol. 20(1), 013114 (2010); doi:10.1063/1.3309014
Yamapi R., Filattrella G. and Aziz-Alaoui M.A.
Labo. of Applied Maths., EA 3821,
Le Havre University, France.
We analyze the global stability properties of birhythmicity in a self-sustained system with random excitations. The model is a multi-limit-cycle variation in the van der Pol oscillator introduced to analyze enzymatic substrate reactions in brain waves. We show that the two frequencies are strongly influenced by the nonlinear coefficients α and β. With a random excitation, such as a Gaussian white noise, the attractor’s global stability is measured by the mean escape time τ from one limit cycle. An effective activation energy barrier is obtained by the slope of the linear part of the variation in the escape time τ versus the inverse noise intensity 1/D. We find that the trapping barriers of the two frequencies can be very different, thus leaving the system on the same attractor for an overwhelming time. However, we also find that the system is nearly symmetric in a narrow range of the parameters.
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