Abstract
The aim of this article is twofold. Firstly, we study the existence of limit cycles in a family of piecewise smooth vector fields corresponding to an unfolding of an invisible fold–fold singularity. More precisely, given a positive integer k, we prove that this family has exactly k hyperbolic crossing limit cycles in a suitable neighborhood of this singularity. Secondly, we provide a complete study relating the existence and stability of these crossing limit cycles with the limit cycles of the family of smooth vector fields obtained by the regularization method. This relationship is obtained by studying the equivalence between the signs of the Lyapunov coefficients of the family of piecewise smooth vector fields and the ones of its regularization.
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Funding
The first, second, and fourth authors are partially supported by Fundação de Amparo à Pesquisa do Estado de Minas Gerais – FAPEMIG [grant number APQ–01158–17]. The third author was financed in part by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – CAPES [Finance Code 001].
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de Carvalho Braga, D., Fernandes da Fonseca, A., Gonçalves, L.F. et al. Limit Cycles Bifurcating from an Invisible Fold–Fold in Planar Piecewise Hamiltonian Systems. J Dyn Control Syst 27, 179–204 (2021). https://doi.org/10.1007/s10883-020-09478-2
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DOI: https://doi.org/10.1007/s10883-020-09478-2
Keywords
- Piecewise smooth vector field
- Fold–fold singularity
- Bifurcation
- Limit cycle
- Regularization
- Hamiltonian vector field