Bifurcation sequences in the interaction of resonances in a model deriving from nonlinear rotordynamics: the zipper

G.H.M. van der Heijden

Using numerical continuation we show a new bifurcation scenario involving resonant periodic orbits in a parametrised four-dimensional autonomous system deriving from nonlinear rotordynamics. The scenario consists of a carefully orchestrated sequence of transcritical bifurcations in which branches of periodic solutions are exchanged. Collectively, the bifurcations resemble the action of a zipper. An underlying governing mechanism clearly exists but still has to be uncovered. For a range of parameter values the sequence of bifurcations forms a global connection between a \v{S}il'nikov bifurcation and (partial) mode-locking. The homoclinic bifurcation is introduced into the system by a Takens-Bogdanov bifurcation. The system also features an interaction between two chaotic Sil'nikov bifurcations.

Dynamics and Stability of Systems 15, 159-183 (2000)