Abstract
The nonlinear differential equation governing the periodic motion of the one-dimensional, undamped, unforced cubic–quintic Duffing oscillator is solved exactly, providing exact expressions for the period and the solution. The period is given in terms of the complete elliptic integral of the first kind and the solution involves Jacobi elliptic functions. Some particular cases obtained varying the parameters that characterize this oscillator are presented and discussed. The behaviour of the period as a function of the initial amplitude is analysed, the exact solutions and velocities for several values of the initial amplitude are plotted, and the Fourier series expansions for the exact solutions are also obtained. All this allows us to conclude that the quintic term appearing in the cubic–quintic Duffing equation makes this nonlinear oscillator not only more complex but also more interesting to study.
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Acknowledgments
This work was supported by the “Generalitat Valenciana” of Spain, under Project PROMETEOII/2015/015, and by the “Vicerrectorado de Tecnologías de la Información” of the University of Alicante, Spain, under Project GITE-09006-UA.
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Beléndez, A., Beléndez, T., Martínez, F.J. et al. Exact solution for the unforced Duffing oscillator with cubic and quintic nonlinearities. Nonlinear Dyn 86, 1687–1700 (2016). https://doi.org/10.1007/s11071-016-2986-8
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DOI: https://doi.org/10.1007/s11071-016-2986-8