Limit cycles for continuous and discontinuous perturbations of uniform isochronous cubic centers

JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS

卷:277

Article

Llibre, Jaume¹  Itikawa, Jackson¹ 

[1] Univ Autonoma Barcelona, Dept Matemat, E-08193 Barcelona, Catalonia, Spain

关键词: Polynomial vector field;    Limit cycle;    Averaging method;    Periodic orbit;    Uniform isochronous center;   

DOI  :  10.1016/j.cam.2014.09.007

来源: Elsevier

【 摘 要 】

Let p be a uniform isochronous cubic polynomial center. We study the maximum number of small or medium limit cycles that bifurcate from p or from the periodic solutions surrounding p respectively, when they are perturbed, either inside the class of all continuous cubic polynomial differential systems, or inside the class of all discontinuous differential systems formed by two cubic differential systems separated by the straight line y = 0. In the case of continuous perturbations using the averaging theory of order 6 we show that the maximum number of small limit cycles that can appear in a Hopf bifurcation at p is 3, and this number can be reached. For a subfamily of these systems using the averaging theory of first order we prove that at most 3 medium limit cycles can bifurcate from the periodic solutions surrounding p, and this number can be reached. In the case of discontinuous perturbations using the averaging theory of order 6 we prove that the maximum number of small limit cycles that can appear in a Hopf bifurcation at p is 5, and this number can be reached. For a subfamily of these systems using the averaging method of first order we show that the maximum number of medium limit cycles that can bifurcate from the periodic solutions surrounding p is 7, and this number can be reached. We also provide all the first integrals and the phase portraits in the Poincare disc for the uniform isochronous cubic centers. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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