Ghost-vibrational resonance

Ghost-stochastic resonance is a noise-induced resonance at a fundamental frequency missing in the input signal. We investigate the effect of a high-frequency, instead of a noise, in a single Duffing oscillator driven by a multi-frequency signal F(t) = Sigma(n)(i=1)fi cos(omega(i) + Delta omega(0))t, omega(i) = (k + i - 1)omega(0), where k is an integer greater than or equal to two. We show the occurrence of a high-frequency induced resonance at the missing fundamental frequency omega(0). For the case of the two-frequency input signal, we obtain an analytical expression for the amplitude of the periodic component with the missing frequency. We present the influence of the number of forces n, the parameter k, the frequency omega(0) and the frequency shift Delta omega(0) on the response amplitude at the frequency omega(0). We also investigate the signal propagation in a network of unidirectionally coupled Duffing oscillators. Finally, we show the enhanced signal propagation in the coupled oscillators in absence of a high-frequency periodic force. (C) 2014 Elsevier B.V. All rights reserved.