Abstract :
[en] Besides the well-known primary resonances, forced nonlinear systems can exhibit secondary (namely superharmonic, subharmonic and ultrasubharmonic) resonances whose frequencies are rationally related to the forcing frequency. Some of these secondary resonances can appear as isolated branches of solutions, challenging their characterization. This work leverages two-harmonic forcing to transition from a primary resonance to a specific secondary resonance. A homotopy problem is formulated, whose limit cases correspond to these resonances. The proposed method is shown to be able to uncover isolated responses in a deterministic and reliable way. It is illustrated on a Duffing oscillator, a two-degree-of-freedom system and a beam with contact.
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