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Ukrainian Mathematical Journal

, Volume 67, Issue 4, pp 584–624 | Cite as

Differential Equations with Bistable Nonlinearity

  • A. M. Samoilenko
  • I. L. Nizhnik
Article

We study bounded solutions of differential equations with bistable nonlinearity by numerical and analytic methods. A simple mechanical model of circular pendulum with magnetic suspension in the upper equilibrium position is regarded as a bistable dynamical system simulating a supersensitive seismograph. We consider autonomous differential equations of the second and fourth orders with discontinuous piecewise linear and cubic nonlinearities. Bounded solutions with finitely many zeros, including solitonlike solutions with two zeros and kinklike solutions with several zeros are studied in detail. It is shown that, to within the sign and translation, the bounded solutions of the analyzed equations are uniquely determined by the integer numbers \( n=\left[\frac{d}{l}\right] \) where d is the distance between the roots of these solutions and l is a constant characterizing the intensity of nonlinearity. The existence of bounded chaotic solutions is established and the exact value of space entropy is found for periodic solutions.

Keywords

Periodic Solution Magnetic Suspension Chaotic Solution Discontinuous Nonlinearity Stable Stationary Solution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • A. M. Samoilenko
    • 1
  • I. L. Nizhnik
    • 1
  1. 1.Institute of MathematicsUkrainian National Academy of SciencesKyivUkraine

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