Analysis on Double Hopf Bifurcation Using Computer Algebra with the Aid of Multiple Scales

In this paper, a perturbation method based on multiple scales is used forcomputing the normal forms of nonlinear dynamical systems. The approach,without the application of center manifold theory, can be used to systematicallyfind the explicit normal form of a system described by a general n-dimensionaldifferential equation. The attention is focused on the dynamic behaviour ofa system near a critical point characterized by two pairs of purely imaginaryeigenvalues without resonance. The method can be easily formulated and implemented using a computer algebra system. Maple programs have been developedwhich can be `automatically' executed by a user without knowing computeralgebra. Examples chosen from mathematics, electrical circuits, mechanics andchemistry are presented to show the applicability of the technique and theconvenience of using computer algebra.