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Bandwidth of the amplitude-frequency spectrum under forced nonlinear vibration of a buckled ribbon for a wide range of static deflection amplitude (A(0)/h) and amplitude (Aext/h) of external loading: (a) schematic illustration of the FEA model and the definition of the bandwidth; (b–e) frequency spectrum of the vibration amplitude for A(0)/h = 2.5, 2.5, 6.0 and 80, respectively; (f) bandwidth as a function of Aext/h for five different A(0)/h (1.5, 2.5, 6.0, 20 and 80).
