Bursting oscillations in Duffing's equation with slowly changing external forcing

Bursting oscillations with different waveforms can be observed in the forced Duffing's equation when the external forcing changes slowly. We present an analysis of bursting oscillations by considering the external forcing as a control parameter and studying its influence on the controlled Duffing's equation. Furthermore, the effects of forcing amplitude gamma and forcing frequency omega on bursting oscillations are investigated. The forcing amplitude plays an important role in the generation of bursting oscillations, that is, bursting oscillations may be created for gamma > 2 root 3/9, while if gamma < 2 root 3/9, they do not occur. On the other hand, the time interval between two adjacent spikes of bursting oscillations is dependent on the forcing frequency, which can be computed at Delta T = pi/omega. (C) 2011 Elsevier B.V. All rights reserved.