Abstract
This study is concerned with a double pendulum and its regular behaviour associated with low energy levels and the influence of the associated initial conditions on the frequency of normal modes. The case of nonlinear oscillations described by the exact equations of motion is examined. A global qualitative insight is provided via energy diagrams and Poincaré maps. Then, the case of linear oscillations, their normal modes and associated frequencies is analysed. Further, quantitative insights via two approaches (Lindstedt–Poincaré method and harmonic balancing) are also achieved to determine analytically the influence of initial amplitudes on the existence and frequency of nonlinear normal modes. These results are compared with the one corresponding to the linear normal modes as well as with the corresponding numerical solutions of the exact equations of motion.
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References
Nayfeh, A.H., Mook, D.T.: Nonlinear Oscillations. Wiley, New York (1979)
Kovacic, I., Rand, R.H.: About a class of nonlinear oscillators with amplitude-independent frequency. Nonlinear Dyn. 74, 455–465 (2013)
Poschel, J.: A lecture on the classical KAM theorem. Proc. Symp. Pure Math. 69, 707–732 (2001)
Richter, P.H., Scholz, H.J.: Chaos in classical mechanics: the double pendulum. In: Schuster, P. (ed.) Stochastic Phenomena and Chaotic Behaviour in Complex Systems. Springer Series in Synergetics, vol. 21, pp. 86–97. Springer, Berlin (1984)
Shinbrot, T., Grebogi, C., Wisdom, J., Yorke, J.A.: Chaos in a double pendulum. Am. J. Phys. 60, 491–499 (1992)
Levien, R.B., Tan, S.M.: Double pendulum: an experiment in chaos. Am. J. Phys. 61, 1038–1044 (1993)
Stachowiak, T., Okada, T.: A numerical analysis of chaos in the double pendulum. Chaos Solitons Fract. 29, 417–422 (2006)
Rafat, M.Z., Wheatland, M.S., Bedding, T.R.: Dynamics of a double pendulum with distributed mass. Am. J. Phys. 77, 216–223 (2009)
Jyotirmoy, R., Mallik, A.K., Bhattacharjee, J.K.: Role of initial conditions in the dynamics of a double pendulum at low energies. Nonlinear Dyn. 73, 993–1004 (2013)
Kovacic, I., Radomirovic, D.: Mechanical Vibrations: Fundamentals with Solved Examples. Willey, London (2017)
Rosenberg, R.: The normal modes of nonlinear n-degree-of-freedom systems. J. Appl. Mech. 2, 7–14 (1962)
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The authors acknowledge support of the Ministry of Education and Science of Serbia, Grant III41007.
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Kovacic, I., Zukovic, M. & Radomirovic, D. Normal modes of a double pendulum at low energy levels. Nonlinear Dyn 99, 1893–1908 (2020). https://doi.org/10.1007/s11071-019-05424-5
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DOI: https://doi.org/10.1007/s11071-019-05424-5