1 Department of Physics, Technical University of Denmark2 Russian Academy of Sciences3 Saratov State Technical University4 Saratov State Technical University
Considering a family of three-dimensional oscillators originating in the field of radio-engineering, the paper describes three different mechanisms of torus formation. Particular emphasis is paid to a process in which a saddle-node bifurcation eliminates a stable cycle and leaves the system to find a stationary state between a saddle cycle and a pair of equilibrium points of unstable focus/stable node and unstable node/stable focus type.
European Physical Journal. Special Topics, 2013, Vol 222, Issue 10, p. 2391-2398