This article collects recent results concerning the behavior at resonance of forced oscillators driven by an asymmetric restoring force, with or without damping. This synthesis emphasizes the key role played by a function denoted by , which is, up to a sign reversal of its argument, a correlation product of the forcing term and of a function representing a free oscillation for theundamped equation. The theoretical results are accompanied by graphical representations illustrating the behavior of the damped and undamped oscillators. In particular, the damped oscillator is considered, with a forcing term whose frequency is close to the frequency of the free oscillations. For that problem, frequency-response curves are studied, both theoretically and through numerical computations, revealing a hysteresis phenomenon, when is of constant sign.
Submitted September 29, 2000. Published December 14, 2000.
Math Subject Classifications: 34C15, 34C25, 70K30.
Key Words: Resonance, frequency-response curves, jumping nonlinearity, Fucik spectrum.
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| Christian Fabry |
Universite Catholique de Louvain
Institut de Mathematique Pure et Appliquee,
Chemin du Cyclotron, 2 , B-1348 Louvain-la-Neuve, Belgium
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