Modal testing of nonlinear vibrating structures based on nonlinear normal modes: Experimental demonstration

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Identification of nonlinear normal modes of engineering structures under broadband forcing (2016, background): “The frequency of this stepped-sine excitation is tuned until the force appropriation indicator derived from the generalized phase lag quadrature criterion is equal to 1 [32].”
Identification of backbone curves of nonlinear systems from resonance decay responses (2015, methodology): “The example model studied is taken from [18] and consists of two masses connected to ground and between themselves with a linear spring.”