Periodic solutions of forced isochronous oscillators at resonance
Author(s) -
Denis Bonheure,
C. Fabry,
Didier Smets
Publication year - 2002
Publication title -
discrete and continuous dynamical systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 70
eISSN - 1553-5231
pISSN - 1078-0947
DOI - 10.3934/dcds.2002.8.907
Subject(s) - singularity , multiplicity (mathematics) , physics , perturbation (astronomy) , nonlinear system , resonance (particle physics) , mathematical analysis , singularity theory , mathematics , quantum mechanics
We study the existence of 2pi-periodic solutions for forced nonlinear oscillators at resonance, the nonlinearity being a bounded perturbation of a function deriving from an isochronous potential, i.e. a potential leading to free oscillations that all have the same period. The family of isochronous oscillators considered here includes oscillators with jumping nonlinearities, as well as oscillators with a repulsive singularity, to which a particular attention is paid. The existence results contain, as particular cases, conditions of Landesman-Lazer type. Even in the case of perturbed linear oscillators, they improve earlier results. Multiplicity and non-existence results are also given
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