Abstract
Bifurcations and the structure of limit sets are studied for a three-dimensional van der Pol-Duffing system with a cubic nonlinearity. On a base of both computer simulations and theoretical results a model map is proposed which allows one to follow the evolution in the phase space from a simple (Morse-Smale) structure to chaos. It is established that appearance of complex, multistructural set of double-scroll type is stipulated by the presence of a heteroclinic orbit of intersection of the unstable manifold of a saddle periodic orbit and stable manifold of an equilibrium state of saddle-focus type.
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