Stability of a nonlinear oscillator with random damping

Details Stability of a nonlinear oscillator with random damping Stability of a nonlinear oscillator with random damping

2005-10-24

arxiv.org/abs/nlin/0510063v1

European Physical Journal B 49 (2006) 453

Nonlinear Sciences

Chaotic Dynamics

Scientific paper

10.1140/epjb/e2006-00089-9

A noisy damping parameter in the equation of motion of a nonlinear oscillator renders the fixed point of the system unstable when the amplitude of the noise is sufficiently large. However, the stability diagram of the system can not be predicted from the analysis of the moments of the linearized equation. In the case of a white noise, an exact formula for the Lyapunov exponent of the system is derived. We then calculate the critical damping for which the {\em nonlinear} system becomes unstable. We also characterize the intermittent structure of the bifurcated state above threshold and address the effect of temporal correlations of the noise by considering an Ornstein-Uhlenbeck noise.

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