Abstract
In this paper strongly nonlinear oscillator equations will be studied.It will be shown that the recently developed perturbation method based onintegrating factors can be used to approximate first integrals. Not onlyapproximations of first integrals will be given, butit will also be shown how in a rather efficient way the existence and stability oftime-periodic solutions can be obtained from these approximations. In particularthe generalized Rayleigh oscillator equation \(\ddot X + 9X + \mu X^2 + {\lambda }X^3 = \varepsilon (\dot X - \dot X^3 )\) will be studied in detail, and it will beshown that at least five limit cycles can occur.
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Waluya, S.B., van Horssen, W.T. On Approximations of First Integrals for Strongly Nonlinear Oscillators. Nonlinear Dynamics 32, 109–141 (2003). https://doi.org/10.1023/A:1024470410240
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DOI: https://doi.org/10.1023/A:1024470410240