By means of qualitative numerical analysis methods, we study periodic pendulum motion described by a nonlinear nonautonomous three-parametric differential equation under the influence of a periodic moment. In the restricted range of the parameter space that represents the greatest interest, the stability diagrams for periodic rotations are built. Bifurcations leading to their excitation and changing the nature of stability are found. Existence domains of 2?- and 4?-periodic steady-state regimes are obtained.
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