Journal
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
Volume 54, Issue 8, Pages 1986-1991Publisher
SCIENCE PRESS
DOI: 10.1007/s11431-011-4471-4
Keywords
global bifurcation; strongly nonlinear; chaos; Melnikov method
Funding
- National Natural Science Foundation of China [10872141, 11072168]
- National Hi-Tech Research and Development Program of China (863 Project) [2008AA042406]
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The global bifurcation of strongly nonlinear oscillator induced by parametric and external excitation is researched. It is known that the parametric and external excitation may induce additional saddle states, and result in chaos in the phase space, which cannot be detected by applying the Melnikov method directly. A feasible solution for this problem is the combination of the averaged equations and Melnikov method. Therefore, we consider the averaged equations of the system subject to Duffing-Van der Pol strong nonlinearity by introducing the undetermined fundamental frequency. Then the bifurcation values of homoclinic structure formation are detected through the combined application of the new averaged equations with Melnikov integration. Finally, the explicit application shows the analytical conditions coincide with the results of numerical simulation even disturbing parameter is of arbitrary magnitude.
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